Setting Up Nodejs with Typescript

Initialize and Install Typescript

npm init -y
npm install -D typescript @types/node

Update the package.json with a build script and change the type to module.

{
  "type": "module",
  "scripts": {
    "build": "tsc"
  },
}

Create a tsconfig.json file and use the NodeNextoption to handle ES Modules with interop between CommonJS modules.

{
    "compilerOptions": {
      "module": "NodeNext",
      "moduleResolution": "NodeNext",
      "target": "ES2020",
      "sourceMap": true,
      "outDir": "dist",
    },
    "include": ["src/**/*"],
  }

Use ES Modules

//hello.ts
export const hello = 'Hello World!';

//index.ts
import { hello } from './hello.js';

Use CommonJS Modules

//hello.cts
module.exports = 'Hey!';

//index.ts
import hola from './hello.cjs';

Next run

npm run build
node dist/index.js

Reference