0652b29f62
Close #40387 Currently zone.js patches `setTimeout` and keeps a `tasksByHandleId` map to keep `timerId` <-> `ZoneTask` relationship. This is needed so that when `clearTimeout(timerId)` is called, zone.js can find the associated `ZoneTask`. Now zone.js set the `tasksByHandleId` map in the `scheduleTask` function, but if the `setTimeout` is running in the `FakeAsyncZoneSpec` or any other `ZoneSpec` with `onScheduleTask` hooks. The `scheduleTask` in `timer` patch may not be invoked. For example: ``` fakeAsync(() => { setTimeout(() => {}); tick(); }); ``` In this case, the `timerId` kept in the `tasksByHandleId` map is not cleared. This is because the `FakeAsyncZoneSpec` in the `onScheduleTask` hook looks like this. ``` onScheduleTask(delegate, ..., task) { fakeAsyncScheduler.setTimeout(task); return task; } ``` Because `FakeAsyncZoneSpec` handles the task itself and it doesn't call `parentDelegate.onScheduleTask`, therefore the default `scheduleTask` in the `timer` patch is not invoked. In this commit, the cleanup logic is moved from `scheduleTask` to `setTimeout` patch entry to avoid the memory leak. PR Close #40586
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