An RxJS pipeable operator which multicasts the source stream and replays the latest emitted value.

It's a utility function kept for historical purposes. Since RxJS@^7.0.0 released, it's equivalent to:

import { share } from 'rxjs/operators';
function shareLatest<T>() {
return share<T>({
connector: () => new ReplaySubject(1)


MonoTypeOperatorFunction<T>: An Observable that shares the latest emitted value from the source Observable with all subscribers, and restarts the stream when it completes or errors.


import { filter, map } from "rxjs/operators"
import { shareLatest } from "@react-rxjs/core"
const activePlanetName$ = planet$.pipe(
filter((planet) => planet.isActive),
map((planet) =>,

See also