/**
 * Client Event Buffer
 *
 * Per-client bounded event buffering for backpressure.
 * Wraps client.send() with a queue that buffers events when the
 * client is under write pressure. Overflow disconnects the client
 * or drops oldest events depending on configuration.
 */
import type { GatewayMessage } from "./transport-protocol.js";
import type { TransportClient } from "./transport.js";
export type OverflowStrategy = "drop-oldest" | "disconnect";
export declare class ClientEventBuffer {
    private client;
    private maxBuffer;
    private overflow;
    private queue;
    constructor(client: TransportClient, maxBuffer?: number, overflow?: OverflowStrategy);
    push(message: GatewayMessage): void;
    drain(): void;
    get pending(): number;
    clear(): void;
}
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