/** Site Builder asks the cross-origin preview iframe to draw its own first screen; the site's runtime replies with a JPEG. */
export declare const PAGE_CAPTURE_REQUEST = "replo:page-capture:request";
export declare const PAGE_CAPTURE_RESPONSE = "replo:page-capture:response";
export interface PageCaptureRequestMessage {
    type: typeof PAGE_CAPTURE_REQUEST;
    requestId: string;
    width: number;
    height: number;
}
export type PageCaptureResponseMessage = {
    type: typeof PAGE_CAPTURE_RESPONSE;
    requestId: string;
    jpeg: ArrayBuffer;
    ms: number;
} | {
    type: typeof PAGE_CAPTURE_RESPONSE;
    requestId: string;
    jpeg: null;
    error: string;
};
export declare function isPageCaptureRequestMessage(value: unknown): value is PageCaptureRequestMessage;
export declare class PageCaptureError extends Error {
}
/** Parent side: ask `frame` to capture itself and resolve with its JPEG bytes. */
export declare function requestPageCapture({ frame, targetOrigin, width, height, timeoutMs, }: {
    frame: Window;
    targetOrigin: string;
    width: number;
    height: number;
    timeoutMs?: number;
}): Promise<{
    jpeg: ArrayBuffer;
    ms: number;
}>;