/**
 * Encrypts and compresses a string using AES-256-GCM and zlib deflate
 * @param text - The text to encrypt
 * @param key - The encryption key
 * @returns The encrypted and compressed text as a string in format: iv:authTag:encryptedData (all base64 encoded)
 */
export declare function encryptAndCompress(text: string, key: string): string;
/**
 * Decrypts and decompresses a string that was encrypted using the encryptAndCompress function
 * @param encryptedText - The encrypted text (format: iv:authTag:encryptedData)
 * @param key - The encryption key (must be the same as used for encryption)
 * @returns The decrypted and decompressed text
 */
export declare function decryptAndDecompress(encryptedText: string, key: string): string;
/**
 * Measures the compression ratio achieved by the encryptAndCompress function
 * @param originalText - The original text
 * @param encryptedText - The encrypted and compressed text
 * @returns The compression ratio (original size / encrypted size)
 */
export declare function getCompressionStats(originalText: string, encryptedText: string): {
    originalSize: number;
    encryptedSize: number;
    compressionRatio: number;
};
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