import { AfterViewInit, ChangeDetectorRef, ElementRef, OnChanges, Renderer2, SimpleChanges } from '@angular/core';
import { NgFormControlErrorsContent } from './ng-form-control-errors-content';
export declare class NgFormControlErrorsInvalid implements AfterViewInit, OnChanges {
    private element;
    private renderer;
    private cdr;
    private hasClasses;
    private controlErrorsContent;
    classes: string[];
    constructor(element: ElementRef, renderer: Renderer2, cdr: ChangeDetectorRef, hasClasses: string, controlErrorsContent: NgFormControlErrorsContent);
    ngOnChanges(changes: SimpleChanges): void;
    ngAfterViewInit(): void;
    controlErrorsInvalid: string[] | string;
    update(): void;
    hasClass(className: string): boolean;
    readonly invalid: boolean;
}