import { WebSocket } from 'ws';
import type { CoreEvent } from '../core/types.js';
export declare function registerClient(ws: WebSocket): void;
/** Fan one CoreEvent frame out to every connected client, verbatim. */
export declare function broadcast(event: CoreEvent): void;
/** Current live client count (diagnostics / tests). */
export declare function clientCount(): number;
/** Close every client socket and clear the set (graceful shutdown). */
export declare function closeAllClients(): void;
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