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+import { OperatorFunction, ObservableInput } from '../types';
+import { operate } from '../util/lift';
+import { noop } from '../util/noop';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+import { innerFrom } from '../observable/innerFrom';
+
+/**
+ * Buffers the source Observable values until `closingNotifier` emits.
+ *
+ * <span class="informal">Collects values from the past as an array, and emits
+ * that array only when another Observable emits.</span>
+ *
+ * ![](buffer.png)
+ *
+ * Buffers the incoming Observable values until the given `closingNotifier`
+ * `ObservableInput` (that internally gets converted to an Observable)
+ * emits a value, at which point it emits the buffer on the output
+ * Observable and starts a new buffer internally, awaiting the next time
+ * `closingNotifier` emits.
+ *
+ * ## Example
+ *
+ * On every click, emit array of most recent interval events
+ *
+ * ```ts
+ * import { fromEvent, interval, buffer } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const intervalEvents = interval(1000);
+ * const buffered = intervalEvents.pipe(buffer(clicks));
+ * buffered.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link bufferCount}
+ * @see {@link bufferTime}
+ * @see {@link bufferToggle}
+ * @see {@link bufferWhen}
+ * @see {@link window}
+ *
+ * @param closingNotifier An `ObservableInput` that signals the
+ * buffer to be emitted on the output Observable.
+ * @return A function that returns an Observable of buffers, which are arrays
+ * of values.
+ */
+export function buffer<T>(closingNotifier: ObservableInput<any>): OperatorFunction<T, T[]> {
+  return operate((source, subscriber) => {
+    // The current buffered values.
+    let currentBuffer: T[] = [];
+
+    // Subscribe to our source.
+    source.subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        (value) => currentBuffer.push(value),
+        () => {
+          subscriber.next(currentBuffer);
+          subscriber.complete();
+        }
+      )
+    );
+
+    // Subscribe to the closing notifier.
+    innerFrom(closingNotifier).subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        () => {
+          // Start a new buffer and emit the previous one.
+          const b = currentBuffer;
+          currentBuffer = [];
+          subscriber.next(b);
+        },
+        noop
+      )
+    );
+
+    return () => {
+      // Ensure buffered values are released on finalization.
+      currentBuffer = null!;
+    };
+  });
+}