Added eslint, prettier & jest

.eslintignore

@@ -0,0 +1,2 @@
+*.js
+tests/*

.eslintrc.js

@@ -0,0 +1,24 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    node: true,
+  },
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier',
+  ],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+    project: './tsconfig.json',
+  },
+  plugins: ['@typescript-eslint'],
+  rules: {
+    /** your own rules. */
+    'no-unused-vars': 'off',
+    '@typescript-eslint/no-unused-vars': 'off',
+  },
+}

.husky/pre-commit

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

.prettierrc

@@ -1,6 +1,8 @@
 {
   "singleQuote": true,
   "trailingComma": "all",
+  "tabWidth": 2,
+  "semi": false,
   "overrides": [
     {
       "files": "*.ts",

babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', { targets: { node: 'current' } }],
+    '@babel/preset-typescript',
+  ],
+}

jest.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  testEnvironment: 'node',
+}

package.json

@@ -13,13 +13,27 @@
     "tslib": "~2.3.1"
   },
   "devDependencies": {
+    "@babel/core": "^7.18.5",
+    "@babel/preset-env": "^7.18.2",
+    "@babel/preset-typescript": "^7.17.12",
     "@types/cors": "^2.8.12",
     "@types/express": "^4.17.13",
+    "@types/jest": "^28.1.3",
     "@types/node": "~17.0.5",
+    "@types/sinon-express-mock": "^1.3.9",
+    "@typescript-eslint/eslint-plugin": "^5.29.0",
+    "@typescript-eslint/parser": "^5.29.0",
+    "babel-jest": "^28.1.1",
+    "eslint": "^8.18.0",
+    "eslint-config-prettier": "^8.5.0",
+    "husky": "^8.0.0",
+    "jest": "^28.1.1",
     "nodemon": "^2.0.15",
     "npm-run-all": "^4.1.5",
-    "prettier": "~2.5.1",
+    "prettier": "^2.7.1",
     "rimraf": "~3.0.2",
+    "sinon": "^14.0.0",
+    "sinon-express-mock": "^2.2.1",
     "tsc-alias": "^1.6.6",
     "tsc-watch": "^4.6.0",
     "tsutils": "~3.21.0",
@@ -31,6 +45,10 @@
     "clean": "rimraf dist/",
     "compile": "run-s clean tsc start",
     "dev": "nodemon",
-    "build": "run-s clean tsc"
+    "build": "run-s clean tsc",
+    "lint": "eslint src/",
+    "lint:fix": "eslint --cache --fix src/ && prettier --write src/",
+    "test": "jest",
+    "prepare": "husky install"
   }
 }

src/controllers/homeController.ts

@@ -1,5 +1,5 @@
-import {Request, Response} from 'express';
+import { Request, Response } from 'express'
 
 export async function home(req: Request, res: Response) {
-    res.send('Hello World!');
-}
+  res.status(200).send('Hello World!')
+}

src/database/database.ts

@@ -1,15 +1,16 @@
-import { connect } from "mongoose";
-let monURI = "mongodb://localhost:27017/express-typescript-demo";
+import { connect } from 'mongoose'
+// eslint-disable-next-line prefer-const
+let monURI = 'mongodb://localhost:27017/express-typescript-demo'
 
 const connectDB = async () => {
   try {
-    await connect(monURI);
-    console.log("MongoDB Connected...");
+    await connect(monURI)
+    console.log('MongoDB Connected...')
   } catch (err) {
-    console.error(err.message);
+    console.error(err.message)
     // Exit process with failure
-    process.exit(1);
+    process.exit(1)
   }
-};
+}
 
-export default connectDB;
+export default connectDB

tests/Features/example.spec.ts

@@ -0,0 +1,12 @@
+import { mockReq, mockRes } from 'sinon-express-mock'
+import { home } from '../../src/controllers/HomeController'
+
+describe('HomeController', () => {
+  test('should home controller return message', async () => {
+    const req = mockReq()
+    const res = mockRes()
+    await home(req, res)
+    expect(res.status.calledWith(200)).toBeTruthy()
+    expect(res.send.calledWith('Hello World!')).toBeTruthy()
+  })
+})

tests/Unit/example.test.ts

@@ -0,0 +1,5 @@
+describe('example', () => {
+  it('should pass', () => {
+    expect(true).toBe(true)
+  })
+})

tsconfig.json

@@ -13,8 +13,7 @@
       "*": ["node_modules/*", "src/types/*"],
       "@/*": ["./src/*"]
     },
+    "types": ["@types/jest"]
   },
-  "include": [
-    "src/**/*",
-  ]
+  "include": ["src/**/*"]
 }