import { Helper } from '../../providers/helper';
import { BaseFormFieldDirective } from '../abstracts/base-form-field-directive';
import { ElementListenersCollector } from '../../providers/listeners-collector';
export declare class FieldDateMaskDirective extends BaseFormFieldDirective {
    private helper;
    private listenerCollector;
    private format;
    private separator;
    private regex;
    private previousIsBackspace;
    constructor(helper: Helper, listenerCollector: ElementListenersCollector);
    onRender(): void;
    onChange(): void;
    onDestroy(): void;
    private checkValueOnInitialize;
    private elementIsValid;
    private prepareRegex;
    private onKeypress;
    private onKeydown;
    private onInput;
    private checkDateIsValid;
    private applyMask;
    private isBackspace;
}