Intro to TypeScript (Optional)

TypeScript adds static typing on top of JavaScript.

npm install -D typescript
npx tsc --init

tsconfig.json

{
  "target": "es2020",
  "module": "esnext",
  "strict": true,
  "sourceMap": true
}

Simple TS file:

function greet(name: string): string {
  return `Hi, ${name}`;
}
console.log(greet('World'));

Compile with npx tsc.

Benefits

• Early detection of type errors.
• Rich IDE autocomplete.
• Gradual adoption – rename .js to .ts one file at a time.