| import { MonoTypeOperatorFunction } from '../types'; |
| /** |
| * Emits only the last `count` values emitted by the source Observable. |
| * |
| * <span class="informal">Remembers the latest `count` values, then emits those |
| * only when the source completes.</span> |
| * |
| *  |
| * |
| * `takeLast` returns an Observable that emits at most the last `count` values |
| * emitted by the source Observable. If the source emits fewer than `count` |
| * values then all of its values are emitted. This operator must wait until the |
| * `complete` notification emission from the source in order to emit the `next` |
| * values on the output Observable, because otherwise it is impossible to know |
| * whether or not more values will be emitted on the source. For this reason, |
| * all values are emitted synchronously, followed by the complete notification. |
| * |
| * ## Example |
| * Take the last 3 values of an Observable with many values |
| * ```ts |
| * import { range } from 'rxjs'; |
| * import { takeLast } from 'rxjs/operators'; |
| * |
| * const many = range(1, 100); |
| * const lastThree = many.pipe(takeLast(3)); |
| * lastThree.subscribe(x => console.log(x)); |
| * ``` |
| * |
| * @see {@link take} |
| * @see {@link takeUntil} |
| * @see {@link takeWhile} |
| * @see {@link skip} |
| * |
| * @throws {ArgumentOutOfRangeError} When using `takeLast(i)`, it delivers an |
| * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`. |
| * |
| * @param {number} count The maximum number of values to emit from the end of |
| * the sequence of values emitted by the source Observable. |
| * @return {Observable<T>} An Observable that emits at most the last count |
| * values emitted by the source Observable. |
| * @method takeLast |
| * @owner Observable |
| */ |
| export declare function takeLast<T>(count: number): MonoTypeOperatorFunction<T>; |
