| import { MonoTypeOperatorFunction } from '../types'; |
| /** |
| * If the source observable completes without emitting a value, it will emit |
| * an error. The error will be created at that time by the optional |
| * `errorFactory` argument, otherwise, the error will be {@link EmptyError}. |
| * |
| *  |
| * |
| * ## Example |
| * ```ts |
| * import { fromEvent, timer } from 'rxjs'; |
| * import { throwIfEmpty, takeUntil } from 'rxjs/operators'; |
| * |
| * const click$ = fromEvent(document, 'click'); |
| * |
| * click$.pipe( |
| * takeUntil(timer(1000)), |
| * throwIfEmpty( |
| * () => new Error('the document was not clicked within 1 second') |
| * ), |
| * ) |
| * .subscribe({ |
| * next() { console.log('The button was clicked'); }, |
| * error(err) { console.error(err); } |
| * }); |
| * ``` |
| * |
| * @param errorFactory A factory function called to produce the |
| * error to be thrown when the source observable completes without emitting a |
| * value. |
| */ |
| export declare function throwIfEmpty<T>(errorFactory?: (() => any)): MonoTypeOperatorFunction<T>; |
