WinterJS is a JavaScript Service Worker written in Rust.
WinterJS uses the SpiderMonkey runtime to execute JavaScript (the same as the runtime used by Firefox), and follows the WinterCG specification to maximize compatibility with Cloudflare Workers, Deno Deploy, Vercel and other services (hence the name WinterJS).
WinterJS is not only extremely fast, but also can pass WASIX Compile to WebAssembly , so it fully supports running on Wasmer.