TypeScript - how to compile ts file to js

In this short article, we would like to show how to compile *.ts files to *.js files.

To complile TypeScript file to JavaScript file, tsc program is necessary. In the below, you will find single output and multiple output compilation descriptions.

Single *.ts file compilation example

Simple steps:

1. Create script.ts file:

   for (let i = 0; i < 5; ++i) {
       console.log('Hello world!');
   }

2. Run tsc command:

   tsc script.ts

   or for automatic compilation when script.ts file is changed use:

   tsc -w Script.ts

   Notes:

   • after compliation script.js file should be created,
   • -w parameter enables monitoring and recompilation when file is changed - files watching mode.

3. Run compiled program

   node Script.js

   Output:

   Hello world!
   Hello world!
   Hello world!
   Hello world!
   Hello world!

Multiple *.ts files to  single *.js file compilation example

Read this article for more details.

See also

1. Installation TypeScript Compiler (tsc)