.babelrc

@@ -1,3 +1,3 @@
 {
-  "presets": ["env"]
+  "presets": ["@babel/preset-env"]
 }

.editorconfig

@@ -1,3 +1,4 @@
+# @see: https://editorconfig.org/
 root = true
 
 [*]
@@ -6,3 +7,5 @@ insert_final_newline = true
 charset = utf-8
 indent_style = space
 indent_size = 2
+trim_trailing_whitespace = true
+quote_type = single

.eslintrc

@@ -11,5 +11,11 @@
     "class-methods-use-this": "off",
     "arrow-body-style": "off",
     "no-loop-func": "off"
+  },
+  "ignorePatterns": ["*.md", "*.png", "*.jpeg", "*.jpg"],
+  "settings": {
+    "react": {
+      "version": "18.2.0"
+    }
   }
 }

.github/FUNDING.yml

@@ -0,0 +1,3 @@
+# @see: https://docs.github.com/en/github/administering-a-repository/displaying-a-sponsor-button-in-your-repository
+github: trekhleb
+patreon: trekhleb

.github/workflows/CI.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [ 16.x ]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install dependencies
+        run: npm i
+
+      - name: Run linting
+        run: npm run lint
+
+      - name: Run tests
+        run: npm run coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1

.husky/.gitignore

@@ -0,0 +1 @@
+_

.husky/pre-commit

@@ -0,0 +1,5 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npm run lint
+# npm run test

.npmrc

@@ -0,0 +1 @@
+engine-strict=true

.nvmrc

@@ -0,0 +1 @@
+v16.15.0

BACKERS.md

@@ -0,0 +1,48 @@
+# Project Backers
+
+> You may support this project via ❤️️ [GitHub](https://github.com/sponsors/trekhleb) or ❤️️ [Patreon](https://www.patreon.com/trekhleb).
+
+## `O(2ⁿ)` Backers
+
+`null`
+
+## `O(n²)` Backers
+
+`null`
+
+## `O(n×log(n))` Backers
+
+`null`
+
+<!--
+<table>
+  <tr>
+    <td align="center">
+      <a href="[PROFILE_URL]">
+        <img
+          src="[PROFILE_IMG_SRC]"
+          width="50"
+          height="50"
+        />
+      </a>
+      <br />
+      <a href="[PROFILE_URL]">[PROFILE_NAME]</a>
+    </td>
+  </tr>
+</table>
+-->
+
+<!--
+<ul>
+  <li>
+    <a href="[PROFILE_URL]">
+      <img
+        src="[PROFILE_IMG_SRC]"
+        width="30"
+        height="30"
+      /></a>
+    &thinsp;
+    <a href="[PROFILE_URL]">[PROFILE_NAME]</a>
+  </li>
+</ul>
+-->

CONTRIBUTING.md

@@ -1,6 +1,25 @@
 ## Contributing
 
+**General Rules**
+
 - As much as possible, try to follow the existing format of markdown and code.
 - Don't forget to run `npm run lint` and `npm test` before submitting pull requests.
 - Make sure that **100%** of your code is covered by tests.
-- If you're adding **new** algorithms or data structures please provide **README.md** for each of them **with explanations** of the algorithm and **with links** to further readings.
+
+**Contributing New Translation**
+
+- Create new `README.xx-XX.md` file with translation alongside with 
+main `README.md` file where `xx-XX` is [locale and country/region codes](http://www.lingoes.net/en/translator/langcode.htm).
+For example `en-US`, `zh-CN`, `zh-TW`, `ko-KR` etc.
+- You may also translate all other sub-folders by creating 
+related `README.xx-XX.md` files in each of them.
+
+**Contributing New Algorithms**
+
+- Make your pull requests to be **specific** and **focused**. Instead of 
+contributing "several sorting algorithms" all at once contribute them all 
+one by one separately (i.e. one pull request for "Quick Sort", another one
+for "Heap Sort" and so on).
+- Provide **README.md** for each of the algorithms **with explanations** of
+the algorithm and **with links** to further readings.
+- Describe what you do in code using **comments**.