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* Prototype resolving to JS when go-to-def aliases all resolve to ambient declarations * Add test infrastructure * Start fleshing out test coverage * Fix some go-to-def stuff * Finish lodash test case * Make go-to-implementation never return ambient results * Build new functionality into go-to-implementation * Update baselines * Two more test cases * Refine definition searches for unresolved imports * Revert "Build new functionality into go-to-implementation" This reverts commit 381799d0f104000c676334c8e08fcdff9ccac896. * Fix tests * Revert go-to-implementation changes * Wow a bunch of code was unnecessary * Update baselines and go-to-def test * Fix navigation on symbols that are not aliases but resolve through aliases in chain * Temporarily replace go-to-def with new command implementation * Revert "Temporarily replace go-to-def with new command implementation" This reverts commit 34c6cfdebbb9e2506ea5e6d528d2cb57b2cdeb2e. * Revert "Wow a bunch of code was unnecessary" This reverts commit 1cb2ba646c9e80d1ca08b6fc3f6a2219aac44f67. * Bring back some deleted code needed for a new test case * Clean up a little * Rename more stuff * Update test * Update API baseline * Temporarily replace go-to-def with new command implementation * PR review fixes * Fix getTopMostDeclarationNamesInFile * Rename local * Use hash set * Remove option from commandLineParser * Keep noDtsResolution project around * Handle AuxiliaryProject kind in ScriptInfo getDefaultProject etc. * Do not run updateGraph in the background for AuxiliaryProject * Don’t create auxiliary project outside of semantic mode * No-op on scheduled invalidation * Add comments to unit test * Sync compiler options to auxiliary project * Fix case sensitivity * Update extensionIsOk with new file extensions * PR feedback * Update API baseline * Mark scheduleInvalidateResolutionsOfFailedLookupLocations internal * Use same heuristics on property accesses of loosely-resolvable aliases as unresolvable named imports * Rename command, and no need to return the bound span * Update API baseline
TypeScript
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.
Installing
For the latest stable version:
npm install -g typescript
For our nightly builds:
npm install -g typescript@next
Contribute
There are many ways to contribute to TypeScript.
- Submit bugs and help us verify fixes as they are checked in.
- Review the source code changes.
- Engage with other TypeScript users and developers on StackOverflow.
- Help each other in the TypeScript Community Discord.
- Join the #typescript discussion on Twitter.
- Contribute bug fixes.
- Read the archived language specification (docx, pdf, md).
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.
Documentation
Building
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 ci
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 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.
Usage
node built/local/tsc.js hello.ts
Roadmap
For details on our planned features and future direction please refer to our roadmap.