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- import { OperatorFunction } from '../types';
- /**
- * Emits the single value at the specified `index` in a sequence of emissions
- * from the source Observable.
- *
- * <span class="informal">Emits only the i-th value, then completes.</span>
- *
- * 
- *
- * `elementAt` returns an Observable that emits the item at the specified
- * `index` in the source Observable, or a default value if that `index` is out
- * of range and the `default` argument is provided. If the `default` argument is
- * not given and the `index` is out of range, the output Observable will emit an
- * `ArgumentOutOfRangeError` error.
- *
- * ## Example
- *
- * Emit only the third click event
- *
- * ```ts
- * import { fromEvent, elementAt } from 'rxjs';
- *
- * const clicks = fromEvent(document, 'click');
- * const result = clicks.pipe(elementAt(2));
- * result.subscribe(x => console.log(x));
- *
- * // Results in:
- * // click 1 = nothing
- * // click 2 = nothing
- * // click 3 = MouseEvent object logged to console
- * ```
- *
- * @see {@link first}
- * @see {@link last}
- * @see {@link skip}
- * @see {@link single}
- * @see {@link take}
- *
- * @throws {ArgumentOutOfRangeError} When using `elementAt(i)`, it delivers an
- * `ArgumentOutOfRangeError` to the Observer's `error` callback if `i < 0` or the
- * Observable has completed before emitting the i-th `next` notification.
- *
- * @param index Is the number `i` for the i-th source emission that has happened
- * since the subscription, starting from the number `0`.
- * @param defaultValue The default value returned for missing indices.
- * @return A function that returns an Observable that emits a single item, if
- * it is found. Otherwise, it will emit the default value if given. If not, it
- * emits an error.
- */
- export declare function elementAt<T, D = T>(index: number, defaultValue?: D): OperatorFunction<T, T | D>;
- //# sourceMappingURL=elementAt.d.ts.map
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