TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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Latest commit 441daa4 Jul 21, 2017 @minestarks minestarks committed on GitHub Merge pull request #17302 from minestarks/removeimportfix
Bugs in missing import codefix
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.vscode [Transforms] Merge master 07/11 into transform (#9697) Jul 18, 2016
bin Moved LKG folder to lib Jul 27, 2015
doc Update the logo to the one which our website uses. Mar 17, 2017
lib added es2017.intl (#15369) May 24, 2017
scripts Fix linter (#17312) Jul 20, 2017
src Merge pull request #17302 from minestarks/removeimportfix Jul 21, 2017
tests Merge pull request #17302 from minestarks/removeimportfix Jul 21, 2017
.editorconfig Use CRLF, not LF. Mar 2, 2015
.gitattributes Never normalize end-of-lines on clone/commit. May 31, 2015
.gitignore Add package lock to gitignore (#16770) Jul 5, 2017
.mailmap Update authors for TS 2.4 Jun 8, 2017
.npmignore Add more files to .npmignore Dec 15, 2016
.travis.yml just update issue template Jun 13, 2017
AUTHORS.md Update authors for TS 2.4 Jun 8, 2017
CONTRIBUTING.md Remove baseline-accept warning from CONTRIBUTING Oct 17, 2016
CopyrightNotice.txt Add snapshot of compiler sources Jul 13, 2014
Gulpfile.ts Enable "object-literal-shorthand" lint rule (#16987) Jul 7, 2017
Jakefile.js Add missing file unit tests Jun 29, 2017
LICENSE.txt Add snapshot of compiler sources Jul 13, 2014
README.md Updated links to use https and avoid redirects Jun 23, 2017
ThirdPartyNoticeText.txt [Transforms] Merge master 07/11 into transform (#9697) Jul 18, 2016
issue_template.md Issue template: Recommend to run `tsc` directly (#17246) Jul 17, 2017
jenkins.sh Update build scripts for npm5 May 30, 2017
netci.groovy merge Dec 14, 2016
package.json Fix gulp & types for gulp to 3 (#16771) Jun 27, 2017
pull_request_template.md No bold "Fixes" Feb 19, 2016
tslint.json Enable "object-literal-shorthand" lint rule (#16987) Jul 7, 2017


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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 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 opencode@microsoft.com 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.