Install TypeScript compiler in VS Code

If you need to run the typescript from VS Code terminal you need to install the typescript compiler either globally or in your workspace.

This typescript compiler will transpile the TypeScript code to JavaScript.

Following are the steps we need to install and compile TypeScript in VS Code.

• Install node.js Package Manager (npm).
• Install TypeScript globally (-g) by this command:

  npm install -g typescript
  

• If want to install TypeScript locally in a single project, you can use this command:

  npm install --save-dev typescript
  

• Test your install by checking the version.

  tsc --version
  

TypeScript HelloWorld:

Let's start with a simple Hello World example. Create a new folder HelloWorld and open in VS Code.

mkdir HelloWorld
cd HelloWorld
code .

Create a new file called helloworld.ts.

Add the following TypeScript code in helloworld.ts file.

let message: string = 'Hello World';
console.log(message);

To compile the TypeScript code, you can open the Integrated Terminal (Ctrl+`)

Run this command to compile helloworld.ts

tsc helloworld.ts

It will create a new helloworld.js JavaScript file in the same folder.

To run the javascript file, you can use this command:

node helloworld.js

It will run the javascript code and display the script output in console.