export declare function listenFor({ type, context, sourceOrigin, listenOnce, }: {
    type: string;
    context?: string;
    sourceOrigin?: string;
    listenOnce?: boolean;
}, callback: (message: unknown, source: MessageEventSource) => unknown): void;
export declare function sendMessage({ recepient, context, targetOrigin, type, content, }: {
    recepient: Window;
    context?: string;
    targetOrigin?: string;
    type: string;
    content?: unknown;
}): void;