TypeScript Basics

Requirements

Recommended:

• node.js 8.11.3 LTS + npm installed
• An IDE with TypeScript support, e.g. Jetbrains WebStorm

Project setup

In order to have a minimal development environment for using TypeScript, execute the following commands on the command line:

• To create node project and package.json

npm init

• Install dependencies

npm install typescript --save
# short form
npm i typescript -S

• Edit package.json and add tsc and start script

{
  "name": "typescript-basics",
  "version": "1.0.0",
  "description": "",
  "private": true,
  "main": "index.js",
  "scripts": {
    "tsc": "tsc",
    "start": "npm run tsc"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "typescript": "^2.9.2"
  }
}

• Initialize TypeScript project

npm run tsc -- --init

• Create source folder and index.ts file with "Hello World" output (works on UNIX command line)

mkdir src
touch src/index.ts
echo "console.log('Hello World!');" > src/index.ts

• Build it

npm run start

• Run it

node src/index.js