/**
 * Binary Protocol Codec using MessagePack + Gzip Compression
 *
 * Provides highly efficient binary encoding/decoding for WebSocket messages.
 * Performance improvements over JSON:
 * - MessagePack: 60-70% size reduction
 * - MessagePack + Gzip: 85-95% size reduction
 * - 2-3x faster processing
 * - Better security (binary is not human-readable)
 *
 * Example: A 100KB JSON message becomes:
 * - MessagePack only: ~35KB (65% reduction)
 * - MessagePack + Gzip: ~8KB (92% reduction)
 */
import type { Downstream } from './down.ts';
import type { Upstream } from './up.ts';
/**
 * Binary encoding format
 */
export type BinaryFormat = 'msgpack' | 'json';
/**
 * Compression settings
 */
export declare const COMPRESSION_ENABLED = true;
export declare const COMPRESSION_LEVEL = 6;
/**
 * Binary codec for efficient message serialization
 */
export declare const BinaryCodec: {
    /**
     * Encode message to binary format (MessagePack + Gzip Compression)
     *
     * @param data - Message to encode
     * @returns Binary ArrayBuffer (compressed if enabled)
     */
    encode(data: Upstream | Downstream): ArrayBuffer;
    /**
     * Decode binary message (Gzip + MessagePack)
     *
     * @param buffer - Binary data to decode (possibly compressed)
     * @returns Decoded message
     */
    decode(buffer: ArrayBuffer | Uint8Array): Upstream | Downstream;
    /**
     * Check if data is binary format
     *
     * @param data - Data to check
     * @returns True if data is binary (ArrayBuffer or Uint8Array)
     */
    isBinary(data: unknown): data is ArrayBuffer | Uint8Array | Blob;
    /**
     * Get message size in bytes
     *
     * @param data - Message to measure
     * @param format - Encoding format
     * @returns Size in bytes
     */
    getSize(data: Upstream | Downstream, format?: BinaryFormat): number;
    /**
     * Compare JSON vs MessagePack vs Compressed sizes
     *
     * @param data - Message to compare
     * @returns Size comparison with compression stats
     */
    compareSize(data: Upstream | Downstream): {
        json: number;
        msgpack: number;
        compressed: number;
        msgpackReduction: number;
        msgpackReductionPercent: string;
        totalReduction: number;
        totalReductionPercent: string;
    };
};
/**
 * Legacy JSON codec (for backward compatibility)
 */
export declare const JsonCodec: {
    /**
     * Encode message to JSON string
     */
    encode(data: Upstream): string;
    /**
     * Decode JSON string
     */
    decode(data: string): Downstream;
    /**
     * Check if data is JSON string
     */
    isJson(data: unknown): data is string;
};
/**
 * Protocol version constants
 */
export declare const PROTOCOL_SUPPORT: {
    /** Supports binary encoding */
    readonly BINARY: number;
    /** Supports compression */
    readonly COMPRESSION: number;
    /** Supports both */
    readonly BINARY_COMPRESSED: number;
};
/**
 * Check protocol capabilities
 */
export declare function supportsFeature(features: number, feature: number): boolean;
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