TypeScript
Microsoft's TypeScript language and compiler: typed JavaScript that compiles to plain JavaScript, plus the language service that powers editor features.
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microsoft/TypeScript
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- Language
- Go
- Licence
- Apache-2.0
- Last push
- 15 Oct 2026
On GitHub: TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
Open on GitHubThis repository contains the TypeScript compiler (tsc), the standard library type definitions (lib.*.d.ts) and the language service that editors such as VS Code use for autocompletion, errors and refactoring. You install it from npm as the typescript package.
Beyond the code, the issue tracker is a useful resource: many “why does TypeScript do this?” questions are answered in existing issues, and design discussions for upcoming features are held there. Release notes for each version explain new type-system features with examples.
For learning the language itself, start with the handbook at typescriptlang.org/docs and the online playground, then come to the repository when you hit edge cases or want to follow the project’s direction.
See also
- 0024 TypeScript basics: types, interfaces, unions and narrowing TypeScript adds type annotations to JavaScript and checks them before your code runs. These are the core ideas you need to read… Beginner · Concept · Any system Article Basics 15 Oct 2026
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