import { FormControl, FormGroup } from '@angular/forms';
import { ValidationMessageMapperFn } from './validation-messages-map-fn';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
export declare class ValidationMessagesComponent {
    control: FormControl | FormGroup;
    errorMessages$: Observable<string>;
    mapper: ValidationMessageMapperFn;
    constructor(mapper: ValidationMessageMapperFn);
    ngOnInit(): void;
    ngAfterViewInit(): void;
}