chia-utils.js

(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        define([], factory);
    } else if (typeof module === 'object' && module.exports) {
        module.exports = factory();
    } else if(typeof window != "undefined") {
        window.ChiaUtils = factory();
    } else {
        root.returnExports = factory();
  }
}(typeof self !== 'undefined' ? self : this, function () {
    let needsCreateHash = false;
    let createHash;
    if(typeof window == "undefined") {
        try {
            createHash = (require("crypto")).createHash;
        } catch(err) {
            needsCreateHash = true;
        }
    } else {
        needsCreateHash = true;
    }
    if(needsCreateHash) {
        (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.createHash = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
            'use strict'

            exports.byteLength = byteLength
            exports.toByteArray = toByteArray
            exports.fromByteArray = fromByteArray

            var lookup = []
            var revLookup = []
            var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array

            var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
            for (var i = 0, len = code.length; i < len; ++i) {
              lookup[i] = code[i]
              revLookup[code.charCodeAt(i)] = i
            }

            // Support decoding URL-safe base64 strings, as Node.js does.
            // See: https://en.wikipedia.org/wiki/Base64#URL_applications
            revLookup['-'.charCodeAt(0)] = 62
            revLookup['_'.charCodeAt(0)] = 63

            function getLens (b64) {
              var len = b64.length

              if (len % 4 > 0) {
                throw new Error('Invalid string. Length must be a multiple of 4')
              }

              // Trim off extra bytes after placeholder bytes are found
              // See: https://github.com/beatgammit/base64-js/issues/42
              var validLen = b64.indexOf('=')
              if (validLen === -1) validLen = len

              var placeHoldersLen = validLen === len
                ? 0
                : 4 - (validLen % 4)

              return [validLen, placeHoldersLen]
            }

            // base64 is 4/3 + up to two characters of the original data
            function byteLength (b64) {
              var lens = getLens(b64)
              var validLen = lens[0]
              var placeHoldersLen = lens[1]
              return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
            }

            function _byteLength (b64, validLen, placeHoldersLen) {
              return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
            }

            function toByteArray (b64) {
              var tmp
              var lens = getLens(b64)
              var validLen = lens[0]
              var placeHoldersLen = lens[1]

              var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))

              var curByte = 0

              // if there are placeholders, only get up to the last complete 4 chars
              var len = placeHoldersLen > 0
                ? validLen - 4
                : validLen

              var i
              for (i = 0; i < len; i += 4) {
                tmp =
                  (revLookup[b64.charCodeAt(i)] << 18) |
                  (revLookup[b64.charCodeAt(i + 1)] << 12) |
                  (revLookup[b64.charCodeAt(i + 2)] << 6) |
                  revLookup[b64.charCodeAt(i + 3)]
                arr[curByte++] = (tmp >> 16) & 0xFF
                arr[curByte++] = (tmp >> 8) & 0xFF
                arr[curByte++] = tmp & 0xFF
              }

              if (placeHoldersLen === 2) {
                tmp =
                  (revLookup[b64.charCodeAt(i)] << 2) |
                  (revLookup[b64.charCodeAt(i + 1)] >> 4)
                arr[curByte++] = tmp & 0xFF
              }

              if (placeHoldersLen === 1) {
                tmp =
                  (revLookup[b64.charCodeAt(i)] << 10) |
                  (revLookup[b64.charCodeAt(i + 1)] << 4) |
                  (revLookup[b64.charCodeAt(i + 2)] >> 2)
                arr[curByte++] = (tmp >> 8) & 0xFF
                arr[curByte++] = tmp & 0xFF
              }

              return arr
            }

            function tripletToBase64 (num) {
              return lookup[num >> 18 & 0x3F] +
                lookup[num >> 12 & 0x3F] +
                lookup[num >> 6 & 0x3F] +
                lookup[num & 0x3F]
            }

            function encodeChunk (uint8, start, end) {
              var tmp
              var output = []
              for (var i = start; i < end; i += 3) {
                tmp =
                  ((uint8[i] << 16) & 0xFF0000) +
                  ((uint8[i + 1] << 8) & 0xFF00) +
                  (uint8[i + 2] & 0xFF)
                output.push(tripletToBase64(tmp))
              }
              return output.join('')
            }

            function fromByteArray (uint8) {
              var tmp
              var len = uint8.length
              var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
              var parts = []
              var maxChunkLength = 16383 // must be multiple of 3

              // go through the array every three bytes, we'll deal with trailing stuff later
              for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
                parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
              }

              // pad the end with zeros, but make sure to not forget the extra bytes
              if (extraBytes === 1) {
                tmp = uint8[len - 1]
                parts.push(
                  lookup[tmp >> 2] +
                  lookup[(tmp << 4) & 0x3F] +
                  '=='
                )
              } else if (extraBytes === 2) {
                tmp = (uint8[len - 2] << 8) + uint8[len - 1]
                parts.push(
                  lookup[tmp >> 10] +
                  lookup[(tmp >> 4) & 0x3F] +
                  lookup[(tmp << 2) & 0x3F] +
                  '='
                )
              }

              return parts.join('')
            }

            },{}],2:[function(require,module,exports){

            },{}],3:[function(require,module,exports){
            (function (Buffer){(function (){
            /*!
             * The buffer module from node.js, for the browser.
             *
             * @author   Feross Aboukhadijeh <https://feross.org>
             * @license  MIT
             */
            /* eslint-disable no-proto */

            'use strict'

            var base64 = require('base64-js')
            var ieee754 = require('ieee754')

            exports.Buffer = Buffer
            exports.SlowBuffer = SlowBuffer
            exports.INSPECT_MAX_BYTES = 50

            var K_MAX_LENGTH = 0x7fffffff
            exports.kMaxLength = K_MAX_LENGTH

            /**
             * If `Buffer.TYPED_ARRAY_SUPPORT`:
             *   === true    Use Uint8Array implementation (fastest)
             *   === false   Print warning and recommend using `buffer` v4.x which has an Object
             *               implementation (most compatible, even IE6)
             *
             * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
             * Opera 11.6+, iOS 4.2+.
             *
             * We report that the browser does not support typed arrays if the are not subclassable
             * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
             * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
             * for __proto__ and has a buggy typed array implementation.
             */
            Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

            if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
                typeof console.error === 'function') {
              console.error(
                'This browser lacks typed array (Uint8Array) support which is required by ' +
                '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
              )
            }

            function typedArraySupport () {
              // Can typed array instances can be augmented?
              try {
                var arr = new Uint8Array(1)
                arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
                return arr.foo() === 42
              } catch (e) {
                return false
              }
            }

            Object.defineProperty(Buffer.prototype, 'parent', {
              enumerable: true,
              get: function () {
                if (!Buffer.isBuffer(this)) return undefined
                return this.buffer
              }
            })

            Object.defineProperty(Buffer.prototype, 'offset', {
              enumerable: true,
              get: function () {
                if (!Buffer.isBuffer(this)) return undefined
                return this.byteOffset
              }
            })

            function createBuffer (length) {
              if (length > K_MAX_LENGTH) {
                throw new RangeError('The value "' + length + '" is invalid for option "size"')
              }
              // Return an augmented `Uint8Array` instance
              var buf = new Uint8Array(length)
              buf.__proto__ = Buffer.prototype
              return buf
            }

            /**
             * The Buffer constructor returns instances of `Uint8Array` that have their
             * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
             * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
             * and the `Uint8Array` methods. Square bracket notation works as expected -- it
             * returns a single octet.
             *
             * The `Uint8Array` prototype remains unmodified.
             */

            function Buffer (arg, encodingOrOffset, length) {
              // Common case.
              if (typeof arg === 'number') {
                if (typeof encodingOrOffset === 'string') {
                  throw new TypeError(
                    'The "string" argument must be of type string. Received type number'
                  )
                }
                return allocUnsafe(arg)
              }
              return from(arg, encodingOrOffset, length)
            }

            // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
            if (typeof Symbol !== 'undefined' && Symbol.species != null &&
                Buffer[Symbol.species] === Buffer) {
              Object.defineProperty(Buffer, Symbol.species, {
                value: null,
                configurable: true,
                enumerable: false,
                writable: false
              })
            }

            Buffer.poolSize = 8192 // not used by this implementation

            function from (value, encodingOrOffset, length) {
              if (typeof value === 'string') {
                return fromString(value, encodingOrOffset)
              }

              if (ArrayBuffer.isView(value)) {
                return fromArrayLike(value)
              }

              if (value == null) {
                throw TypeError(
                  'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
                  'or Array-like Object. Received type ' + (typeof value)
                )
              }

              if (isInstance(value, ArrayBuffer) ||
                  (value && isInstance(value.buffer, ArrayBuffer))) {
                return fromArrayBuffer(value, encodingOrOffset, length)
              }

              if (typeof value === 'number') {
                throw new TypeError(
                  'The "value" argument must not be of type number. Received type number'
                )
              }

              var valueOf = value.valueOf && value.valueOf()
              if (valueOf != null && valueOf !== value) {
                return Buffer.from(valueOf, encodingOrOffset, length)
              }

              var b = fromObject(value)
              if (b) return b

              if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
                  typeof value[Symbol.toPrimitive] === 'function') {
                return Buffer.from(
                  value[Symbol.toPrimitive]('string'), encodingOrOffset, length
                )
              }

              throw new TypeError(
                'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
                'or Array-like Object. Received type ' + (typeof value)
              )
            }

            /**
             * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
             * if value is a number.
             * Buffer.from(str[, encoding])
             * Buffer.from(array)
             * Buffer.from(buffer)
             * Buffer.from(arrayBuffer[, byteOffset[, length]])
             **/
            Buffer.from = function (value, encodingOrOffset, length) {
              return from(value, encodingOrOffset, length)
            }

            // Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
            // https://github.com/feross/buffer/pull/148
            Buffer.prototype.__proto__ = Uint8Array.prototype
            Buffer.__proto__ = Uint8Array

            function assertSize (size) {
              if (typeof size !== 'number') {
                throw new TypeError('"size" argument must be of type number')
              } else if (size < 0) {
                throw new RangeError('The value "' + size + '" is invalid for option "size"')
              }
            }

            function alloc (size, fill, encoding) {
              assertSize(size)
              if (size <= 0) {
                return createBuffer(size)
              }
              if (fill !== undefined) {
                // Only pay attention to encoding if it's a string. This
                // prevents accidentally sending in a number that would
                // be interpretted as a start offset.
                return typeof encoding === 'string'
                  ? createBuffer(size).fill(fill, encoding)
                  : createBuffer(size).fill(fill)
              }
              return createBuffer(size)
            }

            /**
             * Creates a new filled Buffer instance.
             * alloc(size[, fill[, encoding]])
             **/
            Buffer.alloc = function (size, fill, encoding) {
              return alloc(size, fill, encoding)
            }

            function allocUnsafe (size) {
              assertSize(size)
              return createBuffer(size < 0 ? 0 : checked(size) | 0)
            }

            /**
             * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
             * */
            Buffer.allocUnsafe = function (size) {
              return allocUnsafe(size)
            }
            /**
             * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
             */
            Buffer.allocUnsafeSlow = function (size) {
              return allocUnsafe(size)
            }

            function fromString (string, encoding) {
              if (typeof encoding !== 'string' || encoding === '') {
                encoding = 'utf8'
              }

              if (!Buffer.isEncoding(encoding)) {
                throw new TypeError('Unknown encoding: ' + encoding)
              }

              var length = byteLength(string, encoding) | 0
              var buf = createBuffer(length)

              var actual = buf.write(string, encoding)

              if (actual !== length) {
                // Writing a hex string, for example, that contains invalid characters will
                // cause everything after the first invalid character to be ignored. (e.g.
                // 'abxxcd' will be treated as 'ab')
                buf = buf.slice(0, actual)
              }

              return buf
            }

            function fromArrayLike (array) {
              var length = array.length < 0 ? 0 : checked(array.length) | 0
              var buf = createBuffer(length)
              for (var i = 0; i < length; i += 1) {
                buf[i] = array[i] & 255
              }
              return buf
            }

            function fromArrayBuffer (array, byteOffset, length) {
              if (byteOffset < 0 || array.byteLength < byteOffset) {
                throw new RangeError('"offset" is outside of buffer bounds')
              }

              if (array.byteLength < byteOffset + (length || 0)) {
                throw new RangeError('"length" is outside of buffer bounds')
              }

              var buf
              if (byteOffset === undefined && length === undefined) {
                buf = new Uint8Array(array)
              } else if (length === undefined) {
                buf = new Uint8Array(array, byteOffset)
              } else {
                buf = new Uint8Array(array, byteOffset, length)
              }

              // Return an augmented `Uint8Array` instance
              buf.__proto__ = Buffer.prototype
              return buf
            }

            function fromObject (obj) {
              if (Buffer.isBuffer(obj)) {
                var len = checked(obj.length) | 0
                var buf = createBuffer(len)

                if (buf.length === 0) {
                  return buf
                }

                obj.copy(buf, 0, 0, len)
                return buf
              }

              if (obj.length !== undefined) {
                if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
                  return createBuffer(0)
                }
                return fromArrayLike(obj)
              }

              if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
                return fromArrayLike(obj.data)
              }
            }

            function checked (length) {
              // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
              // length is NaN (which is otherwise coerced to zero.)
              if (length >= K_MAX_LENGTH) {
                throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                                     'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
              }
              return length | 0
            }

            function SlowBuffer (length) {
              if (+length != length) { // eslint-disable-line eqeqeq
                length = 0
              }
              return Buffer.alloc(+length)
            }

            Buffer.isBuffer = function isBuffer (b) {
              return b != null && b._isBuffer === true &&
                b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
            }

            Buffer.compare = function compare (a, b) {
              if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
              if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
              if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
                throw new TypeError(
                  'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
                )
              }

              if (a === b) return 0

              var x = a.length
              var y = b.length

              for (var i = 0, len = Math.min(x, y); i < len; ++i) {
                if (a[i] !== b[i]) {
                  x = a[i]
                  y = b[i]
                  break
                }
              }

              if (x < y) return -1
              if (y < x) return 1
              return 0
            }

            Buffer.isEncoding = function isEncoding (encoding) {
              switch (String(encoding).toLowerCase()) {
                case 'hex':
                case 'utf8':
                case 'utf-8':
                case 'ascii':
                case 'latin1':
                case 'binary':
                case 'base64':
                case 'ucs2':
                case 'ucs-2':
                case 'utf16le':
                case 'utf-16le':
                  return true
                default:
                  return false
              }
            }

            Buffer.concat = function concat (list, length) {
              if (!Array.isArray(list)) {
                throw new TypeError('"list" argument must be an Array of Buffers')
              }

              if (list.length === 0) {
                return Buffer.alloc(0)
              }

              var i
              if (length === undefined) {
                length = 0
                for (i = 0; i < list.length; ++i) {
                  length += list[i].length
                }
              }

              var buffer = Buffer.allocUnsafe(length)
              var pos = 0
              for (i = 0; i < list.length; ++i) {
                var buf = list[i]
                if (isInstance(buf, Uint8Array)) {
                  buf = Buffer.from(buf)
                }
                if (!Buffer.isBuffer(buf)) {
                  throw new TypeError('"list" argument must be an Array of Buffers')
                }
                buf.copy(buffer, pos)
                pos += buf.length
              }
              return buffer
            }

            function byteLength (string, encoding) {
              if (Buffer.isBuffer(string)) {
                return string.length
              }
              if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
                return string.byteLength
              }
              if (typeof string !== 'string') {
                throw new TypeError(
                  'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
                  'Received type ' + typeof string
                )
              }

              var len = string.length
              var mustMatch = (arguments.length > 2 && arguments[2] === true)
              if (!mustMatch && len === 0) return 0

              // Use a for loop to avoid recursion
              var loweredCase = false
              for (;;) {
                switch (encoding) {
                  case 'ascii':
                  case 'latin1':
                  case 'binary':
                    return len
                  case 'utf8':
                  case 'utf-8':
                    return utf8ToBytes(string).length
                  case 'ucs2':
                  case 'ucs-2':
                  case 'utf16le':
                  case 'utf-16le':
                    return len * 2
                  case 'hex':
                    return len >>> 1
                  case 'base64':
                    return base64ToBytes(string).length
                  default:
                    if (loweredCase) {
                      return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
                    }
                    encoding = ('' + encoding).toLowerCase()
                    loweredCase = true
                }
              }
            }
            Buffer.byteLength = byteLength

            function slowToString (encoding, start, end) {
              var loweredCase = false

              // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
              // property of a typed array.

              // This behaves neither like String nor Uint8Array in that we set start/end
              // to their upper/lower bounds if the value passed is out of range.
              // undefined is handled specially as per ECMA-262 6th Edition,
              // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
              if (start === undefined || start < 0) {
                start = 0
              }
              // Return early if start > this.length. Done here to prevent potential uint32
              // coercion fail below.
              if (start > this.length) {
                return ''
              }

              if (end === undefined || end > this.length) {
                end = this.length
              }

              if (end <= 0) {
                return ''
              }

              // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
              end >>>= 0
              start >>>= 0

              if (end <= start) {
                return ''
              }

              if (!encoding) encoding = 'utf8'

              while (true) {
                switch (encoding) {
                  case 'hex':
                    return hexSlice(this, start, end)

                  case 'utf8':
                  case 'utf-8':
                    return utf8Slice(this, start, end)

                  case 'ascii':
                    return asciiSlice(this, start, end)

                  case 'latin1':
                  case 'binary':
                    return latin1Slice(this, start, end)

                  case 'base64':
                    return base64Slice(this, start, end)

                  case 'ucs2':
                  case 'ucs-2':
                  case 'utf16le':
                  case 'utf-16le':
                    return utf16leSlice(this, start, end)

                  default:
                    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                    encoding = (encoding + '').toLowerCase()
                    loweredCase = true
                }
              }
            }

            // This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
            // to detect a Buffer instance. It's not possible to use `instanceof Buffer`
            // reliably in a browserify context because there could be multiple different
            // copies of the 'buffer' package in use. This method works even for Buffer
            // instances that were created from another copy of the `buffer` package.
            // See: https://github.com/feross/buffer/issues/154
            Buffer.prototype._isBuffer = true

            function swap (b, n, m) {
              var i = b[n]
              b[n] = b[m]
              b[m] = i
            }

            Buffer.prototype.swap16 = function swap16 () {
              var len = this.length
              if (len % 2 !== 0) {
                throw new RangeError('Buffer size must be a multiple of 16-bits')
              }
              for (var i = 0; i < len; i += 2) {
                swap(this, i, i + 1)
              }
              return this
            }

            Buffer.prototype.swap32 = function swap32 () {
              var len = this.length
              if (len % 4 !== 0) {
                throw new RangeError('Buffer size must be a multiple of 32-bits')
              }
              for (var i = 0; i < len; i += 4) {
                swap(this, i, i + 3)
                swap(this, i + 1, i + 2)
              }
              return this
            }

            Buffer.prototype.swap64 = function swap64 () {
              var len = this.length
              if (len % 8 !== 0) {
                throw new RangeError('Buffer size must be a multiple of 64-bits')
              }
              for (var i = 0; i < len; i += 8) {
                swap(this, i, i + 7)
                swap(this, i + 1, i + 6)
                swap(this, i + 2, i + 5)
                swap(this, i + 3, i + 4)
              }
              return this
            }

            Buffer.prototype.toString = function toString () {
              var length = this.length
              if (length === 0) return ''
              if (arguments.length === 0) return utf8Slice(this, 0, length)
              return slowToString.apply(this, arguments)
            }

            Buffer.prototype.toLocaleString = Buffer.prototype.toString

            Buffer.prototype.equals = function equals (b) {
              if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
              if (this === b) return true
              return Buffer.compare(this, b) === 0
            }

            Buffer.prototype.inspect = function inspect () {
              var str = ''
              var max = exports.INSPECT_MAX_BYTES
              str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
              if (this.length > max) str += ' ... '
              return '<Buffer ' + str + '>'
            }

            Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
              if (isInstance(target, Uint8Array)) {
                target = Buffer.from(target, target.offset, target.byteLength)
              }
              if (!Buffer.isBuffer(target)) {
                throw new TypeError(
                  'The "target" argument must be one of type Buffer or Uint8Array. ' +
                  'Received type ' + (typeof target)
                )
              }

              if (start === undefined) {
                start = 0
              }
              if (end === undefined) {
                end = target ? target.length : 0
              }
              if (thisStart === undefined) {
                thisStart = 0
              }
              if (thisEnd === undefined) {
                thisEnd = this.length
              }

              if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
                throw new RangeError('out of range index')
              }

              if (thisStart >= thisEnd && start >= end) {
                return 0
              }
              if (thisStart >= thisEnd) {
                return -1
              }
              if (start >= end) {
                return 1
              }

              start >>>= 0
              end >>>= 0
              thisStart >>>= 0
              thisEnd >>>= 0

              if (this === target) return 0

              var x = thisEnd - thisStart
              var y = end - start
              var len = Math.min(x, y)

              var thisCopy = this.slice(thisStart, thisEnd)
              var targetCopy = target.slice(start, end)

              for (var i = 0; i < len; ++i) {
                if (thisCopy[i] !== targetCopy[i]) {
                  x = thisCopy[i]
                  y = targetCopy[i]
                  break
                }
              }

              if (x < y) return -1
              if (y < x) return 1
              return 0
            }

            // Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
            // OR the last index of `val` in `buffer` at offset <= `byteOffset`.
            //
            // Arguments:
            // - buffer - a Buffer to search
            // - val - a string, Buffer, or number
            // - byteOffset - an index into `buffer`; will be clamped to an int32
            // - encoding - an optional encoding, relevant is val is a string
            // - dir - true for indexOf, false for lastIndexOf
            function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
              // Empty buffer means no match
              if (buffer.length === 0) return -1

              // Normalize byteOffset
              if (typeof byteOffset === 'string') {
                encoding = byteOffset
                byteOffset = 0
              } else if (byteOffset > 0x7fffffff) {
                byteOffset = 0x7fffffff
              } else if (byteOffset < -0x80000000) {
                byteOffset = -0x80000000
              }
              byteOffset = +byteOffset // Coerce to Number.
              if (numberIsNaN(byteOffset)) {
                // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
                byteOffset = dir ? 0 : (buffer.length - 1)
              }

              // Normalize byteOffset: negative offsets start from the end of the buffer
              if (byteOffset < 0) byteOffset = buffer.length + byteOffset
              if (byteOffset >= buffer.length) {
                if (dir) return -1
                else byteOffset = buffer.length - 1
              } else if (byteOffset < 0) {
                if (dir) byteOffset = 0
                else return -1
              }

              // Normalize val
              if (typeof val === 'string') {
                val = Buffer.from(val, encoding)
              }

              // Finally, search either indexOf (if dir is true) or lastIndexOf
              if (Buffer.isBuffer(val)) {
                // Special case: looking for empty string/buffer always fails
                if (val.length === 0) {
                  return -1
                }
                return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
              } else if (typeof val === 'number') {
                val = val & 0xFF // Search for a byte value [0-255]
                if (typeof Uint8Array.prototype.indexOf === 'function') {
                  if (dir) {
                    return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
                  } else {
                    return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
                  }
                }
                return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
              }

              throw new TypeError('val must be string, number or Buffer')
            }

            function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
              var indexSize = 1
              var arrLength = arr.length
              var valLength = val.length

              if (encoding !== undefined) {
                encoding = String(encoding).toLowerCase()
                if (encoding === 'ucs2' || encoding === 'ucs-2' ||
                    encoding === 'utf16le' || encoding === 'utf-16le') {
                  if (arr.length < 2 || val.length < 2) {
                    return -1
                  }
                  indexSize = 2
                  arrLength /= 2
                  valLength /= 2
                  byteOffset /= 2
                }
              }

              function read (buf, i) {
                if (indexSize === 1) {
                  return buf[i]
                } else {
                  return buf.readUInt16BE(i * indexSize)
                }
              }

              var i
              if (dir) {
                var foundIndex = -1
                for (i = byteOffset; i < arrLength; i++) {
                  if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
                    if (foundIndex === -1) foundIndex = i
                    if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
                  } else {
                    if (foundIndex !== -1) i -= i - foundIndex
                    foundIndex = -1
                  }
                }
              } else {
                if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
                for (i = byteOffset; i >= 0; i--) {
                  var found = true
                  for (var j = 0; j < valLength; j++) {
                    if (read(arr, i + j) !== read(val, j)) {
                      found = false
                      break
                    }
                  }
                  if (found) return i
                }
              }

              return -1
            }

            Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
              return this.indexOf(val, byteOffset, encoding) !== -1
            }

            Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
              return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
            }

            Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
              return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
            }

            function hexWrite (buf, string, offset, length) {
              offset = Number(offset) || 0
              var remaining = buf.length - offset
              if (!length) {
                length = remaining
              } else {
                length = Number(length)
                if (length > remaining) {
                  length = remaining
                }
              }

              var strLen = string.length

              if (length > strLen / 2) {
                length = strLen / 2
              }
              for (var i = 0; i < length; ++i) {
                var parsed = parseInt(string.substr(i * 2, 2), 16)
                if (numberIsNaN(parsed)) return i
                buf[offset + i] = parsed
              }
              return i
            }

            function utf8Write (buf, string, offset, length) {
              return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
            }

            function asciiWrite (buf, string, offset, length) {
              return blitBuffer(asciiToBytes(string), buf, offset, length)
            }

            function latin1Write (buf, string, offset, length) {
              return asciiWrite(buf, string, offset, length)
            }

            function base64Write (buf, string, offset, length) {
              return blitBuffer(base64ToBytes(string), buf, offset, length)
            }

            function ucs2Write (buf, string, offset, length) {
              return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
            }

            Buffer.prototype.write = function write (string, offset, length, encoding) {
              // Buffer#write(string)
              if (offset === undefined) {
                encoding = 'utf8'
                length = this.length
                offset = 0
              // Buffer#write(string, encoding)
              } else if (length === undefined && typeof offset === 'string') {
                encoding = offset
                length = this.length
                offset = 0
              // Buffer#write(string, offset[, length][, encoding])
              } else if (isFinite(offset)) {
                offset = offset >>> 0
                if (isFinite(length)) {
                  length = length >>> 0
                  if (encoding === undefined) encoding = 'utf8'
                } else {
                  encoding = length
                  length = undefined
                }
              } else {
                throw new Error(
                  'Buffer.write(string, encoding, offset[, length]) is no longer supported'
                )
              }

              var remaining = this.length - offset
              if (length === undefined || length > remaining) length = remaining

              if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
                throw new RangeError('Attempt to write outside buffer bounds')
              }

              if (!encoding) encoding = 'utf8'

              var loweredCase = false
              for (;;) {
                switch (encoding) {
                  case 'hex':
                    return hexWrite(this, string, offset, length)

                  case 'utf8':
                  case 'utf-8':
                    return utf8Write(this, string, offset, length)

                  case 'ascii':
                    return asciiWrite(this, string, offset, length)

                  case 'latin1':
                  case 'binary':
                    return latin1Write(this, string, offset, length)

                  case 'base64':
                    // Warning: maxLength not taken into account in base64Write
                    return base64Write(this, string, offset, length)

                  case 'ucs2':
                  case 'ucs-2':
                  case 'utf16le':
                  case 'utf-16le':
                    return ucs2Write(this, string, offset, length)

                  default:
                    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                    encoding = ('' + encoding).toLowerCase()
                    loweredCase = true
                }
              }
            }

            Buffer.prototype.toJSON = function toJSON () {
              return {
                type: 'Buffer',
                data: Array.prototype.slice.call(this._arr || this, 0)
              }
            }

            function base64Slice (buf, start, end) {
              if (start === 0 && end === buf.length) {
                return base64.fromByteArray(buf)
              } else {
                return base64.fromByteArray(buf.slice(start, end))
              }
            }

            function utf8Slice (buf, start, end) {
              end = Math.min(buf.length, end)
              var res = []

              var i = start
              while (i < end) {
                var firstByte = buf[i]
                var codePoint = null
                var bytesPerSequence = (firstByte > 0xEF) ? 4
                  : (firstByte > 0xDF) ? 3
                    : (firstByte > 0xBF) ? 2
                      : 1

                if (i + bytesPerSequence <= end) {
                  var secondByte, thirdByte, fourthByte, tempCodePoint

                  switch (bytesPerSequence) {
                    case 1:
                      if (firstByte < 0x80) {
                        codePoint = firstByte
                      }
                      break
                    case 2:
                      secondByte = buf[i + 1]
                      if ((secondByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
                        if (tempCodePoint > 0x7F) {
                          codePoint = tempCodePoint
                        }
                      }
                      break
                    case 3:
                      secondByte = buf[i + 1]
                      thirdByte = buf[i + 2]
                      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
                        if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                          codePoint = tempCodePoint
                        }
                      }
                      break
                    case 4:
                      secondByte = buf[i + 1]
                      thirdByte = buf[i + 2]
                      fourthByte = buf[i + 3]
                      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
                        if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                          codePoint = tempCodePoint
                        }
                      }
                  }
                }

                if (codePoint === null) {
                  // we did not generate a valid codePoint so insert a
                  // replacement char (U+FFFD) and advance only 1 byte
                  codePoint = 0xFFFD
                  bytesPerSequence = 1
                } else if (codePoint > 0xFFFF) {
                  // encode to utf16 (surrogate pair dance)
                  codePoint -= 0x10000
                  res.push(codePoint >>> 10 & 0x3FF | 0xD800)
                  codePoint = 0xDC00 | codePoint & 0x3FF
                }

                res.push(codePoint)
                i += bytesPerSequence
              }

              return decodeCodePointsArray(res)
            }

            // Based on http://stackoverflow.com/a/22747272/680742, the browser with
            // the lowest limit is Chrome, with 0x10000 args.
            // We go 1 magnitude less, for safety
            var MAX_ARGUMENTS_LENGTH = 0x1000

            function decodeCodePointsArray (codePoints) {
              var len = codePoints.length
              if (len <= MAX_ARGUMENTS_LENGTH) {
                return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
              }

              // Decode in chunks to avoid "call stack size exceeded".
              var res = ''
              var i = 0
              while (i < len) {
                res += String.fromCharCode.apply(
                  String,
                  codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
                )
              }
              return res
            }

            function asciiSlice (buf, start, end) {
              var ret = ''
              end = Math.min(buf.length, end)

              for (var i = start; i < end; ++i) {
                ret += String.fromCharCode(buf[i] & 0x7F)
              }
              return ret
            }

            function latin1Slice (buf, start, end) {
              var ret = ''
              end = Math.min(buf.length, end)

              for (var i = start; i < end; ++i) {
                ret += String.fromCharCode(buf[i])
              }
              return ret
            }

            function hexSlice (buf, start, end) {
              var len = buf.length

              if (!start || start < 0) start = 0
              if (!end || end < 0 || end > len) end = len

              var out = ''
              for (var i = start; i < end; ++i) {
                out += toHex(buf[i])
              }
              return out
            }

            function utf16leSlice (buf, start, end) {
              var bytes = buf.slice(start, end)
              var res = ''
              for (var i = 0; i < bytes.length; i += 2) {
                res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
              }
              return res
            }

            Buffer.prototype.slice = function slice (start, end) {
              var len = this.length
              start = ~~start
              end = end === undefined ? len : ~~end

              if (start < 0) {
                start += len
                if (start < 0) start = 0
              } else if (start > len) {
                start = len
              }

              if (end < 0) {
                end += len
                if (end < 0) end = 0
              } else if (end > len) {
                end = len
              }

              if (end < start) end = start

              var newBuf = this.subarray(start, end)
              // Return an augmented `Uint8Array` instance
              newBuf.__proto__ = Buffer.prototype
              return newBuf
            }

            /*
             * Need to make sure that buffer isn't trying to write out of bounds.
             */
            function checkOffset (offset, ext, length) {
              if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
              if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
            }

            Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) checkOffset(offset, byteLength, this.length)

              var val = this[offset]
              var mul = 1
              var i = 0
              while (++i < byteLength && (mul *= 0x100)) {
                val += this[offset + i] * mul
              }

              return val
            }

            Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) {
                checkOffset(offset, byteLength, this.length)
              }

              var val = this[offset + --byteLength]
              var mul = 1
              while (byteLength > 0 && (mul *= 0x100)) {
                val += this[offset + --byteLength] * mul
              }

              return val
            }

            Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 1, this.length)
              return this[offset]
            }

            Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              return this[offset] | (this[offset + 1] << 8)
            }

            Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              return (this[offset] << 8) | this[offset + 1]
            }

            Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return ((this[offset]) |
                  (this[offset + 1] << 8) |
                  (this[offset + 2] << 16)) +
                  (this[offset + 3] * 0x1000000)
            }

            Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return (this[offset] * 0x1000000) +
                ((this[offset + 1] << 16) |
                (this[offset + 2] << 8) |
                this[offset + 3])
            }

            Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) checkOffset(offset, byteLength, this.length)

              var val = this[offset]
              var mul = 1
              var i = 0
              while (++i < byteLength && (mul *= 0x100)) {
                val += this[offset + i] * mul
              }
              mul *= 0x80

              if (val >= mul) val -= Math.pow(2, 8 * byteLength)

              return val
            }

            Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) checkOffset(offset, byteLength, this.length)

              var i = byteLength
              var mul = 1
              var val = this[offset + --i]
              while (i > 0 && (mul *= 0x100)) {
                val += this[offset + --i] * mul
              }
              mul *= 0x80

              if (val >= mul) val -= Math.pow(2, 8 * byteLength)

              return val
            }

            Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 1, this.length)
              if (!(this[offset] & 0x80)) return (this[offset])
              return ((0xff - this[offset] + 1) * -1)
            }

            Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              var val = this[offset] | (this[offset + 1] << 8)
              return (val & 0x8000) ? val | 0xFFFF0000 : val
            }

            Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              var val = this[offset + 1] | (this[offset] << 8)
              return (val & 0x8000) ? val | 0xFFFF0000 : val
            }

            Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return (this[offset]) |
                (this[offset + 1] << 8) |
                (this[offset + 2] << 16) |
                (this[offset + 3] << 24)
            }

            Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return (this[offset] << 24) |
                (this[offset + 1] << 16) |
                (this[offset + 2] << 8) |
                (this[offset + 3])
            }

            Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)
              return ieee754.read(this, offset, true, 23, 4)
            }

            Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)
              return ieee754.read(this, offset, false, 23, 4)
            }

            Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 8, this.length)
              return ieee754.read(this, offset, true, 52, 8)
            }

            Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 8, this.length)
              return ieee754.read(this, offset, false, 52, 8)
            }

            function checkInt (buf, value, offset, ext, max, min) {
              if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
              if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
              if (offset + ext > buf.length) throw new RangeError('Index out of range')
            }

            Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) {
                var maxBytes = Math.pow(2, 8 * byteLength) - 1
                checkInt(this, value, offset, byteLength, maxBytes, 0)
              }

              var mul = 1
              var i = 0
              this[offset] = value & 0xFF
              while (++i < byteLength && (mul *= 0x100)) {
                this[offset + i] = (value / mul) & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) {
                var maxBytes = Math.pow(2, 8 * byteLength) - 1
                checkInt(this, value, offset, byteLength, maxBytes, 0)
              }

              var i = byteLength - 1
              var mul = 1
              this[offset + i] = value & 0xFF
              while (--i >= 0 && (mul *= 0x100)) {
                this[offset + i] = (value / mul) & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
              this[offset] = (value & 0xff)
              return offset + 1
            }

            Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
              this[offset] = (value & 0xff)
              this[offset + 1] = (value >>> 8)
              return offset + 2
            }

            Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
              this[offset] = (value >>> 8)
              this[offset + 1] = (value & 0xff)
              return offset + 2
            }

            Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
              this[offset + 3] = (value >>> 24)
              this[offset + 2] = (value >>> 16)
              this[offset + 1] = (value >>> 8)
              this[offset] = (value & 0xff)
              return offset + 4
            }

            Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
              this[offset] = (value >>> 24)
              this[offset + 1] = (value >>> 16)
              this[offset + 2] = (value >>> 8)
              this[offset + 3] = (value & 0xff)
              return offset + 4
            }

            Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                var limit = Math.pow(2, (8 * byteLength) - 1)

                checkInt(this, value, offset, byteLength, limit - 1, -limit)
              }

              var i = 0
              var mul = 1
              var sub = 0
              this[offset] = value & 0xFF
              while (++i < byteLength && (mul *= 0x100)) {
                if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
                  sub = 1
                }
                this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                var limit = Math.pow(2, (8 * byteLength) - 1)

                checkInt(this, value, offset, byteLength, limit - 1, -limit)
              }

              var i = byteLength - 1
              var mul = 1
              var sub = 0
              this[offset + i] = value & 0xFF
              while (--i >= 0 && (mul *= 0x100)) {
                if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
                  sub = 1
                }
                this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
              if (value < 0) value = 0xff + value + 1
              this[offset] = (value & 0xff)
              return offset + 1
            }

            Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
              this[offset] = (value & 0xff)
              this[offset + 1] = (value >>> 8)
              return offset + 2
            }

            Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
              this[offset] = (value >>> 8)
              this[offset + 1] = (value & 0xff)
              return offset + 2
            }

            Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
              this[offset] = (value & 0xff)
              this[offset + 1] = (value >>> 8)
              this[offset + 2] = (value >>> 16)
              this[offset + 3] = (value >>> 24)
              return offset + 4
            }

            Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
              if (value < 0) value = 0xffffffff + value + 1
              this[offset] = (value >>> 24)
              this[offset + 1] = (value >>> 16)
              this[offset + 2] = (value >>> 8)
              this[offset + 3] = (value & 0xff)
              return offset + 4
            }

            function checkIEEE754 (buf, value, offset, ext, max, min) {
              if (offset + ext > buf.length) throw new RangeError('Index out of range')
              if (offset < 0) throw new RangeError('Index out of range')
            }

            function writeFloat (buf, value, offset, littleEndian, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
              }
              ieee754.write(buf, value, offset, littleEndian, 23, 4)
              return offset + 4
            }

            Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
              return writeFloat(this, value, offset, true, noAssert)
            }

            Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
              return writeFloat(this, value, offset, false, noAssert)
            }

            function writeDouble (buf, value, offset, littleEndian, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
              }
              ieee754.write(buf, value, offset, littleEndian, 52, 8)
              return offset + 8
            }

            Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
              return writeDouble(this, value, offset, true, noAssert)
            }

            Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
              return writeDouble(this, value, offset, false, noAssert)
            }

            // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
            Buffer.prototype.copy = function copy (target, targetStart, start, end) {
              if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
              if (!start) start = 0
              if (!end && end !== 0) end = this.length
              if (targetStart >= target.length) targetStart = target.length
              if (!targetStart) targetStart = 0
              if (end > 0 && end < start) end = start

              // Copy 0 bytes; we're done
              if (end === start) return 0
              if (target.length === 0 || this.length === 0) return 0

              // Fatal error conditions
              if (targetStart < 0) {
                throw new RangeError('targetStart out of bounds')
              }
              if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
              if (end < 0) throw new RangeError('sourceEnd out of bounds')

              // Are we oob?
              if (end > this.length) end = this.length
              if (target.length - targetStart < end - start) {
                end = target.length - targetStart + start
              }

              var len = end - start

              if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
                // Use built-in when available, missing from IE11
                this.copyWithin(targetStart, start, end)
              } else if (this === target && start < targetStart && targetStart < end) {
                // descending copy from end
                for (var i = len - 1; i >= 0; --i) {
                  target[i + targetStart] = this[i + start]
                }
              } else {
                Uint8Array.prototype.set.call(
                  target,
                  this.subarray(start, end),
                  targetStart
                )
              }

              return len
            }

            // Usage:
            //    buffer.fill(number[, offset[, end]])
            //    buffer.fill(buffer[, offset[, end]])
            //    buffer.fill(string[, offset[, end]][, encoding])
            Buffer.prototype.fill = function fill (val, start, end, encoding) {
              // Handle string cases:
              if (typeof val === 'string') {
                if (typeof start === 'string') {
                  encoding = start
                  start = 0
                  end = this.length
                } else if (typeof end === 'string') {
                  encoding = end
                  end = this.length
                }
                if (encoding !== undefined && typeof encoding !== 'string') {
                  throw new TypeError('encoding must be a string')
                }
                if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
                  throw new TypeError('Unknown encoding: ' + encoding)
                }
                if (val.length === 1) {
                  var code = val.charCodeAt(0)
                  if ((encoding === 'utf8' && code < 128) ||
                      encoding === 'latin1') {
                    // Fast path: If `val` fits into a single byte, use that numeric value.
                    val = code
                  }
                }
              } else if (typeof val === 'number') {
                val = val & 255
              }

              // Invalid ranges are not set to a default, so can range check early.
              if (start < 0 || this.length < start || this.length < end) {
                throw new RangeError('Out of range index')
              }

              if (end <= start) {
                return this
              }

              start = start >>> 0
              end = end === undefined ? this.length : end >>> 0

              if (!val) val = 0

              var i
              if (typeof val === 'number') {
                for (i = start; i < end; ++i) {
                  this[i] = val
                }
              } else {
                var bytes = Buffer.isBuffer(val)
                  ? val
                  : Buffer.from(val, encoding)
                var len = bytes.length
                if (len === 0) {
                  throw new TypeError('The value "' + val +
                    '" is invalid for argument "value"')
                }
                for (i = 0; i < end - start; ++i) {
                  this[i + start] = bytes[i % len]
                }
              }

              return this
            }

            // HELPER FUNCTIONS
            // ================

            var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

            function base64clean (str) {
              // Node takes equal signs as end of the Base64 encoding
              str = str.split('=')[0]
              // Node strips out invalid characters like \n and \t from the string, base64-js does not
              str = str.trim().replace(INVALID_BASE64_RE, '')
              // Node converts strings with length < 2 to ''
              if (str.length < 2) return ''
              // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
              while (str.length % 4 !== 0) {
                str = str + '='
              }
              return str
            }

            function toHex (n) {
              if (n < 16) return '0' + n.toString(16)
              return n.toString(16)
            }

            function utf8ToBytes (string, units) {
              units = units || Infinity
              var codePoint
              var length = string.length
              var leadSurrogate = null
              var bytes = []

              for (var i = 0; i < length; ++i) {
                codePoint = string.charCodeAt(i)

                // is surrogate component
                if (codePoint > 0xD7FF && codePoint < 0xE000) {
                  // last char was a lead
                  if (!leadSurrogate) {
                    // no lead yet
                    if (codePoint > 0xDBFF) {
                      // unexpected trail
                      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                      continue
                    } else if (i + 1 === length) {
                      // unpaired lead
                      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                      continue
                    }

                    // valid lead
                    leadSurrogate = codePoint

                    continue
                  }

                  // 2 leads in a row
                  if (codePoint < 0xDC00) {
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    leadSurrogate = codePoint
                    continue
                  }

                  // valid surrogate pair
                  codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
                } else if (leadSurrogate) {
                  // valid bmp char, but last char was a lead
                  if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                }

                leadSurrogate = null

                // encode utf8
                if (codePoint < 0x80) {
                  if ((units -= 1) < 0) break
                  bytes.push(codePoint)
                } else if (codePoint < 0x800) {
                  if ((units -= 2) < 0) break
                  bytes.push(
                    codePoint >> 0x6 | 0xC0,
                    codePoint & 0x3F | 0x80
                  )
                } else if (codePoint < 0x10000) {
                  if ((units -= 3) < 0) break
                  bytes.push(
                    codePoint >> 0xC | 0xE0,
                    codePoint >> 0x6 & 0x3F | 0x80,
                    codePoint & 0x3F | 0x80
                  )
                } else if (codePoint < 0x110000) {
                  if ((units -= 4) < 0) break
                  bytes.push(
                    codePoint >> 0x12 | 0xF0,
                    codePoint >> 0xC & 0x3F | 0x80,
                    codePoint >> 0x6 & 0x3F | 0x80,
                    codePoint & 0x3F | 0x80
                  )
                } else {
                  throw new Error('Invalid code point')
                }
              }

              return bytes
            }

            function asciiToBytes (str) {
              var byteArray = []
              for (var i = 0; i < str.length; ++i) {
                // Node's code seems to be doing this and not & 0x7F..
                byteArray.push(str.charCodeAt(i) & 0xFF)
              }
              return byteArray
            }

            function utf16leToBytes (str, units) {
              var c, hi, lo
              var byteArray = []
              for (var i = 0; i < str.length; ++i) {
                if ((units -= 2) < 0) break

                c = str.charCodeAt(i)
                hi = c >> 8
                lo = c % 256
                byteArray.push(lo)
                byteArray.push(hi)
              }

              return byteArray
            }

            function base64ToBytes (str) {
              return base64.toByteArray(base64clean(str))
            }

            function blitBuffer (src, dst, offset, length) {
              for (var i = 0; i < length; ++i) {
                if ((i + offset >= dst.length) || (i >= src.length)) break
                dst[i + offset] = src[i]
              }
              return i
            }

            // ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
            // the `instanceof` check but they should be treated as of that type.
            // See: https://github.com/feross/buffer/issues/166
            function isInstance (obj, type) {
              return obj instanceof type ||
                (obj != null && obj.constructor != null && obj.constructor.name != null &&
                  obj.constructor.name === type.name)
            }
            function numberIsNaN (obj) {
              // For IE11 support
              return obj !== obj // eslint-disable-line no-self-compare
            }

            }).call(this)}).call(this,require("buffer").Buffer)
            },{"base64-js":1,"buffer":3,"ieee754":5}],4:[function(require,module,exports){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.

            'use strict';

            var R = typeof Reflect === 'object' ? Reflect : null
            var ReflectApply = R && typeof R.apply === 'function'
              ? R.apply
              : function ReflectApply(target, receiver, args) {
                return Function.prototype.apply.call(target, receiver, args);
              }

            var ReflectOwnKeys
            if (R && typeof R.ownKeys === 'function') {
              ReflectOwnKeys = R.ownKeys
            } else if (Object.getOwnPropertySymbols) {
              ReflectOwnKeys = function ReflectOwnKeys(target) {
                return Object.getOwnPropertyNames(target)
                  .concat(Object.getOwnPropertySymbols(target));
              };
            } else {
              ReflectOwnKeys = function ReflectOwnKeys(target) {
                return Object.getOwnPropertyNames(target);
              };
            }

            function ProcessEmitWarning(warning) {
              if (console && console.warn) console.warn(warning);
            }

            var NumberIsNaN = Number.isNaN || function NumberIsNaN(value) {
              return value !== value;
            }

            function EventEmitter() {
              EventEmitter.init.call(this);
            }
            module.exports = EventEmitter;
            module.exports.once = once;

            // Backwards-compat with node 0.10.x
            EventEmitter.EventEmitter = EventEmitter;

            EventEmitter.prototype._events = undefined;
            EventEmitter.prototype._eventsCount = 0;
            EventEmitter.prototype._maxListeners = undefined;

            // By default EventEmitters will print a warning if more than 10 listeners are
            // added to it. This is a useful default which helps finding memory leaks.
            var defaultMaxListeners = 10;

            function checkListener(listener) {
              if (typeof listener !== 'function') {
                throw new TypeError('The "listener" argument must be of type Function. Received type ' + typeof listener);
              }
            }

            Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
              enumerable: true,
              get: function() {
                return defaultMaxListeners;
              },
              set: function(arg) {
                if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
                  throw new RangeError('The value of "defaultMaxListeners" is out of range. It must be a non-negative number. Received ' + arg + '.');
                }
                defaultMaxListeners = arg;
              }
            });

            EventEmitter.init = function() {

              if (this._events === undefined ||
                  this._events === Object.getPrototypeOf(this)._events) {
                this._events = Object.create(null);
                this._eventsCount = 0;
              }

              this._maxListeners = this._maxListeners || undefined;
            };

            // Obviously not all Emitters should be limited to 10. This function allows
            // that to be increased. Set to zero for unlimited.
            EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
              if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
                throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received ' + n + '.');
              }
              this._maxListeners = n;
              return this;
            };

            function _getMaxListeners(that) {
              if (that._maxListeners === undefined)
                return EventEmitter.defaultMaxListeners;
              return that._maxListeners;
            }

            EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
              return _getMaxListeners(this);
            };

            EventEmitter.prototype.emit = function emit(type) {
              var args = [];
              for (var i = 1; i < arguments.length; i++) args.push(arguments[i]);
              var doError = (type === 'error');

              var events = this._events;
              if (events !== undefined)
                doError = (doError && events.error === undefined);
              else if (!doError)
                return false;

              // If there is no 'error' event listener then throw.
              if (doError) {
                var er;
                if (args.length > 0)
                  er = args[0];
                if (er instanceof Error) {
                  // Note: The comments on the `throw` lines are intentional, they show
                  // up in Node's output if this results in an unhandled exception.
                  throw er; // Unhandled 'error' event
                }
                // At least give some kind of context to the user
                var err = new Error('Unhandled error.' + (er ? ' (' + er.message + ')' : ''));
                err.context = er;
                throw err; // Unhandled 'error' event
              }

              var handler = events[type];

              if (handler === undefined)
                return false;

              if (typeof handler === 'function') {
                ReflectApply(handler, this, args);
              } else {
                var len = handler.length;
                var listeners = arrayClone(handler, len);
                for (var i = 0; i < len; ++i)
                  ReflectApply(listeners[i], this, args);
              }

              return true;
            };

            function _addListener(target, type, listener, prepend) {
              var m;
              var events;
              var existing;

              checkListener(listener);

              events = target._events;
              if (events === undefined) {
                events = target._events = Object.create(null);
                target._eventsCount = 0;
              } else {
                // To avoid recursion in the case that type === "newListener"! Before
                // adding it to the listeners, first emit "newListener".
                if (events.newListener !== undefined) {
                  target.emit('newListener', type,
                              listener.listener ? listener.listener : listener);

                  // Re-assign `events` because a newListener handler could have caused the
                  // this._events to be assigned to a new object
                  events = target._events;
                }
                existing = events[type];
              }

              if (existing === undefined) {
                // Optimize the case of one listener. Don't need the extra array object.
                existing = events[type] = listener;
                ++target._eventsCount;
              } else {
                if (typeof existing === 'function') {
                  // Adding the second element, need to change to array.
                  existing = events[type] =
                    prepend ? [listener, existing] : [existing, listener];
                  // If we've already got an array, just append.
                } else if (prepend) {
                  existing.unshift(listener);
                } else {
                  existing.push(listener);
                }

                // Check for listener leak
                m = _getMaxListeners(target);
                if (m > 0 && existing.length > m && !existing.warned) {
                  existing.warned = true;
                  // No error code for this since it is a Warning
                  // eslint-disable-next-line no-restricted-syntax
                  var w = new Error('Possible EventEmitter memory leak detected. ' +
                                      existing.length + ' ' + String(type) + ' listeners ' +
                                      'added. Use emitter.setMaxListeners() to ' +
                                      'increase limit');
                  w.name = 'MaxListenersExceededWarning';
                  w.emitter = target;
                  w.type = type;
                  w.count = existing.length;
                  ProcessEmitWarning(w);
                }
              }

              return target;
            }

            EventEmitter.prototype.addListener = function addListener(type, listener) {
              return _addListener(this, type, listener, false);
            };

            EventEmitter.prototype.on = EventEmitter.prototype.addListener;

            EventEmitter.prototype.prependListener =
                function prependListener(type, listener) {
                  return _addListener(this, type, listener, true);
                };

            function onceWrapper() {
              if (!this.fired) {
                this.target.removeListener(this.type, this.wrapFn);
                this.fired = true;
                if (arguments.length === 0)
                  return this.listener.call(this.target);
                return this.listener.apply(this.target, arguments);
              }
            }

            function _onceWrap(target, type, listener) {
              var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
              var wrapped = onceWrapper.bind(state);
              wrapped.listener = listener;
              state.wrapFn = wrapped;
              return wrapped;
            }

            EventEmitter.prototype.once = function once(type, listener) {
              checkListener(listener);
              this.on(type, _onceWrap(this, type, listener));
              return this;
            };

            EventEmitter.prototype.prependOnceListener =
                function prependOnceListener(type, listener) {
                  checkListener(listener);
                  this.prependListener(type, _onceWrap(this, type, listener));
                  return this;
                };

            // Emits a 'removeListener' event if and only if the listener was removed.
            EventEmitter.prototype.removeListener =
                function removeListener(type, listener) {
                  var list, events, position, i, originalListener;

                  checkListener(listener);

                  events = this._events;
                  if (events === undefined)
                    return this;

                  list = events[type];
                  if (list === undefined)
                    return this;

                  if (list === listener || list.listener === listener) {
                    if (--this._eventsCount === 0)
                      this._events = Object.create(null);
                    else {
                      delete events[type];
                      if (events.removeListener)
                        this.emit('removeListener', type, list.listener || listener);
                    }
                  } else if (typeof list !== 'function') {
                    position = -1;

                    for (i = list.length - 1; i >= 0; i--) {
                      if (list[i] === listener || list[i].listener === listener) {
                        originalListener = list[i].listener;
                        position = i;
                        break;
                      }
                    }

                    if (position < 0)
                      return this;

                    if (position === 0)
                      list.shift();
                    else {
                      spliceOne(list, position);
                    }

                    if (list.length === 1)
                      events[type] = list[0];

                    if (events.removeListener !== undefined)
                      this.emit('removeListener', type, originalListener || listener);
                  }

                  return this;
                };

            EventEmitter.prototype.off = EventEmitter.prototype.removeListener;

            EventEmitter.prototype.removeAllListeners =
                function removeAllListeners(type) {
                  var listeners, events, i;

                  events = this._events;
                  if (events === undefined)
                    return this;

                  // not listening for removeListener, no need to emit
                  if (events.removeListener === undefined) {
                    if (arguments.length === 0) {
                      this._events = Object.create(null);
                      this._eventsCount = 0;
                    } else if (events[type] !== undefined) {
                      if (--this._eventsCount === 0)
                        this._events = Object.create(null);
                      else
                        delete events[type];
                    }
                    return this;
                  }

                  // emit removeListener for all listeners on all events
                  if (arguments.length === 0) {
                    var keys = Object.keys(events);
                    var key;
                    for (i = 0; i < keys.length; ++i) {
                      key = keys[i];
                      if (key === 'removeListener') continue;
                      this.removeAllListeners(key);
                    }
                    this.removeAllListeners('removeListener');
                    this._events = Object.create(null);
                    this._eventsCount = 0;
                    return this;
                  }

                  listeners = events[type];

                  if (typeof listeners === 'function') {
                    this.removeListener(type, listeners);
                  } else if (listeners !== undefined) {
                    // LIFO order
                    for (i = listeners.length - 1; i >= 0; i--) {
                      this.removeListener(type, listeners[i]);
                    }
                  }

                  return this;
                };

            function _listeners(target, type, unwrap) {
              var events = target._events;

              if (events === undefined)
                return [];

              var evlistener = events[type];
              if (evlistener === undefined)
                return [];

              if (typeof evlistener === 'function')
                return unwrap ? [evlistener.listener || evlistener] : [evlistener];

              return unwrap ?
                unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
            }

            EventEmitter.prototype.listeners = function listeners(type) {
              return _listeners(this, type, true);
            };

            EventEmitter.prototype.rawListeners = function rawListeners(type) {
              return _listeners(this, type, false);
            };

            EventEmitter.listenerCount = function(emitter, type) {
              if (typeof emitter.listenerCount === 'function') {
                return emitter.listenerCount(type);
              } else {
                return listenerCount.call(emitter, type);
              }
            };

            EventEmitter.prototype.listenerCount = listenerCount;
            function listenerCount(type) {
              var events = this._events;

              if (events !== undefined) {
                var evlistener = events[type];

                if (typeof evlistener === 'function') {
                  return 1;
                } else if (evlistener !== undefined) {
                  return evlistener.length;
                }
              }

              return 0;
            }

            EventEmitter.prototype.eventNames = function eventNames() {
              return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
            };

            function arrayClone(arr, n) {
              var copy = new Array(n);
              for (var i = 0; i < n; ++i)
                copy[i] = arr[i];
              return copy;
            }

            function spliceOne(list, index) {
              for (; index + 1 < list.length; index++)
                list[index] = list[index + 1];
              list.pop();
            }

            function unwrapListeners(arr) {
              var ret = new Array(arr.length);
              for (var i = 0; i < ret.length; ++i) {
                ret[i] = arr[i].listener || arr[i];
              }
              return ret;
            }

            function once(emitter, name) {
              return new Promise(function (resolve, reject) {
                function errorListener(err) {
                  emitter.removeListener(name, resolver);
                  reject(err);
                }

                function resolver() {
                  if (typeof emitter.removeListener === 'function') {
                    emitter.removeListener('error', errorListener);
                  }
                  resolve([].slice.call(arguments));
                };

                eventTargetAgnosticAddListener(emitter, name, resolver, { once: true });
                if (name !== 'error') {
                  addErrorHandlerIfEventEmitter(emitter, errorListener, { once: true });
                }
              });
            }

            function addErrorHandlerIfEventEmitter(emitter, handler, flags) {
              if (typeof emitter.on === 'function') {
                eventTargetAgnosticAddListener(emitter, 'error', handler, flags);
              }
            }

            function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
              if (typeof emitter.on === 'function') {
                if (flags.once) {
                  emitter.once(name, listener);
                } else {
                  emitter.on(name, listener);
                }
              } else if (typeof emitter.addEventListener === 'function') {
                // EventTarget does not have `error` event semantics like Node
                // EventEmitters, we do not listen for `error` events here.
                emitter.addEventListener(name, function wrapListener(arg) {
                  // IE does not have builtin `{ once: true }` support so we
                  // have to do it manually.
                  if (flags.once) {
                    emitter.removeEventListener(name, wrapListener);
                  }
                  listener(arg);
                });
              } else {
                throw new TypeError('The "emitter" argument must be of type EventEmitter. Received type ' + typeof emitter);
              }
            }

            },{}],5:[function(require,module,exports){
            /*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
            exports.read = function (buffer, offset, isLE, mLen, nBytes) {
              var e, m
              var eLen = (nBytes * 8) - mLen - 1
              var eMax = (1 << eLen) - 1
              var eBias = eMax >> 1
              var nBits = -7
              var i = isLE ? (nBytes - 1) : 0
              var d = isLE ? -1 : 1
              var s = buffer[offset + i]

              i += d

              e = s & ((1 << (-nBits)) - 1)
              s >>= (-nBits)
              nBits += eLen
              for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}

              m = e & ((1 << (-nBits)) - 1)
              e >>= (-nBits)
              nBits += mLen
              for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}

              if (e === 0) {
                e = 1 - eBias
              } else if (e === eMax) {
                return m ? NaN : ((s ? -1 : 1) * Infinity)
              } else {
                m = m + Math.pow(2, mLen)
                e = e - eBias
              }
              return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
            }

            exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
              var e, m, c
              var eLen = (nBytes * 8) - mLen - 1
              var eMax = (1 << eLen) - 1
              var eBias = eMax >> 1
              var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
              var i = isLE ? 0 : (nBytes - 1)
              var d = isLE ? 1 : -1
              var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

              value = Math.abs(value)

              if (isNaN(value) || value === Infinity) {
                m = isNaN(value) ? 1 : 0
                e = eMax
              } else {
                e = Math.floor(Math.log(value) / Math.LN2)
                if (value * (c = Math.pow(2, -e)) < 1) {
                  e--
                  c *= 2
                }
                if (e + eBias >= 1) {
                  value += rt / c
                } else {
                  value += rt * Math.pow(2, 1 - eBias)
                }
                if (value * c >= 2) {
                  e++
                  c /= 2
                }

                if (e + eBias >= eMax) {
                  m = 0
                  e = eMax
                } else if (e + eBias >= 1) {
                  m = ((value * c) - 1) * Math.pow(2, mLen)
                  e = e + eBias
                } else {
                  m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
                  e = 0
                }
              }

              for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

              e = (e << mLen) | m
              eLen += mLen
              for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

              buffer[offset + i - d] |= s * 128
            }

            },{}],6:[function(require,module,exports){
            if (typeof Object.create === 'function') {
              // implementation from standard node.js 'util' module
              module.exports = function inherits(ctor, superCtor) {
                if (superCtor) {
                  ctor.super_ = superCtor
                  ctor.prototype = Object.create(superCtor.prototype, {
                    constructor: {
                      value: ctor,
                      enumerable: false,
                      writable: true,
                      configurable: true
                    }
                  })
                }
              };
            } else {
              // old school shim for old browsers
              module.exports = function inherits(ctor, superCtor) {
                if (superCtor) {
                  ctor.super_ = superCtor
                  var TempCtor = function () {}
                  TempCtor.prototype = superCtor.prototype
                  ctor.prototype = new TempCtor()
                  ctor.prototype.constructor = ctor
                }
              }
            }

            },{}],7:[function(require,module,exports){
            // shim for using process in browser
            var process = module.exports = {};

            // cached from whatever global is present so that test runners that stub it
            // don't break things.  But we need to wrap it in a try catch in case it is
            // wrapped in strict mode code which doesn't define any globals.  It's inside a
            // function because try/catches deoptimize in certain engines.

            var cachedSetTimeout;
            var cachedClearTimeout;

            function defaultSetTimout() {
                throw new Error('setTimeout has not been defined');
            }
            function defaultClearTimeout () {
                throw new Error('clearTimeout has not been defined');
            }
            (function () {
                try {
                    if (typeof setTimeout === 'function') {
                        cachedSetTimeout = setTimeout;
                    } else {
                        cachedSetTimeout = defaultSetTimout;
                    }
                } catch (e) {
                    cachedSetTimeout = defaultSetTimout;
                }
                try {
                    if (typeof clearTimeout === 'function') {
                        cachedClearTimeout = clearTimeout;
                    } else {
                        cachedClearTimeout = defaultClearTimeout;
                    }
                } catch (e) {
                    cachedClearTimeout = defaultClearTimeout;
                }
            } ())
            function runTimeout(fun) {
                if (cachedSetTimeout === setTimeout) {
                    //normal enviroments in sane situations
                    return setTimeout(fun, 0);
                }
                // if setTimeout wasn't available but was latter defined
                if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
                    cachedSetTimeout = setTimeout;
                    return setTimeout(fun, 0);
                }
                try {
                    // when when somebody has screwed with setTimeout but no I.E. maddness
                    return cachedSetTimeout(fun, 0);
                } catch(e){
                    try {
                        // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
                        return cachedSetTimeout.call(null, fun, 0);
                    } catch(e){
                        // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
                        return cachedSetTimeout.call(this, fun, 0);
                    }
                }


            }
            function runClearTimeout(marker) {
                if (cachedClearTimeout === clearTimeout) {
                    //normal enviroments in sane situations
                    return clearTimeout(marker);
                }
                // if clearTimeout wasn't available but was latter defined
                if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
                    cachedClearTimeout = clearTimeout;
                    return clearTimeout(marker);
                }
                try {
                    // when when somebody has screwed with setTimeout but no I.E. maddness
                    return cachedClearTimeout(marker);
                } catch (e){
                    try {
                        // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
                        return cachedClearTimeout.call(null, marker);
                    } catch (e){
                        // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
                        // Some versions of I.E. have different rules for clearTimeout vs setTimeout
                        return cachedClearTimeout.call(this, marker);
                    }
                }



            }
            var queue = [];
            var draining = false;
            var currentQueue;
            var queueIndex = -1;

            function cleanUpNextTick() {
                if (!draining || !currentQueue) {
                    return;
                }
                draining = false;
                if (currentQueue.length) {
                    queue = currentQueue.concat(queue);
                } else {
                    queueIndex = -1;
                }
                if (queue.length) {
                    drainQueue();
                }
            }

            function drainQueue() {
                if (draining) {
                    return;
                }
                var timeout = runTimeout(cleanUpNextTick);
                draining = true;

                var len = queue.length;
                while(len) {
                    currentQueue = queue;
                    queue = [];
                    while (++queueIndex < len) {
                        if (currentQueue) {
                            currentQueue[queueIndex].run();
                        }
                    }
                    queueIndex = -1;
                    len = queue.length;
                }
                currentQueue = null;
                draining = false;
                runClearTimeout(timeout);
            }

            process.nextTick = function (fun) {
                var args = new Array(arguments.length - 1);
                if (arguments.length > 1) {
                    for (var i = 1; i < arguments.length; i++) {
                        args[i - 1] = arguments[i];
                    }
                }
                queue.push(new Item(fun, args));
                if (queue.length === 1 && !draining) {
                    runTimeout(drainQueue);
                }
            };

            // v8 likes predictible objects
            function Item(fun, array) {
                this.fun = fun;
                this.array = array;
            }
            Item.prototype.run = function () {
                this.fun.apply(null, this.array);
            };
            process.title = 'browser';
            process.browser = true;
            process.env = {};
            process.argv = [];
            process.version = ''; // empty string to avoid regexp issues
            process.versions = {};

            function noop() {}

            process.on = noop;
            process.addListener = noop;
            process.once = noop;
            process.off = noop;
            process.removeListener = noop;
            process.removeAllListeners = noop;
            process.emit = noop;
            process.prependListener = noop;
            process.prependOnceListener = noop;

            process.listeners = function (name) { return [] }

            process.binding = function (name) {
                throw new Error('process.binding is not supported');
            };

            process.cwd = function () { return '/' };
            process.chdir = function (dir) {
                throw new Error('process.chdir is not supported');
            };
            process.umask = function() { return 0; };

            },{}],8:[function(require,module,exports){
            /*! safe-buffer. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */
            /* eslint-disable node/no-deprecated-api */
            var buffer = require('buffer')
            var Buffer = buffer.Buffer

            // alternative to using Object.keys for old browsers
            function copyProps (src, dst) {
              for (var key in src) {
                dst[key] = src[key]
              }
            }
            if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
              module.exports = buffer
            } else {
              // Copy properties from require('buffer')
              copyProps(buffer, exports)
              exports.Buffer = SafeBuffer
            }

            function SafeBuffer (arg, encodingOrOffset, length) {
              return Buffer(arg, encodingOrOffset, length)
            }

            SafeBuffer.prototype = Object.create(Buffer.prototype)

