tsc compiler

Learn to convert .ts files to .js with the TypeScript compiler tsc.

The tsc compiler

tsc is the TypeScript compiler. It takes a .ts file, checks the types, and produces plain JavaScript by stripping type annotations. By default it creates a .js file with the same name.

tsc selam.ts
# selam.js is created

You can then run the output in Node or the browser.

The --noEmit flag

By default tsc produces JavaScript. With the --noEmit flag it only checks types and creates no file. This is common in build tools (e.g. Vite).

tsc --noEmit selam.ts
# only shows errors, no .js is created

Exercise A function to compile

Write a function named selamVer. Its parameter is ad: string, its return type is string. Its body returns "Merhaba, " + ad. Then print the result of selamVer("Dünya") with console.log.

Show example solution

function selamVer(ad: string): string {
  return "Merhaba, " + ad;
}
console.log(selamVer("Dünya"));

Test yourself

What does tsc do by default?
- Turns the .js file into .ts
- Only checks types, creates no file
- Deletes the .ts file
- Turns the .ts file into .js
Show answer

Turns the .ts file into .js — By default tsc compiles the .ts file and writes a .js file with the same name. The 'check only' behavior requires the --noEmit flag.

Output extension

// tsc app.ts çalışınca app.____ oluşur

Show answer

// tsc app.ts çalışınca app.js oluşur

tsc parts

tsc

TypeScript compiler
.ts

Source file
.js

Output file
--noEmit

Creates no file

Next lesson: tsconfig basics

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