Remove wait function and use delay instead.

Author: sainthkh

packages/net-stubbing/lib/server/util.ts

@@ -1,6 +1,7 @@
 import _ from 'lodash'
 import Debug from 'debug'
 import isHtml from 'is-html'
+import Promise from 'bluebird'
 import { IncomingMessage } from 'http'
 import {
   RouteMatcherOptionsGeneric,
@@ -220,17 +221,13 @@ export async function getBodyStream (body: Buffer | string | Readable | undefine
     return writable.end()
   }
 
-  delay ? await wait(sendBody, delay) : sendBody()
+  if (delay) {
+    await Promise.delay(delay)
+  }
 
-  return pt
-}
+  sendBody()
 
-function wait (fn, ms) {
-  return new Promise((resolve) => {
-    setTimeout(() => {
-      resolve(fn())
-    }, ms)
-  })
+  return pt
 }
 
 export function mergeDeletedHeaders (before: CyHttpMessages.BaseMessage, after: CyHttpMessages.BaseMessage) {