Skip to content
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
Branch: master
Clone or download
sandersn DOM update 2019-11-19 (#35207)
* DOM update 2019-11-19

* update baselines

* update more baselines
Latest commit 75301c8 Nov 19, 2019
Type Name Latest commit message Commit time
Failed to load latest commit information.
.github Update issue reports agian (#34768) Oct 28, 2019
.vscode Improve the launch template Oct 19, 2019
bin Moved LKG folder to lib Jul 27, 2015
doc fix spelling errors Jan 28, 2019
lib Update LKG (#35128) Nov 15, 2019
loc/lcl LEGO: check in for master to temporary branch. Sep 10, 2019
scripts Revert "Skip costly tests" (#35197) Nov 19, 2019
src DOM update 2019-11-19 (#35207) Nov 19, 2019
tests DOM update 2019-11-19 (#35207) Nov 19, 2019
.dockerignore Fix up some of the ignore files, and removing the create language ser… Nov 6, 2019
.editorconfig Use CRLF, not LF. Mar 2, 2015
.eslintignore exclude *.generated.d.ts files Jun 14, 2019
.eslintrc.json @typescript-eslint/quotes Aug 20, 2019
.gitattributes Never normalize end-of-lines on clone/commit. May 31, 2015
.gitignore Fix up some of the ignore files, and removing the create language ser… Nov 6, 2019
.gitmodules Remove all submodules - just force clone and reset on run instead (#3… Sep 13, 2019
.mailmap Update .mailmap Oct 27, 2018
.npmignore Improve the gitignore / npm ignore Sep 24, 2019
.npmrc Remove lockfile, add to gitignore, and add npmrc preventing its gener… Aug 17, 2018
.travis.yml remove tslint, tslint:disable-next-line, update @typescript-eslint/* Jul 18, 2019
.yarnrc Adds a yarnrc which makes sure that the lockfile isn't generated for … Jun 12, 2019 Update authors for release 3.0 Jul 11, 2018 Added Microsoft code of conduct file Oct 5, 2018 fix: mardkown link syntax error (#35123) Nov 18, 2019
CopyrightNotice.txt Baseline public API (#18897) Oct 3, 2017
Dockerfile Add dockerfile based tests for `azure-sdk-for-js` and `office-ui-fabr… Jun 20, 2019
Gulpfile.js Revert "Skip costly tests" (#35197) Nov 19, 2019
LICENSE.txt Add snapshot of compiler sources Jul 13, 2014 Update the README links Oct 22, 2019
ThirdPartyNoticeText.txt Update ThirdPartyNoticeText to include KhronosGroup copyright notice … Jul 31, 2018
package.json Revert "Skip costly tests" (#35197) Nov 19, 2019


Build Status VSTS Build Status npm version Downloads

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.

Find others who are using TypeScript at our community page.


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 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.
                       # Some low-value tests are skipped when not on a CI machine - you can use the
                       # --skipPercent=0 command to override this behavior and run all tests locally.
                       # You can override the specific suite runner used or specify a test for this command.
                       # Use --tests=<testPath> for a specific test and/or --runner=<runnerName> for a specific suite.
                       # Valid runners include conformance, compiler, fourslash, project, user, and docker
                       # The user and docker runners are extended test suite runners - the user runner
                       # works on disk in the tests/cases/user directory, while the docker runner works in containers.
                       # You'll need to have the docker executable in your system path for the docker runner to work.
gulp runtests-parallel # Like runtests, but split across multiple threads. Uses a number of threads equal to the system
                       # core count by default. Use --workers=<number> to adjust this.
gulp baseline-accept   # This replaces the baseline test results with the results obtained from gulp runtests.
gulp lint              # Runs eslint 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.

You can’t perform that action at this time.