            // Copy static methods from Buffer
            copyProps(Buffer, SafeBuffer)

            SafeBuffer.from = function (arg, encodingOrOffset, length) {
              if (typeof arg === 'number') {
                throw new TypeError('Argument must not be a number')
              }
              return Buffer(arg, encodingOrOffset, length)
            }

            SafeBuffer.alloc = function (size, fill, encoding) {
              if (typeof size !== 'number') {
                throw new TypeError('Argument must be a number')
              }
              var buf = Buffer(size)
              if (fill !== undefined) {
                if (typeof encoding === 'string') {
                  buf.fill(fill, encoding)
                } else {
                  buf.fill(fill)
                }
              } else {
                buf.fill(0)
              }
              return buf
            }

            SafeBuffer.allocUnsafe = function (size) {
              if (typeof size !== 'number') {
                throw new TypeError('Argument must be a number')
              }
              return Buffer(size)
            }

            SafeBuffer.allocUnsafeSlow = function (size) {
              if (typeof size !== 'number') {
                throw new TypeError('Argument must be a number')
              }
              return buffer.SlowBuffer(size)
            }

            },{"buffer":3}],9:[function(require,module,exports){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.

            module.exports = Stream;

            var EE = require('events').EventEmitter;
            var inherits = require('inherits');

            inherits(Stream, EE);
            Stream.Readable = require('readable-stream/lib/_stream_readable.js');
            Stream.Writable = require('readable-stream/lib/_stream_writable.js');
            Stream.Duplex = require('readable-stream/lib/_stream_duplex.js');
            Stream.Transform = require('readable-stream/lib/_stream_transform.js');
            Stream.PassThrough = require('readable-stream/lib/_stream_passthrough.js');
            Stream.finished = require('readable-stream/lib/internal/streams/end-of-stream.js')
            Stream.pipeline = require('readable-stream/lib/internal/streams/pipeline.js')

            // Backwards-compat with node 0.4.x
            Stream.Stream = Stream;



            // old-style streams.  Note that the pipe method (the only relevant
            // part of this class) is overridden in the Readable class.

            function Stream() {
              EE.call(this);
            }

            Stream.prototype.pipe = function(dest, options) {
              var source = this;

              function ondata(chunk) {
                if (dest.writable) {
                  if (false === dest.write(chunk) && source.pause) {
                    source.pause();
                  }
                }
              }

              source.on('data', ondata);

              function ondrain() {
                if (source.readable && source.resume) {
                  source.resume();
                }
              }

              dest.on('drain', ondrain);

              // If the 'end' option is not supplied, dest.end() will be called when
              // source gets the 'end' or 'close' events.  Only dest.end() once.
              if (!dest._isStdio && (!options || options.end !== false)) {
                source.on('end', onend);
                source.on('close', onclose);
              }

              var didOnEnd = false;
              function onend() {
                if (didOnEnd) return;
                didOnEnd = true;

                dest.end();
              }


              function onclose() {
                if (didOnEnd) return;
                didOnEnd = true;

                if (typeof dest.destroy === 'function') dest.destroy();
              }

              // don't leave dangling pipes when there are errors.
              function onerror(er) {
                cleanup();
                if (EE.listenerCount(this, 'error') === 0) {
                  throw er; // Unhandled stream error in pipe.
                }
              }

              source.on('error', onerror);
              dest.on('error', onerror);

              // remove all the event listeners that were added.
              function cleanup() {
                source.removeListener('data', ondata);
                dest.removeListener('drain', ondrain);

                source.removeListener('end', onend);
                source.removeListener('close', onclose);

                source.removeListener('error', onerror);
                dest.removeListener('error', onerror);

                source.removeListener('end', cleanup);
                source.removeListener('close', cleanup);

                dest.removeListener('close', cleanup);
              }

              source.on('end', cleanup);
              source.on('close', cleanup);

              dest.on('close', cleanup);

              dest.emit('pipe', source);

              // Allow for unix-like usage: A.pipe(B).pipe(C)
              return dest;
            };

            },{"events":4,"inherits":6,"readable-stream/lib/_stream_duplex.js":11,"readable-stream/lib/_stream_passthrough.js":12,"readable-stream/lib/_stream_readable.js":13,"readable-stream/lib/_stream_transform.js":14,"readable-stream/lib/_stream_writable.js":15,"readable-stream/lib/internal/streams/end-of-stream.js":19,"readable-stream/lib/internal/streams/pipeline.js":21}],10:[function(require,module,exports){
            'use strict';

            function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; subClass.__proto__ = superClass; }

            var codes = {};

            function createErrorType(code, message, Base) {
              if (!Base) {
                Base = Error;
              }

              function getMessage(arg1, arg2, arg3) {
                if (typeof message === 'string') {
                  return message;
                } else {
                  return message(arg1, arg2, arg3);
                }
              }

              var NodeError =
              /*#__PURE__*/
              function (_Base) {
                _inheritsLoose(NodeError, _Base);

                function NodeError(arg1, arg2, arg3) {
                  return _Base.call(this, getMessage(arg1, arg2, arg3)) || this;
                }

                return NodeError;
              }(Base);

              NodeError.prototype.name = Base.name;
              NodeError.prototype.code = code;
              codes[code] = NodeError;
            } // https://github.com/nodejs/node/blob/v10.8.0/lib/internal/errors.js


            function oneOf(expected, thing) {
              if (Array.isArray(expected)) {
                var len = expected.length;
                expected = expected.map(function (i) {
                  return String(i);
                });

                if (len > 2) {
                  return "one of ".concat(thing, " ").concat(expected.slice(0, len - 1).join(', '), ", or ") + expected[len - 1];
                } else if (len === 2) {
                  return "one of ".concat(thing, " ").concat(expected[0], " or ").concat(expected[1]);
                } else {
                  return "of ".concat(thing, " ").concat(expected[0]);
                }
              } else {
                return "of ".concat(thing, " ").concat(String(expected));
              }
            } // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith


            function startsWith(str, search, pos) {
              return str.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
            } // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith


            function endsWith(str, search, this_len) {
              if (this_len === undefined || this_len > str.length) {
                this_len = str.length;
              }

              return str.substring(this_len - search.length, this_len) === search;
            } // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes


            function includes(str, search, start) {
              if (typeof start !== 'number') {
                start = 0;
              }

              if (start + search.length > str.length) {
                return false;
              } else {
                return str.indexOf(search, start) !== -1;
              }
            }

            createErrorType('ERR_INVALID_OPT_VALUE', function (name, value) {
              return 'The value "' + value + '" is invalid for option "' + name + '"';
            }, TypeError);
            createErrorType('ERR_INVALID_ARG_TYPE', function (name, expected, actual) {
              // determiner: 'must be' or 'must not be'
              var determiner;

              if (typeof expected === 'string' && startsWith(expected, 'not ')) {
                determiner = 'must not be';
                expected = expected.replace(/^not /, '');
              } else {
                determiner = 'must be';
              }

              var msg;

              if (endsWith(name, ' argument')) {
                // For cases like 'first argument'
                msg = "The ".concat(name, " ").concat(determiner, " ").concat(oneOf(expected, 'type'));
              } else {
                var type = includes(name, '.') ? 'property' : 'argument';
                msg = "The \"".concat(name, "\" ").concat(type, " ").concat(determiner, " ").concat(oneOf(expected, 'type'));
              }

              msg += ". Received type ".concat(typeof actual);
              return msg;
            }, TypeError);
            createErrorType('ERR_STREAM_PUSH_AFTER_EOF', 'stream.push() after EOF');
            createErrorType('ERR_METHOD_NOT_IMPLEMENTED', function (name) {
              return 'The ' + name + ' method is not implemented';
            });
            createErrorType('ERR_STREAM_PREMATURE_CLOSE', 'Premature close');
            createErrorType('ERR_STREAM_DESTROYED', function (name) {
              return 'Cannot call ' + name + ' after a stream was destroyed';
            });
            createErrorType('ERR_MULTIPLE_CALLBACK', 'Callback called multiple times');
            createErrorType('ERR_STREAM_CANNOT_PIPE', 'Cannot pipe, not readable');
            createErrorType('ERR_STREAM_WRITE_AFTER_END', 'write after end');
            createErrorType('ERR_STREAM_NULL_VALUES', 'May not write null values to stream', TypeError);
            createErrorType('ERR_UNKNOWN_ENCODING', function (arg) {
              return 'Unknown encoding: ' + arg;
            }, TypeError);
            createErrorType('ERR_STREAM_UNSHIFT_AFTER_END_EVENT', 'stream.unshift() after end event');
            module.exports.codes = codes;

            },{}],11:[function(require,module,exports){
            (function (process){(function (){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.
            // a duplex stream is just a stream that is both readable and writable.
            // Since JS doesn't have multiple prototypal inheritance, this class
            // prototypally inherits from Readable, and then parasitically from
            // Writable.
            'use strict';
            /*<replacement>*/

            var objectKeys = Object.keys || function (obj) {
              var keys = [];

              for (var key in obj) {
                keys.push(key);
              }

              return keys;
            };
            /*</replacement>*/


            module.exports = Duplex;

            var Readable = require('./_stream_readable');

            var Writable = require('./_stream_writable');

            require('inherits')(Duplex, Readable);

            {
              // Allow the keys array to be GC'ed.
              var keys = objectKeys(Writable.prototype);

              for (var v = 0; v < keys.length; v++) {
                var method = keys[v];
                if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
              }
            }

            function Duplex(options) {
              if (!(this instanceof Duplex)) return new Duplex(options);
              Readable.call(this, options);
              Writable.call(this, options);
              this.allowHalfOpen = true;

              if (options) {
                if (options.readable === false) this.readable = false;
                if (options.writable === false) this.writable = false;

                if (options.allowHalfOpen === false) {
                  this.allowHalfOpen = false;
                  this.once('end', onend);
                }
              }
            }

            Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._writableState.highWaterMark;
              }
            });
            Object.defineProperty(Duplex.prototype, 'writableBuffer', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._writableState && this._writableState.getBuffer();
              }
            });
            Object.defineProperty(Duplex.prototype, 'writableLength', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._writableState.length;
              }
            }); // the no-half-open enforcer

            function onend() {
              // If the writable side ended, then we're ok.
              if (this._writableState.ended) return; // no more data can be written.
              // But allow more writes to happen in this tick.

              process.nextTick(onEndNT, this);
            }

            function onEndNT(self) {
              self.end();
            }

            Object.defineProperty(Duplex.prototype, 'destroyed', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                if (this._readableState === undefined || this._writableState === undefined) {
                  return false;
                }

                return this._readableState.destroyed && this._writableState.destroyed;
              },
              set: function set(value) {
                // we ignore the value if the stream
                // has not been initialized yet
                if (this._readableState === undefined || this._writableState === undefined) {
                  return;
                } // backward compatibility, the user is explicitly
                // managing destroyed


                this._readableState.destroyed = value;
                this._writableState.destroyed = value;
              }
            });
            }).call(this)}).call(this,require('_process'))
            },{"./_stream_readable":13,"./_stream_writable":15,"_process":7,"inherits":6}],12:[function(require,module,exports){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.
            // a passthrough stream.
            // basically just the most minimal sort of Transform stream.
            // Every written chunk gets output as-is.
            'use strict';

            module.exports = PassThrough;

            var Transform = require('./_stream_transform');

            require('inherits')(PassThrough, Transform);

            function PassThrough(options) {
              if (!(this instanceof PassThrough)) return new PassThrough(options);
              Transform.call(this, options);
            }

            PassThrough.prototype._transform = function (chunk, encoding, cb) {
              cb(null, chunk);
            };
            },{"./_stream_transform":14,"inherits":6}],13:[function(require,module,exports){
            (function (process,global){(function (){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.
            'use strict';

            module.exports = Readable;
            /*<replacement>*/

            var Duplex;
            /*</replacement>*/

            Readable.ReadableState = ReadableState;
            /*<replacement>*/

            var EE = require('events').EventEmitter;

            var EElistenerCount = function EElistenerCount(emitter, type) {
              return emitter.listeners(type).length;
            };
            /*</replacement>*/

            /*<replacement>*/


            var Stream = require('./internal/streams/stream');
            /*</replacement>*/


            var Buffer = require('buffer').Buffer;

            var OurUint8Array = global.Uint8Array || function () {};

            function _uint8ArrayToBuffer(chunk) {
              return Buffer.from(chunk);
            }

            function _isUint8Array(obj) {
              return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
            }
            /*<replacement>*/


            var debugUtil = require('util');

            var debug;

            if (debugUtil && debugUtil.debuglog) {
              debug = debugUtil.debuglog('stream');
            } else {
              debug = function debug() {};
            }
            /*</replacement>*/


            var BufferList = require('./internal/streams/buffer_list');

            var destroyImpl = require('./internal/streams/destroy');

            var _require = require('./internal/streams/state'),
                getHighWaterMark = _require.getHighWaterMark;

            var _require$codes = require('../errors').codes,
                ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
                ERR_STREAM_PUSH_AFTER_EOF = _require$codes.ERR_STREAM_PUSH_AFTER_EOF,
                ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
                ERR_STREAM_UNSHIFT_AFTER_END_EVENT = _require$codes.ERR_STREAM_UNSHIFT_AFTER_END_EVENT; // Lazy loaded to improve the startup performance.


            var StringDecoder;
            var createReadableStreamAsyncIterator;
            var from;

            require('inherits')(Readable, Stream);

            var errorOrDestroy = destroyImpl.errorOrDestroy;
            var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];

            function prependListener(emitter, event, fn) {
              // Sadly this is not cacheable as some libraries bundle their own
              // event emitter implementation with them.
              if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn); // This is a hack to make sure that our error handler is attached before any
              // userland ones.  NEVER DO THIS. This is here only because this code needs
              // to continue to work with older versions of Node.js that do not include
              // the prependListener() method. The goal is to eventually remove this hack.

              if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (Array.isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
            }

            function ReadableState(options, stream, isDuplex) {
              Duplex = Duplex || require('./_stream_duplex');
              options = options || {}; // Duplex streams are both readable and writable, but share
              // the same options object.
              // However, some cases require setting options to different
              // values for the readable and the writable sides of the duplex stream.
              // These options can be provided separately as readableXXX and writableXXX.

              if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag. Used to make read(n) ignore n and to
              // make all the buffer merging and length checks go away

              this.objectMode = !!options.objectMode;
              if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode; // the point at which it stops calling _read() to fill the buffer
              // Note: 0 is a valid value, means "don't call _read preemptively ever"

              this.highWaterMark = getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex); // A linked list is used to store data chunks instead of an array because the
              // linked list can remove elements from the beginning faster than
              // array.shift()

              this.buffer = new BufferList();
              this.length = 0;
              this.pipes = null;
              this.pipesCount = 0;
              this.flowing = null;
              this.ended = false;
              this.endEmitted = false;
              this.reading = false; // a flag to be able to tell if the event 'readable'/'data' is emitted
              // immediately, or on a later tick.  We set this to true at first, because
              // any actions that shouldn't happen until "later" should generally also
              // not happen before the first read call.

              this.sync = true; // whenever we return null, then we set a flag to say
              // that we're awaiting a 'readable' event emission.

              this.needReadable = false;
              this.emittedReadable = false;
              this.readableListening = false;
              this.resumeScheduled = false;
              this.paused = true; // Should close be emitted on destroy. Defaults to true.

              this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'end' (and potentially 'finish')

              this.autoDestroy = !!options.autoDestroy; // has it been destroyed

              this.destroyed = false; // Crypto is kind of old and crusty.  Historically, its default string
              // encoding is 'binary' so we have to make this configurable.
              // Everything else in the universe uses 'utf8', though.

              this.defaultEncoding = options.defaultEncoding || 'utf8'; // the number of writers that are awaiting a drain event in .pipe()s

              this.awaitDrain = 0; // if true, a maybeReadMore has been scheduled

              this.readingMore = false;
              this.decoder = null;
              this.encoding = null;

              if (options.encoding) {
                if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
                this.decoder = new StringDecoder(options.encoding);
                this.encoding = options.encoding;
              }
            }

            function Readable(options) {
              Duplex = Duplex || require('./_stream_duplex');
              if (!(this instanceof Readable)) return new Readable(options); // Checking for a Stream.Duplex instance is faster here instead of inside
              // the ReadableState constructor, at least with V8 6.5

              var isDuplex = this instanceof Duplex;
              this._readableState = new ReadableState(options, this, isDuplex); // legacy

              this.readable = true;

              if (options) {
                if (typeof options.read === 'function') this._read = options.read;
                if (typeof options.destroy === 'function') this._destroy = options.destroy;
              }

              Stream.call(this);
            }

            Object.defineProperty(Readable.prototype, 'destroyed', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                if (this._readableState === undefined) {
                  return false;
                }

                return this._readableState.destroyed;
              },
              set: function set(value) {
                // we ignore the value if the stream
                // has not been initialized yet
                if (!this._readableState) {
                  return;
                } // backward compatibility, the user is explicitly
                // managing destroyed


                this._readableState.destroyed = value;
              }
            });
            Readable.prototype.destroy = destroyImpl.destroy;
            Readable.prototype._undestroy = destroyImpl.undestroy;

            Readable.prototype._destroy = function (err, cb) {
              cb(err);
            }; // Manually shove something into the read() buffer.
            // This returns true if the highWaterMark has not been hit yet,
            // similar to how Writable.write() returns true if you should
            // write() some more.


            Readable.prototype.push = function (chunk, encoding) {
              var state = this._readableState;
              var skipChunkCheck;

              if (!state.objectMode) {
                if (typeof chunk === 'string') {
                  encoding = encoding || state.defaultEncoding;

                  if (encoding !== state.encoding) {
                    chunk = Buffer.from(chunk, encoding);
                    encoding = '';
                  }

                  skipChunkCheck = true;
                }
              } else {
                skipChunkCheck = true;
              }

              return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
            }; // Unshift should *always* be something directly out of read()


            Readable.prototype.unshift = function (chunk) {
              return readableAddChunk(this, chunk, null, true, false);
            };

            function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
              debug('readableAddChunk', chunk);
              var state = stream._readableState;

              if (chunk === null) {
                state.reading = false;
                onEofChunk(stream, state);
              } else {
                var er;
                if (!skipChunkCheck) er = chunkInvalid(state, chunk);

                if (er) {
                  errorOrDestroy(stream, er);
                } else if (state.objectMode || chunk && chunk.length > 0) {
                  if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
                    chunk = _uint8ArrayToBuffer(chunk);
                  }

                  if (addToFront) {
                    if (state.endEmitted) errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());else addChunk(stream, state, chunk, true);
                  } else if (state.ended) {
                    errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());
                  } else if (state.destroyed) {
                    return false;
                  } else {
                    state.reading = false;

                    if (state.decoder && !encoding) {
                      chunk = state.decoder.write(chunk);
                      if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
                    } else {
                      addChunk(stream, state, chunk, false);
                    }
                  }
                } else if (!addToFront) {
                  state.reading = false;
                  maybeReadMore(stream, state);
                }
              } // We can push more data if we are below the highWaterMark.
              // Also, if we have no data yet, we can stand some more bytes.
              // This is to work around cases where hwm=0, such as the repl.


              return !state.ended && (state.length < state.highWaterMark || state.length === 0);
            }

            function addChunk(stream, state, chunk, addToFront) {
              if (state.flowing && state.length === 0 && !state.sync) {
                state.awaitDrain = 0;
                stream.emit('data', chunk);
              } else {
                // update the buffer info.
                state.length += state.objectMode ? 1 : chunk.length;
                if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
                if (state.needReadable) emitReadable(stream);
              }

              maybeReadMore(stream, state);
            }

            function chunkInvalid(state, chunk) {
              var er;

              if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
                er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
              }

              return er;
            }

            Readable.prototype.isPaused = function () {
              return this._readableState.flowing === false;
            }; // backwards compatibility.


            Readable.prototype.setEncoding = function (enc) {
              if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
              var decoder = new StringDecoder(enc);
              this._readableState.decoder = decoder; // If setEncoding(null), decoder.encoding equals utf8

              this._readableState.encoding = this._readableState.decoder.encoding; // Iterate over current buffer to convert already stored Buffers:

              var p = this._readableState.buffer.head;
              var content = '';

              while (p !== null) {
                content += decoder.write(p.data);
                p = p.next;
              }

              this._readableState.buffer.clear();

              if (content !== '') this._readableState.buffer.push(content);
              this._readableState.length = content.length;
              return this;
            }; // Don't raise the hwm > 1GB


            var MAX_HWM = 0x40000000;

            function computeNewHighWaterMark(n) {
              if (n >= MAX_HWM) {
                // TODO(ronag): Throw ERR_VALUE_OUT_OF_RANGE.
                n = MAX_HWM;
              } else {
                // Get the next highest power of 2 to prevent increasing hwm excessively in
                // tiny amounts
                n--;
                n |= n >>> 1;
                n |= n >>> 2;
                n |= n >>> 4;
                n |= n >>> 8;
                n |= n >>> 16;
                n++;
              }

              return n;
            } // This function is designed to be inlinable, so please take care when making
            // changes to the function body.


            function howMuchToRead(n, state) {
              if (n <= 0 || state.length === 0 && state.ended) return 0;
              if (state.objectMode) return 1;

              if (n !== n) {
                // Only flow one buffer at a time
                if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
              } // If we're asking for more than the current hwm, then raise the hwm.


              if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
              if (n <= state.length) return n; // Don't have enough

              if (!state.ended) {
                state.needReadable = true;
                return 0;
              }

              return state.length;
            } // you can override either this method, or the async _read(n) below.


            Readable.prototype.read = function (n) {
              debug('read', n);
              n = parseInt(n, 10);
              var state = this._readableState;
              var nOrig = n;
              if (n !== 0) state.emittedReadable = false; // if we're doing read(0) to trigger a readable event, but we
              // already have a bunch of data in the buffer, then just trigger
              // the 'readable' event and move on.

              if (n === 0 && state.needReadable && ((state.highWaterMark !== 0 ? state.length >= state.highWaterMark : state.length > 0) || state.ended)) {
                debug('read: emitReadable', state.length, state.ended);
                if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
                return null;
              }

              n = howMuchToRead(n, state); // if we've ended, and we're now clear, then finish it up.

              if (n === 0 && state.ended) {
                if (state.length === 0) endReadable(this);
                return null;
              } // All the actual chunk generation logic needs to be
              // *below* the call to _read.  The reason is that in certain
              // synthetic stream cases, such as passthrough streams, _read
              // may be a completely synchronous operation which may change
              // the state of the read buffer, providing enough data when
              // before there was *not* enough.
              //
              // So, the steps are:
              // 1. Figure out what the state of things will be after we do
              // a read from the buffer.
              //
              // 2. If that resulting state will trigger a _read, then call _read.
              // Note that this may be asynchronous, or synchronous.  Yes, it is
              // deeply ugly to write APIs this way, but that still doesn't mean
              // that the Readable class should behave improperly, as streams are
              // designed to be sync/async agnostic.
              // Take note if the _read call is sync or async (ie, if the read call
              // has returned yet), so that we know whether or not it's safe to emit
              // 'readable' etc.
              //
              // 3. Actually pull the requested chunks out of the buffer and return.
              // if we need a readable event, then we need to do some reading.


              var doRead = state.needReadable;
              debug('need readable', doRead); // if we currently have less than the highWaterMark, then also read some

              if (state.length === 0 || state.length - n < state.highWaterMark) {
                doRead = true;
                debug('length less than watermark', doRead);
              } // however, if we've ended, then there's no point, and if we're already
              // reading, then it's unnecessary.


              if (state.ended || state.reading) {
                doRead = false;
                debug('reading or ended', doRead);
              } else if (doRead) {
                debug('do read');
                state.reading = true;
                state.sync = true; // if the length is currently zero, then we *need* a readable event.

                if (state.length === 0) state.needReadable = true; // call internal read method

                this._read(state.highWaterMark);

                state.sync = false; // If _read pushed data synchronously, then `reading` will be false,
                // and we need to re-evaluate how much data we can return to the user.

                if (!state.reading) n = howMuchToRead(nOrig, state);
              }

              var ret;
              if (n > 0) ret = fromList(n, state);else ret = null;

              if (ret === null) {
                state.needReadable = state.length <= state.highWaterMark;
                n = 0;
              } else {
                state.length -= n;
                state.awaitDrain = 0;
              }

              if (state.length === 0) {
                // If we have nothing in the buffer, then we want to know
                // as soon as we *do* get something into the buffer.
                if (!state.ended) state.needReadable = true; // If we tried to read() past the EOF, then emit end on the next tick.

                if (nOrig !== n && state.ended) endReadable(this);
              }

              if (ret !== null) this.emit('data', ret);
              return ret;
            };

            function onEofChunk(stream, state) {
              debug('onEofChunk');
              if (state.ended) return;

              if (state.decoder) {
                var chunk = state.decoder.end();

                if (chunk && chunk.length) {
                  state.buffer.push(chunk);
                  state.length += state.objectMode ? 1 : chunk.length;
                }
              }

              state.ended = true;

              if (state.sync) {
                // if we are sync, wait until next tick to emit the data.
                // Otherwise we risk emitting data in the flow()
                // the readable code triggers during a read() call
                emitReadable(stream);
              } else {
                // emit 'readable' now to make sure it gets picked up.
                state.needReadable = false;

                if (!state.emittedReadable) {
                  state.emittedReadable = true;
                  emitReadable_(stream);
                }
              }
            } // Don't emit readable right away in sync mode, because this can trigger
            // another read() call => stack overflow.  This way, it might trigger
            // a nextTick recursion warning, but that's not so bad.


            function emitReadable(stream) {
              var state = stream._readableState;
              debug('emitReadable', state.needReadable, state.emittedReadable);
              state.needReadable = false;

              if (!state.emittedReadable) {
                debug('emitReadable', state.flowing);
                state.emittedReadable = true;
                process.nextTick(emitReadable_, stream);
              }
            }

            function emitReadable_(stream) {
              var state = stream._readableState;
              debug('emitReadable_', state.destroyed, state.length, state.ended);

              if (!state.destroyed && (state.length || state.ended)) {
                stream.emit('readable');
                state.emittedReadable = false;
              } // The stream needs another readable event if
              // 1. It is not flowing, as the flow mechanism will take
              //    care of it.
              // 2. It is not ended.
              // 3. It is below the highWaterMark, so we can schedule
              //    another readable later.


              state.needReadable = !state.flowing && !state.ended && state.length <= state.highWaterMark;
              flow(stream);
            } // at this point, the user has presumably seen the 'readable' event,
            // and called read() to consume some data.  that may have triggered
            // in turn another _read(n) call, in which case reading = true if
            // it's in progress.
            // However, if we're not ended, or reading, and the length < hwm,
            // then go ahead and try to read some more preemptively.


            function maybeReadMore(stream, state) {
              if (!state.readingMore) {
                state.readingMore = true;
                process.nextTick(maybeReadMore_, stream, state);
              }
            }

            function maybeReadMore_(stream, state) {
              // Attempt to read more data if we should.
              //
              // The conditions for reading more data are (one of):
              // - Not enough data buffered (state.length < state.highWaterMark). The loop
              //   is responsible for filling the buffer with enough data if such data
              //   is available. If highWaterMark is 0 and we are not in the flowing mode
              //   we should _not_ attempt to buffer any extra data. We'll get more data
              //   when the stream consumer calls read() instead.
              // - No data in the buffer, and the stream is in flowing mode. In this mode
              //   the loop below is responsible for ensuring read() is called. Failing to
              //   call read here would abort the flow and there's no other mechanism for
              //   continuing the flow if the stream consumer has just subscribed to the
              //   'data' event.
              //
              // In addition to the above conditions to keep reading data, the following
              // conditions prevent the data from being read:
              // - The stream has ended (state.ended).
              // - There is already a pending 'read' operation (state.reading). This is a
              //   case where the the stream has called the implementation defined _read()
              //   method, but they are processing the call asynchronously and have _not_
              //   called push() with new data. In this case we skip performing more
              //   read()s. The execution ends in this method again after the _read() ends
              //   up calling push() with more data.
              while (!state.reading && !state.ended && (state.length < state.highWaterMark || state.flowing && state.length === 0)) {
                var len = state.length;
                debug('maybeReadMore read 0');
                stream.read(0);
                if (len === state.length) // didn't get any data, stop spinning.
                  break;
              }

              state.readingMore = false;
            } // abstract method.  to be overridden in specific implementation classes.
            // call cb(er, data) where data is <= n in length.
            // for virtual (non-string, non-buffer) streams, "length" is somewhat
            // arbitrary, and perhaps not very meaningful.


            Readable.prototype._read = function (n) {
              errorOrDestroy(this, new ERR_METHOD_NOT_IMPLEMENTED('_read()'));
            };

            Readable.prototype.pipe = function (dest, pipeOpts) {
              var src = this;
              var state = this._readableState;

              switch (state.pipesCount) {
                case 0:
                  state.pipes = dest;
                  break;

                case 1:
                  state.pipes = [state.pipes, dest];
                  break;

                default:
                  state.pipes.push(dest);
                  break;
              }

              state.pipesCount += 1;
              debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
              var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
              var endFn = doEnd ? onend : unpipe;
              if (state.endEmitted) process.nextTick(endFn);else src.once('end', endFn);
              dest.on('unpipe', onunpipe);

              function onunpipe(readable, unpipeInfo) {
                debug('onunpipe');

                if (readable === src) {
                  if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
                    unpipeInfo.hasUnpiped = true;
                    cleanup();
                  }
                }
              }

              function onend() {
                debug('onend');
                dest.end();
              } // when the dest drains, it reduces the awaitDrain counter
              // on the source.  This would be more elegant with a .once()
              // handler in flow(), but adding and removing repeatedly is
              // too slow.


              var ondrain = pipeOnDrain(src);
              dest.on('drain', ondrain);
              var cleanedUp = false;

              function cleanup() {
                debug('cleanup'); // cleanup event handlers once the pipe is broken

                dest.removeListener('close', onclose);
                dest.removeListener('finish', onfinish);
                dest.removeListener('drain', ondrain);
                dest.removeListener('error', onerror);
                dest.removeListener('unpipe', onunpipe);
                src.removeListener('end', onend);
                src.removeListener('end', unpipe);
                src.removeListener('data', ondata);
                cleanedUp = true; // if the reader is waiting for a drain event from this
                // specific writer, then it would cause it to never start
                // flowing again.
                // So, if this is awaiting a drain, then we just call it now.
                // If we don't know, then assume that we are waiting for one.

                if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
              }

              src.on('data', ondata);

              function ondata(chunk) {
                debug('ondata');
                var ret = dest.write(chunk);
                debug('dest.write', ret);

                if (ret === false) {
                  // If the user unpiped during `dest.write()`, it is possible
                  // to get stuck in a permanently paused state if that write
                  // also returned false.
                  // => Check whether `dest` is still a piping destination.
                  if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
                    debug('false write response, pause', state.awaitDrain);
                    state.awaitDrain++;
                  }

                  src.pause();
                }
              } // if the dest has an error, then stop piping into it.
              // however, don't suppress the throwing behavior for this.


              function onerror(er) {
                debug('onerror', er);
                unpipe();
                dest.removeListener('error', onerror);
                if (EElistenerCount(dest, 'error') === 0) errorOrDestroy(dest, er);
              } // Make sure our error handler is attached before userland ones.


              prependListener(dest, 'error', onerror); // Both close and finish should trigger unpipe, but only once.

              function onclose() {
                dest.removeListener('finish', onfinish);
                unpipe();
              }

              dest.once('close', onclose);

              function onfinish() {
                debug('onfinish');
                dest.removeListener('close', onclose);
                unpipe();
              }

              dest.once('finish', onfinish);

              function unpipe() {
                debug('unpipe');
                src.unpipe(dest);
              } // tell the dest that it's being piped to


              dest.emit('pipe', src); // start the flow if it hasn't been started already.

              if (!state.flowing) {
                debug('pipe resume');
                src.resume();
              }

              return dest;
            };

            function pipeOnDrain(src) {
              return function pipeOnDrainFunctionResult() {
                var state = src._readableState;
                debug('pipeOnDrain', state.awaitDrain);
                if (state.awaitDrain) state.awaitDrain--;

                if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
                  state.flowing = true;
                  flow(src);
                }
              };
            }

            Readable.prototype.unpipe = function (dest) {
              var state = this._readableState;
              var unpipeInfo = {
                hasUnpiped: false
              }; // if we're not piping anywhere, then do nothing.

              if (state.pipesCount === 0) return this; // just one destination.  most common case.

              if (state.pipesCount === 1) {
                // passed in one, but it's not the right one.
                if (dest && dest !== state.pipes) return this;
                if (!dest) dest = state.pipes; // got a match.

                state.pipes = null;
                state.pipesCount = 0;
                state.flowing = false;
                if (dest) dest.emit('unpipe', this, unpipeInfo);
                return this;
              } // slow case. multiple pipe destinations.


              if (!dest) {
                // remove all.
                var dests = state.pipes;
                var len = state.pipesCount;
                state.pipes = null;
                state.pipesCount = 0;
                state.flowing = false;

                for (var i = 0; i < len; i++) {
                  dests[i].emit('unpipe', this, {
                    hasUnpiped: false
                  });
                }

                return this;
              } // try to find the right one.


              var index = indexOf(state.pipes, dest);
              if (index === -1) return this;
              state.pipes.splice(index, 1);
              state.pipesCount -= 1;
              if (state.pipesCount === 1) state.pipes = state.pipes[0];
              dest.emit('unpipe', this, unpipeInfo);
              return this;
            }; // set up data events if they are asked for
            // Ensure readable listeners eventually get something


            Readable.prototype.on = function (ev, fn) {
              var res = Stream.prototype.on.call(this, ev, fn);
              var state = this._readableState;

              if (ev === 'data') {
                // update readableListening so that resume() may be a no-op
                // a few lines down. This is needed to support once('readable').
                state.readableListening = this.listenerCount('readable') > 0; // Try start flowing on next tick if stream isn't explicitly paused

                if (state.flowing !== false) this.resume();
              } else if (ev === 'readable') {
                if (!state.endEmitted && !state.readableListening) {
                  state.readableListening = state.needReadable = true;
                  state.flowing = false;
                  state.emittedReadable = false;
                  debug('on readable', state.length, state.reading);

                  if (state.length) {
                    emitReadable(this);
                  } else if (!state.reading) {
                    process.nextTick(nReadingNextTick, this);
                  }
                }
              }

              return res;
            };

            Readable.prototype.addListener = Readable.prototype.on;

            Readable.prototype.removeListener = function (ev, fn) {
              var res = Stream.prototype.removeListener.call(this, ev, fn);

              if (ev === 'readable') {
                // We need to check if there is someone still listening to
                // readable and reset the state. However this needs to happen
                // after readable has been emitted but before I/O (nextTick) to
                // support once('readable', fn) cycles. This means that calling
                // resume within the same tick will have no
                // effect.
                process.nextTick(updateReadableListening, this);
              }

              return res;
            };

            Readable.prototype.removeAllListeners = function (ev) {
              var res = Stream.prototype.removeAllListeners.apply(this, arguments);

              if (ev === 'readable' || ev === undefined) {
                // We need to check if there is someone still listening to
                // readable and reset the state. However this needs to happen
                // after readable has been emitted but before I/O (nextTick) to
                // support once('readable', fn) cycles. This means that calling
                // resume within the same tick will have no
                // effect.
                process.nextTick(updateReadableListening, this);
              }

              return res;
            };

            function updateReadableListening(self) {
              var state = self._readableState;
              state.readableListening = self.listenerCount('readable') > 0;

              if (state.resumeScheduled && !state.paused) {
                // flowing needs to be set to true now, otherwise
                // the upcoming resume will not flow.
                state.flowing = true; // crude way to check if we should resume
              } else if (self.listenerCount('data') > 0) {
                self.resume();
              }
            }

            function nReadingNextTick(self) {
              debug('readable nexttick read 0');
              self.read(0);
            } // pause() and resume() are remnants of the legacy readable stream API
            // If the user uses them, then switch into old mode.


