watify/index.html at main · mdn/watify · GitHub

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<!doctype html>
<html lang="en-US">
  <head>
    <meta charset="utf-8" />
    <title>hello-wasm example</title>
  </head>

  <body>
    <script type="module">
      import init, { watify } from "./pkg/watify.js";
      const w = `
(module
  (func $fac (export "fac") (param $x i64) (result i64)
    (return_call $fac-aux (local.get $x) (i64.const 1))
  )

  (func $fac-aux (param $x i64) (param $r i64) (result i64)
    (if (result i64) (i64.eqz (local.get $x))
      (then (return (local.get $r)))
      (else
        (return_call $fac-aux
          (i64.sub (local.get $x) (i64.const 1))
          (i64.mul (local.get $x) (local.get $r))
        )
      )
    )
  )
)`;
      init().then(() => {
        const wasm = watify(w);
        console.log(wasm);
        WebAssembly.instantiate(wasm, {}).then((result) => {
          const fac = result.instance.exports.fac;
          console.log(fac(5n));
        });
      });
    </script>
  </body>
</html>