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Andrew Scott
c16b5e8290
The behavior of `ApplicationRef.isStable` changed in 16.1 due to https://github.com/angular/angular/commit/28c68f709cdc930e12bac51a266e7bf790656034. This change added a `share` to the `isStable` observable, which prevents additional subscribers from getting a value until a new one emits. One solution to the problem would be `shareReplay(1)`. However, that would increase the bundle size since we do not use `shareReplay` elsewhere. Instead, we don't even really need to share the observable. The `Observable` available in `ApplicationRef.isStable` before the above commit was the zone stable observable, without a `share`. The new behavior adds only an additional observable to the stream, `hasPendingTasks` (a `BehaviorSubject`). The observables in this stream are not expensive to subscribe to. The only one with side effects is the `isStable` (because it subscribes to onStable), but that one already has the `share` operator on it. Omitting the `share` in `ApplicationRef` also means that applications on `zoneless` will not have to pay the cost of the operator when we make zones optional because the zone stable observable is the only place we use it. PR Close #53541
Angular
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License: MIT