            Readable.prototype.resume = function () {
              var state = this._readableState;

              if (!state.flowing) {
                debug('resume'); // we flow only if there is no one listening
                // for readable, but we still have to call
                // resume()

                state.flowing = !state.readableListening;
                resume(this, state);
              }

              state.paused = false;
              return this;
            };

            function resume(stream, state) {
              if (!state.resumeScheduled) {
                state.resumeScheduled = true;
                process.nextTick(resume_, stream, state);
              }
            }

            function resume_(stream, state) {
              debug('resume', state.reading);

              if (!state.reading) {
                stream.read(0);
              }

              state.resumeScheduled = false;
              stream.emit('resume');
              flow(stream);
              if (state.flowing && !state.reading) stream.read(0);
            }

            Readable.prototype.pause = function () {
              debug('call pause flowing=%j', this._readableState.flowing);

              if (this._readableState.flowing !== false) {
                debug('pause');
                this._readableState.flowing = false;
                this.emit('pause');
              }

              this._readableState.paused = true;
              return this;
            };

            function flow(stream) {
              var state = stream._readableState;
              debug('flow', state.flowing);

              while (state.flowing && stream.read() !== null) {
                ;
              }
            } // wrap an old-style stream as the async data source.
            // This is *not* part of the readable stream interface.
            // It is an ugly unfortunate mess of history.


            Readable.prototype.wrap = function (stream) {
              var _this = this;

              var state = this._readableState;
              var paused = false;
              stream.on('end', function () {
                debug('wrapped end');

                if (state.decoder && !state.ended) {
                  var chunk = state.decoder.end();
                  if (chunk && chunk.length) _this.push(chunk);
                }

                _this.push(null);
              });
              stream.on('data', function (chunk) {
                debug('wrapped data');
                if (state.decoder) chunk = state.decoder.write(chunk); // don't skip over falsy values in objectMode

                if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;

                var ret = _this.push(chunk);

                if (!ret) {
                  paused = true;
                  stream.pause();
                }
              }); // proxy all the other methods.
              // important when wrapping filters and duplexes.

              for (var i in stream) {
                if (this[i] === undefined && typeof stream[i] === 'function') {
                  this[i] = function methodWrap(method) {
                    return function methodWrapReturnFunction() {
                      return stream[method].apply(stream, arguments);
                    };
                  }(i);
                }
              } // proxy certain important events.


              for (var n = 0; n < kProxyEvents.length; n++) {
                stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
              } // when we try to consume some more bytes, simply unpause the
              // underlying stream.


              this._read = function (n) {
                debug('wrapped _read', n);

                if (paused) {
                  paused = false;
                  stream.resume();
                }
              };

              return this;
            };

            if (typeof Symbol === 'function') {
              Readable.prototype[Symbol.asyncIterator] = function () {
                if (createReadableStreamAsyncIterator === undefined) {
                  createReadableStreamAsyncIterator = require('./internal/streams/async_iterator');
                }

                return createReadableStreamAsyncIterator(this);
              };
            }

            Object.defineProperty(Readable.prototype, 'readableHighWaterMark', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._readableState.highWaterMark;
              }
            });
            Object.defineProperty(Readable.prototype, 'readableBuffer', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._readableState && this._readableState.buffer;
              }
            });
            Object.defineProperty(Readable.prototype, 'readableFlowing', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._readableState.flowing;
              },
              set: function set(state) {
                if (this._readableState) {
                  this._readableState.flowing = state;
                }
              }
            }); // exposed for testing purposes only.

            Readable._fromList = fromList;
            Object.defineProperty(Readable.prototype, 'readableLength', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._readableState.length;
              }
            }); // Pluck off n bytes from an array of buffers.
            // Length is the combined lengths of all the buffers in the list.
            // This function is designed to be inlinable, so please take care when making
            // changes to the function body.

            function fromList(n, state) {
              // nothing buffered
              if (state.length === 0) return null;
              var ret;
              if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
                // read it all, truncate the list
                if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.first();else ret = state.buffer.concat(state.length);
                state.buffer.clear();
              } else {
                // read part of list
                ret = state.buffer.consume(n, state.decoder);
              }
              return ret;
            }

            function endReadable(stream) {
              var state = stream._readableState;
              debug('endReadable', state.endEmitted);

              if (!state.endEmitted) {
                state.ended = true;
                process.nextTick(endReadableNT, state, stream);
              }
            }

            function endReadableNT(state, stream) {
              debug('endReadableNT', state.endEmitted, state.length); // Check that we didn't get one last unshift.

              if (!state.endEmitted && state.length === 0) {
                state.endEmitted = true;
                stream.readable = false;
                stream.emit('end');

                if (state.autoDestroy) {
                  // In case of duplex streams we need a way to detect
                  // if the writable side is ready for autoDestroy as well
                  var wState = stream._writableState;

                  if (!wState || wState.autoDestroy && wState.finished) {
                    stream.destroy();
                  }
                }
              }
            }

            if (typeof Symbol === 'function') {
              Readable.from = function (iterable, opts) {
                if (from === undefined) {
                  from = require('./internal/streams/from');
                }

                return from(Readable, iterable, opts);
              };
            }

            function indexOf(xs, x) {
              for (var i = 0, l = xs.length; i < l; i++) {
                if (xs[i] === x) return i;
              }

              return -1;
            }
            }).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
            },{"../errors":10,"./_stream_duplex":11,"./internal/streams/async_iterator":16,"./internal/streams/buffer_list":17,"./internal/streams/destroy":18,"./internal/streams/from":20,"./internal/streams/state":22,"./internal/streams/stream":23,"_process":7,"buffer":3,"events":4,"inherits":6,"string_decoder/":24,"util":2}],14:[function(require,module,exports){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.
            // a transform stream is a readable/writable stream where you do
            // something with the data.  Sometimes it's called a "filter",
            // but that's not a great name for it, since that implies a thing where
            // some bits pass through, and others are simply ignored.  (That would
            // be a valid example of a transform, of course.)
            //
            // While the output is causally related to the input, it's not a
            // necessarily symmetric or synchronous transformation.  For example,
            // a zlib stream might take multiple plain-text writes(), and then
            // emit a single compressed chunk some time in the future.
            //
            // Here's how this works:
            //
            // The Transform stream has all the aspects of the readable and writable
            // stream classes.  When you write(chunk), that calls _write(chunk,cb)
            // internally, and returns false if there's a lot of pending writes
            // buffered up.  When you call read(), that calls _read(n) until
            // there's enough pending readable data buffered up.
            //
            // In a transform stream, the written data is placed in a buffer.  When
            // _read(n) is called, it transforms the queued up data, calling the
            // buffered _write cb's as it consumes chunks.  If consuming a single
            // written chunk would result in multiple output chunks, then the first
            // outputted bit calls the readcb, and subsequent chunks just go into
            // the read buffer, and will cause it to emit 'readable' if necessary.
            //
            // This way, back-pressure is actually determined by the reading side,
            // since _read has to be called to start processing a new chunk.  However,
            // a pathological inflate type of transform can cause excessive buffering
            // here.  For example, imagine a stream where every byte of input is
            // interpreted as an integer from 0-255, and then results in that many
            // bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
            // 1kb of data being output.  In this case, you could write a very small
            // amount of input, and end up with a very large amount of output.  In
            // such a pathological inflating mechanism, there'd be no way to tell
            // the system to stop doing the transform.  A single 4MB write could
            // cause the system to run out of memory.
            //
            // However, even in such a pathological case, only a single written chunk
            // would be consumed, and then the rest would wait (un-transformed) until
            // the results of the previous transformed chunk were consumed.
            'use strict';

            module.exports = Transform;

            var _require$codes = require('../errors').codes,
                ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
                ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,
                ERR_TRANSFORM_ALREADY_TRANSFORMING = _require$codes.ERR_TRANSFORM_ALREADY_TRANSFORMING,
                ERR_TRANSFORM_WITH_LENGTH_0 = _require$codes.ERR_TRANSFORM_WITH_LENGTH_0;

            var Duplex = require('./_stream_duplex');

            require('inherits')(Transform, Duplex);

            function afterTransform(er, data) {
              var ts = this._transformState;
              ts.transforming = false;
              var cb = ts.writecb;

              if (cb === null) {
                return this.emit('error', new ERR_MULTIPLE_CALLBACK());
              }

              ts.writechunk = null;
              ts.writecb = null;
              if (data != null) // single equals check for both `null` and `undefined`
                this.push(data);
              cb(er);
              var rs = this._readableState;
              rs.reading = false;

              if (rs.needReadable || rs.length < rs.highWaterMark) {
                this._read(rs.highWaterMark);
              }
            }

            function Transform(options) {
              if (!(this instanceof Transform)) return new Transform(options);
              Duplex.call(this, options);
              this._transformState = {
                afterTransform: afterTransform.bind(this),
                needTransform: false,
                transforming: false,
                writecb: null,
                writechunk: null,
                writeencoding: null
              }; // start out asking for a readable event once data is transformed.

              this._readableState.needReadable = true; // we have implemented the _read method, and done the other things
              // that Readable wants before the first _read call, so unset the
              // sync guard flag.

              this._readableState.sync = false;

              if (options) {
                if (typeof options.transform === 'function') this._transform = options.transform;
                if (typeof options.flush === 'function') this._flush = options.flush;
              } // When the writable side finishes, then flush out anything remaining.


              this.on('prefinish', prefinish);
            }

            function prefinish() {
              var _this = this;

              if (typeof this._flush === 'function' && !this._readableState.destroyed) {
                this._flush(function (er, data) {
                  done(_this, er, data);
                });
              } else {
                done(this, null, null);
              }
            }

            Transform.prototype.push = function (chunk, encoding) {
              this._transformState.needTransform = false;
              return Duplex.prototype.push.call(this, chunk, encoding);
            }; // This is the part where you do stuff!
            // override this function in implementation classes.
            // 'chunk' is an input chunk.
            //
            // Call `push(newChunk)` to pass along transformed output
            // to the readable side.  You may call 'push' zero or more times.
            //
            // Call `cb(err)` when you are done with this chunk.  If you pass
            // an error, then that'll put the hurt on the whole operation.  If you
            // never call cb(), then you'll never get another chunk.


            Transform.prototype._transform = function (chunk, encoding, cb) {
              cb(new ERR_METHOD_NOT_IMPLEMENTED('_transform()'));
            };

            Transform.prototype._write = function (chunk, encoding, cb) {
              var ts = this._transformState;
              ts.writecb = cb;
              ts.writechunk = chunk;
              ts.writeencoding = encoding;

              if (!ts.transforming) {
                var rs = this._readableState;
                if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
              }
            }; // Doesn't matter what the args are here.
            // _transform does all the work.
            // That we got here means that the readable side wants more data.


            Transform.prototype._read = function (n) {
              var ts = this._transformState;

              if (ts.writechunk !== null && !ts.transforming) {
                ts.transforming = true;

                this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
              } else {
                // mark that we need a transform, so that any data that comes in
                // will get processed, now that we've asked for it.
                ts.needTransform = true;
              }
            };

            Transform.prototype._destroy = function (err, cb) {
              Duplex.prototype._destroy.call(this, err, function (err2) {
                cb(err2);
              });
            };

            function done(stream, er, data) {
              if (er) return stream.emit('error', er);
              if (data != null) // single equals check for both `null` and `undefined`
                stream.push(data); // TODO(BridgeAR): Write a test for these two error cases
              // if there's nothing in the write buffer, then that means
              // that nothing more will ever be provided

              if (stream._writableState.length) throw new ERR_TRANSFORM_WITH_LENGTH_0();
              if (stream._transformState.transforming) throw new ERR_TRANSFORM_ALREADY_TRANSFORMING();
              return stream.push(null);
            }
            },{"../errors":10,"./_stream_duplex":11,"inherits":6}],15:[function(require,module,exports){
            (function (process,global){(function (){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.
            // A bit simpler than readable streams.
            // Implement an async ._write(chunk, encoding, cb), and it'll handle all
            // the drain event emission and buffering.
            'use strict';

            module.exports = Writable;
            /* <replacement> */

            function WriteReq(chunk, encoding, cb) {
              this.chunk = chunk;
              this.encoding = encoding;
              this.callback = cb;
              this.next = null;
            } // It seems a linked list but it is not
            // there will be only 2 of these for each stream


            function CorkedRequest(state) {
              var _this = this;

              this.next = null;
              this.entry = null;

              this.finish = function () {
                onCorkedFinish(_this, state);
              };
            }
            /* </replacement> */

            /*<replacement>*/


            var Duplex;
            /*</replacement>*/

            Writable.WritableState = WritableState;
            /*<replacement>*/

            var internalUtil = {
              deprecate: require('util-deprecate')
            };
            /*</replacement>*/

            /*<replacement>*/

            var Stream = require('./internal/streams/stream');
            /*</replacement>*/


            var Buffer = require('buffer').Buffer;

            var OurUint8Array = global.Uint8Array || function () {};

            function _uint8ArrayToBuffer(chunk) {
              return Buffer.from(chunk);
            }

            function _isUint8Array(obj) {
              return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
            }

            var destroyImpl = require('./internal/streams/destroy');

            var _require = require('./internal/streams/state'),
                getHighWaterMark = _require.getHighWaterMark;

            var _require$codes = require('../errors').codes,
                ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
                ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
                ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,
                ERR_STREAM_CANNOT_PIPE = _require$codes.ERR_STREAM_CANNOT_PIPE,
                ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED,
                ERR_STREAM_NULL_VALUES = _require$codes.ERR_STREAM_NULL_VALUES,
                ERR_STREAM_WRITE_AFTER_END = _require$codes.ERR_STREAM_WRITE_AFTER_END,
                ERR_UNKNOWN_ENCODING = _require$codes.ERR_UNKNOWN_ENCODING;

            var errorOrDestroy = destroyImpl.errorOrDestroy;

            require('inherits')(Writable, Stream);

            function nop() {}

            function WritableState(options, stream, isDuplex) {
              Duplex = Duplex || require('./_stream_duplex');
              options = options || {}; // Duplex streams are both readable and writable, but share
              // the same options object.
              // However, some cases require setting options to different
              // values for the readable and the writable sides of the duplex stream,
              // e.g. options.readableObjectMode vs. options.writableObjectMode, etc.

              if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag to indicate whether or not this stream
              // contains buffers or objects.

              this.objectMode = !!options.objectMode;
              if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode; // the point at which write() starts returning false
              // Note: 0 is a valid value, means that we always return false if
              // the entire buffer is not flushed immediately on write()

              this.highWaterMark = getHighWaterMark(this, options, 'writableHighWaterMark', isDuplex); // if _final has been called

              this.finalCalled = false; // drain event flag.

              this.needDrain = false; // at the start of calling end()

              this.ending = false; // when end() has been called, and returned

              this.ended = false; // when 'finish' is emitted

              this.finished = false; // has it been destroyed

              this.destroyed = false; // should we decode strings into buffers before passing to _write?
              // this is here so that some node-core streams can optimize string
              // handling at a lower level.

              var noDecode = options.decodeStrings === false;
              this.decodeStrings = !noDecode; // Crypto is kind of old and crusty.  Historically, its default string
              // encoding is 'binary' so we have to make this configurable.
              // Everything else in the universe uses 'utf8', though.

              this.defaultEncoding = options.defaultEncoding || 'utf8'; // not an actual buffer we keep track of, but a measurement
              // of how much we're waiting to get pushed to some underlying
              // socket or file.

              this.length = 0; // a flag to see when we're in the middle of a write.

              this.writing = false; // when true all writes will be buffered until .uncork() call

              this.corked = 0; // a flag to be able to tell if the onwrite cb is called immediately,
              // or on a later tick.  We set this to true at first, because any
              // actions that shouldn't happen until "later" should generally also
              // not happen before the first write call.

              this.sync = true; // a flag to know if we're processing previously buffered items, which
              // may call the _write() callback in the same tick, so that we don't
              // end up in an overlapped onwrite situation.

              this.bufferProcessing = false; // the callback that's passed to _write(chunk,cb)

              this.onwrite = function (er) {
                onwrite(stream, er);
              }; // the callback that the user supplies to write(chunk,encoding,cb)


              this.writecb = null; // the amount that is being written when _write is called.

              this.writelen = 0;
              this.bufferedRequest = null;
              this.lastBufferedRequest = null; // number of pending user-supplied write callbacks
              // this must be 0 before 'finish' can be emitted

              this.pendingcb = 0; // emit prefinish if the only thing we're waiting for is _write cbs
              // This is relevant for synchronous Transform streams

              this.prefinished = false; // True if the error was already emitted and should not be thrown again

              this.errorEmitted = false; // Should close be emitted on destroy. Defaults to true.

              this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'finish' (and potentially 'end')

              this.autoDestroy = !!options.autoDestroy; // count buffered requests

              this.bufferedRequestCount = 0; // allocate the first CorkedRequest, there is always
              // one allocated and free to use, and we maintain at most two

              this.corkedRequestsFree = new CorkedRequest(this);
            }

            WritableState.prototype.getBuffer = function getBuffer() {
              var current = this.bufferedRequest;
              var out = [];

              while (current) {
                out.push(current);
                current = current.next;
              }

              return out;
            };

            (function () {
              try {
                Object.defineProperty(WritableState.prototype, 'buffer', {
                  get: internalUtil.deprecate(function writableStateBufferGetter() {
                    return this.getBuffer();
                  }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
                });
              } catch (_) {}
            })(); // Test _writableState for inheritance to account for Duplex streams,
            // whose prototype chain only points to Readable.


            var realHasInstance;

            if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
              realHasInstance = Function.prototype[Symbol.hasInstance];
              Object.defineProperty(Writable, Symbol.hasInstance, {
                value: function value(object) {
                  if (realHasInstance.call(this, object)) return true;
                  if (this !== Writable) return false;
                  return object && object._writableState instanceof WritableState;
                }
              });
            } else {
              realHasInstance = function realHasInstance(object) {
                return object instanceof this;
              };
            }

            function Writable(options) {
              Duplex = Duplex || require('./_stream_duplex'); // Writable ctor is applied to Duplexes, too.
              // `realHasInstance` is necessary because using plain `instanceof`
              // would return false, as no `_writableState` property is attached.
              // Trying to use the custom `instanceof` for Writable here will also break the
              // Node.js LazyTransform implementation, which has a non-trivial getter for
              // `_writableState` that would lead to infinite recursion.
              // Checking for a Stream.Duplex instance is faster here instead of inside
              // the WritableState constructor, at least with V8 6.5

              var isDuplex = this instanceof Duplex;
              if (!isDuplex && !realHasInstance.call(Writable, this)) return new Writable(options);
              this._writableState = new WritableState(options, this, isDuplex); // legacy.

              this.writable = true;

              if (options) {
                if (typeof options.write === 'function') this._write = options.write;
                if (typeof options.writev === 'function') this._writev = options.writev;
                if (typeof options.destroy === 'function') this._destroy = options.destroy;
                if (typeof options.final === 'function') this._final = options.final;
              }

              Stream.call(this);
            } // Otherwise people can pipe Writable streams, which is just wrong.


            Writable.prototype.pipe = function () {
              errorOrDestroy(this, new ERR_STREAM_CANNOT_PIPE());
            };

            function writeAfterEnd(stream, cb) {
              var er = new ERR_STREAM_WRITE_AFTER_END(); // TODO: defer error events consistently everywhere, not just the cb

              errorOrDestroy(stream, er);
              process.nextTick(cb, er);
            } // Checks that a user-supplied chunk is valid, especially for the particular
            // mode the stream is in. Currently this means that `null` is never accepted
            // and undefined/non-string values are only allowed in object mode.


            function validChunk(stream, state, chunk, cb) {
              var er;

              if (chunk === null) {
                er = new ERR_STREAM_NULL_VALUES();
              } else if (typeof chunk !== 'string' && !state.objectMode) {
                er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer'], chunk);
              }

              if (er) {
                errorOrDestroy(stream, er);
                process.nextTick(cb, er);
                return false;
              }

              return true;
            }

            Writable.prototype.write = function (chunk, encoding, cb) {
              var state = this._writableState;
              var ret = false;

              var isBuf = !state.objectMode && _isUint8Array(chunk);

              if (isBuf && !Buffer.isBuffer(chunk)) {
                chunk = _uint8ArrayToBuffer(chunk);
              }

              if (typeof encoding === 'function') {
                cb = encoding;
                encoding = null;
              }

              if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
              if (typeof cb !== 'function') cb = nop;
              if (state.ending) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
                state.pendingcb++;
                ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
              }
              return ret;
            };

            Writable.prototype.cork = function () {
              this._writableState.corked++;
            };

            Writable.prototype.uncork = function () {
              var state = this._writableState;

              if (state.corked) {
                state.corked--;
                if (!state.writing && !state.corked && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
              }
            };

            Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
              // node::ParseEncoding() requires lower case.
              if (typeof encoding === 'string') encoding = encoding.toLowerCase();
              if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new ERR_UNKNOWN_ENCODING(encoding);
              this._writableState.defaultEncoding = encoding;
              return this;
            };

            Object.defineProperty(Writable.prototype, 'writableBuffer', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._writableState && this._writableState.getBuffer();
              }
            });

            function decodeChunk(state, chunk, encoding) {
              if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
                chunk = Buffer.from(chunk, encoding);
              }

              return chunk;
            }

            Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._writableState.highWaterMark;
              }
            }); // if we're already writing something, then just put this
            // in the queue, and wait our turn.  Otherwise, call _write
            // If we return false, then we need a drain event, so set that flag.

            function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
              if (!isBuf) {
                var newChunk = decodeChunk(state, chunk, encoding);

                if (chunk !== newChunk) {
                  isBuf = true;
                  encoding = 'buffer';
                  chunk = newChunk;
                }
              }

              var len = state.objectMode ? 1 : chunk.length;
              state.length += len;
              var ret = state.length < state.highWaterMark; // we must ensure that previous needDrain will not be reset to false.

              if (!ret) state.needDrain = true;

              if (state.writing || state.corked) {
                var last = state.lastBufferedRequest;
                state.lastBufferedRequest = {
                  chunk: chunk,
                  encoding: encoding,
                  isBuf: isBuf,
                  callback: cb,
                  next: null
                };

                if (last) {
                  last.next = state.lastBufferedRequest;
                } else {
                  state.bufferedRequest = state.lastBufferedRequest;
                }

                state.bufferedRequestCount += 1;
              } else {
                doWrite(stream, state, false, len, chunk, encoding, cb);
              }

              return ret;
            }

            function doWrite(stream, state, writev, len, chunk, encoding, cb) {
              state.writelen = len;
              state.writecb = cb;
              state.writing = true;
              state.sync = true;
              if (state.destroyed) state.onwrite(new ERR_STREAM_DESTROYED('write'));else if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
              state.sync = false;
            }

            function onwriteError(stream, state, sync, er, cb) {
              --state.pendingcb;

              if (sync) {
                // defer the callback if we are being called synchronously
                // to avoid piling up things on the stack
                process.nextTick(cb, er); // this can emit finish, and it will always happen
                // after error

                process.nextTick(finishMaybe, stream, state);
                stream._writableState.errorEmitted = true;
                errorOrDestroy(stream, er);
              } else {
                // the caller expect this to happen before if
                // it is async
                cb(er);
                stream._writableState.errorEmitted = true;
                errorOrDestroy(stream, er); // this can emit finish, but finish must
                // always follow error

                finishMaybe(stream, state);
              }
            }

            function onwriteStateUpdate(state) {
              state.writing = false;
              state.writecb = null;
              state.length -= state.writelen;
              state.writelen = 0;
            }

            function onwrite(stream, er) {
              var state = stream._writableState;
              var sync = state.sync;
              var cb = state.writecb;
              if (typeof cb !== 'function') throw new ERR_MULTIPLE_CALLBACK();
              onwriteStateUpdate(state);
              if (er) onwriteError(stream, state, sync, er, cb);else {
                // Check if we're actually ready to finish, but don't emit yet
                var finished = needFinish(state) || stream.destroyed;

                if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
                  clearBuffer(stream, state);
                }

                if (sync) {
                  process.nextTick(afterWrite, stream, state, finished, cb);
                } else {
                  afterWrite(stream, state, finished, cb);
                }
              }
            }

            function afterWrite(stream, state, finished, cb) {
              if (!finished) onwriteDrain(stream, state);
              state.pendingcb--;
              cb();
              finishMaybe(stream, state);
            } // Must force callback to be called on nextTick, so that we don't
            // emit 'drain' before the write() consumer gets the 'false' return
            // value, and has a chance to attach a 'drain' listener.


            function onwriteDrain(stream, state) {
              if (state.length === 0 && state.needDrain) {
                state.needDrain = false;
                stream.emit('drain');
              }
            } // if there's something in the buffer waiting, then process it


            function clearBuffer(stream, state) {
              state.bufferProcessing = true;
              var entry = state.bufferedRequest;

              if (stream._writev && entry && entry.next) {
                // Fast case, write everything using _writev()
                var l = state.bufferedRequestCount;
                var buffer = new Array(l);
                var holder = state.corkedRequestsFree;
                holder.entry = entry;
                var count = 0;
                var allBuffers = true;

                while (entry) {
                  buffer[count] = entry;
                  if (!entry.isBuf) allBuffers = false;
                  entry = entry.next;
                  count += 1;
                }

                buffer.allBuffers = allBuffers;
                doWrite(stream, state, true, state.length, buffer, '', holder.finish); // doWrite is almost always async, defer these to save a bit of time
                // as the hot path ends with doWrite

                state.pendingcb++;
                state.lastBufferedRequest = null;

                if (holder.next) {
                  state.corkedRequestsFree = holder.next;
                  holder.next = null;
                } else {
                  state.corkedRequestsFree = new CorkedRequest(state);
                }

                state.bufferedRequestCount = 0;
              } else {
                // Slow case, write chunks one-by-one
                while (entry) {
                  var chunk = entry.chunk;
                  var encoding = entry.encoding;
                  var cb = entry.callback;
                  var len = state.objectMode ? 1 : chunk.length;
                  doWrite(stream, state, false, len, chunk, encoding, cb);
                  entry = entry.next;
                  state.bufferedRequestCount--; // if we didn't call the onwrite immediately, then
                  // it means that we need to wait until it does.
                  // also, that means that the chunk and cb are currently
                  // being processed, so move the buffer counter past them.

                  if (state.writing) {
                    break;
                  }
                }

                if (entry === null) state.lastBufferedRequest = null;
              }

              state.bufferedRequest = entry;
              state.bufferProcessing = false;
            }

            Writable.prototype._write = function (chunk, encoding, cb) {
              cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()'));
            };

            Writable.prototype._writev = null;

            Writable.prototype.end = function (chunk, encoding, cb) {
              var state = this._writableState;

              if (typeof chunk === 'function') {
                cb = chunk;
                chunk = null;
                encoding = null;
              } else if (typeof encoding === 'function') {
                cb = encoding;
                encoding = null;
              }

              if (chunk !== null && chunk !== undefined) this.write(chunk, encoding); // .end() fully uncorks

              if (state.corked) {
                state.corked = 1;
                this.uncork();
              } // ignore unnecessary end() calls.


              if (!state.ending) endWritable(this, state, cb);
              return this;
            };

            Object.defineProperty(Writable.prototype, 'writableLength', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                return this._writableState.length;
              }
            });

            function needFinish(state) {
              return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
            }

            function callFinal(stream, state) {
              stream._final(function (err) {
                state.pendingcb--;

                if (err) {
                  errorOrDestroy(stream, err);
                }

                state.prefinished = true;
                stream.emit('prefinish');
                finishMaybe(stream, state);
              });
            }

            function prefinish(stream, state) {
              if (!state.prefinished && !state.finalCalled) {
                if (typeof stream._final === 'function' && !state.destroyed) {
                  state.pendingcb++;
                  state.finalCalled = true;
                  process.nextTick(callFinal, stream, state);
                } else {
                  state.prefinished = true;
                  stream.emit('prefinish');
                }
              }
            }

            function finishMaybe(stream, state) {
              var need = needFinish(state);

              if (need) {
                prefinish(stream, state);

                if (state.pendingcb === 0) {
                  state.finished = true;
                  stream.emit('finish');

                  if (state.autoDestroy) {
                    // In case of duplex streams we need a way to detect
                    // if the readable side is ready for autoDestroy as well
                    var rState = stream._readableState;

                    if (!rState || rState.autoDestroy && rState.endEmitted) {
                      stream.destroy();
                    }
                  }
                }
              }

              return need;
            }

            function endWritable(stream, state, cb) {
              state.ending = true;
              finishMaybe(stream, state);

              if (cb) {
                if (state.finished) process.nextTick(cb);else stream.once('finish', cb);
              }

              state.ended = true;
              stream.writable = false;
            }

            function onCorkedFinish(corkReq, state, err) {
              var entry = corkReq.entry;
              corkReq.entry = null;

              while (entry) {
                var cb = entry.callback;
                state.pendingcb--;
                cb(err);
                entry = entry.next;
              } // reuse the free corkReq.


              state.corkedRequestsFree.next = corkReq;
            }

            Object.defineProperty(Writable.prototype, 'destroyed', {
              // making it explicit this property is not enumerable
              // because otherwise some prototype manipulation in
              // userland will fail
              enumerable: false,
              get: function get() {
                if (this._writableState === undefined) {
                  return false;
                }

                return this._writableState.destroyed;
              },
              set: function set(value) {
                // we ignore the value if the stream
                // has not been initialized yet
                if (!this._writableState) {
                  return;
                } // backward compatibility, the user is explicitly
                // managing destroyed


                this._writableState.destroyed = value;
              }
            });
            Writable.prototype.destroy = destroyImpl.destroy;
            Writable.prototype._undestroy = destroyImpl.undestroy;

