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# TypeScript
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[TypeScript ](http://www.typescriptlang.org/ ) 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 ](http://www.typescriptlang.org/Playground ), and stay up to date via [our blog ](http://blogs.msdn.com/typescript ) and [twitter account ](https://twitter.com/typescriptlang ).
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## Installation
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```shell
npm install -g typescript
```
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## Usage
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```shell
tsc hello.ts
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```
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## Contribute
There are many ways to [contribute ](https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md ) to TypeScript.
* [Submit bugs ](https://github.com/Microsoft/TypeScript/issues ) and help us verify fixes as they are checked in.
* Review the [source code changes ](https://github.com/Microsoft/TypeScript/pulls ).
* Engage with other TypeScript users and developers on [StackOverflow ](http://stackoverflow.com/questions/tagged/typescript ).
* Join the [#typescript ](http://twitter.com/#!/search/realtime/%23typescript ) discussion on Twitter.
* [Contribute bug fixes ](https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md ).
* Read the language specification ([docx](http://go.microsoft.com/fwlink/?LinkId=267121), [pdf ](http://go.microsoft.com/fwlink/?LinkId=267238 )).
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## Documentation
* [Quick tutorial ](http://www.typescriptlang.org/Tutorial )
* [Programming handbook ](http://www.typescriptlang.org/Handbook )
* [Language specification ](http://go.microsoft.com/fwlink/?LinkId=267238 )
* [Homepage ](http://www.typescriptlang.org/ )
## Building
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1. Install [node ](http://nodejs.org/ ) if you haven't already
2. Install dependencies ([Jake](https://github.com/mde/jake), [mocha ](http://visionmedia.github.io/mocha/ ), [Chai ](http://chaijs.com/ ) and [browserify ](http://browserify.org/ ) the tool we use to build our compiler. To do this, run `npm install` .
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3. To use jake, run one of the following commands:
- jake local - This builds the compiler. The output is in built/local in the public directory
- jake clean - deletes the build compiler
- jake LKG - This replaces the LKG (last known good) version of the compiler with the built one.
- This is a bootstrapping step to be executed whenever the built compiler reaches a stable state.
- jake tests - This builds the test infrastructure, using the built compiler.
- jake runtests - This runs the tests, using the built compiler and built test infrastructure.
- You can also override the host or specify a test for this command. Use host=< hostName > or tests=< testPath > .
- jake baseline-accept - This replaces the baseline test results with the results obtained from jake runtests.
- jake -T lists the above commands.
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## Roadmap
For details on our planned features and future direction please refer to our [roadmap ](https://github.com/Microsoft/TypeScript/wiki/Roadmap ).