Cloudflare and VoidZero release tsrs, an AI-built Rust port of the TypeScript compiler
Teams on TypeScript 7 may see faster type checks, but the project is experimental and lacks watch mode and a language server.
Cloudflare, working with VoidZero and Max Schwenk of Owner.com inside the Oxc toolchain, has announced tsrs, a Rust port of the TypeScript compiler that it says is not a fork and that the TypeScript team continues to govern. The project claims type checking up to 8x faster and roughly 70% less memory than TypeScript 7.0 at the same worker count, and it can also be compiled to WebAssembly for use in browsers or on Workers. Schwenk reports having directed AI agents to build the port against TypeScript's 15,197 conformance cases, cutting a 37,000-file check from 19 GiB and 80 seconds to 7 seconds. Independent testing found a 5.3x gain with identical diagnostics, though against the newer TypeScript 7.1 beta the gain was closer to 2.7x, and one tester found an exit-code difference that could break CI scripts. The release is experimental, lacks watch mode and a language server, and tracks TypeScript 7, so teams on older versions should move to Microsoft's Go port first.
Why it matters
The project is positioned as a faster, lower-memory alternative to the official TypeScript 7.0 compiler, with the TypeScript team retaining control of the language's design. Its reported gains vary by test: up to 8x faster and 70% less memory in the headline claim, 5.3x in one independent test, and 2.7x against the TypeScript 7.1 beta. Anyone following TypeScript tooling should treat these numbers as early results from an experimental release, and note that teams on older TypeScript versions are pointed toward Microsoft's Go port instead.
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