import type { SerializedDomEvent } from './protocol';
export interface OffscreenViewerHostOptions {
    el: HTMLElement;
    worker: Worker;
    canvas?: HTMLCanvasElement;
    pixelRatio?: number;
    terminateWorkerOnDispose?: boolean;
}
export declare function serializeDomEvent(event: Event): SerializedDomEvent;
export declare class OffscreenViewerHost extends EventTarget {
    #private;
    readonly el: HTMLElement;
    readonly worker: Worker;
    readonly canvas: HTMLCanvasElement;
    constructor(options: OffscreenViewerHostOptions);
    static isSupported(): boolean;
    init(): Promise<void>;
    request<T = unknown>(command: string, payload?: unknown): Promise<T>;
    dispose(): void;
}