import { OnInit, OnDestroy, EventEmitter } from '@angular/core';
import { FormControl } from '@angular/forms';
import { ApiVisa } from 'blg-akaun-ts-lib';
import { ReplaySubject } from 'rxjs';
import { SubSink } from 'subsink2';
import { IDropDownOptions } from '../models/drop-down-option.model';
export declare abstract class DropDownComponent<T> implements OnInit, OnDestroy {
    apiVisa: ApiVisa;
    required: boolean;
    label: string;
    entity: FormControl;
    entityChange: EventEmitter<FormControl>;
    entitySelected: EventEmitter<T>;
    protected subs: SubSink;
    options: IDropDownOptions<T>;
    serverSideFiltering: FormControl;
    serverSideSearching: boolean;
    filteredOptions$: ReplaySubject<T[]>;
    entityList: T[];
    selectedEntity: T;
    constructor();
    ngOnInit(): void;
    /**
     * Server-side typeahead for the drop-down.
     *
     * Replaces the SubQueryService round-trip (raw SELECT -> list of guids -> one
     * getByCriteria per guid) with a single criteria-based getByCriteria. The
     * concrete options object supplies the criteria via `searchCriteria`, which
     * carries both the keyword and whatever scoping the old SELECT's WHERE clause
     * had.
     */
    searchEntity(searchText: string): import("rxjs").Observable<T[]>;
    onSelect(entityGuid: string): void;
    valueSelector(option: T): any;
    ngOnDestroy(): void;
}