File: source-phase-js-string.tentative.html

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<!DOCTYPE html>
<title>Testing import of WebAssembly source phase with js-string builtins</title>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script type=module>
setup({ single_test: true });

import source module from "./resources/js-string-module.wasm";

const instance = await WebAssembly.instantiate(module, {
  "wasm:js-string": {
    // Example builtin polyfill for function returning the number of uppercase letters
    newbuiltin: (str) => {
      if (typeof str !== "string") return 0;
      return (str.match(/[A-Z]/g) || []).length;
    }
  }
});

assert_equals(instance.exports.useBuiltins("hello"), 5);
assert_equals(instance.exports.useBuiltins(123), -1);

assert_equals(instance.exports.concatStrings("Hello", " World"));

assert_equals(instance.exports.useNewBuiltin("Hello World"), 2);

done();
</script>