97c557eb04
The `modifierFlagsCache` property is among the top properties that cause megamorphic stub cache misses when having `tsc` build itself. This is because it's added sort of randomly to a whole lot of different objects, at arbitrary points after their initialization. This also means that `modifierFlagsCache` is often not present on the instances, which means that when missing on the megamorphic stub cache, Node/V8 has to compute `NonExistent` handlers for the relevant inline caches. It's a lot cheaper to just make sure that the property is always existent on the instance, and ideally also at the same offset. This change ensures exactly that. Drive-by-fix: Also make sure that `transformFlags` (and `parent`) is always at the same offset for `Node` objects. |
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| bin | ||
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| src | ||
| tests | ||
| .editorconfig | ||
| .gitattributes | ||
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| .mailmap | ||
| .npmignore | ||
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| .travis.yml | ||
| AUTHORS.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| CopyrightNotice.txt | ||
| Gulpfile.js | ||
| Jakefile.js | ||
| LICENSE.txt | ||
| package.json | ||
| README.md | ||
| ThirdPartyNoticeText.txt | ||
| tslint.json | ||
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.
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.
- Join the #typescript discussion on Twitter.
- Contribute bug fixes.
- Read the 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 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.
Usage
node built/local/tsc.js hello.ts
Roadmap
For details on our planned features and future direction please refer to our roadmap.