import type { OffscreenElement } from './OffscreenElement.js';
export declare const propagationStopped: unique symbol;
export declare const eventPhase: unique symbol;
export declare class OffscreenEvent extends Event {
    private _target;
    [eventPhase]: Event['eventPhase'];
    constructor(type: string, _target: OffscreenElement);
    get target(): OffscreenElement;
    [propagationStopped]: boolean;
    stopImmediatePropagation(): void;
    stopPropagation(): void;
    get eventPhase(): number;
}