            Writable.prototype._destroy = function (err, cb) {
              cb(err);
            };
            }).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
            },{"../errors":10,"./_stream_duplex":11,"./internal/streams/destroy":18,"./internal/streams/state":22,"./internal/streams/stream":23,"_process":7,"buffer":3,"inherits":6,"util-deprecate":25}],16:[function(require,module,exports){
            (function (process){(function (){
            'use strict';

            var _Object$setPrototypeO;

            function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

            var finished = require('./end-of-stream');

            var kLastResolve = Symbol('lastResolve');
            var kLastReject = Symbol('lastReject');
            var kError = Symbol('error');
            var kEnded = Symbol('ended');
            var kLastPromise = Symbol('lastPromise');
            var kHandlePromise = Symbol('handlePromise');
            var kStream = Symbol('stream');

            function createIterResult(value, done) {
              return {
                value: value,
                done: done
              };
            }

            function readAndResolve(iter) {
              var resolve = iter[kLastResolve];

              if (resolve !== null) {
                var data = iter[kStream].read(); // we defer if data is null
                // we can be expecting either 'end' or
                // 'error'

                if (data !== null) {
                  iter[kLastPromise] = null;
                  iter[kLastResolve] = null;
                  iter[kLastReject] = null;
                  resolve(createIterResult(data, false));
                }
              }
            }

            function onReadable(iter) {
              // we wait for the next tick, because it might
              // emit an error with process.nextTick
              process.nextTick(readAndResolve, iter);
            }

            function wrapForNext(lastPromise, iter) {
              return function (resolve, reject) {
                lastPromise.then(function () {
                  if (iter[kEnded]) {
                    resolve(createIterResult(undefined, true));
                    return;
                  }

                  iter[kHandlePromise](resolve, reject);
                }, reject);
              };
            }

            var AsyncIteratorPrototype = Object.getPrototypeOf(function () {});
            var ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf((_Object$setPrototypeO = {
              get stream() {
                return this[kStream];
              },

              next: function next() {
                var _this = this;

                // if we have detected an error in the meanwhile
                // reject straight away
                var error = this[kError];

                if (error !== null) {
                  return Promise.reject(error);
                }

                if (this[kEnded]) {
                  return Promise.resolve(createIterResult(undefined, true));
                }

                if (this[kStream].destroyed) {
                  // We need to defer via nextTick because if .destroy(err) is
                  // called, the error will be emitted via nextTick, and
                  // we cannot guarantee that there is no error lingering around
                  // waiting to be emitted.
                  return new Promise(function (resolve, reject) {
                    process.nextTick(function () {
                      if (_this[kError]) {
                        reject(_this[kError]);
                      } else {
                        resolve(createIterResult(undefined, true));
                      }
                    });
                  });
                } // if we have multiple next() calls
                // we will wait for the previous Promise to finish
                // this logic is optimized to support for await loops,
                // where next() is only called once at a time


                var lastPromise = this[kLastPromise];
                var promise;

                if (lastPromise) {
                  promise = new Promise(wrapForNext(lastPromise, this));
                } else {
                  // fast path needed to support multiple this.push()
                  // without triggering the next() queue
                  var data = this[kStream].read();

                  if (data !== null) {
                    return Promise.resolve(createIterResult(data, false));
                  }

                  promise = new Promise(this[kHandlePromise]);
                }

                this[kLastPromise] = promise;
                return promise;
              }
            }, _defineProperty(_Object$setPrototypeO, Symbol.asyncIterator, function () {
              return this;
            }), _defineProperty(_Object$setPrototypeO, "return", function _return() {
              var _this2 = this;

              // destroy(err, cb) is a private API
              // we can guarantee we have that here, because we control the
              // Readable class this is attached to
              return new Promise(function (resolve, reject) {
                _this2[kStream].destroy(null, function (err) {
                  if (err) {
                    reject(err);
                    return;
                  }

                  resolve(createIterResult(undefined, true));
                });
              });
            }), _Object$setPrototypeO), AsyncIteratorPrototype);

            var createReadableStreamAsyncIterator = function createReadableStreamAsyncIterator(stream) {
              var _Object$create;

              var iterator = Object.create(ReadableStreamAsyncIteratorPrototype, (_Object$create = {}, _defineProperty(_Object$create, kStream, {
                value: stream,
                writable: true
              }), _defineProperty(_Object$create, kLastResolve, {
                value: null,
                writable: true
              }), _defineProperty(_Object$create, kLastReject, {
                value: null,
                writable: true
              }), _defineProperty(_Object$create, kError, {
                value: null,
                writable: true
              }), _defineProperty(_Object$create, kEnded, {
                value: stream._readableState.endEmitted,
                writable: true
              }), _defineProperty(_Object$create, kHandlePromise, {
                value: function value(resolve, reject) {
                  var data = iterator[kStream].read();

                  if (data) {
                    iterator[kLastPromise] = null;
                    iterator[kLastResolve] = null;
                    iterator[kLastReject] = null;
                    resolve(createIterResult(data, false));
                  } else {
                    iterator[kLastResolve] = resolve;
                    iterator[kLastReject] = reject;
                  }
                },
                writable: true
              }), _Object$create));
              iterator[kLastPromise] = null;
              finished(stream, function (err) {
                if (err && err.code !== 'ERR_STREAM_PREMATURE_CLOSE') {
                  var reject = iterator[kLastReject]; // reject if we are waiting for data in the Promise
                  // returned by next() and store the error

                  if (reject !== null) {
                    iterator[kLastPromise] = null;
                    iterator[kLastResolve] = null;
                    iterator[kLastReject] = null;
                    reject(err);
                  }

                  iterator[kError] = err;
                  return;
                }

                var resolve = iterator[kLastResolve];

                if (resolve !== null) {
                  iterator[kLastPromise] = null;
                  iterator[kLastResolve] = null;
                  iterator[kLastReject] = null;
                  resolve(createIterResult(undefined, true));
                }

                iterator[kEnded] = true;
              });
              stream.on('readable', onReadable.bind(null, iterator));
              return iterator;
            };

            module.exports = createReadableStreamAsyncIterator;
            }).call(this)}).call(this,require('_process'))
            },{"./end-of-stream":19,"_process":7}],17:[function(require,module,exports){
            'use strict';

            function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

            function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

            function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

            function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

            function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

            function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

            var _require = require('buffer'),
                Buffer = _require.Buffer;

            var _require2 = require('util'),
                inspect = _require2.inspect;

            var custom = inspect && inspect.custom || 'inspect';

            function copyBuffer(src, target, offset) {
              Buffer.prototype.copy.call(src, target, offset);
            }

            module.exports =
            /*#__PURE__*/
            function () {
              function BufferList() {
                _classCallCheck(this, BufferList);

                this.head = null;
                this.tail = null;
                this.length = 0;
              }

              _createClass(BufferList, [{
                key: "push",
                value: function push(v) {
                  var entry = {
                    data: v,
                    next: null
                  };
                  if (this.length > 0) this.tail.next = entry;else this.head = entry;
                  this.tail = entry;
                  ++this.length;
                }
              }, {
                key: "unshift",
                value: function unshift(v) {
                  var entry = {
                    data: v,
                    next: this.head
                  };
                  if (this.length === 0) this.tail = entry;
                  this.head = entry;
                  ++this.length;
                }
              }, {
                key: "shift",
                value: function shift() {
                  if (this.length === 0) return;
                  var ret = this.head.data;
                  if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
                  --this.length;
                  return ret;
                }
              }, {
                key: "clear",
                value: function clear() {
                  this.head = this.tail = null;
                  this.length = 0;
                }
              }, {
                key: "join",
                value: function join(s) {
                  if (this.length === 0) return '';
                  var p = this.head;
                  var ret = '' + p.data;

                  while (p = p.next) {
                    ret += s + p.data;
                  }

                  return ret;
                }
              }, {
                key: "concat",
                value: function concat(n) {
                  if (this.length === 0) return Buffer.alloc(0);
                  var ret = Buffer.allocUnsafe(n >>> 0);
                  var p = this.head;
                  var i = 0;

                  while (p) {
                    copyBuffer(p.data, ret, i);
                    i += p.data.length;
                    p = p.next;
                  }

                  return ret;
                } // Consumes a specified amount of bytes or characters from the buffered data.

              }, {
                key: "consume",
                value: function consume(n, hasStrings) {
                  var ret;

                  if (n < this.head.data.length) {
                    // `slice` is the same for buffers and strings.
                    ret = this.head.data.slice(0, n);
                    this.head.data = this.head.data.slice(n);
                  } else if (n === this.head.data.length) {
                    // First chunk is a perfect match.
                    ret = this.shift();
                  } else {
                    // Result spans more than one buffer.
                    ret = hasStrings ? this._getString(n) : this._getBuffer(n);
                  }

                  return ret;
                }
              }, {
                key: "first",
                value: function first() {
                  return this.head.data;
                } // Consumes a specified amount of characters from the buffered data.

              }, {
                key: "_getString",
                value: function _getString(n) {
                  var p = this.head;
                  var c = 1;
                  var ret = p.data;
                  n -= ret.length;

                  while (p = p.next) {
                    var str = p.data;
                    var nb = n > str.length ? str.length : n;
                    if (nb === str.length) ret += str;else ret += str.slice(0, n);
                    n -= nb;

                    if (n === 0) {
                      if (nb === str.length) {
                        ++c;
                        if (p.next) this.head = p.next;else this.head = this.tail = null;
                      } else {
                        this.head = p;
                        p.data = str.slice(nb);
                      }

                      break;
                    }

                    ++c;
                  }

                  this.length -= c;
                  return ret;
                } // Consumes a specified amount of bytes from the buffered data.

              }, {
                key: "_getBuffer",
                value: function _getBuffer(n) {
                  var ret = Buffer.allocUnsafe(n);
                  var p = this.head;
                  var c = 1;
                  p.data.copy(ret);
                  n -= p.data.length;

                  while (p = p.next) {
                    var buf = p.data;
                    var nb = n > buf.length ? buf.length : n;
                    buf.copy(ret, ret.length - n, 0, nb);
                    n -= nb;

                    if (n === 0) {
                      if (nb === buf.length) {
                        ++c;
                        if (p.next) this.head = p.next;else this.head = this.tail = null;
                      } else {
                        this.head = p;
                        p.data = buf.slice(nb);
                      }

                      break;
                    }

                    ++c;
                  }

                  this.length -= c;
                  return ret;
                } // Make sure the linked list only shows the minimal necessary information.

              }, {
                key: custom,
                value: function value(_, options) {
                  return inspect(this, _objectSpread({}, options, {
                    // Only inspect one level.
                    depth: 0,
                    // It should not recurse.
                    customInspect: false
                  }));
                }
              }]);

              return BufferList;
            }();
            },{"buffer":3,"util":2}],18:[function(require,module,exports){
            (function (process){(function (){
            'use strict'; // undocumented cb() API, needed for core, not for public API

            function destroy(err, cb) {
              var _this = this;

              var readableDestroyed = this._readableState && this._readableState.destroyed;
              var writableDestroyed = this._writableState && this._writableState.destroyed;

              if (readableDestroyed || writableDestroyed) {
                if (cb) {
                  cb(err);
                } else if (err) {
                  if (!this._writableState) {
                    process.nextTick(emitErrorNT, this, err);
                  } else if (!this._writableState.errorEmitted) {
                    this._writableState.errorEmitted = true;
                    process.nextTick(emitErrorNT, this, err);
                  }
                }

                return this;
              } // we set destroyed to true before firing error callbacks in order
              // to make it re-entrance safe in case destroy() is called within callbacks


              if (this._readableState) {
                this._readableState.destroyed = true;
              } // if this is a duplex stream mark the writable part as destroyed as well


              if (this._writableState) {
                this._writableState.destroyed = true;
              }

              this._destroy(err || null, function (err) {
                if (!cb && err) {
                  if (!_this._writableState) {
                    process.nextTick(emitErrorAndCloseNT, _this, err);
                  } else if (!_this._writableState.errorEmitted) {
                    _this._writableState.errorEmitted = true;
                    process.nextTick(emitErrorAndCloseNT, _this, err);
                  } else {
                    process.nextTick(emitCloseNT, _this);
                  }
                } else if (cb) {
                  process.nextTick(emitCloseNT, _this);
                  cb(err);
                } else {
                  process.nextTick(emitCloseNT, _this);
                }
              });

              return this;
            }

            function emitErrorAndCloseNT(self, err) {
              emitErrorNT(self, err);
              emitCloseNT(self);
            }

            function emitCloseNT(self) {
              if (self._writableState && !self._writableState.emitClose) return;
              if (self._readableState && !self._readableState.emitClose) return;
              self.emit('close');
            }

            function undestroy() {
              if (this._readableState) {
                this._readableState.destroyed = false;
                this._readableState.reading = false;
                this._readableState.ended = false;
                this._readableState.endEmitted = false;
              }

              if (this._writableState) {
                this._writableState.destroyed = false;
                this._writableState.ended = false;
                this._writableState.ending = false;
                this._writableState.finalCalled = false;
                this._writableState.prefinished = false;
                this._writableState.finished = false;
                this._writableState.errorEmitted = false;
              }
            }

            function emitErrorNT(self, err) {
              self.emit('error', err);
            }

            function errorOrDestroy(stream, err) {
              // We have tests that rely on errors being emitted
              // in the same tick, so changing this is semver major.
              // For now when you opt-in to autoDestroy we allow
              // the error to be emitted nextTick. In a future
              // semver major update we should change the default to this.
              var rState = stream._readableState;
              var wState = stream._writableState;
              if (rState && rState.autoDestroy || wState && wState.autoDestroy) stream.destroy(err);else stream.emit('error', err);
            }

            module.exports = {
              destroy: destroy,
              undestroy: undestroy,
              errorOrDestroy: errorOrDestroy
            };
            }).call(this)}).call(this,require('_process'))
            },{"_process":7}],19:[function(require,module,exports){
            // Ported from https://github.com/mafintosh/end-of-stream with
            // permission from the author, Mathias Buus (@mafintosh).
            'use strict';

            var ERR_STREAM_PREMATURE_CLOSE = require('../../../errors').codes.ERR_STREAM_PREMATURE_CLOSE;

            function once(callback) {
              var called = false;
              return function () {
                if (called) return;
                called = true;

                for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
                  args[_key] = arguments[_key];
                }

                callback.apply(this, args);
              };
            }

            function noop() {}

            function isRequest(stream) {
              return stream.setHeader && typeof stream.abort === 'function';
            }

            function eos(stream, opts, callback) {
              if (typeof opts === 'function') return eos(stream, null, opts);
              if (!opts) opts = {};
              callback = once(callback || noop);
              var readable = opts.readable || opts.readable !== false && stream.readable;
              var writable = opts.writable || opts.writable !== false && stream.writable;

              var onlegacyfinish = function onlegacyfinish() {
                if (!stream.writable) onfinish();
              };

              var writableEnded = stream._writableState && stream._writableState.finished;

              var onfinish = function onfinish() {
                writable = false;
                writableEnded = true;
                if (!readable) callback.call(stream);
              };

              var readableEnded = stream._readableState && stream._readableState.endEmitted;

              var onend = function onend() {
                readable = false;
                readableEnded = true;
                if (!writable) callback.call(stream);
              };

              var onerror = function onerror(err) {
                callback.call(stream, err);
              };

              var onclose = function onclose() {
                var err;

                if (readable && !readableEnded) {
                  if (!stream._readableState || !stream._readableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
                  return callback.call(stream, err);
                }

                if (writable && !writableEnded) {
                  if (!stream._writableState || !stream._writableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
                  return callback.call(stream, err);
                }
              };

              var onrequest = function onrequest() {
                stream.req.on('finish', onfinish);
              };

              if (isRequest(stream)) {
                stream.on('complete', onfinish);
                stream.on('abort', onclose);
                if (stream.req) onrequest();else stream.on('request', onrequest);
              } else if (writable && !stream._writableState) {
                // legacy streams
                stream.on('end', onlegacyfinish);
                stream.on('close', onlegacyfinish);
              }

              stream.on('end', onend);
              stream.on('finish', onfinish);
              if (opts.error !== false) stream.on('error', onerror);
              stream.on('close', onclose);
              return function () {
                stream.removeListener('complete', onfinish);
                stream.removeListener('abort', onclose);
                stream.removeListener('request', onrequest);
                if (stream.req) stream.req.removeListener('finish', onfinish);
                stream.removeListener('end', onlegacyfinish);
                stream.removeListener('close', onlegacyfinish);
                stream.removeListener('finish', onfinish);
                stream.removeListener('end', onend);
                stream.removeListener('error', onerror);
                stream.removeListener('close', onclose);
              };
            }

            module.exports = eos;
            },{"../../../errors":10}],20:[function(require,module,exports){
            module.exports = function () {
              throw new Error('Readable.from is not available in the browser')
            };

            },{}],21:[function(require,module,exports){
            // Ported from https://github.com/mafintosh/pump with
            // permission from the author, Mathias Buus (@mafintosh).
            'use strict';

            var eos;

            function once(callback) {
              var called = false;
              return function () {
                if (called) return;
                called = true;
                callback.apply(void 0, arguments);
              };
            }

            var _require$codes = require('../../../errors').codes,
                ERR_MISSING_ARGS = _require$codes.ERR_MISSING_ARGS,
                ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED;

            function noop(err) {
              // Rethrow the error if it exists to avoid swallowing it
              if (err) throw err;
            }

            function isRequest(stream) {
              return stream.setHeader && typeof stream.abort === 'function';
            }

            function destroyer(stream, reading, writing, callback) {
              callback = once(callback);
              var closed = false;
              stream.on('close', function () {
                closed = true;
              });
              if (eos === undefined) eos = require('./end-of-stream');
              eos(stream, {
                readable: reading,
                writable: writing
              }, function (err) {
                if (err) return callback(err);
                closed = true;
                callback();
              });
              var destroyed = false;
              return function (err) {
                if (closed) return;
                if (destroyed) return;
                destroyed = true; // request.destroy just do .end - .abort is what we want

                if (isRequest(stream)) return stream.abort();
                if (typeof stream.destroy === 'function') return stream.destroy();
                callback(err || new ERR_STREAM_DESTROYED('pipe'));
              };
            }

            function call(fn) {
              fn();
            }

            function pipe(from, to) {
              return from.pipe(to);
            }

            function popCallback(streams) {
              if (!streams.length) return noop;
              if (typeof streams[streams.length - 1] !== 'function') return noop;
              return streams.pop();
            }

            function pipeline() {
              for (var _len = arguments.length, streams = new Array(_len), _key = 0; _key < _len; _key++) {
                streams[_key] = arguments[_key];
              }

              var callback = popCallback(streams);
              if (Array.isArray(streams[0])) streams = streams[0];

              if (streams.length < 2) {
                throw new ERR_MISSING_ARGS('streams');
              }

              var error;
              var destroys = streams.map(function (stream, i) {
                var reading = i < streams.length - 1;
                var writing = i > 0;
                return destroyer(stream, reading, writing, function (err) {
                  if (!error) error = err;
                  if (err) destroys.forEach(call);
                  if (reading) return;
                  destroys.forEach(call);
                  callback(error);
                });
              });
              return streams.reduce(pipe);
            }

            module.exports = pipeline;
            },{"../../../errors":10,"./end-of-stream":19}],22:[function(require,module,exports){
            'use strict';

            var ERR_INVALID_OPT_VALUE = require('../../../errors').codes.ERR_INVALID_OPT_VALUE;

            function highWaterMarkFrom(options, isDuplex, duplexKey) {
              return options.highWaterMark != null ? options.highWaterMark : isDuplex ? options[duplexKey] : null;
            }

            function getHighWaterMark(state, options, duplexKey, isDuplex) {
              var hwm = highWaterMarkFrom(options, isDuplex, duplexKey);

              if (hwm != null) {
                if (!(isFinite(hwm) && Math.floor(hwm) === hwm) || hwm < 0) {
                  var name = isDuplex ? duplexKey : 'highWaterMark';
                  throw new ERR_INVALID_OPT_VALUE(name, hwm);
                }

                return Math.floor(hwm);
              } // Default value


              return state.objectMode ? 16 : 16 * 1024;
            }

            module.exports = {
              getHighWaterMark: getHighWaterMark
            };
            },{"../../../errors":10}],23:[function(require,module,exports){
            module.exports = require('events').EventEmitter;

            },{"events":4}],24:[function(require,module,exports){
            // Copyright Joyent, Inc. and other Node contributors.
            //
            // Permission is hereby granted, free of charge, to any person obtaining a
            // copy of this software and associated documentation files (the
            // "Software"), to deal in the Software without restriction, including
            // without limitation the rights to use, copy, modify, merge, publish,
            // distribute, sublicense, and/or sell copies of the Software, and to permit
            // persons to whom the Software is furnished to do so, subject to the
            // following conditions:
            //
            // The above copyright notice and this permission notice shall be included
            // in all copies or substantial portions of the Software.
            //
            // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
            // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
            // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
            // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
            // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
            // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
            // USE OR OTHER DEALINGS IN THE SOFTWARE.

            'use strict';

            /*<replacement>*/

            var Buffer = require('safe-buffer').Buffer;
            /*</replacement>*/

            var isEncoding = Buffer.isEncoding || function (encoding) {
              encoding = '' + encoding;
              switch (encoding && encoding.toLowerCase()) {
                case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
                  return true;
                default:
                  return false;
              }
            };

            function _normalizeEncoding(enc) {
              if (!enc) return 'utf8';
              var retried;
              while (true) {
                switch (enc) {
                  case 'utf8':
                  case 'utf-8':
                    return 'utf8';
                  case 'ucs2':
                  case 'ucs-2':
                  case 'utf16le':
                  case 'utf-16le':
                    return 'utf16le';
                  case 'latin1':
                  case 'binary':
                    return 'latin1';
                  case 'base64':
                  case 'ascii':
                  case 'hex':
                    return enc;
                  default:
                    if (retried) return; // undefined
                    enc = ('' + enc).toLowerCase();
                    retried = true;
                }
              }
            };

            // Do not cache `Buffer.isEncoding` when checking encoding names as some
            // modules monkey-patch it to support additional encodings
            function normalizeEncoding(enc) {
              var nenc = _normalizeEncoding(enc);
              if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
              return nenc || enc;
            }

            // StringDecoder provides an interface for efficiently splitting a series of
            // buffers into a series of JS strings without breaking apart multi-byte
            // characters.
            exports.StringDecoder = StringDecoder;
            function StringDecoder(encoding) {
              this.encoding = normalizeEncoding(encoding);
              var nb;
              switch (this.encoding) {
                case 'utf16le':
                  this.text = utf16Text;
                  this.end = utf16End;
                  nb = 4;
                  break;
                case 'utf8':
                  this.fillLast = utf8FillLast;
                  nb = 4;
                  break;
                case 'base64':
                  this.text = base64Text;
                  this.end = base64End;
                  nb = 3;
                  break;
                default:
                  this.write = simpleWrite;
                  this.end = simpleEnd;
                  return;
              }
              this.lastNeed = 0;
              this.lastTotal = 0;
              this.lastChar = Buffer.allocUnsafe(nb);
            }

            StringDecoder.prototype.write = function (buf) {
              if (buf.length === 0) return '';
              var r;
              var i;
              if (this.lastNeed) {
                r = this.fillLast(buf);
                if (r === undefined) return '';
                i = this.lastNeed;
                this.lastNeed = 0;
              } else {
                i = 0;
              }
              if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
              return r || '';
            };

            StringDecoder.prototype.end = utf8End;

            // Returns only complete characters in a Buffer
            StringDecoder.prototype.text = utf8Text;

            // Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
            StringDecoder.prototype.fillLast = function (buf) {
              if (this.lastNeed <= buf.length) {
                buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
                return this.lastChar.toString(this.encoding, 0, this.lastTotal);
              }
              buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
              this.lastNeed -= buf.length;
            };

            // Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
            // continuation byte. If an invalid byte is detected, -2 is returned.
            function utf8CheckByte(byte) {
              if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
              return byte >> 6 === 0x02 ? -1 : -2;
            }

            // Checks at most 3 bytes at the end of a Buffer in order to detect an
            // incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
            // needed to complete the UTF-8 character (if applicable) are returned.
            function utf8CheckIncomplete(self, buf, i) {
              var j = buf.length - 1;
              if (j < i) return 0;
              var nb = utf8CheckByte(buf[j]);
              if (nb >= 0) {
                if (nb > 0) self.lastNeed = nb - 1;
                return nb;
              }
              if (--j < i || nb === -2) return 0;
              nb = utf8CheckByte(buf[j]);
              if (nb >= 0) {
                if (nb > 0) self.lastNeed = nb - 2;
                return nb;
              }
              if (--j < i || nb === -2) return 0;
              nb = utf8CheckByte(buf[j]);
              if (nb >= 0) {
                if (nb > 0) {
                  if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
                }
                return nb;
              }
              return 0;
            }

            // Validates as many continuation bytes for a multi-byte UTF-8 character as
            // needed or are available. If we see a non-continuation byte where we expect
            // one, we "replace" the validated continuation bytes we've seen so far with
            // a single UTF-8 replacement character ('\ufffd'), to match v8's UTF-8 decoding
            // behavior. The continuation byte check is included three times in the case
            // where all of the continuation bytes for a character exist in the same buffer.
            // It is also done this way as a slight performance increase instead of using a
            // loop.
            function utf8CheckExtraBytes(self, buf, p) {
              if ((buf[0] & 0xC0) !== 0x80) {
                self.lastNeed = 0;
                return '\ufffd';
              }
              if (self.lastNeed > 1 && buf.length > 1) {
                if ((buf[1] & 0xC0) !== 0x80) {
                  self.lastNeed = 1;
                  return '\ufffd';
                }
                if (self.lastNeed > 2 && buf.length > 2) {
                  if ((buf[2] & 0xC0) !== 0x80) {
                    self.lastNeed = 2;
                    return '\ufffd';
                  }
                }
              }
            }

            // Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
            function utf8FillLast(buf) {
              var p = this.lastTotal - this.lastNeed;
              var r = utf8CheckExtraBytes(this, buf, p);
              if (r !== undefined) return r;
              if (this.lastNeed <= buf.length) {
                buf.copy(this.lastChar, p, 0, this.lastNeed);
                return this.lastChar.toString(this.encoding, 0, this.lastTotal);
              }
              buf.copy(this.lastChar, p, 0, buf.length);
              this.lastNeed -= buf.length;
            }

            // Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
            // partial character, the character's bytes are buffered until the required
            // number of bytes are available.
            function utf8Text(buf, i) {
              var total = utf8CheckIncomplete(this, buf, i);
              if (!this.lastNeed) return buf.toString('utf8', i);
              this.lastTotal = total;
              var end = buf.length - (total - this.lastNeed);
              buf.copy(this.lastChar, 0, end);
              return buf.toString('utf8', i, end);
            }

            // For UTF-8, a replacement character is added when ending on a partial
            // character.
            function utf8End(buf) {
              var r = buf && buf.length ? this.write(buf) : '';
              if (this.lastNeed) return r + '\ufffd';
              return r;
            }

            // UTF-16LE typically needs two bytes per character, but even if we have an even
            // number of bytes available, we need to check if we end on a leading/high
            // surrogate. In that case, we need to wait for the next two bytes in order to
            // decode the last character properly.
            function utf16Text(buf, i) {
              if ((buf.length - i) % 2 === 0) {
                var r = buf.toString('utf16le', i);
                if (r) {
                  var c = r.charCodeAt(r.length - 1);
                  if (c >= 0xD800 && c <= 0xDBFF) {
                    this.lastNeed = 2;
                    this.lastTotal = 4;
                    this.lastChar[0] = buf[buf.length - 2];
                    this.lastChar[1] = buf[buf.length - 1];
                    return r.slice(0, -1);
                  }
                }
                return r;
              }
              this.lastNeed = 1;
              this.lastTotal = 2;
              this.lastChar[0] = buf[buf.length - 1];
              return buf.toString('utf16le', i, buf.length - 1);
            }

            // For UTF-16LE we do not explicitly append special replacement characters if we
            // end on a partial character, we simply let v8 handle that.
            function utf16End(buf) {
              var r = buf && buf.length ? this.write(buf) : '';
              if (this.lastNeed) {
                var end = this.lastTotal - this.lastNeed;
                return r + this.lastChar.toString('utf16le', 0, end);
              }
              return r;
            }

            function base64Text(buf, i) {
              var n = (buf.length - i) % 3;
              if (n === 0) return buf.toString('base64', i);
              this.lastNeed = 3 - n;
              this.lastTotal = 3;
              if (n === 1) {
                this.lastChar[0] = buf[buf.length - 1];
              } else {
                this.lastChar[0] = buf[buf.length - 2];
                this.lastChar[1] = buf[buf.length - 1];
              }
              return buf.toString('base64', i, buf.length - n);
            }

            function base64End(buf) {
              var r = buf && buf.length ? this.write(buf) : '';
              if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
              return r;
            }

            // Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
            function simpleWrite(buf) {
              return buf.toString(this.encoding);
            }

            function simpleEnd(buf) {
              return buf && buf.length ? this.write(buf) : '';
            }
            },{"safe-buffer":8}],25:[function(require,module,exports){
            (function (global){(function (){

            /**
             * Module exports.
             */

            module.exports = deprecate;

            /**
             * Mark that a method should not be used.
             * Returns a modified function which warns once by default.
             *
             * If `localStorage.noDeprecation = true` is set, then it is a no-op.
             *
             * If `localStorage.throwDeprecation = true` is set, then deprecated functions
             * will throw an Error when invoked.
             *
             * If `localStorage.traceDeprecation = true` is set, then deprecated functions
             * will invoke `console.trace()` instead of `console.error()`.
             *
             * @param {Function} fn - the function to deprecate
             * @param {String} msg - the string to print to the console when `fn` is invoked
             * @returns {Function} a new "deprecated" version of `fn`
             * @api public
             */

            function deprecate (fn, msg) {
              if (config('noDeprecation')) {
                return fn;
              }

              var warned = false;
              function deprecated() {
                if (!warned) {
                  if (config('throwDeprecation')) {
                    throw new Error(msg);
                  } else if (config('traceDeprecation')) {
                    console.trace(msg);
                  } else {
                    console.warn(msg);
                  }
                  warned = true;
                }
                return fn.apply(this, arguments);
              }

              return deprecated;
            }

            /**
             * Checks `localStorage` for boolean values for the given `name`.
             *
             * @param {String} name
             * @returns {Boolean}
             * @api private
             */

            function config (name) {
              // accessing global.localStorage can trigger a DOMException in sandboxed iframes
              try {
                if (!global.localStorage) return false;
              } catch (_) {
                return false;
              }
              var val = global.localStorage[name];
              if (null == val) return false;
              return String(val).toLowerCase() === 'true';
            }

            }).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
            },{}],26:[function(require,module,exports){
            'use strict'
            var inherits = require('inherits')
            var MD5 = require('md5.js')
            var RIPEMD160 = require('ripemd160')
            var sha = require('sha.js')
            var Base = require('cipher-base')

            function Hash (hash) {
              Base.call(this, 'digest')

              this._hash = hash
            }

            inherits(Hash, Base)

            Hash.prototype._update = function (data) {
              this._hash.update(data)
            }

            Hash.prototype._final = function () {
              return this._hash.digest()
            }

            module.exports = function createHash (alg) {
              alg = alg.toLowerCase()
              if (alg === 'md5') return new MD5()
              if (alg === 'rmd160' || alg === 'ripemd160') return new RIPEMD160()

              return new Hash(sha(alg))
            }

            },{"cipher-base":27,"inherits":29,"md5.js":30,"ripemd160":46,"sha.js":49}],27:[function(require,module,exports){
            var Buffer = require('safe-buffer').Buffer
            var Transform = require('stream').Transform
            var StringDecoder = require('string_decoder').StringDecoder
            var inherits = require('inherits')

            function CipherBase (hashMode) {
              Transform.call(this)
              this.hashMode = typeof hashMode === 'string'
              if (this.hashMode) {
                this[hashMode] = this._finalOrDigest
              } else {
                this.final = this._finalOrDigest
              }
              if (this._final) {
                this.__final = this._final
                this._final = null
              }
              this._decoder = null
              this._encoding = null
            }
            inherits(CipherBase, Transform)

            CipherBase.prototype.update = function (data, inputEnc, outputEnc) {
              if (typeof data === 'string') {
                data = Buffer.from(data, inputEnc)
              }

              var outData = this._update(data)
              if (this.hashMode) return this

              if (outputEnc) {
                outData = this._toString(outData, outputEnc)
              }

              return outData
            }

            CipherBase.prototype.setAutoPadding = function () {}
            CipherBase.prototype.getAuthTag = function () {
              throw new Error('trying to get auth tag in unsupported state')
            }

            CipherBase.prototype.setAuthTag = function () {
              throw new Error('trying to set auth tag in unsupported state')
            }

            CipherBase.prototype.setAAD = function () {
              throw new Error('trying to set aad in unsupported state')
            }

            CipherBase.prototype._transform = function (data, _, next) {
              var err
              try {
                if (this.hashMode) {
                  this._update(data)
                } else {
                  this.push(this._update(data))
                }
              } catch (e) {
                err = e
              } finally {
                next(err)
              }
            }
            CipherBase.prototype._flush = function (done) {
              var err
              try {
                this.push(this.__final())
              } catch (e) {
                err = e
              }

              done(err)
            }
            CipherBase.prototype._finalOrDigest = function (outputEnc) {
              var outData = this.__final() || Buffer.alloc(0)
              if (outputEnc) {
                outData = this._toString(outData, outputEnc, true)
              }
              return outData
            }

