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# TypeScript
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[](https://github.com/microsoft/TypeScript/actions?query=workflow%3ACI)
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[](https://dev.azure.com/typescript/TypeScript/_build?definitionId=7)
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[](https://www.npmjs.com/package/typescript)
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[](https://www.npmjs.com/package/typescript)
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[TypeScript ](https://www.typescriptlang.org/ ) 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 ](https://www.typescriptlang.org/play/ ), and stay up to date via [our blog ](https://blogs.msdn.microsoft.com/typescript ) and [Twitter account ](https://twitter.com/typescript ).
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Find others who are using TypeScript at [our community page ](https://www.typescriptlang.org/community/ ).
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## Installing
For the latest stable version:
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```bash
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npm install -g typescript
```
For our nightly builds:
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```bash
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npm install -g typescript@next
```
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## Contribute
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There are many ways to [contribute ](https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md ) to TypeScript.
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* [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 ).
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* Engage with other TypeScript users and developers on [StackOverflow ](https://stackoverflow.com/questions/tagged/typescript ).
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* Help each other in the [TypeScript Community Discord ](https://discord.gg/typescript ).
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* Join the [#typescript ](https://twitter.com/search?q=%23TypeScript ) discussion on Twitter.
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* [Contribute bug fixes ](https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md ).
* Read the archived language specification ([docx ](https://github.com/microsoft/TypeScript/blob/main/doc/TypeScript%20Language%20Specification%20-%20ARCHIVED.docx?raw=true ),
[pdf ](https://github.com/microsoft/TypeScript/blob/main/doc/TypeScript%20Language%20Specification%20-%20ARCHIVED.pdf?raw=true ), [md ](https://github.com/microsoft/TypeScript/blob/main/doc/spec-ARCHIVED.md )).
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This project has adopted the [Microsoft Open Source Code of Conduct ](https://opensource.microsoft.com/codeofconduct/ ). For more information see
the [Code of Conduct FAQ ](https://opensource.microsoft.com/codeofconduct/faq/ ) or contact [opencode@microsoft.com ](mailto:opencode@microsoft.com )
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with any additional questions or comments.
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## Documentation
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* [TypeScript in 5 minutes ](https://www.typescriptlang.org/docs/handbook/typescript-in-5-minutes.html )
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* [Programming handbook ](https://www.typescriptlang.org/docs/handbook/intro.html )
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* [Homepage ](https://www.typescriptlang.org/ )
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## Roadmap
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For details on our planned features and future direction please refer to our [roadmap ](https://github.com/microsoft/TypeScript/wiki/Roadmap ).
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## Changes
We made the following code modifications to support the ETS development paradigm.
### October 2021
* [x] Support custom component `struct` syntax, and add `StructDeclaration` and `EtsComponentExpression` node type.
### November 2021
* [x] Support `gotoDefinition` for custom component name and arguments.
* [x] Support completion of lifecycle for `StructDeclaration` type.
* [x] Support `@Builder` decorator for function and method.
### January 2022
* [x] Optimize eTS language support.
* [x] Support `@BuilderParam` decorator and custom container lambda syntax.
* [x] Add jsDoc and displayParts info in `getCompletionAtPosition` interface.
* [x] Support eTS language ScriptKind and Extension.
* [x] Add `PropertyAccessExpressionConditionCheck` for eTS.
### February 2022
* [x] Support `@Styles` decorator and related syntax.
* [x] Add check for `struct` name contain reserved tag name.
* [x] Support `stateStyles` property.
* [x] Performance optimization for eTS completion.
* [x] Support `@Extend` and `@Styles` decorators for function.
