tsrs offers an experimental Rust implementation of TypeScript checking
Cloudflare and VoidZero are collaborating on tsrs, a Rust port intended to preserve TypeScript’s language behavior while reducing checking time and memory use. An experimental npm package is available, with stable conformance still a goal. The team also sees Rust’s WebAssembly support as a way to fit complete toolchains into constrained environments. This is an alternative implementation, not a proposal to redesign TypeScript.
Cloudflare · VoidZero · Oct 20, 2026
Why it matters
A compiler replacement needs agreement on diagnostics and emitted behavior as well as attractive performance measurements.
More context
Try the package on a representative project alongside the official compiler, comparing diagnostics and output. A browser playground is available. The repository documents compatibility gaps and distinguishes source-only fast-mode settings from published-package capabilities.
Keep in mind
The advertised speed and memory gains are early vendor benchmarks against named TypeScript versions and configurations. Diagnostic ordering and other remaining differences can affect existing tooling.
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