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TypeScript: Cleaner JS Code

Name: TypeScript: Cleaner JS Code
Author: microsoft

Get reliable JavaScript output with TypeScript. For founders using JavaScript.

110,200 stars13,721 forksTypeScriptHealth Score 8/10Updated 8/14/2026100% free · open source

What it does

TypeScript helps you catch errors early and improve code maintainability by adding optional static typing to your JavaScript code

Install / run

npm install --save-dev typescript

When to use it

•When you're building a large-scale JavaScript application and want to reduce runtime errors
•When you're working with a team and want to ensure consistent coding practices
•When you want to take advantage of modern JavaScript features while still supporting older browsers

Quick start

1Create a new file with a .ts extension (e.g., greeter.ts) and add TypeScript code to it
2Configure the TypeScript compiler using the tsconfig.json file, e.g., `{ "compilerOptions": { "outDir": "./dist" } }`
3Compile your TypeScript code to JavaScript using the command `tsc greeter.ts`
4Run the compiled JavaScript code using Node.js, e.g., `node dist/greeter.js`
5Use the --watch flag to enable incremental compilation, e.g., `tsc --watch greeter.ts`

Ready-to-paste prompt

tsc --target es5 example.ts

Heads up: Make sure you have Node.js (version 14.17.0 or later) and npm installed on your system before installing and using TypeScript

Saves to your device

Topics

javascript

language

typechecker

typescript

How TypeScript: Cleaner JS Code works

Codeflow

Free to inspect

TypeScript: Cleaner JS Code is a very large TypeScript project (~1.1M lines across 15740 code files). It is a full software project: use it through its install path rather than reading it end to end. Last commit this month, Apache-2.0 license, has a test suite.

Size

Very large codebase

~1.1M lines · 15740 code files · days to read — use, don't read · partial scan

Setup

Developer setup

A real software project. Use it via its install path; don't expect to read it all.

Runs on

Node.js

No API keys detected

TypeScript 100%

What happens, step by step

Makes JavaScript code cleaner