TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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andy-ms findAllReferences/rename: Search in all open projects (#25648)
* findAllReferences/rename: Search in all open projects

* Avoid needing a dummy location when location is unused

* Remove Program#getDeclarationEmitPath

* Only iterate over enabled projects
Latest commit 93722c8 Jul 21, 2018
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.github Update issue template Jul 12, 2018
.vscode Migrate tscWatchMode to vfs Nov 22, 2017
bin Moved LKG folder to lib Jul 27, 2015
doc Fix typo in Array Type Literals section of spec Mar 28, 2018
lib Update LKG (#25470) Jul 5, 2018
scripts Build script updates Jul 10, 2018
src findAllReferences/rename: Search in all open projects (#25648) Jul 20, 2018
tests Ensure fixSpelling and importFixes still trigger on "Did you mean the… Jul 20, 2018
.editorconfig Use CRLF, not LF. Mar 2, 2015
.gitattributes Never normalize end-of-lines on clone/commit. May 31, 2015
.gitignore Adds failed test tracking Jun 18, 2018
.gitmodules Add prettier user test and fix associated crash (#23715) Apr 26, 2018
.mailmap Update authors for release 3.0 Jul 11, 2018
.npmignore update .npmignore May 21, 2018
.travis.yml Add release-3.0 to supported branches Jul 11, 2018
AUTHORS.md Update authors for release 3.0 Jul 11, 2018
CopyrightNotice.txt Baseline public API (#18897) Oct 3, 2017
Gulpfile.js Build script updates Jul 10, 2018
Jakefile.js Fixes 25657. Jakefile: make concatenateFiles third parameter optional. Jul 17, 2018
LICENSE.txt Add snapshot of compiler sources Jul 13, 2014
README.md Point VSTS build badge to results of the latest build (#25248) Jun 27, 2018
ThirdPartyNoticeText.txt Update header Jun 7, 2018
package-lock.json Update 'package-lock.json'. Jul 6, 2018
package.json Update version Jul 12, 2018
tslint.json Enable '--strictNullChecks' (#22088) May 22, 2018


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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 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.