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// META: script=/common/gc.js
// META: script=resources/maybe-garbage-collect.js
// ├──> maybeGarbageCollectAndCleanupAsync
// └──> resolveGarbageCollection
/*---
esid: sec-finalization-registry.prototype.cleanupSome
info: |
FinalizationRegistry.prototype.cleanupSome ( [ callback ] )
1. Let finalizationRegistry be the this value.
2. If Type(finalizationRegistry) is not Object, throw a TypeError exception.
3. If finalizationRegistry does not have a [[Cells]] internal slot, throw a TypeError exception.
4. If callback is not undefined and IsCallable(callback) is false, throw a TypeError exception.
5. Perform ? CleanupFinalizationRegistry(finalizationRegistry, callback).
6. Return undefined.
FinalizationRegistry.prototype.unregister ( unregisterToken )
1. Let removed be false.
2. For each Record { [[Target]], [[Holdings]], [[UnregisterToken]] } cell that is an element of finalizationRegistry.[[Cells]], do
a. If SameValue(cell.[[UnregisterToken]], unregisterToken) is true, then
i. Remove cell from finalizationRegistry.[[Cells]].
ii. Set removed to true.
3. Return removed.
---*/
let token = {};
let finalizationRegistry = new FinalizationRegistry(function() {});
function emptyCells() {
let target = {};
finalizationRegistry.register(target, 'target!', token);
let prom = maybeGarbageCollectAndCleanupAsync(target);
target = null;
return prom;
}
promise_test(() => {
return (async () => {
assert_implements(
typeof FinalizationRegistry.prototype.cleanupSome === 'function',
'FinalizationRegistry.prototype.cleanupSome is not implemented.'
);
await emptyCells();
let called = 0;
let res = finalizationRegistry.unregister(token);
assert_equals(res, true, 'unregister target before iterating over it in cleanup');
finalizationRegistry.cleanupSome((holding) => {
called += 1;
});
assert_equals(called, 0, 'callback was not called');
})().catch(resolveGarbageCollection);
}, 'Cleanup might be prevented with an unregister usage');
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