import type { Upstream } from '../../../zero-protocol/src/up.ts';
/**
 * Send message over WebSocket
 *
 * Automatically uses binary (MessagePack) or JSON based on feature flag.
 * Binary encoding provides:
 * - 60-85% size reduction
 * - 44-67% faster encoding/decoding
 * - Better security (not human-readable)
 *
 * @param ws - WebSocket connection
 * @param data - Message to send
 */
export declare function send(ws: WebSocket, data: Upstream): void;
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