tsrs: a Rust port of the TypeScript compiler
tsrs is an attempt to make TypeScript type-checking faster and more memory-efficient while staying aligned with TypeScript's design, and to run the toolchain in WebAssembly environments such as browsers and Workers.
Logged at IST: 2026-10-20
What it is: Cloudflare, VoidZero, and Max Schwenk of Owner.com are developing tsrs, a Rust port of the TypeScript compiler, in collaboration with the TypeScript team and within the Oxc toolchain.
Gist: The project is explicitly not a fork intended to take over TypeScript's direction. Its stated aim is a faithful port that tracks the upstream team's language and implementation decisions. Cloudflare's early benchmarks report up to 8× faster checking and about 70% less memory than TypeScript 7.0 at the same number of checker workers; the announcement notes that TypeScript 7.1 beta itself is already up to 2.5× faster than 7.0, with some optimizations upstreamed from tsrs.
The Rust implementation is also motivated by WebAssembly: the team says its memory model makes it easier to integrate with a Wasm host, enabling uses in browsers and Workers. The project repository currently describes tsrs as an experimental replacement for the TypeScript 7 compiler and language server, with a browser playground and a goal of full conformance. Its README also documents unsupported options and known differences, so this is not yet a drop-in replacement to assume without testing.
Why it matters: A compiler port can be more than a language rewrite: the pitch combines faster checking with a smaller memory footprint and new deployment targets. The harder long-term question is whether the port can stay behaviorally aligned with TypeScript as the upstream compiler and language evolve.
Source: https://blog.cloudflare.com/typescript-rust-port/ Code and current status: https://github.com/oxc-project/tsrs Saved X post: https://x.com/voidzerodev/status/2112531443591020965