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+import { MonoTypeOperatorFunction, ObservableInput } from '../types';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+import { innerFrom } from '../observable/innerFrom';
+import { noop } from '../util/noop';
+
+/**
+ * Returns an Observable that skips items emitted by the source Observable until a second Observable emits an item.
+ *
+ * The `skipUntil` operator causes the observable stream to skip the emission of values until the passed in observable
+ * emits the first value. This can be particularly useful in combination with user interactions, responses of HTTP
+ * requests or waiting for specific times to pass by.
+ *
+ * ![](skipUntil.png)
+ *
+ * Internally, the `skipUntil` operator subscribes to the passed in `notifier` `ObservableInput` (which gets converted
+ * to an Observable) in order to recognize the emission of its first value. When `notifier` emits next, the operator
+ * unsubscribes from it and starts emitting the values of the *source* observable until it completes or errors. It
+ * will never let the *source* observable emit any values if the `notifier` completes or throws an error without
+ * emitting a value before.
+ *
+ * ## Example
+ *
+ * In the following example, all emitted values of the interval observable are skipped until the user clicks anywhere
+ * within the page
+ *
+ * ```ts
+ * import { interval, fromEvent, skipUntil } from 'rxjs';
+ *
+ * const intervalObservable = interval(1000);
+ * const click = fromEvent(document, 'click');
+ *
+ * const emitAfterClick = intervalObservable.pipe(
+ *   skipUntil(click)
+ * );
+ * // clicked at 4.6s. output: 5...6...7...8........ or
+ * // clicked at 7.3s. output: 8...9...10..11.......
+ * emitAfterClick.subscribe(value => console.log(value));
+ * ```
+ *
+ * @see {@link last}
+ * @see {@link skip}
+ * @see {@link skipWhile}
+ * @see {@link skipLast}
+ *
+ * @param notifier An `ObservableInput` that has to emit an item before the source Observable elements begin to
+ * be mirrored by the resulting Observable.
+ * @return A function that returns an Observable that skips items from the
+ * source Observable until the `notifier` Observable emits an item, then emits the
+ * remaining items.
+ */
+export function skipUntil<T>(notifier: ObservableInput<any>): MonoTypeOperatorFunction<T> {
+  return operate((source, subscriber) => {
+    let taking = false;
+
+    const skipSubscriber = createOperatorSubscriber(
+      subscriber,
+      () => {
+        skipSubscriber?.unsubscribe();
+        taking = true;
+      },
+      noop
+    );
+
+    innerFrom(notifier).subscribe(skipSubscriber);
+
+    source.subscribe(createOperatorSubscriber(subscriber, (value) => taking && subscriber.next(value)));
+  });
+}