1 2# TypeScript 3 4[](https://github.com/microsoft/TypeScript/actions?query=workflow%3ACI) 5[](https://dev.azure.com/typescript/TypeScript/_build?definitionId=7) 6[](https://www.npmjs.com/package/typescript) 7[](https://www.npmjs.com/package/typescript) 8 9[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). 10 11Find others who are using TypeScript at [our community page](https://www.typescriptlang.org/community/). 12 13## Installing 14 15For the latest stable version: 16 17```bash 18npm install -g typescript 19``` 20 21For our nightly builds: 22 23```bash 24npm install -g typescript@next 25``` 26 27## Contribute 28 29There are many ways to [contribute](https://github.com/microsoft/TypeScript/blob/master/CONTRIBUTING.md) to TypeScript. 30* [Submit bugs](https://github.com/microsoft/TypeScript/issues) and help us verify fixes as they are checked in. 31* Review the [source code changes](https://github.com/microsoft/TypeScript/pulls). 32* Engage with other TypeScript users and developers on [StackOverflow](https://stackoverflow.com/questions/tagged/typescript). 33* Help each other in the [TypeScript Community Discord](https://discord.gg/typescript). 34* Join the [#typescript](https://twitter.com/search?q=%23TypeScript) discussion on Twitter. 35* [Contribute bug fixes](https://github.com/microsoft/TypeScript/blob/master/CONTRIBUTING.md). 36* Read the archived language specification ([docx](https://github.com/microsoft/TypeScript/blob/master/doc/TypeScript%20Language%20Specification%20-%20ARCHIVED.docx?raw=true), 37 [pdf](https://github.com/microsoft/TypeScript/blob/master/doc/TypeScript%20Language%20Specification%20-%20ARCHIVED.pdf?raw=true), [md](https://github.com/microsoft/TypeScript/blob/master/doc/spec-ARCHIVED.md)). 38 39This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see 40the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) 41with any additional questions or comments. 42 43## Documentation 44 45* [TypeScript in 5 minutes](https://www.typescriptlang.org/docs/handbook/typescript-in-5-minutes.html) 46* [Programming handbook](https://www.typescriptlang.org/docs/handbook/basic-types.html) 47* [Homepage](https://www.typescriptlang.org/) 48 49## Building 50 51In order to build the TypeScript compiler, ensure that you have [Git](https://git-scm.com/downloads) and [Node.js](https://nodejs.org/) installed. 52 53Clone a copy of the repo: 54 55```bash 56git clone https://github.com/microsoft/TypeScript.git 57``` 58 59Change to the TypeScript directory: 60 61```bash 62cd TypeScript 63``` 64 65Install [Gulp](https://gulpjs.com/) tools and dev dependencies: 66 67```bash 68npm install -g gulp 69npm ci 70``` 71 72Use one of the following to build and test: 73 74``` 75gulp local # Build the compiler into built/local. 76gulp clean # Delete the built compiler. 77gulp LKG # Replace the last known good with the built one. 78 # Bootstrapping step to be executed when the built compiler reaches a stable state. 79gulp tests # Build the test infrastructure using the built compiler. 80gulp runtests # Run tests using the built compiler and test infrastructure. 81 # You can override the specific suite runner used or specify a test for this command. 82 # Use --tests=<testPath> for a specific test and/or --runner=<runnerName> for a specific suite. 83 # Valid runners include conformance, compiler, fourslash, project, user, and docker 84 # The user and docker runners are extended test suite runners - the user runner 85 # works on disk in the tests/cases/user directory, while the docker runner works in containers. 86 # You'll need to have the docker executable in your system path for the docker runner to work. 87gulp runtests-parallel # Like runtests, but split across multiple threads. Uses a number of threads equal to the system 88 # core count by default. Use --workers=<number> to adjust this. 89gulp baseline-accept # This replaces the baseline test results with the results obtained from gulp runtests. 90gulp lint # Runs eslint on the TypeScript source. 91gulp help # List the above commands. 92``` 93 94 95## Usage 96 97```bash 98node built/local/tsc.js hello.ts 99``` 100 101 102## Roadmap 103 104For details on our planned features and future direction please refer to our [roadmap](https://github.com/microsoft/TypeScript/wiki/Roadmap). 105 106## Changes 107 108We made the following code modifications to support the ETS development paradigm. 109 110### October 2021 111 112* [x] Support custom component `struct` syntax, and add `StructDeclaration` and `EtsComponentExpression` node type. 113 114### November 2021 115 116* [x] Support `gotoDefinition` for custom component name and arguments. 117* [x] Support completion of lifecycle for `StructDeclaration` type. 118* [x] Support `@Builder` decorator for function and method. 119 120### January 2022 121 122* [x] Optimize eTS language support. 123* [x] Support `@BuilderParam` decorator and custom container lambda syntax. 124* [x] Add jsDoc and displayParts info in `getCompletionAtPosition` interface. 125* [x] Support eTS language ScriptKind and Extension. 126* [x] Add `PropertyAccessExpressionConditionCheck` for eTS. 127 128### February 2022 129 130* [x] Support `@Styles` decorator and related syntax. 131* [x] Add check for `struct` name contain reserved tag name. 132* [x] Support `stateStyles` property. 133* [x] Performance optimization for eTS completion. 134* [x] Support `@Extend` and `@Styles` decorators for function.
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