import { PipeTransform } from '@angular/core';
import { AtOptionGroupComponent } from './at-option-group.component';
import { AtOptionComponent } from './at-option.component';
export declare type TFilterOption = (input?: string, option?: AtOptionComponent) => boolean;
export declare class AtOptionPipe implements PipeTransform {
    transform(options: AtOptionComponent[], input: string, filterOption: TFilterOption, serverSearch: boolean): AtOptionComponent[];
}
export declare class atSubOptionPipe implements PipeTransform {
    transform(groups: AtOptionGroupComponent[], input: string, filterOption: TFilterOption, serverSearch: boolean): AtOptionGroupComponent[];
}
export declare function defaultFilterOption(input: string, option: AtOptionComponent): boolean;