import { PipeTransform } from '@angular/core';
import * as i0 from "@angular/core";
export declare class FlattenPipe implements PipeTransform {
    transform<T>(input: T, shallow?: boolean): T;
    transform(input: any[], shallow?: boolean): any[];
    private flatten;
    static ɵfac: i0.ɵɵFactoryDeclaration<FlattenPipe, never>;
    static ɵpipe: i0.ɵɵPipeDeclaration<FlattenPipe, "flatten", false>;
}