🔵 Setup Node Typescript

.eslintrc.json

"rules": {
    "camelcase":"off",
    "no-console":"off",
    "no-unused-vars": "warn",
    "class-methods-use-this": "off",
    "import/prefer-default-export": "off",
    "import/extensions": [
      "error",
      "always",
      {
        "ts": "never",
        "js": "never"
      }
    ],
    "consistent-return": "off"
  },
"settings": {
  "import/resolver": {
    "node": {
      "extensions": [".ts"]
    },
    "typescript": {}
  }
}

.lintstagedrc.js

module.exports = {
  '*.ts': 'yarn test --findRelatedTests'
}

babel.config.js

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

  ],
  plugins: [
    ['@babel/plugin-proposal-decorators', { legacy: true }],
    ['@babel/plugin-proposal-class-properties', { loose: true }],
  ],
};

jest.config.ts

import { pathsToModuleNameMapper } from 'ts-jest/utils';
import { compilerOptions } from './tsconfig.json';

/*
 * For a detailed explanation regarding each configuration property and type check, visit:
 * https://jestjs.io/docs/configuration
 */

export default {
  // Stop running tests after `n` failures
  bail: true,

  // Automatically clear mock calls and instances between every test
  clearMocks: true,

  // An array of glob patterns indicating a set of files for which coverage information should be collected
  collectCoverageFrom: [
    'src/controllers/*.ts',
    'src/repositories/*.ts',
    'src/services/*.ts',
    'src/middlewares/*.ts',
    'src/validators/*.ts',
  ],

  // An array of regexp pattern strings used to skip coverage collection
  coveragePathIgnorePatterns: [
    "/node_modules/"
  ],

  // Indicates which provider should be used to instrument code for coverage
  coverageProvider: 'v8',

  // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths, { prefix: '<rootDir>' }),

  // A preset that is used as a base for Jest's configuration
  preset: 'ts-jest',

    // The test environment that will be used for testing
  testEnvironment: "node",

    // A map from regular expressions to paths to transformers
  transform: undefined,
}

package.json

{
  "name": "my_app",
  "version": "1.0.0",
  "main": "src/server.ts",
  "license": "MIT",
  "scripts": {
    "dev": "tsnd -r tsconfig-paths/register --respawn --transpile-only --ignore-watch node_modules --no-notify src/server.ts",
    "test": "NODE_ENV=test jest --runInBand --no-cache",
    "test:coverage": "yarn test --coverage"
  }
}

tsconfig.json

{
  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig.json to read more about this file */

    /* Basic Options */
    "target": "es2017",
    "module": "commonjs",
    "lib": ["es6"],
    "allowJs": true,
    "outDir": "./dist",
    "rootDir": "./src",
    "removeComments": true,

    /* Strict Type-Checking Options */
    "strict": false,

     /* Module Resolution Options */
    "baseUrl": ".",
    "paths": {
      "@config/*": ["./src/config/*"],
      "@controllers/*": ["./src/controllers/*"],
      "@entities/*": ["./src/entities/*"],
      "@repositories/*": ["./src/repositories/*"],
      "@views/*": ["./src/views/*"],
      "@routers/*": ["./src/routers/*"],
      "@services/*": ["./src/services/*"]
    },
    "esModuleInterop": true,

    /* Experimental Options */
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,

    /* Advanced Options */
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true
  },
  "include": ["src/**/*"]
}