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