export type SendToUserResult = {
    ok: true;
} | {
    ok: false;
    reason: 'not_connected' | 'timeout' | 'send_failed';
    error?: Error;
};
export type MessageHandler = (id: any, properties: Record<string, any>, message: any) => void;
export declare function onMessage(handler: MessageHandler): void;
export declare function dispatchMessage(id: any, properties: Record<string, any>, message: any): void;
export declare function sendToUser(id: any, message: any, timeoutMs?: number): Promise<SendToUserResult>;