WebAssembly

Using WebAssembly, you can speed up key components of your server logic. Using Netlify Edge Functions, you can bring that to the edge. This allows developers to build more calculation intensive logic in languages such as C, C++, and Rust that gets pushed even closer to users.

In this example, we return a wasm computed response The answer is: 42.

// inlined Rust compiled code that prints "42"
const wasmCode = new Uint8Array([
  0,97,115,109,1,0,0,0,1,133,128,128,128,0,1,96,0,1,127,
  3,130,128,128,128,0,1,0,4,132,128,128,128,0,1,112,0,0,
  5,131,128,128,128,0,1,0,1,6,129,128,128,128,0,0,7,145,
  128,128,128,0,2,6,109,101,109,111,114,121,2,0,4,109,97,
  105,110,0,0,10,138,128,128,128,0,1,132,128,128,128,0,0,
  65,42,11
]);

const wasmModule = new WebAssembly.Module(wasmCode);
const wasmInstance = new WebAssembly.Instance(wasmModule);
const main = wasmInstance.exports.main as CallableFunction;

export default async () => {
  return new Response(`The answer is: ${main().toString()}`);
}

See this in action

• View the response from the Edge Function
• The Edge Function code: wasm.ts