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