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+import { combineLatest } from '../observable/combineLatest';
+import { OperatorFunction, ObservableInput } from '../types';
+import { joinAllInternals } from './joinAllInternals';
+
+export function combineLatestAll<T>(): OperatorFunction<ObservableInput<T>, T[]>;
+export function combineLatestAll<T>(): OperatorFunction<any, T[]>;
+export function combineLatestAll<T, R>(project: (...values: T[]) => R): OperatorFunction<ObservableInput<T>, R>;
+export function combineLatestAll<R>(project: (...values: Array<any>) => R): OperatorFunction<any, R>;
+
+/**
+ * Flattens an Observable-of-Observables by applying {@link combineLatest} when the Observable-of-Observables completes.
+ *
+ * `combineLatestAll` takes an Observable of Observables, and collects all Observables from it. Once the outer Observable completes,
+ * it subscribes to all collected Observables and combines their values using the {@link combineLatest} strategy, such that:
+ *
+ * * Every time an inner Observable emits, the output Observable emits
+ * * When the returned observable emits, it emits all of the latest values by:
+ *    * If a `project` function is provided, it is called with each recent value from each inner Observable in whatever order they
+ *      arrived, and the result of the `project` function is what is emitted by the output Observable.
+ *    * If there is no `project` function, an array of all the most recent values is emitted by the output Observable.
+ *
+ * ## Example
+ *
+ * Map two click events to a finite interval Observable, then apply `combineLatestAll`
+ *
+ * ```ts
+ * import { fromEvent, map, interval, take, combineLatestAll } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const higherOrder = clicks.pipe(
+ *   map(() => interval(Math.random() * 2000).pipe(take(3))),
+ *   take(2)
+ * );
+ * const result = higherOrder.pipe(combineLatestAll());
+ *
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link combineLatest}
+ * @see {@link combineLatestWith}
+ * @see {@link mergeAll}
+ *
+ * @param project optional function to map the most recent values from each inner Observable into a new result.
+ * Takes each of the most recent values from each collected inner Observable as arguments, in order.
+ * @return A function that returns an Observable that flattens Observables
+ * emitted by the source Observable.
+ */
+export function combineLatestAll<R>(project?: (...values: Array<any>) => R) {
+  return joinAllInternals(combineLatest, project);
+}