/**
 * WebSocket connection pool for the delegation channel.
 *
 * Mirrors the SC-01 SseConnectionPool pattern with a 50-client cap,
 * 30-second heartbeat, and 64KB payload buffer limit.
 *
 * @module sidecar/server/ws/pool
 */
export interface WsConnection {
    id: string;
    subscribedDelegations: Set<string>;
}
/** Configuration options for the WS connection pool. */
export interface WsConnectionPoolOptions {
    heartbeatIntervalMs?: number;
    maxClients?: number;
    bufferLimitBytes?: number;
}
export type PoolMessage = {
    type: "subscribe";
    delegationId: string;
} | {
    type: "unsubscribe";
    delegationId: string;
} | {
    type: "ping";
} | {
    type: "event";
    payload: unknown;
};
/**
 * Manages a pool of WebSocket connections for the delegation channel.
 */
export declare class WsConnectionPool {
    #private;
    constructor(opts?: WsConnectionPoolOptions);
    get heartbeatMs(): number;
    get maxPayload(): number;
    /** Returns the number of active WS connections. */
    get clientCount(): number;
    /**
     * Register a new WS connection.
     *
     * @returns A unique connection ID.
     */
    addClient(): string;
    /** Deregister a WS connection. */
    removeClient(id: string): void;
    /** Subscribe a connection to a delegation ID. */
    subscribe(id: string, delegationId: string): void;
    /** Unsubscribe a connection from a delegation ID. */
    unsubscribe(id: string, delegationId: string): void;
    /** Start the heartbeat interval. */
    startHeartbeat(): void;
    /** Stop heartbeat and clear all connections. */
    stop(): void;
}
//# sourceMappingURL=pool.d.ts.map