TypeScript 0,36,73,0,19,68,0,131 editorconfig travis-ci npm

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

2 years after Apache-2.0

Build Status npm version Downloads


Join the chat at https://gitter.im/Microsoft/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.


For the latest stable version:

npm install -g typescript

For our nightly builds:

npm install -g [email protected]


There are many ways to contribute to TypeScript.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.



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 Gulp tools and dev dependencies:

npm install -g gulp
npm install

Use one of the following to build and test:

gulp local            # Build the compiler into built/local 
gulp clean            # Delete the built compiler 
gulp LKG              # Replace the last known good with the built one.
                      # Bootstrapping step to be executed when the built compiler reaches a stable state.
gulp tests            # Build the test infrastructure using the built compiler. 
gulp 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>. 
gulp runtests-browser # Runs the tests using the built run.js file. Syntax is gulp runtests. Optional
                        parameters 'host=', 'tests=[regex], reporter=[list|spec|json|<more>]'.
gulp baseline-accept  # This replaces the baseline test results with the results obtained from gulp runtests.
gulp lint             # Runs tslint on the TypeScript source.
gulp help             # List the above commands. 


node built/local/tsc.js hello.ts


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

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