Cloudflare workers support wasm via JavaScript. At least I believe that if you write a worker in rust what happens is that CF wraps your wasm in the correct js to provide environment bindings.
In practice it make little to no difference, but CF workers are indeed js first
But they don't mention that Cloudflare workers supports rust, c... And just say "mainly js"
But they did add it for their own...
So, misleading...