import { PipeTransform } from '@angular/core';
import { IgxComboBase } from './combo.common';
import { IComboFilteringOptions } from './combo.component';
/** @hidden */
export declare class IgxComboCleanPipe implements PipeTransform {
    transform(collection: any[]): any[];
}
/** @hidden */
export declare class IgxComboFilteringPipe implements PipeTransform {
    transform(collection: any[], searchValue: any, displayKey: any, filteringOptions: IComboFilteringOptions, shouldFilter?: boolean): any[];
}
/** @hidden */
export declare class IgxComboGroupingPipe implements PipeTransform {
    combo: IgxComboBase;
    constructor(combo: IgxComboBase);
    transform(collection: any[], groupKey: any, valueKey: any): any[];
}
