<!DOCTYPE html>
<title>script type="webbundle" reuses webbundle resources</title>
<link
rel="help"
href="https://github.com/WICG/webpackage/blob/main/explainers/subresource-loading.md"
/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/test-helpers.js"></script>
<body>
<script>
setup(() => {
assert_true(HTMLScriptElement.supports("webbundle"));
});
const wbn_url = "../resources/wbn/subresource.wbn";
const wbn_suffix = "subresource.wbn";
const resource1 = "root.js";
const resource2 = "submodule.js";
const resource1_url = `../resources/wbn/${resource1}`;
const resource2_url = `../resources/wbn/${resource2}`;
let script1;
let script2;
function cleanUp() {
if (script1) {
script1.remove();
}
if (script2) {
script2.remove();
}
}
async function assertResource1CanBeFetched() {
const response = await fetch(resource1_url);
const text = await response.text();
assert_equals(text, "export * from './submodule.js';\n");
}
async function assertResource1CanNotBeFetched() {
const response = await fetch(resource1_url);
assert_equals(response.status, 404);
}
async function assertResource2CanBeFetched() {
const response = await fetch(resource2_url);
const text = await response.text();
assert_equals(text, "export const result = 'OK';\n");
}
function createScriptWebBundle1() {
return createWebBundleElement(wbn_url, /*resources=*/ [resource1]);
}
function createScriptWebBundle2(options) {
return createWebBundleElement(
wbn_url,
/*resources=*/ [resource2],
/*options=*/ options
);
}
async function appendScriptWebBundle1AndFetchResource1() {
clearWebBundleFetchCount();
script1 = createScriptWebBundle1();
document.body.append(script1);
await assertResource1CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 1);
}
function clearWebBundleFetchCount() {
performance.clearResourceTimings();
}
function webBundleFetchCount(web_bundle_suffix) {
return performance
.getEntriesByType("resource")
.filter((e) => e.name.endsWith(web_bundle_suffix)).length;
}
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Append script2 without removing script1.
// script2 should fetch the wbn again.
script2 = createScriptWebBundle2();
document.body.appendChild(script2);
await assertResource1CanBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 1);
}, "A webbundle should be fetched again when new script element is appended.");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Remove script1, then append script2
// script2 should reuse webbundle resources.
script1.remove();
script2 = createScriptWebBundle2();
document.body.append(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 0);
}, "'remove(), then append()' should reuse webbundle resources");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
clearWebBundleFetchCount();
script1 = createScriptWebBundle1();
await addElementAndWaitForLoad(script1);
clearWebBundleFetchCount();
// Remove script1, then append script2
// script2 should reuse webbundle resources.
// And it should also fire a load event.
script1.remove();
script2 = createScriptWebBundle2();
await addElementAndWaitForLoad(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 0);
}, "'remove(), then append()' should reuse webbundle resources and both scripts should fire load events");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
script1 = createWebBundleElement("nonexistent.wbn", []);
await addElementAndWaitForError(script1);
// Remove script1, then append script2
// script2 should reuse webbundle resources (but we don't verify that).
// And it should also fire an error event.
script1.remove();
script2 = createWebBundleElement("nonexistent.wbn", []);
await addElementAndWaitForError(script2);
}, "'remove(), then append()' should reuse webbundle resources and both scripts should fire error events");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Remove script1, then append script2 with an explicit 'same-origin' credentials mode.
script1.remove();
script2 = createScriptWebBundle2({ credentials: "same-origin" });
document.body.append(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 0);
}, "Should reuse webbundle resources if a credential mode is same");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Remove script1, then append script2 with a different credentials mode.
script1.remove();
script2 = createScriptWebBundle2({ credentials: "omit" });
document.body.append(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 1);
}, "Should not reuse webbundle resources if a credentials mode is different (same-origin vs omit)");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Remove script1, then append script2 with a different credentials mode.
script1.remove();
script2 = createScriptWebBundle2({ credentials: "include" });
document.body.append(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 1);
}, "Should not reuse webbundle resources if a credential mode is different (same-origin vs include");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Remove script1, then append the removed one.
script1.remove();
document.body.append(script1);
await assertResource1CanNotBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 0);
}, "'remove(), then append()' for the same element should reuse webbundle resources");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Multiple 'remove(), then append()' for the same element.
script1.remove();
document.body.append(script1);
script1.remove();
document.body.append(script1);
await assertResource1CanNotBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 0);
}, "Multiple 'remove(), then append()' for the same element should reuse webbundle resources");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Remove script1.
script1.remove();
// Then append script2 in a separet task.
await new Promise((resolve) => t.step_timeout(resolve, 0));
script2 = createScriptWebBundle2();
document.body.append(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 1);
}, "'remove(), then append() in a separate task' should not reuse webbundle resources");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Use replaceWith() to replace script1 with script2.
// script2 should reuse webbundle resources.
script2 = createScriptWebBundle2();
script1.replaceWith(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 0);
}, "replaceWith() should reuse webbundle resources.");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
await appendScriptWebBundle1AndFetchResource1();
clearWebBundleFetchCount();
// Move script1 to another document. Then append script2.
// script2 should reuse webbundle resources.
const another_document = new Document();
another_document.append(script1);
script2 = createScriptWebBundle2();
document.body.append(script2);
await assertResource1CanNotBeFetched();
await assertResource2CanBeFetched();
assert_equals(webBundleFetchCount(wbn_suffix), 0);
// TODO: Test the following cases:
// - The resources are not loaded from the webbundle in the new Document
// (Probably better to use a <iframe>.contentDocument)
// - Even if we move the script element back to the original Document,
// even immediately, the resources are not loaded from the webbundle in the
// original Document.
}, "append() should reuse webbundle resoruces even if the old script was moved to another document.");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
clearWebBundleFetchCount();
script1 = createWebBundleElement(
wbn_url + "?pipe=trickle(d0.1)",
[resource1]
);
document.body.appendChild(script1);
// While script1 is still loading, remove it and make script2
// reuse the resources.
script1.remove();
script2 = createWebBundleElement(
wbn_url + "?pipe=trickle(d0.1)",
[resource2]
);
await addElementAndWaitForLoad(script2);
assert_equals(webBundleFetchCount(wbn_suffix + "?pipe=trickle(d0.1)"), 1);
}, "Even if the bundle is still loading, we should reuse the resources.");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
script1 = createScriptWebBundle1();
document.body.appendChild(script1);
// Don't wait for the load event for script1.
script1.remove();
script2 = createScriptWebBundle2();
// Load event should be fired for script2 regardless of
// whether script1 fired a load or not.
await addElementAndWaitForLoad(script2);
}, "When reusing the resources with script2, a load event should be fired regardless of if the script1 fired a load");
promise_test(async (t) => {
t.add_cleanup(cleanUp);
script1 = createWebBundleElement("nonexistent.wbn", []);
document.body.appendChild(script1);
// Don't wait for the error event for script1.
script1.remove();
script2 = createWebBundleElement("nonexistent.wbn", []);
// Error event should be fired for script2 regardless of
// whether script1 fired an error event or not.
await addElementAndWaitForError(script2);
}, "When reusing the resources with script2, an error event should be fired regardless of if the script1 fired an error");
</script>
</body>
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