eslint & editorconfig

Author: always-maap

.editorconfig

@@ -0,0 +1,7 @@
+root = true
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true

.eslintrc

@@ -0,0 +1,41 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 12,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "rules": {
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/no-non-null-assertion": "off",
+    "no-constant-condition": "off",
+    "@typescript-eslint/no-explicit-any": "off",
+    "indent": [
+      "error",
+      2
+    ],
+    "linebreak-style": [
+      "error",
+      "unix"
+    ],
+    "quotes": [
+      "error",
+      "single"
+    ],
+    "semi": [
+      "error",
+      "always"
+    ]
+  }
+}

.husky/pre-commit

@@ -1,4 +1,5 @@
 #!/bin/sh
 . "$(dirname "$0")/_/husky.sh"
 
-npm test
+yarn lint
+yarn test

README.md

@@ -22,4 +22,4 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
-This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!

package.json

@@ -8,6 +8,7 @@
     "build": "tsc",
     "dev": "nodemon src/index.ts",
     "test": "jest",
+    "lint": "eslint src",
     "prepare": "husky install"
   },
   "repository": "git+https://github.com/always-maap/TS-Collection.git",
@@ -29,11 +30,15 @@
     "@babel/preset-typescript": "^7.13.0",
     "@types/jest": "^26.0.20",
     "@types/node": "^14.6.4",
+    "@typescript-eslint/eslint-plugin": "^4.27.0",
+    "@typescript-eslint/parser": "^4.27.0",
     "all-contributors-cli": "^6.20.0",
     "babel-jest": "^26.6.3",
+    "eslint": "^7.29.0",
     "husky": "^5.1.3",
     "jest": "^26.6.3",
     "nodemon": "^2.0.4",
+    "prettier": "^2.3.1",
     "ts-node": "^9.0.0",
     "typescript": "^4.0.2"
   }

src/BreadthFirstSearch.ts

@@ -7,8 +7,8 @@ export interface IBreadthFirstSearch<T> {
 
 export class BreadthFirstSearch<T> extends BinarySearchTree<T> implements IBreadthFirstSearch<T> {
   traverse() {
-    let node: BSTNode<T> | null = this.root,
-      data: Array<T> = [],
+    let node: BSTNode<T> | null = this.root;
+    const data: Array<T> = [],
       queue = new Queue<BSTNode<T> | null>();
     queue.enqueue(node);
     while (queue.size) {

src/DepthFirstSearch.ts

@@ -8,7 +8,7 @@ export interface IDepthFirstSearch<T> {
 
 export class DepthFirstSearch<T> extends BinarySearchTree<T> implements IDepthFirstSearch<T> {
   preOrder() {
-    let data: Array<T> = [];
+    const data: Array<T> = [];
     const traverse = (node: BSTNode<T> | null) => {
       if (node === null) return;
       data.push(node.value);
@@ -20,7 +20,7 @@ export class DepthFirstSearch<T> extends BinarySearchTree<T> implements IDepthFi
   }
 
   postOrder() {
-    let data: Array<T> = [];
+    const data: Array<T> = [];
     const traverse = (node: BSTNode<T> | null) => {
       if (node === null) return;
       if (node.left) traverse(node.left);
@@ -32,7 +32,7 @@ export class DepthFirstSearch<T> extends BinarySearchTree<T> implements IDepthFi
   }
 
   inOrder() {
-    let data: Array<T> = [];
+    const data: Array<T> = [];
     const traverse = (node: BSTNode<T> | null) => {
       if (node === null) return;
       if (node.left) traverse(node.left);

src/DoublyLinkedList.ts

@@ -26,7 +26,7 @@ export interface IDoublyLinkedList<T> {
 export class DoublyLinkedList<T> implements IDoublyLinkedList<T> {
   private _head: LinkedListNode<T> | null = null;
   private _tail: LinkedListNode<T> | null = null;
-  private length: number = 0;
+  private length = 0;
 
   push(val: T) {
     const newNode = new LinkedListNode(val);

src/Queue.ts

@@ -39,7 +39,7 @@ export class Queue<T> implements Queue<T> {
 
   dequeue(): T | undefined {
     if (!this.first) return undefined;
-    let nodeToBeRemove = this.first;
+    const nodeToBeRemove = this.first;
     if (this.first === this.last) {
       this.last = null;
     }

src/QuickSort.ts

@@ -1,4 +1,4 @@
-const pivot = (arr: Array<Number>, start = 0, end = arr.length - 1) => {
+const pivot = (arr: Array<number>, start = 0, end = arr.length - 1) => {
   const pivot = arr[start];
   let swapIndex = start;
   for (let i = start + 1; i <= end; i++) {