import { EventEmitter } from '@angular/core';
import { FilterGroup, FilterItem } from './filter.types';
export declare class FilterComponent {
    groups: FilterGroup[];
    heading: string;
    /**
     * An event that is emitted when the Apply Filters button is pressed.
     *
     * The event will contain an array of filter groups.
     */
    filtersChange: EventEmitter<FilterGroup[]>;
    trackExpansion: (index: number) => string;
    trackFilterItem: (groupIndex: number, index: number) => string;
    onExpansionChange(filterGroup: FilterGroup): void;
    onCheckboxChange(event: Event, filterGroup: FilterGroup, filterItem: FilterItem): void;
    onClear(): void;
    onApply(): void;
}