test_dynamicImportRelazify.html

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<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<title>Bug 2014283 - dynamic import must survive relazification of its referrer script</title>

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

<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">

</head>

<body>

<script>

SimpleTest.waitForExplicitFinish();

// A dynaimc import inside a relazifiable function.

const REFERRER_SOURCE = `

  function startImport() {

    return import("./module_simpleExport.mjs");

`;

async function runTest() {

  // A function is only relazifiable if it was delazified on demand: with the

  // default eager strategy the whole script is compiled up front and

  // AllowRelazify is never set.

  await SpecialPowers.pushPrefEnv({

    set: [["dom.script_loader.delazification.strategy", 0]],

});

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

  script.textContent = REFERRER_SOURCE;

  document.head.appendChild(script);

  const promise = startImport();

  SpecialPowers.Cu.getJSTestingFunctions().relazifyFunctions();

  const ns = await promise;

  is(ns.x, 42, "Dynamic import completes after the referrer is relazified");

  SimpleTest.finish();

runTest();

</script>

</body>

</html>