            CipherBase.prototype._toString = function (value, enc, fin) {
              if (!this._decoder) {
                this._decoder = new StringDecoder(enc)
                this._encoding = enc
              }

              if (this._encoding !== enc) throw new Error('can\'t switch encodings')

              var out = this._decoder.write(value)
              if (fin) {
                out += this._decoder.end()
              }

              return out
            }

            module.exports = CipherBase

            },{"inherits":29,"safe-buffer":47,"stream":9,"string_decoder":24}],28:[function(require,module,exports){
            'use strict'
            var Buffer = require('safe-buffer').Buffer
            var Transform = require('readable-stream').Transform
            var inherits = require('inherits')

            function throwIfNotStringOrBuffer (val, prefix) {
              if (!Buffer.isBuffer(val) && typeof val !== 'string') {
                throw new TypeError(prefix + ' must be a string or a buffer')
              }
            }

            function HashBase (blockSize) {
              Transform.call(this)

              this._block = Buffer.allocUnsafe(blockSize)
              this._blockSize = blockSize
              this._blockOffset = 0
              this._length = [0, 0, 0, 0]

              this._finalized = false
            }

            inherits(HashBase, Transform)

            HashBase.prototype._transform = function (chunk, encoding, callback) {
              var error = null
              try {
                this.update(chunk, encoding)
              } catch (err) {
                error = err
              }

              callback(error)
            }

            HashBase.prototype._flush = function (callback) {
              var error = null
              try {
                this.push(this.digest())
              } catch (err) {
                error = err
              }

              callback(error)
            }

            HashBase.prototype.update = function (data, encoding) {
              throwIfNotStringOrBuffer(data, 'Data')
              if (this._finalized) throw new Error('Digest already called')
              if (!Buffer.isBuffer(data)) data = Buffer.from(data, encoding)

              // consume data
              var block = this._block
              var offset = 0
              while (this._blockOffset + data.length - offset >= this._blockSize) {
                for (var i = this._blockOffset; i < this._blockSize;) block[i++] = data[offset++]
                this._update()
                this._blockOffset = 0
              }
              while (offset < data.length) block[this._blockOffset++] = data[offset++]

              // update length
              for (var j = 0, carry = data.length * 8; carry > 0; ++j) {
                this._length[j] += carry
                carry = (this._length[j] / 0x0100000000) | 0
                if (carry > 0) this._length[j] -= 0x0100000000 * carry
              }

              return this
            }

            HashBase.prototype._update = function () {
              throw new Error('_update is not implemented')
            }

            HashBase.prototype.digest = function (encoding) {
              if (this._finalized) throw new Error('Digest already called')
              this._finalized = true

              var digest = this._digest()
              if (encoding !== undefined) digest = digest.toString(encoding)

              // reset state
              this._block.fill(0)
              this._blockOffset = 0
              for (var i = 0; i < 4; ++i) this._length[i] = 0

              return digest
            }

            HashBase.prototype._digest = function () {
              throw new Error('_digest is not implemented')
            }

            module.exports = HashBase

            },{"inherits":29,"readable-stream":45,"safe-buffer":47}],29:[function(require,module,exports){
            arguments[4][6][0].apply(exports,arguments)
            },{"dup":6}],30:[function(require,module,exports){
            'use strict'
            var inherits = require('inherits')
            var HashBase = require('hash-base')
            var Buffer = require('safe-buffer').Buffer

            var ARRAY16 = new Array(16)

            function MD5 () {
              HashBase.call(this, 64)

              // state
              this._a = 0x67452301
              this._b = 0xefcdab89
              this._c = 0x98badcfe
              this._d = 0x10325476
            }

            inherits(MD5, HashBase)

            MD5.prototype._update = function () {
              var M = ARRAY16
              for (var i = 0; i < 16; ++i) M[i] = this._block.readInt32LE(i * 4)

              var a = this._a
              var b = this._b
              var c = this._c
              var d = this._d

              a = fnF(a, b, c, d, M[0], 0xd76aa478, 7)
              d = fnF(d, a, b, c, M[1], 0xe8c7b756, 12)
              c = fnF(c, d, a, b, M[2], 0x242070db, 17)
              b = fnF(b, c, d, a, M[3], 0xc1bdceee, 22)
              a = fnF(a, b, c, d, M[4], 0xf57c0faf, 7)
              d = fnF(d, a, b, c, M[5], 0x4787c62a, 12)
              c = fnF(c, d, a, b, M[6], 0xa8304613, 17)
              b = fnF(b, c, d, a, M[7], 0xfd469501, 22)
              a = fnF(a, b, c, d, M[8], 0x698098d8, 7)
              d = fnF(d, a, b, c, M[9], 0x8b44f7af, 12)
              c = fnF(c, d, a, b, M[10], 0xffff5bb1, 17)
              b = fnF(b, c, d, a, M[11], 0x895cd7be, 22)
              a = fnF(a, b, c, d, M[12], 0x6b901122, 7)
              d = fnF(d, a, b, c, M[13], 0xfd987193, 12)
              c = fnF(c, d, a, b, M[14], 0xa679438e, 17)
              b = fnF(b, c, d, a, M[15], 0x49b40821, 22)

              a = fnG(a, b, c, d, M[1], 0xf61e2562, 5)
              d = fnG(d, a, b, c, M[6], 0xc040b340, 9)
              c = fnG(c, d, a, b, M[11], 0x265e5a51, 14)
              b = fnG(b, c, d, a, M[0], 0xe9b6c7aa, 20)
              a = fnG(a, b, c, d, M[5], 0xd62f105d, 5)
              d = fnG(d, a, b, c, M[10], 0x02441453, 9)
              c = fnG(c, d, a, b, M[15], 0xd8a1e681, 14)
              b = fnG(b, c, d, a, M[4], 0xe7d3fbc8, 20)
              a = fnG(a, b, c, d, M[9], 0x21e1cde6, 5)
              d = fnG(d, a, b, c, M[14], 0xc33707d6, 9)
              c = fnG(c, d, a, b, M[3], 0xf4d50d87, 14)
              b = fnG(b, c, d, a, M[8], 0x455a14ed, 20)
              a = fnG(a, b, c, d, M[13], 0xa9e3e905, 5)
              d = fnG(d, a, b, c, M[2], 0xfcefa3f8, 9)
              c = fnG(c, d, a, b, M[7], 0x676f02d9, 14)
              b = fnG(b, c, d, a, M[12], 0x8d2a4c8a, 20)

              a = fnH(a, b, c, d, M[5], 0xfffa3942, 4)
              d = fnH(d, a, b, c, M[8], 0x8771f681, 11)
              c = fnH(c, d, a, b, M[11], 0x6d9d6122, 16)
              b = fnH(b, c, d, a, M[14], 0xfde5380c, 23)
              a = fnH(a, b, c, d, M[1], 0xa4beea44, 4)
              d = fnH(d, a, b, c, M[4], 0x4bdecfa9, 11)
              c = fnH(c, d, a, b, M[7], 0xf6bb4b60, 16)
              b = fnH(b, c, d, a, M[10], 0xbebfbc70, 23)
              a = fnH(a, b, c, d, M[13], 0x289b7ec6, 4)
              d = fnH(d, a, b, c, M[0], 0xeaa127fa, 11)
              c = fnH(c, d, a, b, M[3], 0xd4ef3085, 16)
              b = fnH(b, c, d, a, M[6], 0x04881d05, 23)
              a = fnH(a, b, c, d, M[9], 0xd9d4d039, 4)
              d = fnH(d, a, b, c, M[12], 0xe6db99e5, 11)
              c = fnH(c, d, a, b, M[15], 0x1fa27cf8, 16)
              b = fnH(b, c, d, a, M[2], 0xc4ac5665, 23)

              a = fnI(a, b, c, d, M[0], 0xf4292244, 6)
              d = fnI(d, a, b, c, M[7], 0x432aff97, 10)
              c = fnI(c, d, a, b, M[14], 0xab9423a7, 15)
              b = fnI(b, c, d, a, M[5], 0xfc93a039, 21)
              a = fnI(a, b, c, d, M[12], 0x655b59c3, 6)
              d = fnI(d, a, b, c, M[3], 0x8f0ccc92, 10)
              c = fnI(c, d, a, b, M[10], 0xffeff47d, 15)
              b = fnI(b, c, d, a, M[1], 0x85845dd1, 21)
              a = fnI(a, b, c, d, M[8], 0x6fa87e4f, 6)
              d = fnI(d, a, b, c, M[15], 0xfe2ce6e0, 10)
              c = fnI(c, d, a, b, M[6], 0xa3014314, 15)
              b = fnI(b, c, d, a, M[13], 0x4e0811a1, 21)
              a = fnI(a, b, c, d, M[4], 0xf7537e82, 6)
              d = fnI(d, a, b, c, M[11], 0xbd3af235, 10)
              c = fnI(c, d, a, b, M[2], 0x2ad7d2bb, 15)
              b = fnI(b, c, d, a, M[9], 0xeb86d391, 21)

              this._a = (this._a + a) | 0
              this._b = (this._b + b) | 0
              this._c = (this._c + c) | 0
              this._d = (this._d + d) | 0
            }

            MD5.prototype._digest = function () {
              // create padding and handle blocks
              this._block[this._blockOffset++] = 0x80
              if (this._blockOffset > 56) {
                this._block.fill(0, this._blockOffset, 64)
                this._update()
                this._blockOffset = 0
              }

              this._block.fill(0, this._blockOffset, 56)
              this._block.writeUInt32LE(this._length[0], 56)
              this._block.writeUInt32LE(this._length[1], 60)
              this._update()

              // produce result
              var buffer = Buffer.allocUnsafe(16)
              buffer.writeInt32LE(this._a, 0)
              buffer.writeInt32LE(this._b, 4)
              buffer.writeInt32LE(this._c, 8)
              buffer.writeInt32LE(this._d, 12)
              return buffer
            }

            function rotl (x, n) {
              return (x << n) | (x >>> (32 - n))
            }

            function fnF (a, b, c, d, m, k, s) {
              return (rotl((a + ((b & c) | ((~b) & d)) + m + k) | 0, s) + b) | 0
            }

            function fnG (a, b, c, d, m, k, s) {
              return (rotl((a + ((b & d) | (c & (~d))) + m + k) | 0, s) + b) | 0
            }

            function fnH (a, b, c, d, m, k, s) {
              return (rotl((a + (b ^ c ^ d) + m + k) | 0, s) + b) | 0
            }

            function fnI (a, b, c, d, m, k, s) {
              return (rotl((a + ((c ^ (b | (~d)))) + m + k) | 0, s) + b) | 0
            }

            module.exports = MD5

            },{"hash-base":28,"inherits":29,"safe-buffer":47}],31:[function(require,module,exports){
            arguments[4][10][0].apply(exports,arguments)
            },{"dup":10}],32:[function(require,module,exports){
            arguments[4][11][0].apply(exports,arguments)
            },{"./_stream_readable":34,"./_stream_writable":36,"_process":7,"dup":11,"inherits":29}],33:[function(require,module,exports){
            arguments[4][12][0].apply(exports,arguments)
            },{"./_stream_transform":35,"dup":12,"inherits":29}],34:[function(require,module,exports){
            arguments[4][13][0].apply(exports,arguments)
            },{"../errors":31,"./_stream_duplex":32,"./internal/streams/async_iterator":37,"./internal/streams/buffer_list":38,"./internal/streams/destroy":39,"./internal/streams/from":41,"./internal/streams/state":43,"./internal/streams/stream":44,"_process":7,"buffer":3,"dup":13,"events":4,"inherits":29,"string_decoder/":56,"util":2}],35:[function(require,module,exports){
            arguments[4][14][0].apply(exports,arguments)
            },{"../errors":31,"./_stream_duplex":32,"dup":14,"inherits":29}],36:[function(require,module,exports){
            arguments[4][15][0].apply(exports,arguments)
            },{"../errors":31,"./_stream_duplex":32,"./internal/streams/destroy":39,"./internal/streams/state":43,"./internal/streams/stream":44,"_process":7,"buffer":3,"dup":15,"inherits":29,"util-deprecate":57}],37:[function(require,module,exports){
            arguments[4][16][0].apply(exports,arguments)
            },{"./end-of-stream":40,"_process":7,"dup":16}],38:[function(require,module,exports){
            arguments[4][17][0].apply(exports,arguments)
            },{"buffer":3,"dup":17,"util":2}],39:[function(require,module,exports){
            arguments[4][18][0].apply(exports,arguments)
            },{"_process":7,"dup":18}],40:[function(require,module,exports){
            arguments[4][19][0].apply(exports,arguments)
            },{"../../../errors":31,"dup":19}],41:[function(require,module,exports){
            arguments[4][20][0].apply(exports,arguments)
            },{"dup":20}],42:[function(require,module,exports){
            arguments[4][21][0].apply(exports,arguments)
            },{"../../../errors":31,"./end-of-stream":40,"dup":21}],43:[function(require,module,exports){
            arguments[4][22][0].apply(exports,arguments)
            },{"../../../errors":31,"dup":22}],44:[function(require,module,exports){
            arguments[4][23][0].apply(exports,arguments)
            },{"dup":23,"events":4}],45:[function(require,module,exports){
            exports = module.exports = require('./lib/_stream_readable.js');
            exports.Stream = exports;
            exports.Readable = exports;
            exports.Writable = require('./lib/_stream_writable.js');
            exports.Duplex = require('./lib/_stream_duplex.js');
            exports.Transform = require('./lib/_stream_transform.js');
            exports.PassThrough = require('./lib/_stream_passthrough.js');
            exports.finished = require('./lib/internal/streams/end-of-stream.js');
            exports.pipeline = require('./lib/internal/streams/pipeline.js');

            },{"./lib/_stream_duplex.js":32,"./lib/_stream_passthrough.js":33,"./lib/_stream_readable.js":34,"./lib/_stream_transform.js":35,"./lib/_stream_writable.js":36,"./lib/internal/streams/end-of-stream.js":40,"./lib/internal/streams/pipeline.js":42}],46:[function(require,module,exports){
            'use strict'
            var Buffer = require('buffer').Buffer
            var inherits = require('inherits')
            var HashBase = require('hash-base')

            var ARRAY16 = new Array(16)

            var zl = [
              0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
              7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
              3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
              1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
              4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
            ]

            var zr = [
              5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
              6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
              15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
              8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
              12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
            ]

            var sl = [
              11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
              7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
              11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
              11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
              9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
            ]

            var sr = [
              8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
              9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
              9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
              15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
              8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
            ]

            var hl = [0x00000000, 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xa953fd4e]
            var hr = [0x50a28be6, 0x5c4dd124, 0x6d703ef3, 0x7a6d76e9, 0x00000000]

            function RIPEMD160 () {
              HashBase.call(this, 64)

              // state
              this._a = 0x67452301
              this._b = 0xefcdab89
              this._c = 0x98badcfe
              this._d = 0x10325476
              this._e = 0xc3d2e1f0
            }

            inherits(RIPEMD160, HashBase)

            RIPEMD160.prototype._update = function () {
              var words = ARRAY16
              for (var j = 0; j < 16; ++j) words[j] = this._block.readInt32LE(j * 4)

              var al = this._a | 0
              var bl = this._b | 0
              var cl = this._c | 0
              var dl = this._d | 0
              var el = this._e | 0

              var ar = this._a | 0
              var br = this._b | 0
              var cr = this._c | 0
              var dr = this._d | 0
              var er = this._e | 0

              // computation
              for (var i = 0; i < 80; i += 1) {
                var tl
                var tr
                if (i < 16) {
                  tl = fn1(al, bl, cl, dl, el, words[zl[i]], hl[0], sl[i])
                  tr = fn5(ar, br, cr, dr, er, words[zr[i]], hr[0], sr[i])
                } else if (i < 32) {
                  tl = fn2(al, bl, cl, dl, el, words[zl[i]], hl[1], sl[i])
                  tr = fn4(ar, br, cr, dr, er, words[zr[i]], hr[1], sr[i])
                } else if (i < 48) {
                  tl = fn3(al, bl, cl, dl, el, words[zl[i]], hl[2], sl[i])
                  tr = fn3(ar, br, cr, dr, er, words[zr[i]], hr[2], sr[i])
                } else if (i < 64) {
                  tl = fn4(al, bl, cl, dl, el, words[zl[i]], hl[3], sl[i])
                  tr = fn2(ar, br, cr, dr, er, words[zr[i]], hr[3], sr[i])
                } else { // if (i<80) {
                  tl = fn5(al, bl, cl, dl, el, words[zl[i]], hl[4], sl[i])
                  tr = fn1(ar, br, cr, dr, er, words[zr[i]], hr[4], sr[i])
                }

                al = el
                el = dl
                dl = rotl(cl, 10)
                cl = bl
                bl = tl

                ar = er
                er = dr
                dr = rotl(cr, 10)
                cr = br
                br = tr
              }

              // update state
              var t = (this._b + cl + dr) | 0
              this._b = (this._c + dl + er) | 0
              this._c = (this._d + el + ar) | 0
              this._d = (this._e + al + br) | 0
              this._e = (this._a + bl + cr) | 0
              this._a = t
            }

            RIPEMD160.prototype._digest = function () {
              // create padding and handle blocks
              this._block[this._blockOffset++] = 0x80
              if (this._blockOffset > 56) {
                this._block.fill(0, this._blockOffset, 64)
                this._update()
                this._blockOffset = 0
              }

              this._block.fill(0, this._blockOffset, 56)
              this._block.writeUInt32LE(this._length[0], 56)
              this._block.writeUInt32LE(this._length[1], 60)
              this._update()

              // produce result
              var buffer = Buffer.alloc ? Buffer.alloc(20) : new Buffer(20)
              buffer.writeInt32LE(this._a, 0)
              buffer.writeInt32LE(this._b, 4)
              buffer.writeInt32LE(this._c, 8)
              buffer.writeInt32LE(this._d, 12)
              buffer.writeInt32LE(this._e, 16)
              return buffer
            }

            function rotl (x, n) {
              return (x << n) | (x >>> (32 - n))
            }

            function fn1 (a, b, c, d, e, m, k, s) {
              return (rotl((a + (b ^ c ^ d) + m + k) | 0, s) + e) | 0
            }

            function fn2 (a, b, c, d, e, m, k, s) {
              return (rotl((a + ((b & c) | ((~b) & d)) + m + k) | 0, s) + e) | 0
            }

            function fn3 (a, b, c, d, e, m, k, s) {
              return (rotl((a + ((b | (~c)) ^ d) + m + k) | 0, s) + e) | 0
            }

            function fn4 (a, b, c, d, e, m, k, s) {
              return (rotl((a + ((b & d) | (c & (~d))) + m + k) | 0, s) + e) | 0
            }

            function fn5 (a, b, c, d, e, m, k, s) {
              return (rotl((a + (b ^ (c | (~d))) + m + k) | 0, s) + e) | 0
            }

            module.exports = RIPEMD160

            },{"buffer":3,"hash-base":28,"inherits":29}],47:[function(require,module,exports){
            arguments[4][8][0].apply(exports,arguments)
            },{"buffer":3,"dup":8}],48:[function(require,module,exports){
            var Buffer = require('safe-buffer').Buffer

            // prototype class for hash functions
            function Hash (blockSize, finalSize) {
              this._block = Buffer.alloc(blockSize)
              this._finalSize = finalSize
              this._blockSize = blockSize
              this._len = 0
            }

            Hash.prototype.update = function (data, enc) {
              if (typeof data === 'string') {
                enc = enc || 'utf8'
                data = Buffer.from(data, enc)
              }

              var block = this._block
              var blockSize = this._blockSize
              var length = data.length
              var accum = this._len

              for (var offset = 0; offset < length;) {
                var assigned = accum % blockSize
                var remainder = Math.min(length - offset, blockSize - assigned)

                for (var i = 0; i < remainder; i++) {
                  block[assigned + i] = data[offset + i]
                }

                accum += remainder
                offset += remainder

                if ((accum % blockSize) === 0) {
                  this._update(block)
                }
              }

              this._len += length
              return this
            }

            Hash.prototype.digest = function (enc) {
              var rem = this._len % this._blockSize

              this._block[rem] = 0x80

              // zero (rem + 1) trailing bits, where (rem + 1) is the smallest
              // non-negative solution to the equation (length + 1 + (rem + 1)) === finalSize mod blockSize
              this._block.fill(0, rem + 1)

              if (rem >= this._finalSize) {
                this._update(this._block)
                this._block.fill(0)
              }

              var bits = this._len * 8

              // uint32
              if (bits <= 0xffffffff) {
                this._block.writeUInt32BE(bits, this._blockSize - 4)

              // uint64
              } else {
                var lowBits = (bits & 0xffffffff) >>> 0
                var highBits = (bits - lowBits) / 0x100000000

                this._block.writeUInt32BE(highBits, this._blockSize - 8)
                this._block.writeUInt32BE(lowBits, this._blockSize - 4)
              }

              this._update(this._block)
              var hash = this._hash()

              return enc ? hash.toString(enc) : hash
            }

            Hash.prototype._update = function () {
              throw new Error('_update must be implemented by subclass')
            }

            module.exports = Hash

            },{"safe-buffer":47}],49:[function(require,module,exports){
            var exports = module.exports = function SHA (algorithm) {
              algorithm = algorithm.toLowerCase()

              var Algorithm = exports[algorithm]
              if (!Algorithm) throw new Error(algorithm + ' is not supported (we accept pull requests)')

              return new Algorithm()
            }

            exports.sha = require('./sha')
            exports.sha1 = require('./sha1')
            exports.sha224 = require('./sha224')
            exports.sha256 = require('./sha256')
            exports.sha384 = require('./sha384')
            exports.sha512 = require('./sha512')

            },{"./sha":50,"./sha1":51,"./sha224":52,"./sha256":53,"./sha384":54,"./sha512":55}],50:[function(require,module,exports){
            /*
             * A JavaScript implementation of the Secure Hash Algorithm, SHA-0, as defined
             * in FIPS PUB 180-1
             * This source code is derived from sha1.js of the same repository.
             * The difference between SHA-0 and SHA-1 is just a bitwise rotate left
             * operation was added.
             */

            var inherits = require('inherits')
            var Hash = require('./hash')
            var Buffer = require('safe-buffer').Buffer

            var K = [
              0x5a827999, 0x6ed9eba1, 0x8f1bbcdc | 0, 0xca62c1d6 | 0
            ]

            var W = new Array(80)

            function Sha () {
              this.init()
              this._w = W

              Hash.call(this, 64, 56)
            }

            inherits(Sha, Hash)

            Sha.prototype.init = function () {
              this._a = 0x67452301
              this._b = 0xefcdab89
              this._c = 0x98badcfe
              this._d = 0x10325476
              this._e = 0xc3d2e1f0

              return this
            }

            function rotl5 (num) {
              return (num << 5) | (num >>> 27)
            }

            function rotl30 (num) {
              return (num << 30) | (num >>> 2)
            }

            function ft (s, b, c, d) {
              if (s === 0) return (b & c) | ((~b) & d)
              if (s === 2) return (b & c) | (b & d) | (c & d)
              return b ^ c ^ d
            }

            Sha.prototype._update = function (M) {
              var W = this._w

              var a = this._a | 0
              var b = this._b | 0
              var c = this._c | 0
              var d = this._d | 0
              var e = this._e | 0

              for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
              for (; i < 80; ++i) W[i] = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16]

              for (var j = 0; j < 80; ++j) {
                var s = ~~(j / 20)
                var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0

                e = d
                d = c
                c = rotl30(b)
                b = a
                a = t
              }

              this._a = (a + this._a) | 0
              this._b = (b + this._b) | 0
              this._c = (c + this._c) | 0
              this._d = (d + this._d) | 0
              this._e = (e + this._e) | 0
            }

            Sha.prototype._hash = function () {
              var H = Buffer.allocUnsafe(20)

              H.writeInt32BE(this._a | 0, 0)
              H.writeInt32BE(this._b | 0, 4)
              H.writeInt32BE(this._c | 0, 8)
              H.writeInt32BE(this._d | 0, 12)
              H.writeInt32BE(this._e | 0, 16)

              return H
            }

            module.exports = Sha

            },{"./hash":48,"inherits":29,"safe-buffer":47}],51:[function(require,module,exports){
            /*
             * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
             * in FIPS PUB 180-1
             * Version 2.1a Copyright Paul Johnston 2000 - 2002.
             * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
             * Distributed under the BSD License
             * See http://pajhome.org.uk/crypt/md5 for details.
             */

            var inherits = require('inherits')
            var Hash = require('./hash')
            var Buffer = require('safe-buffer').Buffer

            var K = [
              0x5a827999, 0x6ed9eba1, 0x8f1bbcdc | 0, 0xca62c1d6 | 0
            ]

            var W = new Array(80)

            function Sha1 () {
              this.init()
              this._w = W

              Hash.call(this, 64, 56)
            }

            inherits(Sha1, Hash)

            Sha1.prototype.init = function () {
              this._a = 0x67452301
              this._b = 0xefcdab89
              this._c = 0x98badcfe
              this._d = 0x10325476
              this._e = 0xc3d2e1f0

              return this
            }

            function rotl1 (num) {
              return (num << 1) | (num >>> 31)
            }

            function rotl5 (num) {
              return (num << 5) | (num >>> 27)
            }

            function rotl30 (num) {
              return (num << 30) | (num >>> 2)
            }

            function ft (s, b, c, d) {
              if (s === 0) return (b & c) | ((~b) & d)
              if (s === 2) return (b & c) | (b & d) | (c & d)
              return b ^ c ^ d
            }

            Sha1.prototype._update = function (M) {
              var W = this._w

              var a = this._a | 0
              var b = this._b | 0
              var c = this._c | 0
              var d = this._d | 0
              var e = this._e | 0

              for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
              for (; i < 80; ++i) W[i] = rotl1(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16])

              for (var j = 0; j < 80; ++j) {
                var s = ~~(j / 20)
                var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0

                e = d
                d = c
                c = rotl30(b)
                b = a
                a = t
              }

              this._a = (a + this._a) | 0
              this._b = (b + this._b) | 0
              this._c = (c + this._c) | 0
              this._d = (d + this._d) | 0
              this._e = (e + this._e) | 0
            }

            Sha1.prototype._hash = function () {
              var H = Buffer.allocUnsafe(20)

              H.writeInt32BE(this._a | 0, 0)
              H.writeInt32BE(this._b | 0, 4)
              H.writeInt32BE(this._c | 0, 8)
              H.writeInt32BE(this._d | 0, 12)
              H.writeInt32BE(this._e | 0, 16)

              return H
            }

            module.exports = Sha1

            },{"./hash":48,"inherits":29,"safe-buffer":47}],52:[function(require,module,exports){
            /**
             * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
             * in FIPS 180-2
             * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
             * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
             *
             */

            var inherits = require('inherits')
            var Sha256 = require('./sha256')
            var Hash = require('./hash')
            var Buffer = require('safe-buffer').Buffer

            var W = new Array(64)

            function Sha224 () {
              this.init()

              this._w = W // new Array(64)

              Hash.call(this, 64, 56)
            }

            inherits(Sha224, Sha256)

            Sha224.prototype.init = function () {
              this._a = 0xc1059ed8
              this._b = 0x367cd507
              this._c = 0x3070dd17
              this._d = 0xf70e5939
              this._e = 0xffc00b31
              this._f = 0x68581511
              this._g = 0x64f98fa7
              this._h = 0xbefa4fa4

              return this
            }

            Sha224.prototype._hash = function () {
              var H = Buffer.allocUnsafe(28)

              H.writeInt32BE(this._a, 0)
              H.writeInt32BE(this._b, 4)
              H.writeInt32BE(this._c, 8)
              H.writeInt32BE(this._d, 12)
              H.writeInt32BE(this._e, 16)
              H.writeInt32BE(this._f, 20)
              H.writeInt32BE(this._g, 24)

              return H
            }

            module.exports = Sha224

            },{"./hash":48,"./sha256":53,"inherits":29,"safe-buffer":47}],53:[function(require,module,exports){
            /**
             * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
             * in FIPS 180-2
             * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
             * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
             *
             */

            var inherits = require('inherits')
            var Hash = require('./hash')
            var Buffer = require('safe-buffer').Buffer

            var K = [
              0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
              0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
              0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
              0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
              0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
              0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
              0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
              0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
              0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
              0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
              0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
              0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
              0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
              0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
              0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
              0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
            ]

            var W = new Array(64)

            function Sha256 () {
              this.init()

              this._w = W // new Array(64)

              Hash.call(this, 64, 56)
            }

            inherits(Sha256, Hash)

            Sha256.prototype.init = function () {
              this._a = 0x6a09e667
              this._b = 0xbb67ae85
              this._c = 0x3c6ef372
              this._d = 0xa54ff53a
              this._e = 0x510e527f
              this._f = 0x9b05688c
              this._g = 0x1f83d9ab
              this._h = 0x5be0cd19

              return this
            }

            function ch (x, y, z) {
              return z ^ (x & (y ^ z))
            }

            function maj (x, y, z) {
              return (x & y) | (z & (x | y))
            }

            function sigma0 (x) {
              return (x >>> 2 | x << 30) ^ (x >>> 13 | x << 19) ^ (x >>> 22 | x << 10)
            }

            function sigma1 (x) {
              return (x >>> 6 | x << 26) ^ (x >>> 11 | x << 21) ^ (x >>> 25 | x << 7)
            }

            function gamma0 (x) {
              return (x >>> 7 | x << 25) ^ (x >>> 18 | x << 14) ^ (x >>> 3)
            }

            function gamma1 (x) {
              return (x >>> 17 | x << 15) ^ (x >>> 19 | x << 13) ^ (x >>> 10)
            }

            Sha256.prototype._update = function (M) {
              var W = this._w

              var a = this._a | 0
              var b = this._b | 0
              var c = this._c | 0
              var d = this._d | 0
              var e = this._e | 0
              var f = this._f | 0
              var g = this._g | 0
              var h = this._h | 0

              for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
              for (; i < 64; ++i) W[i] = (gamma1(W[i - 2]) + W[i - 7] + gamma0(W[i - 15]) + W[i - 16]) | 0

              for (var j = 0; j < 64; ++j) {
                var T1 = (h + sigma1(e) + ch(e, f, g) + K[j] + W[j]) | 0
                var T2 = (sigma0(a) + maj(a, b, c)) | 0

                h = g
                g = f
                f = e
                e = (d + T1) | 0
                d = c
                c = b
                b = a
                a = (T1 + T2) | 0
              }

              this._a = (a + this._a) | 0
              this._b = (b + this._b) | 0
              this._c = (c + this._c) | 0
              this._d = (d + this._d) | 0
              this._e = (e + this._e) | 0
              this._f = (f + this._f) | 0
              this._g = (g + this._g) | 0
              this._h = (h + this._h) | 0
            }

            Sha256.prototype._hash = function () {
              var H = Buffer.allocUnsafe(32)

              H.writeInt32BE(this._a, 0)
              H.writeInt32BE(this._b, 4)
              H.writeInt32BE(this._c, 8)
              H.writeInt32BE(this._d, 12)
              H.writeInt32BE(this._e, 16)
              H.writeInt32BE(this._f, 20)
              H.writeInt32BE(this._g, 24)
              H.writeInt32BE(this._h, 28)

              return H
            }

            module.exports = Sha256

            },{"./hash":48,"inherits":29,"safe-buffer":47}],54:[function(require,module,exports){
            var inherits = require('inherits')
            var SHA512 = require('./sha512')
            var Hash = require('./hash')
            var Buffer = require('safe-buffer').Buffer

            var W = new Array(160)

            function Sha384 () {
              this.init()
              this._w = W

              Hash.call(this, 128, 112)
            }

            inherits(Sha384, SHA512)

