/**
 * Compression utilities using CompressionStream API
 */
/**
 * Check if compression is supported
 */
export declare function isCompressionSupported(): boolean;
/**
 * Compress a string using gzip
 */
export declare function compress(data: string): Promise<Uint8Array>;
/**
 * Decompress gzip data to string
 */
export declare function decompress(data: Uint8Array): Promise<string>;
/**
 * Check if data should be compressed based on size
 */
export declare function shouldCompress(data: string, threshold?: number): boolean;
/**
 * Get compression ratio
 */
export declare function getCompressionRatio(original: number, compressed: number): number;