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

• TypeScript in 5 minutes
• Programming handbook
• Homepage

Roadmap

For details on our planned features and future direction please refer to our roadmap.

Changes

We made the following code modifications to support the ETS development paradigm.

October 2021

• Support custom component struct syntax, and add StructDeclaration and EtsComponentExpression node type.

November 2021

• Support gotoDefinition for custom component name and arguments.
• Support completion of lifecycle for StructDeclaration type.
• Support @Builder decorator for function and method.

January 2022

• Optimize eTS language support.
• Support @BuilderParam decorator and custom container lambda syntax.
• Add jsDoc and displayParts info in getCompletionAtPosition interface.
• Support eTS language ScriptKind and Extension.
• Add PropertyAccessExpressionConditionCheck for eTS.

February 2022

• Support @Styles decorator and related syntax.
• Add check for struct name contain reserved tag name.
• Support stateStyles property.
• Performance optimization for eTS completion.
• Support @Extend and @Styles decorators for function.