test_bug_2054717.html

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<!DOCTYPE html>

<meta charset=utf-8>

<title>Test dynamic import from a preloaded static dependency</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<body>

<script>

  SimpleTest.waitForExplicitFinish();

  const OK = "data:text/javascript,export default 1";

  const DEP_BODY =

    'import("' + OK + '").then(' +

    '() => { window.postMessage("inner-ok", "*"); }, ' +

    '(e) => { window.postMessage("inner-fail:" + e, "*"); });' +

    'export default 2;';

  const DEP = "data:text/javascript," + encodeURIComponent(DEP_BODY);

  const ROOT_BODY = 'import "' + DEP + '";';

  const ROOT = "data:text/javascript," + encodeURIComponent(ROOT_BODY);

  const ROOT2_BODY = 'import "' + DEP + '"; window.__outer = 1;';

  const ROOT2 = "data:text/javascript," + encodeURIComponent(ROOT2_BODY);

  window.addEventListener("message", (e) => {

    is(e.data, "inner-ok",

       "Dynamic import from the preloaded dependency should succeed.");

    ok(window.__outer == 1, "The second top-level module should have run.");

    SimpleTest.finish();

});

  const link = document.createElement("link");

  link.rel = "modulepreload";

  link.href = ROOT;

  link.addEventListener("load", () => {

    const s = document.createElement("script");

    s.type = "module";

    s.src = ROOT2;

    document.body.appendChild(s);

});

  document.head.appendChild(link);

</script>

</body>