import { OnInit, ElementRef, Renderer2, OnDestroy } from '@angular/core';
import { AnimationBuilder } from '@angular/animations';
import * as i0 from "@angular/core";
/**
 * Directive to handle the collapse and expand functionality of a host element.
 */
export declare class CollapseDirective implements OnInit, OnDestroy {
    private el;
    private builder;
    private renderer;
    /**
     * Indicates whether the host element is collapsed.
     * @input
     */
    collapsed: import("@angular/core").InputSignal<boolean>;
    /** Animation timings for collapse/expand animations.
     * @input
     */
    timings: import("@angular/core").InputSignal<string | number>;
    private _player?;
    private _firstExecution;
    constructor(el: ElementRef, builder: AnimationBuilder, renderer: Renderer2);
    ngOnInit(): void;
    private _collapse;
    private _expand;
    private _playAnimation;
    private _addClass;
    private _removeClass;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<CollapseDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<CollapseDirective, "[bkCollapse]", ["bkCollapse"], { "collapsed": { "alias": "collapsed"; "required": false; "isSignal": true; }; "timings": { "alias": "timings"; "required": false; "isSignal": true; }; }, {}, never, never, true, never>;
}