import { OnInit, SimpleChanges, ElementRef } from '@angular/core';
export declare class InputAcceptDirective implements OnInit {
    private el;
    /**
     * What to allow as input (object of type AcceptKeys or string including any of the following):
     * <ul>
     * <li>en = allow english alphabet characters</li>
     * <li>ar = allow Arabic alphabet characters</li>
     * <li>digit = allow Numeric characters</li>
     * </ul>
     */
    accept: string | AcceptKeys;
    constructor(el: ElementRef);
    ngOnInit(): void;
    ngOnChanges(changes: SimpleChanges): void;
    getRestrictions(): void;
    showTooltip(): void;
    onKeyDown(event: any): void;
}
export interface AcceptKeys {
    en: boolean;
    ar: boolean;
    digit: boolean;
}