tsrs

What you can do with it

• Run type checks on a TypeScript project without emitting files, using a single command
• Switch on fast mode to adapt checker counts and caches to your machine
• Use it as a language server in your editor, or try it in the browser playground

Ways a business could use it

• Cut the time that continuous integration spends type checking, which can lower build costs
• Speed up type checking and editor feedback for a small team working on a large TypeScript codebase

Can you use it commercially?

Free to use, change and sell, including in paid products. Keep the copyright notice.

Not legal advice. Read the project's licence file before building a product on it.

Getting it running

Install it as a development dependency with pnpm (pnpm add -D tsrs), then run it with pnpm exec tsrs.

Follow the official instructions in the project README.

Things to check

• Not yet at full conformance with TypeScript; known gaps and diagnostic differences are documented
• Stable release is still planned, so it is pre-stable
• Pull requests are closed, so outside contributions are not accepted
• Not affiliated with or endorsed by Microsoft

Who's talking about it

• raiscui (gh-trends): GitHub trends — 2026-10-28 (daily release) Featured in a roundup