import type { Context } from "hono";
import type { MemoryEventBus } from "../../events/bus";
export type SSEWriter = (event: string, data: string) => void | Promise<void>;
export declare class SSEBroadcaster {
    private eventBus;
    private clients;
    private cleanups;
    constructor(eventBus: MemoryEventBus);
    addClient(writer: SSEWriter): void;
    removeClient(writer: SSEWriter): void;
    get clientCount(): number;
    destroy(): void;
    private subscribeToAll;
    private broadcast;
}
export declare function createSSERoute(broadcaster: SSEBroadcaster): (c: Context) => Response;
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