TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

javascript language typechecker typescript

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README.md

TypeScript

TypeScript is a language for application-scale JavaScript. TypeScript adds optional types, classes, and modules to JavaScript. TypeScript supports tools for large-scale JavaScript applications for any browser, for any host, on any OS. TypeScript compiles to readable, standards-based JavaScript. Try it out at the playground, and stay up to date via our blog and twitter account.

Contribute

There are many ways to contribute to TypeScript.

Submit bugs and help us verify fixes as they are checked in.
Review the source code changes.
Engage with other TypeScript users and developers on StackOverflow.
Join the #typescript discussion on Twitter.
Contribute bug fixes.
Read the language specification (docx, pdf).

Documentation

Building

In order to build the TypeScript compiler, ensure that you have Git and Node.js installed.

Clone a copy of the repo:

git clone https://github.com/Microsoft/TypeScript.git

Change to the TypeScript directory:

cd TypeScript

Install Jake tools and dev dependencies:

npm install -g jake
npm install

Use one of the following to build and test:

jake local           # Build the compiler into built/local 
jake clean           # Delete the built compiler 
jake LKG             # Replace the last known good with the built one.
                     # Bootstrapping step to be executed when the built compiler reaches a stable state.
jake tests           # Build the test infrastructure using the built compiler. 
jake runtests        # Run tests using the built compiler and test infrastructure. 
                     # You can override the host or specify a test for this command. 
                     # Use host=<hostName> or tests=<testPath>. 
jake baseline-accept # This replaces the baseline test results with the results obtained from jake runtests. 
jake -T              # List the above commands.

Usage

node built/local/tc.js hello.ts

Roadmap

For details on our planned features and future direction please refer to our roadmap.