import type { ServerResponse } from 'node:http';
export interface SseEvent {
    event: string;
    data: unknown;
}
export declare class EventHub {
    private clients;
    private nextId;
    /** Attach a response as an SSE stream. Returns a detach function. */
    attach(res: ServerResponse): () => void;
    private detach;
    broadcast(event: string, data: unknown): void;
    get clientCount(): number;
}
//# sourceMappingURL=events.d.ts.map