import { Handler } from '../../core/Handler.js';
export declare class ScrollWheelZoomHandler extends Handler {
    /** @type {number} */
    _delta: number;
    /** @type {WheelEvent} */
    _lastEvent: WheelEvent;
    _startTime: number | null | undefined;
    _timer: number | undefined;
    addHooks(): void;
    removeHooks(): void;
    /** @param {WheelEvent} e */
    _onWheelScroll(e: WheelEvent): void;
    _performZoom(): void;
}