export interface SignerFrameHandle {
    /**
     * Post `message` (which must carry a unique `requestId`) into the frame once it
     * is ready and resolve with the correlated `bounded:turnkey:result` payload.
     * Rejects on timeout or if the handle was disposed.
     */
    request(message: Record<string, unknown>, timeoutMs: number): Promise<Record<string, unknown>>;
    dispose(): void;
}
/** Mount the hidden signer frame. Callers MUST dispose() when done. */
export declare function openHiddenSignerFrame(): Promise<SignerFrameHandle>;