--- /dev/null
+import { MonoTypeOperatorFunction } from '../types';
+/**
+ * Returns an Observable that mirrors the source Observable, but will call a specified function when
+ * the source terminates on complete or error.
+ * @param {function} callback Function to be called when source terminates.
+ * @return {Observable} An Observable that mirrors the source, but will call the specified function on termination.
+ * @method finally
+ * @owner Observable
+ */
+export declare function finalize<T>(callback: () => void): MonoTypeOperatorFunction<T>;