/**
 * NotificationQueue：subagent 完成通知主 agent（对标 wave-agent NotificationQueue）。
 * enqueue → subscribe 回调 + dequeue 拉取。
 */
export interface Notification {
    type: string;
    sessionId: string;
    message: string;
    metadata?: Record<string, unknown>;
}
export type NotificationSubscriber = (notification: Notification) => void;
export declare class NotificationQueue {
    private queue;
    private subscribers;
    enqueue(notification: Notification): void;
    dequeue(): Notification | undefined;
    subscribe(subscriber: NotificationSubscriber): () => void;
    size(): number;
    clear(): void;
}