import { ElementRef, InjectionToken, OnDestroy, OnInit, Renderer2 } from '@angular/core';
import { NgControl } from '@angular/forms';
import { Observable, Subject } from 'rxjs';
export declare const NG_MODEL_ERROR_MAPPER: InjectionToken<unknown>;
export declare class NgModelErrorMessageDirective implements OnInit, OnDestroy {
    control: NgControl;
    errorMapper: (errors: any) => Observable<string | string[]>;
    private renderer;
    private el;
    smallElement: HTMLElement;
    parentElement: HTMLElement;
    destroyed$: Subject<unknown>;
    constructor(control: NgControl, errorMapper: (errors: any) => Observable<string | string[]>, renderer: Renderer2, el: ElementRef);
    ngOnInit(): void;
    ngOnDestroy(): void;
}