lecture.md

Typescript

https://www.typescriptlang.org/

TypeScript is Typed JavaScript. TypeScript adds types to JavaScript to help you speed up the development by catching errors before you even run the JavaScript code.

Here is best tutorial for beginners: https://www.typescripttutorial.net/

How to use?

npm install -D typescript tslint

• Create tsconfig.json in root directory

{
  "compilerOptions": {
    "module": "commonjs",
    "esModuleInterop": true,
    "target": "es6",
    "moduleResolution": "node",
    "sourceMap": true,
    "outDir": "dist"
  },
  "lib": ["es2015"]
}

• Create tslint.json with initial data inside

{
  "defaultSeverity": "error",
  "extends": ["tslint:recommended"],
  "jsRules": {},
  "rules": {
    "no-console": false
  },
  "rulesDirectory": []
}

• Add compile command to package.json

"scripts": {
    "start": "tsc && node dist/app.js",
    ...

it will compile all the ts files in root directory to dist directory.

• Create some file with ts - like src/app.ts and write some typescript code inside

interface User {
  name: string;
  id: number;
}

const user: User = {
  username: "Ivan",
  id: 1,
};
console.log(user);

• Run npm run start :)

---

Links

• repo: https://github.com/IgorKurkov/typescript-examples

• https://webformyself.com/urok-2-kurs-po-typescript-ts-tipy-dannyx-chast-1/

• https://www.digitalocean.com/community/tutorials/setting-up-a-node-project-with-typescript-ru

• https://devhints.io/typescript