@angular/fire
Version:
The official Angular library for Firebase.
39 lines • 5.84 kB
JavaScript
import { asyncScheduler, Observable } from 'rxjs';
import { map, pairwise, startWith } from 'rxjs/operators';
function _fromRef(ref, scheduler = asyncScheduler) {
return new Observable(subscriber => {
let unsubscribe;
if (scheduler != null) {
scheduler.schedule(() => {
unsubscribe = ref.onSnapshot({ includeMetadataChanges: true }, subscriber);
});
}
else {
unsubscribe = ref.onSnapshot({ includeMetadataChanges: true }, subscriber);
}
return () => {
if (unsubscribe != null) {
unsubscribe();
}
};
});
}
export function fromRef(ref, scheduler) {
return _fromRef(ref, scheduler);
}
export function fromDocRef(ref, scheduler) {
return fromRef(ref, scheduler)
.pipe(startWith(undefined), pairwise(), map(([priorPayload, payload]) => {
if (!payload.exists) {
return { payload, type: 'removed' };
}
if (!(priorPayload === null || priorPayload === void 0 ? void 0 : priorPayload.exists)) {
return { payload, type: 'added' };
}
return { payload, type: 'modified' };
}));
}
export function fromCollectionRef(ref, scheduler) {
return fromRef(ref, scheduler).pipe(map(payload => ({ payload, type: 'query' })));
}
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