Type Checker

Experimental

tsrs is experimental. It aims for full TypeScript compatibility, but some differences remain. See the compatibility status for supported features and known gaps.

tsrs is a Rust port of the TypeScript compiler and language server, incubated as part of Oxc. Cloudflare, VoidZero, and Max Schwenk are developing it in collaboration with the TypeScript team.

The goal is faster type checking and lower memory use while preserving upstream TypeScript behavior. Rust also enables WebAssembly support for running the compiler in browsers and other environments.

Quickstart

Install tsrs as a development dependency:

npm

$ npm add -D tsrs

pnpm

$ pnpm add -D tsrs

yarn

$ yarn add -D tsrs

bun

$ bun add -D tsrs

Run it from your project directory to check types without emitting JavaScript:

npx tsrs --noEmit

Links

• tsrs repository
• CLI usage
• Browser playground
• Introducing tsrs: A port of TypeScript to Rust