            Sha384.prototype.init = function () {
              this._ah = 0xcbbb9d5d
              this._bh = 0x629a292a
              this._ch = 0x9159015a
              this._dh = 0x152fecd8
              this._eh = 0x67332667
              this._fh = 0x8eb44a87
              this._gh = 0xdb0c2e0d
              this._hh = 0x47b5481d

              this._al = 0xc1059ed8
              this._bl = 0x367cd507
              this._cl = 0x3070dd17
              this._dl = 0xf70e5939
              this._el = 0xffc00b31
              this._fl = 0x68581511
              this._gl = 0x64f98fa7
              this._hl = 0xbefa4fa4

              return this
            }

            Sha384.prototype._hash = function () {
              var H = Buffer.allocUnsafe(48)

              function writeInt64BE (h, l, offset) {
                H.writeInt32BE(h, offset)
                H.writeInt32BE(l, offset + 4)
              }

              writeInt64BE(this._ah, this._al, 0)
              writeInt64BE(this._bh, this._bl, 8)
              writeInt64BE(this._ch, this._cl, 16)
              writeInt64BE(this._dh, this._dl, 24)
              writeInt64BE(this._eh, this._el, 32)
              writeInt64BE(this._fh, this._fl, 40)

              return H
            }

            module.exports = Sha384

            },{"./hash":48,"./sha512":55,"inherits":29,"safe-buffer":47}],55:[function(require,module,exports){
            var inherits = require('inherits')
            var Hash = require('./hash')
            var Buffer = require('safe-buffer').Buffer

            var K = [
              0x428a2f98, 0xd728ae22, 0x71374491, 0x23ef65cd,
              0xb5c0fbcf, 0xec4d3b2f, 0xe9b5dba5, 0x8189dbbc,
              0x3956c25b, 0xf348b538, 0x59f111f1, 0xb605d019,
              0x923f82a4, 0xaf194f9b, 0xab1c5ed5, 0xda6d8118,
              0xd807aa98, 0xa3030242, 0x12835b01, 0x45706fbe,
              0x243185be, 0x4ee4b28c, 0x550c7dc3, 0xd5ffb4e2,
              0x72be5d74, 0xf27b896f, 0x80deb1fe, 0x3b1696b1,
              0x9bdc06a7, 0x25c71235, 0xc19bf174, 0xcf692694,
              0xe49b69c1, 0x9ef14ad2, 0xefbe4786, 0x384f25e3,
              0x0fc19dc6, 0x8b8cd5b5, 0x240ca1cc, 0x77ac9c65,
              0x2de92c6f, 0x592b0275, 0x4a7484aa, 0x6ea6e483,
              0x5cb0a9dc, 0xbd41fbd4, 0x76f988da, 0x831153b5,
              0x983e5152, 0xee66dfab, 0xa831c66d, 0x2db43210,
              0xb00327c8, 0x98fb213f, 0xbf597fc7, 0xbeef0ee4,
              0xc6e00bf3, 0x3da88fc2, 0xd5a79147, 0x930aa725,
              0x06ca6351, 0xe003826f, 0x14292967, 0x0a0e6e70,
              0x27b70a85, 0x46d22ffc, 0x2e1b2138, 0x5c26c926,
              0x4d2c6dfc, 0x5ac42aed, 0x53380d13, 0x9d95b3df,
              0x650a7354, 0x8baf63de, 0x766a0abb, 0x3c77b2a8,
              0x81c2c92e, 0x47edaee6, 0x92722c85, 0x1482353b,
              0xa2bfe8a1, 0x4cf10364, 0xa81a664b, 0xbc423001,
              0xc24b8b70, 0xd0f89791, 0xc76c51a3, 0x0654be30,
              0xd192e819, 0xd6ef5218, 0xd6990624, 0x5565a910,
              0xf40e3585, 0x5771202a, 0x106aa070, 0x32bbd1b8,
              0x19a4c116, 0xb8d2d0c8, 0x1e376c08, 0x5141ab53,
              0x2748774c, 0xdf8eeb99, 0x34b0bcb5, 0xe19b48a8,
              0x391c0cb3, 0xc5c95a63, 0x4ed8aa4a, 0xe3418acb,
              0x5b9cca4f, 0x7763e373, 0x682e6ff3, 0xd6b2b8a3,
              0x748f82ee, 0x5defb2fc, 0x78a5636f, 0x43172f60,
              0x84c87814, 0xa1f0ab72, 0x8cc70208, 0x1a6439ec,
              0x90befffa, 0x23631e28, 0xa4506ceb, 0xde82bde9,
              0xbef9a3f7, 0xb2c67915, 0xc67178f2, 0xe372532b,
              0xca273ece, 0xea26619c, 0xd186b8c7, 0x21c0c207,
              0xeada7dd6, 0xcde0eb1e, 0xf57d4f7f, 0xee6ed178,
              0x06f067aa, 0x72176fba, 0x0a637dc5, 0xa2c898a6,
              0x113f9804, 0xbef90dae, 0x1b710b35, 0x131c471b,
              0x28db77f5, 0x23047d84, 0x32caab7b, 0x40c72493,
              0x3c9ebe0a, 0x15c9bebc, 0x431d67c4, 0x9c100d4c,
              0x4cc5d4be, 0xcb3e42b6, 0x597f299c, 0xfc657e2a,
              0x5fcb6fab, 0x3ad6faec, 0x6c44198c, 0x4a475817
            ]

            var W = new Array(160)

            function Sha512 () {
              this.init()
              this._w = W

              Hash.call(this, 128, 112)
            }

            inherits(Sha512, Hash)

            Sha512.prototype.init = function () {
              this._ah = 0x6a09e667
              this._bh = 0xbb67ae85
              this._ch = 0x3c6ef372
              this._dh = 0xa54ff53a
              this._eh = 0x510e527f
              this._fh = 0x9b05688c
              this._gh = 0x1f83d9ab
              this._hh = 0x5be0cd19

              this._al = 0xf3bcc908
              this._bl = 0x84caa73b
              this._cl = 0xfe94f82b
              this._dl = 0x5f1d36f1
              this._el = 0xade682d1
              this._fl = 0x2b3e6c1f
              this._gl = 0xfb41bd6b
              this._hl = 0x137e2179

              return this
            }

            function Ch (x, y, z) {
              return z ^ (x & (y ^ z))
            }

            function maj (x, y, z) {
              return (x & y) | (z & (x | y))
            }

            function sigma0 (x, xl) {
              return (x >>> 28 | xl << 4) ^ (xl >>> 2 | x << 30) ^ (xl >>> 7 | x << 25)
            }

            function sigma1 (x, xl) {
              return (x >>> 14 | xl << 18) ^ (x >>> 18 | xl << 14) ^ (xl >>> 9 | x << 23)
            }

            function Gamma0 (x, xl) {
              return (x >>> 1 | xl << 31) ^ (x >>> 8 | xl << 24) ^ (x >>> 7)
            }

            function Gamma0l (x, xl) {
              return (x >>> 1 | xl << 31) ^ (x >>> 8 | xl << 24) ^ (x >>> 7 | xl << 25)
            }

            function Gamma1 (x, xl) {
              return (x >>> 19 | xl << 13) ^ (xl >>> 29 | x << 3) ^ (x >>> 6)
            }

            function Gamma1l (x, xl) {
              return (x >>> 19 | xl << 13) ^ (xl >>> 29 | x << 3) ^ (x >>> 6 | xl << 26)
            }

            function getCarry (a, b) {
              return (a >>> 0) < (b >>> 0) ? 1 : 0
            }

            Sha512.prototype._update = function (M) {
              var W = this._w

              var ah = this._ah | 0
              var bh = this._bh | 0
              var ch = this._ch | 0
              var dh = this._dh | 0
              var eh = this._eh | 0
              var fh = this._fh | 0
              var gh = this._gh | 0
              var hh = this._hh | 0

              var al = this._al | 0
              var bl = this._bl | 0
              var cl = this._cl | 0
              var dl = this._dl | 0
              var el = this._el | 0
              var fl = this._fl | 0
              var gl = this._gl | 0
              var hl = this._hl | 0

              for (var i = 0; i < 32; i += 2) {
                W[i] = M.readInt32BE(i * 4)
                W[i + 1] = M.readInt32BE(i * 4 + 4)
              }
              for (; i < 160; i += 2) {
                var xh = W[i - 15 * 2]
                var xl = W[i - 15 * 2 + 1]
                var gamma0 = Gamma0(xh, xl)
                var gamma0l = Gamma0l(xl, xh)

                xh = W[i - 2 * 2]
                xl = W[i - 2 * 2 + 1]
                var gamma1 = Gamma1(xh, xl)
                var gamma1l = Gamma1l(xl, xh)

                // W[i] = gamma0 + W[i - 7] + gamma1 + W[i - 16]
                var Wi7h = W[i - 7 * 2]
                var Wi7l = W[i - 7 * 2 + 1]

                var Wi16h = W[i - 16 * 2]
                var Wi16l = W[i - 16 * 2 + 1]

                var Wil = (gamma0l + Wi7l) | 0
                var Wih = (gamma0 + Wi7h + getCarry(Wil, gamma0l)) | 0
                Wil = (Wil + gamma1l) | 0
                Wih = (Wih + gamma1 + getCarry(Wil, gamma1l)) | 0
                Wil = (Wil + Wi16l) | 0
                Wih = (Wih + Wi16h + getCarry(Wil, Wi16l)) | 0

                W[i] = Wih
                W[i + 1] = Wil
              }

              for (var j = 0; j < 160; j += 2) {
                Wih = W[j]
                Wil = W[j + 1]

                var majh = maj(ah, bh, ch)
                var majl = maj(al, bl, cl)

                var sigma0h = sigma0(ah, al)
                var sigma0l = sigma0(al, ah)
                var sigma1h = sigma1(eh, el)
                var sigma1l = sigma1(el, eh)

                // t1 = h + sigma1 + ch + K[j] + W[j]
                var Kih = K[j]
                var Kil = K[j + 1]

                var chh = Ch(eh, fh, gh)
                var chl = Ch(el, fl, gl)

                var t1l = (hl + sigma1l) | 0
                var t1h = (hh + sigma1h + getCarry(t1l, hl)) | 0
                t1l = (t1l + chl) | 0
                t1h = (t1h + chh + getCarry(t1l, chl)) | 0
                t1l = (t1l + Kil) | 0
                t1h = (t1h + Kih + getCarry(t1l, Kil)) | 0
                t1l = (t1l + Wil) | 0
                t1h = (t1h + Wih + getCarry(t1l, Wil)) | 0

                // t2 = sigma0 + maj
                var t2l = (sigma0l + majl) | 0
                var t2h = (sigma0h + majh + getCarry(t2l, sigma0l)) | 0

                hh = gh
                hl = gl
                gh = fh
                gl = fl
                fh = eh
                fl = el
                el = (dl + t1l) | 0
                eh = (dh + t1h + getCarry(el, dl)) | 0
                dh = ch
                dl = cl
                ch = bh
                cl = bl
                bh = ah
                bl = al
                al = (t1l + t2l) | 0
                ah = (t1h + t2h + getCarry(al, t1l)) | 0
              }

              this._al = (this._al + al) | 0
              this._bl = (this._bl + bl) | 0
              this._cl = (this._cl + cl) | 0
              this._dl = (this._dl + dl) | 0
              this._el = (this._el + el) | 0
              this._fl = (this._fl + fl) | 0
              this._gl = (this._gl + gl) | 0
              this._hl = (this._hl + hl) | 0

              this._ah = (this._ah + ah + getCarry(this._al, al)) | 0
              this._bh = (this._bh + bh + getCarry(this._bl, bl)) | 0
              this._ch = (this._ch + ch + getCarry(this._cl, cl)) | 0
              this._dh = (this._dh + dh + getCarry(this._dl, dl)) | 0
              this._eh = (this._eh + eh + getCarry(this._el, el)) | 0
              this._fh = (this._fh + fh + getCarry(this._fl, fl)) | 0
              this._gh = (this._gh + gh + getCarry(this._gl, gl)) | 0
              this._hh = (this._hh + hh + getCarry(this._hl, hl)) | 0
            }

            Sha512.prototype._hash = function () {
              var H = Buffer.allocUnsafe(64)

              function writeInt64BE (h, l, offset) {
                H.writeInt32BE(h, offset)
                H.writeInt32BE(l, offset + 4)
              }

              writeInt64BE(this._ah, this._al, 0)
              writeInt64BE(this._bh, this._bl, 8)
              writeInt64BE(this._ch, this._cl, 16)
              writeInt64BE(this._dh, this._dl, 24)
              writeInt64BE(this._eh, this._el, 32)
              writeInt64BE(this._fh, this._fl, 40)
              writeInt64BE(this._gh, this._gl, 48)
              writeInt64BE(this._hh, this._hl, 56)

              return H
            }

            module.exports = Sha512

            },{"./hash":48,"inherits":29,"safe-buffer":47}],56:[function(require,module,exports){
            arguments[4][24][0].apply(exports,arguments)
            },{"dup":24,"safe-buffer":47}],57:[function(require,module,exports){
            arguments[4][25][0].apply(exports,arguments)
            },{"dup":25}]},{},[26])(26)
        });

        (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Buffer = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
            'use strict'

            exports.byteLength = byteLength
            exports.toByteArray = toByteArray
            exports.fromByteArray = fromByteArray

            var lookup = []
            var revLookup = []
            var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array

            var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
            for (var i = 0, len = code.length; i < len; ++i) {
              lookup[i] = code[i]
              revLookup[code.charCodeAt(i)] = i
            }

            // Support decoding URL-safe base64 strings, as Node.js does.
            // See: https://en.wikipedia.org/wiki/Base64#URL_applications
            revLookup['-'.charCodeAt(0)] = 62
            revLookup['_'.charCodeAt(0)] = 63

            function getLens (b64) {
              var len = b64.length

              if (len % 4 > 0) {
                throw new Error('Invalid string. Length must be a multiple of 4')
              }

              // Trim off extra bytes after placeholder bytes are found
              // See: https://github.com/beatgammit/base64-js/issues/42
              var validLen = b64.indexOf('=')
              if (validLen === -1) validLen = len

              var placeHoldersLen = validLen === len
                ? 0
                : 4 - (validLen % 4)

              return [validLen, placeHoldersLen]
            }

            // base64 is 4/3 + up to two characters of the original data
            function byteLength (b64) {
              var lens = getLens(b64)
              var validLen = lens[0]
              var placeHoldersLen = lens[1]
              return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
            }

            function _byteLength (b64, validLen, placeHoldersLen) {
              return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
            }

            function toByteArray (b64) {
              var tmp
              var lens = getLens(b64)
              var validLen = lens[0]
              var placeHoldersLen = lens[1]

              var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))

              var curByte = 0

              // if there are placeholders, only get up to the last complete 4 chars
              var len = placeHoldersLen > 0
                ? validLen - 4
                : validLen

              var i
              for (i = 0; i < len; i += 4) {
                tmp =
                  (revLookup[b64.charCodeAt(i)] << 18) |
                  (revLookup[b64.charCodeAt(i + 1)] << 12) |
                  (revLookup[b64.charCodeAt(i + 2)] << 6) |
                  revLookup[b64.charCodeAt(i + 3)]
                arr[curByte++] = (tmp >> 16) & 0xFF
                arr[curByte++] = (tmp >> 8) & 0xFF
                arr[curByte++] = tmp & 0xFF
              }

              if (placeHoldersLen === 2) {
                tmp =
                  (revLookup[b64.charCodeAt(i)] << 2) |
                  (revLookup[b64.charCodeAt(i + 1)] >> 4)
                arr[curByte++] = tmp & 0xFF
              }

              if (placeHoldersLen === 1) {
                tmp =
                  (revLookup[b64.charCodeAt(i)] << 10) |
                  (revLookup[b64.charCodeAt(i + 1)] << 4) |
                  (revLookup[b64.charCodeAt(i + 2)] >> 2)
                arr[curByte++] = (tmp >> 8) & 0xFF
                arr[curByte++] = tmp & 0xFF
              }

              return arr
            }

            function tripletToBase64 (num) {
              return lookup[num >> 18 & 0x3F] +
                lookup[num >> 12 & 0x3F] +
                lookup[num >> 6 & 0x3F] +
                lookup[num & 0x3F]
            }

            function encodeChunk (uint8, start, end) {
              var tmp
              var output = []
              for (var i = start; i < end; i += 3) {
                tmp =
                  ((uint8[i] << 16) & 0xFF0000) +
                  ((uint8[i + 1] << 8) & 0xFF00) +
                  (uint8[i + 2] & 0xFF)
                output.push(tripletToBase64(tmp))
              }
              return output.join('')
            }

            function fromByteArray (uint8) {
              var tmp
              var len = uint8.length
              var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
              var parts = []
              var maxChunkLength = 16383 // must be multiple of 3

              // go through the array every three bytes, we'll deal with trailing stuff later
              for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
                parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
              }

              // pad the end with zeros, but make sure to not forget the extra bytes
              if (extraBytes === 1) {
                tmp = uint8[len - 1]
                parts.push(
                  lookup[tmp >> 2] +
                  lookup[(tmp << 4) & 0x3F] +
                  '=='
                )
              } else if (extraBytes === 2) {
                tmp = (uint8[len - 2] << 8) + uint8[len - 1]
                parts.push(
                  lookup[tmp >> 10] +
                  lookup[(tmp >> 4) & 0x3F] +
                  lookup[(tmp << 2) & 0x3F] +
                  '='
                )
              }

              return parts.join('')
            }

            },{}],2:[function(require,module,exports){
            (function (Buffer){(function (){
            /*!
             * The buffer module from node.js, for the browser.
             *
             * @author   Feross Aboukhadijeh <https://feross.org>
             * @license  MIT
             */
            /* eslint-disable no-proto */

            'use strict'

            var base64 = require('base64-js')
            var ieee754 = require('ieee754')

            exports.Buffer = Buffer
            exports.SlowBuffer = SlowBuffer
            exports.INSPECT_MAX_BYTES = 50

            var K_MAX_LENGTH = 0x7fffffff
            exports.kMaxLength = K_MAX_LENGTH

            /**
             * If `Buffer.TYPED_ARRAY_SUPPORT`:
             *   === true    Use Uint8Array implementation (fastest)
             *   === false   Print warning and recommend using `buffer` v4.x which has an Object
             *               implementation (most compatible, even IE6)
             *
             * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
             * Opera 11.6+, iOS 4.2+.
             *
             * We report that the browser does not support typed arrays if the are not subclassable
             * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
             * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
             * for __proto__ and has a buggy typed array implementation.
             */
            Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

            if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
                typeof console.error === 'function') {
              console.error(
                'This browser lacks typed array (Uint8Array) support which is required by ' +
                '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
              )
            }

            function typedArraySupport () {
              // Can typed array instances can be augmented?
              try {
                var arr = new Uint8Array(1)
                arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
                return arr.foo() === 42
              } catch (e) {
                return false
              }
            }

            Object.defineProperty(Buffer.prototype, 'parent', {
              enumerable: true,
              get: function () {
                if (!Buffer.isBuffer(this)) return undefined
                return this.buffer
              }
            })

            Object.defineProperty(Buffer.prototype, 'offset', {
              enumerable: true,
              get: function () {
                if (!Buffer.isBuffer(this)) return undefined
                return this.byteOffset
              }
            })

            function createBuffer (length) {
              if (length > K_MAX_LENGTH) {
                throw new RangeError('The value "' + length + '" is invalid for option "size"')
              }
              // Return an augmented `Uint8Array` instance
              var buf = new Uint8Array(length)
              buf.__proto__ = Buffer.prototype
              return buf
            }

            /**
             * The Buffer constructor returns instances of `Uint8Array` that have their
             * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
             * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
             * and the `Uint8Array` methods. Square bracket notation works as expected -- it
             * returns a single octet.
             *
             * The `Uint8Array` prototype remains unmodified.
             */

            function Buffer (arg, encodingOrOffset, length) {
              // Common case.
              if (typeof arg === 'number') {
                if (typeof encodingOrOffset === 'string') {
                  throw new TypeError(
                    'The "string" argument must be of type string. Received type number'
                  )
                }
                return allocUnsafe(arg)
              }
              return from(arg, encodingOrOffset, length)
            }

            // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
            if (typeof Symbol !== 'undefined' && Symbol.species != null &&
                Buffer[Symbol.species] === Buffer) {
              Object.defineProperty(Buffer, Symbol.species, {
                value: null,
                configurable: true,
                enumerable: false,
                writable: false
              })
            }

            Buffer.poolSize = 8192 // not used by this implementation

            function from (value, encodingOrOffset, length) {
              if (typeof value === 'string') {
                return fromString(value, encodingOrOffset)
              }

              if (ArrayBuffer.isView(value)) {
                return fromArrayLike(value)
              }

              if (value == null) {
                throw TypeError(
                  'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
                  'or Array-like Object. Received type ' + (typeof value)
                )
              }

              if (isInstance(value, ArrayBuffer) ||
                  (value && isInstance(value.buffer, ArrayBuffer))) {
                return fromArrayBuffer(value, encodingOrOffset, length)
              }

              if (typeof value === 'number') {
                throw new TypeError(
                  'The "value" argument must not be of type number. Received type number'
                )
              }

              var valueOf = value.valueOf && value.valueOf()
              if (valueOf != null && valueOf !== value) {
                return Buffer.from(valueOf, encodingOrOffset, length)
              }

              var b = fromObject(value)
              if (b) return b

              if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
                  typeof value[Symbol.toPrimitive] === 'function') {
                return Buffer.from(
                  value[Symbol.toPrimitive]('string'), encodingOrOffset, length
                )
              }

              throw new TypeError(
                'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
                'or Array-like Object. Received type ' + (typeof value)
              )
            }

            /**
             * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
             * if value is a number.
             * Buffer.from(str[, encoding])
             * Buffer.from(array)
             * Buffer.from(buffer)
             * Buffer.from(arrayBuffer[, byteOffset[, length]])
             **/
            Buffer.from = function (value, encodingOrOffset, length) {
              return from(value, encodingOrOffset, length)
            }

            // Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
            // https://github.com/feross/buffer/pull/148
            Buffer.prototype.__proto__ = Uint8Array.prototype
            Buffer.__proto__ = Uint8Array

            function assertSize (size) {
              if (typeof size !== 'number') {
                throw new TypeError('"size" argument must be of type number')
              } else if (size < 0) {
                throw new RangeError('The value "' + size + '" is invalid for option "size"')
              }
            }

            function alloc (size, fill, encoding) {
              assertSize(size)
              if (size <= 0) {
                return createBuffer(size)
              }
              if (fill !== undefined) {
                // Only pay attention to encoding if it's a string. This
                // prevents accidentally sending in a number that would
                // be interpretted as a start offset.
                return typeof encoding === 'string'
                  ? createBuffer(size).fill(fill, encoding)
                  : createBuffer(size).fill(fill)
              }
              return createBuffer(size)
            }

            /**
             * Creates a new filled Buffer instance.
             * alloc(size[, fill[, encoding]])
             **/
            Buffer.alloc = function (size, fill, encoding) {
              return alloc(size, fill, encoding)
            }

            function allocUnsafe (size) {
              assertSize(size)
              return createBuffer(size < 0 ? 0 : checked(size) | 0)
            }

            /**
             * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
             * */
            Buffer.allocUnsafe = function (size) {
              return allocUnsafe(size)
            }
            /**
             * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
             */
            Buffer.allocUnsafeSlow = function (size) {
              return allocUnsafe(size)
            }

            function fromString (string, encoding) {
              if (typeof encoding !== 'string' || encoding === '') {
                encoding = 'utf8'
              }

              if (!Buffer.isEncoding(encoding)) {
                throw new TypeError('Unknown encoding: ' + encoding)
              }

              var length = byteLength(string, encoding) | 0
              var buf = createBuffer(length)

              var actual = buf.write(string, encoding)

              if (actual !== length) {
                // Writing a hex string, for example, that contains invalid characters will
                // cause everything after the first invalid character to be ignored. (e.g.
                // 'abxxcd' will be treated as 'ab')
                buf = buf.slice(0, actual)
              }

              return buf
            }

            function fromArrayLike (array) {
              var length = array.length < 0 ? 0 : checked(array.length) | 0
              var buf = createBuffer(length)
              for (var i = 0; i < length; i += 1) {
                buf[i] = array[i] & 255
              }
              return buf
            }

            function fromArrayBuffer (array, byteOffset, length) {
              if (byteOffset < 0 || array.byteLength < byteOffset) {
                throw new RangeError('"offset" is outside of buffer bounds')
              }

              if (array.byteLength < byteOffset + (length || 0)) {
                throw new RangeError('"length" is outside of buffer bounds')
              }

              var buf
              if (byteOffset === undefined && length === undefined) {
                buf = new Uint8Array(array)
              } else if (length === undefined) {
                buf = new Uint8Array(array, byteOffset)
              } else {
                buf = new Uint8Array(array, byteOffset, length)
              }

              // Return an augmented `Uint8Array` instance
              buf.__proto__ = Buffer.prototype
              return buf
            }

            function fromObject (obj) {
              if (Buffer.isBuffer(obj)) {
                var len = checked(obj.length) | 0
                var buf = createBuffer(len)

                if (buf.length === 0) {
                  return buf
                }

                obj.copy(buf, 0, 0, len)
                return buf
              }

              if (obj.length !== undefined) {
                if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
                  return createBuffer(0)
                }
                return fromArrayLike(obj)
              }

              if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
                return fromArrayLike(obj.data)
              }
            }

            function checked (length) {
              // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
              // length is NaN (which is otherwise coerced to zero.)
              if (length >= K_MAX_LENGTH) {
                throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                                     'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
              }
              return length | 0
            }

            function SlowBuffer (length) {
              if (+length != length) { // eslint-disable-line eqeqeq
                length = 0
              }
              return Buffer.alloc(+length)
            }

            Buffer.isBuffer = function isBuffer (b) {
              return b != null && b._isBuffer === true &&
                b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
            }

            Buffer.compare = function compare (a, b) {
              if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
              if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
              if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
                throw new TypeError(
                  'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
                )
              }

              if (a === b) return 0

              var x = a.length
              var y = b.length

              for (var i = 0, len = Math.min(x, y); i < len; ++i) {
                if (a[i] !== b[i]) {
                  x = a[i]
                  y = b[i]
                  break
                }
              }

              if (x < y) return -1
              if (y < x) return 1
              return 0
            }

            Buffer.isEncoding = function isEncoding (encoding) {
              switch (String(encoding).toLowerCase()) {
                case 'hex':
                case 'utf8':
                case 'utf-8':
                case 'ascii':
                case 'latin1':
                case 'binary':
                case 'base64':
                case 'ucs2':
                case 'ucs-2':
                case 'utf16le':
                case 'utf-16le':
                  return true
                default:
                  return false
              }
            }

            Buffer.concat = function concat (list, length) {
              if (!Array.isArray(list)) {
                throw new TypeError('"list" argument must be an Array of Buffers')
              }

              if (list.length === 0) {
                return Buffer.alloc(0)
              }

              var i
              if (length === undefined) {
                length = 0
                for (i = 0; i < list.length; ++i) {
                  length += list[i].length
                }
              }

              var buffer = Buffer.allocUnsafe(length)
              var pos = 0
              for (i = 0; i < list.length; ++i) {
                var buf = list[i]
                if (isInstance(buf, Uint8Array)) {
                  buf = Buffer.from(buf)
                }
                if (!Buffer.isBuffer(buf)) {
                  throw new TypeError('"list" argument must be an Array of Buffers')
                }
                buf.copy(buffer, pos)
                pos += buf.length
              }
              return buffer
            }

            function byteLength (string, encoding) {
              if (Buffer.isBuffer(string)) {
                return string.length
              }
              if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
                return string.byteLength
              }
              if (typeof string !== 'string') {
                throw new TypeError(
                  'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
                  'Received type ' + typeof string
                )
              }

              var len = string.length
              var mustMatch = (arguments.length > 2 && arguments[2] === true)
              if (!mustMatch && len === 0) return 0

              // Use a for loop to avoid recursion
              var loweredCase = false
              for (;;) {
                switch (encoding) {
                  case 'ascii':
                  case 'latin1':
                  case 'binary':
                    return len
                  case 'utf8':
                  case 'utf-8':
                    return utf8ToBytes(string).length
                  case 'ucs2':
                  case 'ucs-2':
                  case 'utf16le':
                  case 'utf-16le':
                    return len * 2
                  case 'hex':
                    return len >>> 1
                  case 'base64':
                    return base64ToBytes(string).length
                  default:
                    if (loweredCase) {
                      return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
                    }
                    encoding = ('' + encoding).toLowerCase()
                    loweredCase = true
                }
              }
            }
            Buffer.byteLength = byteLength

            function slowToString (encoding, start, end) {
              var loweredCase = false

              // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
              // property of a typed array.

              // This behaves neither like String nor Uint8Array in that we set start/end
              // to their upper/lower bounds if the value passed is out of range.
              // undefined is handled specially as per ECMA-262 6th Edition,
              // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
              if (start === undefined || start < 0) {
                start = 0
              }
              // Return early if start > this.length. Done here to prevent potential uint32
              // coercion fail below.
              if (start > this.length) {
                return ''
              }

              if (end === undefined || end > this.length) {
                end = this.length
              }

              if (end <= 0) {
                return ''
              }

              // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
              end >>>= 0
              start >>>= 0

              if (end <= start) {
                return ''
              }

              if (!encoding) encoding = 'utf8'

              while (true) {
                switch (encoding) {
                  case 'hex':
                    return hexSlice(this, start, end)

                  case 'utf8':
                  case 'utf-8':
                    return utf8Slice(this, start, end)

                  case 'ascii':
                    return asciiSlice(this, start, end)

                  case 'latin1':
                  case 'binary':
                    return latin1Slice(this, start, end)

                  case 'base64':
                    return base64Slice(this, start, end)

                  case 'ucs2':
                  case 'ucs-2':
                  case 'utf16le':
                  case 'utf-16le':
                    return utf16leSlice(this, start, end)

                  default:
                    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                    encoding = (encoding + '').toLowerCase()
                    loweredCase = true
                }
              }
            }

            // This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
            // to detect a Buffer instance. It's not possible to use `instanceof Buffer`
            // reliably in a browserify context because there could be multiple different
            // copies of the 'buffer' package in use. This method works even for Buffer
            // instances that were created from another copy of the `buffer` package.
            // See: https://github.com/feross/buffer/issues/154
            Buffer.prototype._isBuffer = true

            function swap (b, n, m) {
              var i = b[n]
              b[n] = b[m]
              b[m] = i
            }

            Buffer.prototype.swap16 = function swap16 () {
              var len = this.length
              if (len % 2 !== 0) {
                throw new RangeError('Buffer size must be a multiple of 16-bits')
              }
              for (var i = 0; i < len; i += 2) {
                swap(this, i, i + 1)
              }
              return this
            }

            Buffer.prototype.swap32 = function swap32 () {
              var len = this.length
              if (len % 4 !== 0) {
                throw new RangeError('Buffer size must be a multiple of 32-bits')
              }
              for (var i = 0; i < len; i += 4) {
                swap(this, i, i + 3)
                swap(this, i + 1, i + 2)
              }
              return this
            }

            Buffer.prototype.swap64 = function swap64 () {
              var len = this.length
              if (len % 8 !== 0) {
                throw new RangeError('Buffer size must be a multiple of 64-bits')
              }
              for (var i = 0; i < len; i += 8) {
                swap(this, i, i + 7)
                swap(this, i + 1, i + 6)
                swap(this, i + 2, i + 5)
                swap(this, i + 3, i + 4)
              }
              return this
            }

            Buffer.prototype.toString = function toString () {
              var length = this.length
              if (length === 0) return ''
              if (arguments.length === 0) return utf8Slice(this, 0, length)
              return slowToString.apply(this, arguments)
            }

            Buffer.prototype.toLocaleString = Buffer.prototype.toString

            Buffer.prototype.equals = function equals (b) {
              if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
              if (this === b) return true
              return Buffer.compare(this, b) === 0
            }

            Buffer.prototype.inspect = function inspect () {
              var str = ''
              var max = exports.INSPECT_MAX_BYTES
              str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
              if (this.length > max) str += ' ... '
              return '<Buffer ' + str + '>'
            }

            Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
              if (isInstance(target, Uint8Array)) {
                target = Buffer.from(target, target.offset, target.byteLength)
              }
              if (!Buffer.isBuffer(target)) {
                throw new TypeError(
                  'The "target" argument must be one of type Buffer or Uint8Array. ' +
                  'Received type ' + (typeof target)
                )
              }

              if (start === undefined) {
                start = 0
              }
              if (end === undefined) {
                end = target ? target.length : 0
              }
              if (thisStart === undefined) {
                thisStart = 0
              }
              if (thisEnd === undefined) {
                thisEnd = this.length
              }

              if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
                throw new RangeError('out of range index')
              }

              if (thisStart >= thisEnd && start >= end) {
                return 0
              }
              if (thisStart >= thisEnd) {
                return -1
              }
              if (start >= end) {
                return 1
              }

              start >>>= 0
              end >>>= 0
              thisStart >>>= 0
              thisEnd >>>= 0

              if (this === target) return 0

              var x = thisEnd - thisStart
              var y = end - start
              var len = Math.min(x, y)

              var thisCopy = this.slice(thisStart, thisEnd)
              var targetCopy = target.slice(start, end)

              for (var i = 0; i < len; ++i) {
                if (thisCopy[i] !== targetCopy[i]) {
                  x = thisCopy[i]
                  y = targetCopy[i]
                  break
                }
              }

              if (x < y) return -1
              if (y < x) return 1
              return 0
            }

            // Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
            // OR the last index of `val` in `buffer` at offset <= `byteOffset`.
            //
            // Arguments:
            // - buffer - a Buffer to search
            // - val - a string, Buffer, or number
            // - byteOffset - an index into `buffer`; will be clamped to an int32
            // - encoding - an optional encoding, relevant is val is a string
            // - dir - true for indexOf, false for lastIndexOf
            function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
              // Empty buffer means no match
              if (buffer.length === 0) return -1

              // Normalize byteOffset
              if (typeof byteOffset === 'string') {
                encoding = byteOffset
                byteOffset = 0
              } else if (byteOffset > 0x7fffffff) {
                byteOffset = 0x7fffffff
              } else if (byteOffset < -0x80000000) {
                byteOffset = -0x80000000
              }
              byteOffset = +byteOffset // Coerce to Number.
              if (numberIsNaN(byteOffset)) {
                // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
                byteOffset = dir ? 0 : (buffer.length - 1)
              }

