import { TemplateRef, ViewContainerRef, OnDestroy, ElementRef, OnInit } from '@angular/core';
import { Overlay } from '@angular/cdk/overlay';
import { TooltipPlacement } from './types';
import * as i0 from "@angular/core";
export declare class TooltipDirective implements OnInit, OnDestroy {
    private _overlayService;
    private _elementRef;
    private _viewRef;
    content: import("@angular/core").InputSignal<string | TemplateRef<any>>;
    placement: import("@angular/core").InputSignal<TooltipPlacement>;
    private _portal;
    private _overlayRef?;
    constructor(_overlayService: Overlay, _elementRef: ElementRef, _viewRef: ViewContainerRef);
    ngOnInit(): void;
    private _onMouseEnter;
    private _onMouseLeave;
    private _createOverlay;
    private _disposeOverlay;
    private _getPositions;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<TooltipDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TooltipDirective, "[bkTooltip]", ["bkTooltip"], { "content": { "alias": "bkTooltip"; "required": false; "isSignal": true; }; "placement": { "alias": "placement"; "required": false; "isSignal": true; }; }, {}, never, never, true, never>;
}