Setting up

npm init -y # Setup a new project with NPM using the defaults
npm install --save-dev typescript # install typescript as a dev dependency
npx -c "tsc --init" # Create a basic configuration for our compiler

Create first typescript file

// index.ts
const x: number = 5;
console.log('#######', x);

Compile & Run:

npx -c "tsc -p ." && node .

Getting serious

• Set outDir to "./dist", and rootDir to "./src" in tsconfig.json
• Remove the generated index.js
• Move index.ts into src directory

Watch mode (TS)

• Add a new script inside your package.json, called: "watch-ts": "tsc -p . -w"
• Run npm run watch-ts
• Run node dist
• Change your index.ts to print something else
• Re-run node dist
• Profit!

Watch mode

• Run npm install --save-dev nodemon concurrently
• Add new scripts:

  {
    ...
    "run-js": "nodemon dist/index.js",
    "start": "concurrently 'npm:watch-ts' 'npm:run-js'"
  }

• Run npm start, and change files for fun and profit :)