oxc-project/tsrs

Rust port of the TypeScript 7 type checker

Rising79NewRustApache-2.0 Last commit 10 hours ago www.npmjs.com/package/tsrs

Open on GitHub

Last 24 hours: +59; stars
Last 7 days: +120; stars
Last 30 days: +213; stars
Total stars: 213; created 16 days ago
Forks: 7; 7 contributors

Star history

Last 12 weeks · weekly cumulative stars · created Oct 1, 2026, zero before · computed from public GitHub star events

Why it’s rising: #61 in Rust this week · +120 stars this week

Rank in its topics

Position among repos ranked in each topic (min. 20 stars gained)

Rank of oxc-project/tsrs in each topic for today, this week and this month
Topic	Today	This week	This month
Rust	#13of 111	#61of 291	#99of 423

Health signals

Too new to assessChecked Oct 17, 2026

Too new to assess: the repository is less than 60 days old or has fewer than 10 commits. The signals below are shown for information only.

Commit activity: Commits every week since it was created (3 weeks) 1,755 commits on the default branch in 90 days
Maintainers: 4 active maintainers Top author: 71% of the last 63 commits
Issue responsiveness: Too few issues to tell 0 issues opened by others in 90 days
Pull requests: 36 merged, 7 closed, 7 open Of the latest 50 opened in 90 days
Releases: Last release: today 3 releases in the last 12 months
Project hygiene: License, CI and security policy
OpenSSF Scorecard: Not scanned Unknown, not counted against the project

Signals are computed automatically from public GitHub data. They are not an endorsement or a security audit. How health is computed

README

README.md

`tsrs`

tsrs is a drop-in replacement for the TypeScript 7 compiler and language server, written in Rust. Our goal is 100% conformance, with much lower memory use and faster type checking.

Get started

pnpm add -D tsrs
pnpm exec tsrs --noEmit

You can try tsrs today and give us feedback on performance, memory usage, and conformance. Try checking and emitting code in the browser playground.

Conformance

tsrs currently targets the main branch of microsoft/TypeScript. We aim to release a stable version against TypeScript 7.1 with 100% conformance. In our testing on existing projects, we have yet to find a correctness bug in tsrs.

There are known order issues: the pinned Go compiler can produce different diagnostics and traces depending on parallel parse, resolution, and check order, while tsrs canonicalizes some checker history by default. For the closest comparison, use --checkerAssignment go --noLazyMembers; tsgo parser and resolver races can still vary between runs.

--init and --showConfig are not supported. See compatibility and evidence for supported features and known gaps.

Extra features

@tsrs/wasm provides WebAssembly support targeting wasm32-wasip1 (WASI Preview 1).

Learn more

Contributing

Issues and pull requests are currently disabled until we have the bandwidth to triage them.

See the contributing guide for building from source and running the suites, the Code of Conduct, and security policy for reporting vulnerabilities.

Acknowledgments

We thank the following organizations and contributors:

Depot CI for sponsoring our continuous integration.
Owner.com for sponsoring the initial work.
Max Schwenk for the port.
@walkerdb for improvements to the project.
@JiangWeixian for transferring the tsrs npm package name.

We extend special thanks to the TypeScript team for their support.

License

tsrs is a derivative of TypeScript (Copyright Microsoft Corporation), licensed under Apache-2.0. The bundled lib.*.d.ts files are TypeScript's. See NOTICE for attribution. Not affiliated with or endorsed by Microsoft.