import { OperatorFunction } from 'rxjs';
import { BuilderDone, BuilderError, FileOutput } from '../types';
/**
 * An operator function that emits file outputs.
 * @returns An OperatorFunction that can be used in an RxJS pipe.
 */
export declare function emitFileOutput(): OperatorFunction<BuilderDone<FileOutput> | BuilderError, BuilderDone<FileOutput> | BuilderError>;