Ezno, a TypeScript checker written in Rust, is now open source

In plain words

Ezno is an open-source TypeScript type checker built with Rust, offering developers an alternative to the standard TypeScript compiler. It performs static type analysis for TypeScript code and is designed for developers working with TypeScript projects who want a different implementation approach. The tool launched in June 2023 and is available on GitHub for those interested in exploring Rust-based development tooling alternatives.

written from the facts on this page · September 2026

From the sources

Firstly, to not waste anyone's time, do not bother running this currently on any existing projects. It does not currently support import , loops, async and loads of other JavaScript features. This is an early release to showcase functions, object, events and basic typing. More of those features coming shortly, once the architecture has been initially tried out. If you haven't heard of Ezno before you can read the initial announcement for a idea of some features implemented in this release and the aims of the project. Ezno's checker is now open source 🎉 . Additionally I have spent the last week integrating it into the Oxc CLI . If you haven't heard of it before, Oxc is a suite of tools for…from github.com

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