import { TooltipOptions } from './tooltip.types';
/**
 * Headless tooltip controller. Shows on hover/focus, hides on blur/leave/Escape,
 * and positions the content with floating-ui. Applies no visual styles.
 *
 * Markup:
 * ```html
 * <span data-c42-tooltip>
 *   <button data-c42-tooltip-trigger>Hover me</button>
 *   <div data-c42-tooltip-content>Helpful tip</div>
 * </span>
 * ```
 */
export declare class Tooltip {
    private readonly root;
    private readonly trigger;
    private readonly content;
    private readonly placement;
    private readonly offset;
    private readonly openDelay;
    private readonly closeDelay;
    private open;
    private timer;
    private stopAutoUpdate;
    private cleanups;
    constructor(root: HTMLElement, options?: TooltipOptions);
    private init;
    private onKeydown;
    private clearTimer;
    private scheduleOpen;
    private scheduleClose;
    show(): void;
    hide(): void;
    private position;
    get isOpen(): boolean;
    on<E extends Event = Event>(event: string, handler: (event: E) => void): () => void;
    destroy(): void;
}