import { ElementRef, OnChanges, OnInit, SimpleChanges } from '@angular/core';
import * as i0 from "@angular/core";
export declare class SlidingUnderlineDirective implements OnInit, OnChanges {
    private element;
    constructor(element: ElementRef<HTMLElement>);
    nggSlidingUnderline: any;
    key?: any;
    disabled?: boolean;
    ngOnInit(): void;
    ngOnChanges(changes: SimpleChanges): void;
    addAnimation(current: any, previous: any): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<SlidingUnderlineDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<SlidingUnderlineDirective, "[nggSlidingUnderline]", never, { "nggSlidingUnderline": { "alias": "nggSlidingUnderline"; "required": false; }; "key": { "alias": "key"; "required": false; }; "disabled": { "alias": "disabled"; "required": false; }; }, {}, never, never, false, never>;
}