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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.
* The specified function will also be called when the subscriber explicitly unsubscribes.
*
* ## Examples
* Execute callback function when the observable completes
* ```ts
* import { interval } from 'rxjs';
* import { take, finalize } from 'rxjs/operators';
* // emit value in sequence every 1 second
* const source = interval(1000);
* const example = source.pipe(
* take(5), //take only the first 5 values
* finalize(() => console.log('Sequence complete')) // Execute when the observable completes
* )
* const subscribe = example.subscribe(val => console.log(val));
* // results:
* // 0
* // 1
* // 2
* // 3
* // 4
* // 'Sequence complete'
* ```
* Execute callback function when the subscriber explicitly unsubscribes
* import { interval, timer, noop } from 'rxjs';
* import { finalize, tap } from 'rxjs/operators';
* const source = interval(100).pipe(
* finalize(() => console.log('[finalize] Called')),
* tap({
* next: () => console.log('[next] Called'),
* error: () => console.log('[error] Not called'),
* complete: () => console.log('[tap complete] Not called')
* })
* );
* const sub = source.subscribe({
* next: x => console.log(x),
* error: noop,
* complete: () => console.log('[complete] Not called')
* });
* timer(150).subscribe(() => sub.unsubscribe());
* // '[next] Called'
* // '[finalize] Called'
* @param {function} callback Function to be called when source terminates.
* @return A function that returns an Observable that mirrors the source, but
* will call the specified function on termination.
*/
export declare function finalize<T>(callback: () => void): MonoTypeOperatorFunction<T>;
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