ResizeObserver (and MutationObserver) not patched by zone.js

Current behavior

Example with delay (my use case) - https://stackblitz.com/edit/angular-f8evbx?file=src/app/app.component.spec.ts Simplified example - https://stackblitz.com/edit/angular-f8evbx-3ak8vv?file=src/app/app.component.spec.ts MutationObserver example - https://stackblitz.com/edit/angular-f8evbx-6wdpmj?file=src/app/app.component.ts

1. Use ResizeObserver (or MutationObserver + window.onresize to polyfill) on an element
2. (not relevant) Handle event into an observable with debouce or some other delay thingy
3. Write test for it using fakeAsync

Tests using fakeAsync fail, I’m forced to use setTimeout(expectations+done, delay) which causes unexpected delays. I tried using import 'zone.js/dist/zone-patch-resize-observer'; but it didn’t work.

On top of that, the timeout is flaky unless a full extra second or so is added to the delay.

Expected behavior

flush() should trigger events from ResizeObserver and MutationObserver

Other things

“zone.js”: “^0.8.26” “@angular/core”: “^6.1.0”, “rxjs”: “^6.2.0”,

Relevant: https://github.com/angular/zone.js/pull/1012

[ntvsx193]

Any progress?

[dylhunn]

ResizeObserver is an available polyfill. MutationObserver is already automatically patched.