Cloudflare and VoidZero are taking on tsrs, an experimental port of the TypeScript compiler to Rust, and will develop it as part of the Oxc JavaScript compiler toolchain, Cloudflare said in a blog post on October 20, 2026 . The companies are working with Max Schwenk of Owner.com, who started the port, and said the work is happening “in close collaboration with the TypeScript team.”

Cloudflare’s post, written by Boshen Chen, Dimitri Mitropoulos and Christoph Nakazawa, said early benchmarks show tsrs running up to 8x faster than TypeScript 7.0 and using about 70% less memory when both run the same number of type-check workers. The authors said the TypeScript 7.1 beta is itself up to 2.5x faster than 7.0, and that some of those optimizations were upstreamed from tsrs.

“To be clear, we are not forking TypeScript,” the authors wrote, adding that the TypeScript team should remain in full control of the language’s design and direction.…