              // Normalize byteOffset: negative offsets start from the end of the buffer
              if (byteOffset < 0) byteOffset = buffer.length + byteOffset
              if (byteOffset >= buffer.length) {
                if (dir) return -1
                else byteOffset = buffer.length - 1
              } else if (byteOffset < 0) {
                if (dir) byteOffset = 0
                else return -1
              }

              // Normalize val
              if (typeof val === 'string') {
                val = Buffer.from(val, encoding)
              }

              // Finally, search either indexOf (if dir is true) or lastIndexOf
              if (Buffer.isBuffer(val)) {
                // Special case: looking for empty string/buffer always fails
                if (val.length === 0) {
                  return -1
                }
                return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
              } else if (typeof val === 'number') {
                val = val & 0xFF // Search for a byte value [0-255]
                if (typeof Uint8Array.prototype.indexOf === 'function') {
                  if (dir) {
                    return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
                  } else {
                    return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
                  }
                }
                return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
              }

              throw new TypeError('val must be string, number or Buffer')
            }

            function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
              var indexSize = 1
              var arrLength = arr.length
              var valLength = val.length

              if (encoding !== undefined) {
                encoding = String(encoding).toLowerCase()
                if (encoding === 'ucs2' || encoding === 'ucs-2' ||
                    encoding === 'utf16le' || encoding === 'utf-16le') {
                  if (arr.length < 2 || val.length < 2) {
                    return -1
                  }
                  indexSize = 2
                  arrLength /= 2
                  valLength /= 2
                  byteOffset /= 2
                }
              }

              function read (buf, i) {
                if (indexSize === 1) {
                  return buf[i]
                } else {
                  return buf.readUInt16BE(i * indexSize)
                }
              }

              var i
              if (dir) {
                var foundIndex = -1
                for (i = byteOffset; i < arrLength; i++) {
                  if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
                    if (foundIndex === -1) foundIndex = i
                    if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
                  } else {
                    if (foundIndex !== -1) i -= i - foundIndex
                    foundIndex = -1
                  }
                }
              } else {
                if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
                for (i = byteOffset; i >= 0; i--) {
                  var found = true
                  for (var j = 0; j < valLength; j++) {
                    if (read(arr, i + j) !== read(val, j)) {
                      found = false
                      break
                    }
                  }
                  if (found) return i
                }
              }

              return -1
            }

            Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
              return this.indexOf(val, byteOffset, encoding) !== -1
            }

            Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
              return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
            }

            Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
              return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
            }

            function hexWrite (buf, string, offset, length) {
              offset = Number(offset) || 0
              var remaining = buf.length - offset
              if (!length) {
                length = remaining
              } else {
                length = Number(length)
                if (length > remaining) {
                  length = remaining
                }
              }

              var strLen = string.length

              if (length > strLen / 2) {
                length = strLen / 2
              }
              for (var i = 0; i < length; ++i) {
                var parsed = parseInt(string.substr(i * 2, 2), 16)
                if (numberIsNaN(parsed)) return i
                buf[offset + i] = parsed
              }
              return i
            }

            function utf8Write (buf, string, offset, length) {
              return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
            }

            function asciiWrite (buf, string, offset, length) {
              return blitBuffer(asciiToBytes(string), buf, offset, length)
            }

            function latin1Write (buf, string, offset, length) {
              return asciiWrite(buf, string, offset, length)
            }

            function base64Write (buf, string, offset, length) {
              return blitBuffer(base64ToBytes(string), buf, offset, length)
            }

            function ucs2Write (buf, string, offset, length) {
              return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
            }

            Buffer.prototype.write = function write (string, offset, length, encoding) {
              // Buffer#write(string)
              if (offset === undefined) {
                encoding = 'utf8'
                length = this.length
                offset = 0
              // Buffer#write(string, encoding)
              } else if (length === undefined && typeof offset === 'string') {
                encoding = offset
                length = this.length
                offset = 0
              // Buffer#write(string, offset[, length][, encoding])
              } else if (isFinite(offset)) {
                offset = offset >>> 0
                if (isFinite(length)) {
                  length = length >>> 0
                  if (encoding === undefined) encoding = 'utf8'
                } else {
                  encoding = length
                  length = undefined
                }
              } else {
                throw new Error(
                  'Buffer.write(string, encoding, offset[, length]) is no longer supported'
                )
              }

              var remaining = this.length - offset
              if (length === undefined || length > remaining) length = remaining

              if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
                throw new RangeError('Attempt to write outside buffer bounds')
              }

              if (!encoding) encoding = 'utf8'

              var loweredCase = false
              for (;;) {
                switch (encoding) {
                  case 'hex':
                    return hexWrite(this, string, offset, length)

                  case 'utf8':
                  case 'utf-8':
                    return utf8Write(this, string, offset, length)

                  case 'ascii':
                    return asciiWrite(this, string, offset, length)

                  case 'latin1':
                  case 'binary':
                    return latin1Write(this, string, offset, length)

                  case 'base64':
                    // Warning: maxLength not taken into account in base64Write
                    return base64Write(this, string, offset, length)

                  case 'ucs2':
                  case 'ucs-2':
                  case 'utf16le':
                  case 'utf-16le':
                    return ucs2Write(this, string, offset, length)

                  default:
                    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                    encoding = ('' + encoding).toLowerCase()
                    loweredCase = true
                }
              }
            }

            Buffer.prototype.toJSON = function toJSON () {
              return {
                type: 'Buffer',
                data: Array.prototype.slice.call(this._arr || this, 0)
              }
            }

            function base64Slice (buf, start, end) {
              if (start === 0 && end === buf.length) {
                return base64.fromByteArray(buf)
              } else {
                return base64.fromByteArray(buf.slice(start, end))
              }
            }

            function utf8Slice (buf, start, end) {
              end = Math.min(buf.length, end)
              var res = []

              var i = start
              while (i < end) {
                var firstByte = buf[i]
                var codePoint = null
                var bytesPerSequence = (firstByte > 0xEF) ? 4
                  : (firstByte > 0xDF) ? 3
                    : (firstByte > 0xBF) ? 2
                      : 1

                if (i + bytesPerSequence <= end) {
                  var secondByte, thirdByte, fourthByte, tempCodePoint

                  switch (bytesPerSequence) {
                    case 1:
                      if (firstByte < 0x80) {
                        codePoint = firstByte
                      }
                      break
                    case 2:
                      secondByte = buf[i + 1]
                      if ((secondByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
                        if (tempCodePoint > 0x7F) {
                          codePoint = tempCodePoint
                        }
                      }
                      break
                    case 3:
                      secondByte = buf[i + 1]
                      thirdByte = buf[i + 2]
                      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
                        if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                          codePoint = tempCodePoint
                        }
                      }
                      break
                    case 4:
                      secondByte = buf[i + 1]
                      thirdByte = buf[i + 2]
                      fourthByte = buf[i + 3]
                      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
                        if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                          codePoint = tempCodePoint
                        }
                      }
                  }
                }

                if (codePoint === null) {
                  // we did not generate a valid codePoint so insert a
                  // replacement char (U+FFFD) and advance only 1 byte
                  codePoint = 0xFFFD
                  bytesPerSequence = 1
                } else if (codePoint > 0xFFFF) {
                  // encode to utf16 (surrogate pair dance)
                  codePoint -= 0x10000
                  res.push(codePoint >>> 10 & 0x3FF | 0xD800)
                  codePoint = 0xDC00 | codePoint & 0x3FF
                }

                res.push(codePoint)
                i += bytesPerSequence
              }

              return decodeCodePointsArray(res)
            }

            // Based on http://stackoverflow.com/a/22747272/680742, the browser with
            // the lowest limit is Chrome, with 0x10000 args.
            // We go 1 magnitude less, for safety
            var MAX_ARGUMENTS_LENGTH = 0x1000

            function decodeCodePointsArray (codePoints) {
              var len = codePoints.length
              if (len <= MAX_ARGUMENTS_LENGTH) {
                return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
              }

              // Decode in chunks to avoid "call stack size exceeded".
              var res = ''
              var i = 0
              while (i < len) {
                res += String.fromCharCode.apply(
                  String,
                  codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
                )
              }
              return res
            }

            function asciiSlice (buf, start, end) {
              var ret = ''
              end = Math.min(buf.length, end)

              for (var i = start; i < end; ++i) {
                ret += String.fromCharCode(buf[i] & 0x7F)
              }
              return ret
            }

            function latin1Slice (buf, start, end) {
              var ret = ''
              end = Math.min(buf.length, end)

              for (var i = start; i < end; ++i) {
                ret += String.fromCharCode(buf[i])
              }
              return ret
            }

            function hexSlice (buf, start, end) {
              var len = buf.length

              if (!start || start < 0) start = 0
              if (!end || end < 0 || end > len) end = len

              var out = ''
              for (var i = start; i < end; ++i) {
                out += toHex(buf[i])
              }
              return out
            }

            function utf16leSlice (buf, start, end) {
              var bytes = buf.slice(start, end)
              var res = ''
              for (var i = 0; i < bytes.length; i += 2) {
                res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
              }
              return res
            }

            Buffer.prototype.slice = function slice (start, end) {
              var len = this.length
              start = ~~start
              end = end === undefined ? len : ~~end

              if (start < 0) {
                start += len
                if (start < 0) start = 0
              } else if (start > len) {
                start = len
              }

              if (end < 0) {
                end += len
                if (end < 0) end = 0
              } else if (end > len) {
                end = len
              }

              if (end < start) end = start

              var newBuf = this.subarray(start, end)
              // Return an augmented `Uint8Array` instance
              newBuf.__proto__ = Buffer.prototype
              return newBuf
            }

            /*
             * Need to make sure that buffer isn't trying to write out of bounds.
             */
            function checkOffset (offset, ext, length) {
              if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
              if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
            }

            Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) checkOffset(offset, byteLength, this.length)

              var val = this[offset]
              var mul = 1
              var i = 0
              while (++i < byteLength && (mul *= 0x100)) {
                val += this[offset + i] * mul
              }

              return val
            }

            Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) {
                checkOffset(offset, byteLength, this.length)
              }

              var val = this[offset + --byteLength]
              var mul = 1
              while (byteLength > 0 && (mul *= 0x100)) {
                val += this[offset + --byteLength] * mul
              }

              return val
            }

            Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 1, this.length)
              return this[offset]
            }

            Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              return this[offset] | (this[offset + 1] << 8)
            }

            Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              return (this[offset] << 8) | this[offset + 1]
            }

            Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return ((this[offset]) |
                  (this[offset + 1] << 8) |
                  (this[offset + 2] << 16)) +
                  (this[offset + 3] * 0x1000000)
            }

            Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return (this[offset] * 0x1000000) +
                ((this[offset + 1] << 16) |
                (this[offset + 2] << 8) |
                this[offset + 3])
            }

            Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) checkOffset(offset, byteLength, this.length)

              var val = this[offset]
              var mul = 1
              var i = 0
              while (++i < byteLength && (mul *= 0x100)) {
                val += this[offset + i] * mul
              }
              mul *= 0x80

              if (val >= mul) val -= Math.pow(2, 8 * byteLength)

              return val
            }

            Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) checkOffset(offset, byteLength, this.length)

              var i = byteLength
              var mul = 1
              var val = this[offset + --i]
              while (i > 0 && (mul *= 0x100)) {
                val += this[offset + --i] * mul
              }
              mul *= 0x80

              if (val >= mul) val -= Math.pow(2, 8 * byteLength)

              return val
            }

            Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 1, this.length)
              if (!(this[offset] & 0x80)) return (this[offset])
              return ((0xff - this[offset] + 1) * -1)
            }

            Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              var val = this[offset] | (this[offset + 1] << 8)
              return (val & 0x8000) ? val | 0xFFFF0000 : val
            }

            Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 2, this.length)
              var val = this[offset + 1] | (this[offset] << 8)
              return (val & 0x8000) ? val | 0xFFFF0000 : val
            }

            Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return (this[offset]) |
                (this[offset + 1] << 8) |
                (this[offset + 2] << 16) |
                (this[offset + 3] << 24)
            }

            Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)

              return (this[offset] << 24) |
                (this[offset + 1] << 16) |
                (this[offset + 2] << 8) |
                (this[offset + 3])
            }

            Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)
              return ieee754.read(this, offset, true, 23, 4)
            }

            Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 4, this.length)
              return ieee754.read(this, offset, false, 23, 4)
            }

            Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 8, this.length)
              return ieee754.read(this, offset, true, 52, 8)
            }

            Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
              offset = offset >>> 0
              if (!noAssert) checkOffset(offset, 8, this.length)
              return ieee754.read(this, offset, false, 52, 8)
            }

            function checkInt (buf, value, offset, ext, max, min) {
              if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
              if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
              if (offset + ext > buf.length) throw new RangeError('Index out of range')
            }

            Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) {
                var maxBytes = Math.pow(2, 8 * byteLength) - 1
                checkInt(this, value, offset, byteLength, maxBytes, 0)
              }

              var mul = 1
              var i = 0
              this[offset] = value & 0xFF
              while (++i < byteLength && (mul *= 0x100)) {
                this[offset + i] = (value / mul) & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              byteLength = byteLength >>> 0
              if (!noAssert) {
                var maxBytes = Math.pow(2, 8 * byteLength) - 1
                checkInt(this, value, offset, byteLength, maxBytes, 0)
              }

              var i = byteLength - 1
              var mul = 1
              this[offset + i] = value & 0xFF
              while (--i >= 0 && (mul *= 0x100)) {
                this[offset + i] = (value / mul) & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
              this[offset] = (value & 0xff)
              return offset + 1
            }

            Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
              this[offset] = (value & 0xff)
              this[offset + 1] = (value >>> 8)
              return offset + 2
            }

            Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
              this[offset] = (value >>> 8)
              this[offset + 1] = (value & 0xff)
              return offset + 2
            }

            Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
              this[offset + 3] = (value >>> 24)
              this[offset + 2] = (value >>> 16)
              this[offset + 1] = (value >>> 8)
              this[offset] = (value & 0xff)
              return offset + 4
            }

            Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
              this[offset] = (value >>> 24)
              this[offset + 1] = (value >>> 16)
              this[offset + 2] = (value >>> 8)
              this[offset + 3] = (value & 0xff)
              return offset + 4
            }

            Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                var limit = Math.pow(2, (8 * byteLength) - 1)

                checkInt(this, value, offset, byteLength, limit - 1, -limit)
              }

              var i = 0
              var mul = 1
              var sub = 0
              this[offset] = value & 0xFF
              while (++i < byteLength && (mul *= 0x100)) {
                if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
                  sub = 1
                }
                this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                var limit = Math.pow(2, (8 * byteLength) - 1)

                checkInt(this, value, offset, byteLength, limit - 1, -limit)
              }

              var i = byteLength - 1
              var mul = 1
              var sub = 0
              this[offset + i] = value & 0xFF
              while (--i >= 0 && (mul *= 0x100)) {
                if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
                  sub = 1
                }
                this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
              }

              return offset + byteLength
            }

            Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
              if (value < 0) value = 0xff + value + 1
              this[offset] = (value & 0xff)
              return offset + 1
            }

            Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
              this[offset] = (value & 0xff)
              this[offset + 1] = (value >>> 8)
              return offset + 2
            }

            Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
              this[offset] = (value >>> 8)
              this[offset + 1] = (value & 0xff)
              return offset + 2
            }

            Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
              this[offset] = (value & 0xff)
              this[offset + 1] = (value >>> 8)
              this[offset + 2] = (value >>> 16)
              this[offset + 3] = (value >>> 24)
              return offset + 4
            }

            Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
              if (value < 0) value = 0xffffffff + value + 1
              this[offset] = (value >>> 24)
              this[offset + 1] = (value >>> 16)
              this[offset + 2] = (value >>> 8)
              this[offset + 3] = (value & 0xff)
              return offset + 4
            }

            function checkIEEE754 (buf, value, offset, ext, max, min) {
              if (offset + ext > buf.length) throw new RangeError('Index out of range')
              if (offset < 0) throw new RangeError('Index out of range')
            }

            function writeFloat (buf, value, offset, littleEndian, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
              }
              ieee754.write(buf, value, offset, littleEndian, 23, 4)
              return offset + 4
            }

            Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
              return writeFloat(this, value, offset, true, noAssert)
            }

            Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
              return writeFloat(this, value, offset, false, noAssert)
            }

            function writeDouble (buf, value, offset, littleEndian, noAssert) {
              value = +value
              offset = offset >>> 0
              if (!noAssert) {
                checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
              }
              ieee754.write(buf, value, offset, littleEndian, 52, 8)
              return offset + 8
            }

            Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
              return writeDouble(this, value, offset, true, noAssert)
            }

            Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
              return writeDouble(this, value, offset, false, noAssert)
            }

            // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
            Buffer.prototype.copy = function copy (target, targetStart, start, end) {
              if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
              if (!start) start = 0
              if (!end && end !== 0) end = this.length
              if (targetStart >= target.length) targetStart = target.length
              if (!targetStart) targetStart = 0
              if (end > 0 && end < start) end = start

              // Copy 0 bytes; we're done
              if (end === start) return 0
              if (target.length === 0 || this.length === 0) return 0

              // Fatal error conditions
              if (targetStart < 0) {
                throw new RangeError('targetStart out of bounds')
              }
              if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
              if (end < 0) throw new RangeError('sourceEnd out of bounds')

              // Are we oob?
              if (end > this.length) end = this.length
              if (target.length - targetStart < end - start) {
                end = target.length - targetStart + start
              }

              var len = end - start

              if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
                // Use built-in when available, missing from IE11
                this.copyWithin(targetStart, start, end)
              } else if (this === target && start < targetStart && targetStart < end) {
                // descending copy from end
                for (var i = len - 1; i >= 0; --i) {
                  target[i + targetStart] = this[i + start]
                }
              } else {
                Uint8Array.prototype.set.call(
                  target,
                  this.subarray(start, end),
                  targetStart
                )
              }

              return len
            }

            // Usage:
            //    buffer.fill(number[, offset[, end]])
            //    buffer.fill(buffer[, offset[, end]])
            //    buffer.fill(string[, offset[, end]][, encoding])
            Buffer.prototype.fill = function fill (val, start, end, encoding) {
              // Handle string cases:
              if (typeof val === 'string') {
                if (typeof start === 'string') {
                  encoding = start
                  start = 0
                  end = this.length
                } else if (typeof end === 'string') {
                  encoding = end
                  end = this.length
                }
                if (encoding !== undefined && typeof encoding !== 'string') {
                  throw new TypeError('encoding must be a string')
                }
                if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
                  throw new TypeError('Unknown encoding: ' + encoding)
                }
                if (val.length === 1) {
                  var code = val.charCodeAt(0)
                  if ((encoding === 'utf8' && code < 128) ||
                      encoding === 'latin1') {
                    // Fast path: If `val` fits into a single byte, use that numeric value.
                    val = code
                  }
                }
              } else if (typeof val === 'number') {
                val = val & 255
              }

              // Invalid ranges are not set to a default, so can range check early.
              if (start < 0 || this.length < start || this.length < end) {
                throw new RangeError('Out of range index')
              }

              if (end <= start) {
                return this
              }

              start = start >>> 0
              end = end === undefined ? this.length : end >>> 0

              if (!val) val = 0

              var i
              if (typeof val === 'number') {
                for (i = start; i < end; ++i) {
                  this[i] = val
                }
              } else {
                var bytes = Buffer.isBuffer(val)
                  ? val
                  : Buffer.from(val, encoding)
                var len = bytes.length
                if (len === 0) {
                  throw new TypeError('The value "' + val +
                    '" is invalid for argument "value"')
                }
                for (i = 0; i < end - start; ++i) {
                  this[i + start] = bytes[i % len]
                }
              }

              return this
            }

            // HELPER FUNCTIONS
            // ================

            var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

            function base64clean (str) {
              // Node takes equal signs as end of the Base64 encoding
              str = str.split('=')[0]
              // Node strips out invalid characters like \n and \t from the string, base64-js does not
              str = str.trim().replace(INVALID_BASE64_RE, '')
              // Node converts strings with length < 2 to ''
              if (str.length < 2) return ''
              // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
              while (str.length % 4 !== 0) {
                str = str + '='
              }
              return str
            }

            function toHex (n) {
              if (n < 16) return '0' + n.toString(16)
              return n.toString(16)
            }

            function utf8ToBytes (string, units) {
              units = units || Infinity
              var codePoint
              var length = string.length
              var leadSurrogate = null
              var bytes = []

              for (var i = 0; i < length; ++i) {
                codePoint = string.charCodeAt(i)

                // is surrogate component
                if (codePoint > 0xD7FF && codePoint < 0xE000) {
                  // last char was a lead
                  if (!leadSurrogate) {
                    // no lead yet
                    if (codePoint > 0xDBFF) {
                      // unexpected trail
                      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                      continue
                    } else if (i + 1 === length) {
                      // unpaired lead
                      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                      continue
                    }

                    // valid lead
                    leadSurrogate = codePoint

                    continue
                  }

                  // 2 leads in a row
                  if (codePoint < 0xDC00) {
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    leadSurrogate = codePoint
                    continue
                  }

                  // valid surrogate pair
                  codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
                } else if (leadSurrogate) {
                  // valid bmp char, but last char was a lead
                  if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                }

                leadSurrogate = null

                // encode utf8
                if (codePoint < 0x80) {
                  if ((units -= 1) < 0) break
                  bytes.push(codePoint)
                } else if (codePoint < 0x800) {
                  if ((units -= 2) < 0) break
                  bytes.push(
                    codePoint >> 0x6 | 0xC0,
                    codePoint & 0x3F | 0x80
                  )
                } else if (codePoint < 0x10000) {
                  if ((units -= 3) < 0) break
                  bytes.push(
                    codePoint >> 0xC | 0xE0,
                    codePoint >> 0x6 & 0x3F | 0x80,
                    codePoint & 0x3F | 0x80
                  )
                } else if (codePoint < 0x110000) {
                  if ((units -= 4) < 0) break
                  bytes.push(
                    codePoint >> 0x12 | 0xF0,
                    codePoint >> 0xC & 0x3F | 0x80,
                    codePoint >> 0x6 & 0x3F | 0x80,
                    codePoint & 0x3F | 0x80
                  )
                } else {
                  throw new Error('Invalid code point')
                }
              }

              return bytes
            }

            function asciiToBytes (str) {
              var byteArray = []
              for (var i = 0; i < str.length; ++i) {
                // Node's code seems to be doing this and not & 0x7F..
                byteArray.push(str.charCodeAt(i) & 0xFF)
              }
              return byteArray
            }

            function utf16leToBytes (str, units) {
              var c, hi, lo
              var byteArray = []
              for (var i = 0; i < str.length; ++i) {
                if ((units -= 2) < 0) break

                c = str.charCodeAt(i)
                hi = c >> 8
                lo = c % 256
                byteArray.push(lo)
                byteArray.push(hi)
              }

              return byteArray
            }

            function base64ToBytes (str) {
              return base64.toByteArray(base64clean(str))
            }

            function blitBuffer (src, dst, offset, length) {
              for (var i = 0; i < length; ++i) {
                if ((i + offset >= dst.length) || (i >= src.length)) break
                dst[i + offset] = src[i]
              }
              return i
            }

            // ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
            // the `instanceof` check but they should be treated as of that type.
            // See: https://github.com/feross/buffer/issues/166
            function isInstance (obj, type) {
              return obj instanceof type ||
                (obj != null && obj.constructor != null && obj.constructor.name != null &&
                  obj.constructor.name === type.name)
            }
            function numberIsNaN (obj) {
              // For IE11 support
              return obj !== obj // eslint-disable-line no-self-compare
            }

            }).call(this)}).call(this,require("buffer").Buffer)
            },{"base64-js":1,"buffer":2,"ieee754":3}],3:[function(require,module,exports){
            /*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
            exports.read = function (buffer, offset, isLE, mLen, nBytes) {
              var e, m
              var eLen = (nBytes * 8) - mLen - 1
              var eMax = (1 << eLen) - 1
              var eBias = eMax >> 1
              var nBits = -7
              var i = isLE ? (nBytes - 1) : 0
              var d = isLE ? -1 : 1
              var s = buffer[offset + i]

              i += d

              e = s & ((1 << (-nBits)) - 1)
              s >>= (-nBits)
              nBits += eLen
              for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}

              m = e & ((1 << (-nBits)) - 1)
              e >>= (-nBits)
              nBits += mLen
              for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}

              if (e === 0) {
                e = 1 - eBias
              } else if (e === eMax) {
                return m ? NaN : ((s ? -1 : 1) * Infinity)
              } else {
                m = m + Math.pow(2, mLen)
                e = e - eBias
              }
              return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
            }

            exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
              var e, m, c
              var eLen = (nBytes * 8) - mLen - 1
              var eMax = (1 << eLen) - 1
              var eBias = eMax >> 1
              var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
              var i = isLE ? 0 : (nBytes - 1)
              var d = isLE ? 1 : -1
              var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

              value = Math.abs(value)

              if (isNaN(value) || value === Infinity) {
                m = isNaN(value) ? 1 : 0
                e = eMax
              } else {
                e = Math.floor(Math.log(value) / Math.LN2)
                if (value * (c = Math.pow(2, -e)) < 1) {
                  e--
                  c *= 2
                }
                if (e + eBias >= 1) {
                  value += rt / c
                } else {
                  value += rt * Math.pow(2, 1 - eBias)
                }
                if (value * c >= 2) {
                  e++
                  c /= 2
                }

                if (e + eBias >= eMax) {
                  m = 0
                  e = eMax
                } else if (e + eBias >= 1) {
                  m = ((value * c) - 1) * Math.pow(2, mLen)
                  e = e + eBias
                } else {
                  m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
                  e = 0
                }
              }

              for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

              e = (e << mLen) | m
              eLen += mLen
              for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

              buffer[offset + i - d] |= s * 128
            }

            },{}],4:[function(require,module,exports){
            module.exports = require('buffer');

            },{"buffer":2}]},{},[4])(4)
        });

        Buffer = window.Buffer.Buffer;
        createHash = window.createHash;


    }
    const ONE_TRILLION = 1000000000000;

    const CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";


    function bech32_polymod(values) {
        let generator = [0x3B6A57B2, 0x26508E6D, 0x1EA119FA, 0x3D4233DD, 0x2A1462B3];
        let chk = 1;
        for(value in values) {
            value = values[value];
            let top = chk >> 25
            chk = (chk & 0x1FFFFFF) << 5 ^ value
            for(let i = 0; i < 5; i++) {
                if((top >> i) & 1) {
                    chk ^= generator[i];
                } else {
                    chk ^= 0;
                }
            }
        }
        return chk;
    }


    function bech32_hrp_expand(hrp) {
        let arr = [];
        for(x in hrp) {
            x = hrp[x];
            arr.push(ord(x) >> 5);
        }
        arr.push(0);
        for(x in hrp) {
            x = hrp[x];
            arr.push(ord(x) & 31);
        }
        return arr;
    }


    const M = 0x2BC830A3;


    function bech32_verify_checksum(hrp, data) {
        return bech32_polymod(bech32_hrp_expand(hrp).concat(data)) == M;
    }


    function bech32_create_checksum(hrp, data) {
        let values = bech32_hrp_expand(hrp).concat(data);
        let polymod = bech32_polymod(values.concat([0, 0, 0, 0, 0, 0])) ^ M;
        let arr = [];
        for(let i = 0; i < 6; i++) {
            arr.push((polymod >> 5 * (5 - i)) & 31);
        }
        return arr;
    }


    function bech32_encode(hrp, data) {
        let combined = data.concat(bech32_create_checksum(hrp, data));
        let arr = [hrp, "1"];
        for(d in combined) {
            d = combined[d];
            arr.push(CHARSET[d]);
        }
        return arr.join("");
    }

    function ord(str) {
        return str.charCodeAt(0);
    }

    function any(iterable) {
        for(let i = 0; i < iterable.length; i++) {
            if(iterable[i]) {
                return true;
            }
        }
        return false;
    }

    function all(iterable) {
        for(let i = 0; i < iterable.length; i++) {
            if(!iterable[i]) {
                return false;
            }
        }
        return true;
    }


    function bech32_decode(bech) {
        let arr = [];
        for(x in bech) {
            x = bech[x];
            arr.push(ord(x) < 33 || ord(x) > 126);
        }
        if(any(arr) || (bech.toLowerCase() != bech)) {
            return [null, null];
        }
        bech = bech.toLowerCase();
        let pos = bech.lastIndexOf("1");
        if(pos < 1 || pos + 7 > bech.length || bech.length > 90) {
            return [null, null];
        }
        arr = [];
        for(x in bech.slice(pos + 1)) {
            x = bech.slice(pos + 1)[x];
            arr.push(CHARSET.includes(x));
        }
        if(!all(arr)) {
            return [null, null];
        }
        let hrp = bech.slice(0, pos);
        let data = [];
        for(x in bech.slice(pos + 1)) {
            x = bech.slice(pos + 1)[x];
            data.push(CHARSET.indexOf(x));
        }
        if(!bech32_verify_checksum(hrp, data)) {
            return [null, null];
        }
        return [hrp, data.slice(0, data.length - 6)]
    }


    function convertbits(data, frombits, tobits, pad = true) {
        let acc = 0;
        let bits = 0;
        let ret = [];
        let maxv = (1 << tobits) - 1;
        let max_acc = (1 << (frombits + tobits - 1)) - 1;
        for(value in data) {
            value = data[value];
            if(value < 0 || (value >> frombits))  {
                throw "Invalid Value";
            }
            acc = ((acc << frombits) | value) & max_acc;
            bits += frombits;
            while(bits >= tobits) {
                bits -= tobits;
                ret.push((acc >> bits) & maxv);
            }
        }
        if(pad) {
            if(bits) {
                ret.push((acc << (tobits - bits)) & maxv);
            }
        } else if(bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
            throw "Invalid bits";
        }
        return ret;
    }


    function encode_puzzle_hash(puzzle_hash, prefix) {
        encoded = bech32_encode(prefix, convertbits(puzzle_hash, 8, 5));
        return encoded;
    }

    function decode_puzzle_hash(address) {
        let d = bech32_decode(address);
        let hrpgot = d[0];
        let data = d[1];
        if(data == null) {
            throw "Invalid Address";
        }
        let decoded = convertbits(data, 5, 8, false);
        return decoded;
    }

    function bytes_to_hex(bytes) {
        if(bytes == null) {
            throw "Argument bytes of method bytes_to_hex is required and does not have a default value.";
        }
        let hex = "";
        for(let i = 0; i < bytes.length; i++) {
            if(bytes[i].toString(16).length == 0) {
                hex += "00";
            } else if(bytes[i].toString(16).length == 1) {
                hex += "0" + bytes[i].toString(16);
            } else {
                hex += bytes[i].toString(16);
            }
        }
        return hex;
    }

    function hex_to_bytes(hex) {
        if(hex == null) {
            throw "Argument hex of method hex_to_bytes is required and does not have a default value.";
        }
        let bytes = new Uint8Array(hex.length / 2);
        for(let i = 0; i < hex.length; i += 2) {
            bytes[i / 2] = parseInt(hex.substring(i, i + 2), 16);
        }
        return bytes;
    }

    function address_to_puzzle_hash(address) {
        return "0x" + bytes_to_hex(decode_puzzle_hash(address));
    }

    function puzzle_hash_to_address(puzzle_hash, prefix = "xch") {
        if(puzzle_hash.indexOf("0x") == 0) {
            puzzle_hash = puzzle_hash.substring(2);
        }
        return encode_puzzle_hash(hex_to_bytes(puzzle_hash), prefix);
    }

    function get_coin_info(parent_coin_info, puzzle_hash, amount_decimal) {
        return get_coin_info_mojo(parent_coin_info, puzzle_hash, parseInt(amount_decimal * ONE_TRILLION));
    }

    function get_coin_info_mojo(parent_coin_info, puzzle_hash, amount) {
        if(parent_coin_info.indexOf("0x") == 0) {
            parent_coin_info = parent_coin_info.substring(2);
        }
        if(puzzle_hash.indexOf("0x") == 0) {
            puzzle_hash = puzzle_hash.substring(2);
        }
        const a = Buffer.from(parent_coin_info, 'hex');
        const b = Buffer.from(puzzle_hash, 'hex');
        const fixPreLength = (num, len) => (Array(len).join(0) + num).slice(-len);
        let amountHex = amount.toString(16);
        const byte_count = (amount.toString(2).length + 8) >> 3
        amountHex = fixPreLength(amountHex, byte_count * 2)
        if (amountHex.length % 2 == 1) {
            amountHex = '0' + amountHex
        }
        const c = Buffer.from(amountHex, 'hex');

        const d = Buffer.concat([a, b, c], a.length + b.length + c.length);
        const hash = createHash('sha256');
        hash.update(d);
        return "0x" + hash.digest('hex');
    }

    return { address_to_puzzle_hash, puzzle_hash_to_address, get_coin_info, get_coin_info_mojo, bytes_to_hex, hex_to_bytes };
}));