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    Type Script

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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    TypeScript is a language for application-scale JavaScript. TypeScript adds optional types to JavaScript that support 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 typescript@next


    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 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

    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 runtests-browser # Runs the tests using the built run.js file. Syntax is jake runtests. Optional
                            parameters 'host=', 'tests=[regex], reporter=[list|spec|json|<more>]'.
    jake baseline-accept  # This replaces the baseline test results with the results obtained from jake runtests.
    jake lint             # Runs tslint on the TypeScript source.
    jake 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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