export interface CompressionResult {
    compressed: Buffer;
    originalSize: number;
    compressedSize: number;
    ratio: number;
    percentSaved: number;
}
export declare class CompressionEngine {
    compress(text: string, options?: {
        quality?: number;
        mode?: string;
    }): CompressionResult;
    decompress(buffer: Buffer): string;
    compressToBase64(text: string, options?: {
        quality?: number;
        mode?: string;
    }): Omit<CompressionResult, 'compressed'> & {
        compressed: string;
    };
    decompressFromBase64(base64: string): string;
    compressBatch(texts: string[]): (CompressionResult & {
        index: number;
    })[];
    shouldCompress(text: string, minSize?: number): boolean;
    getCompressionStats(text: string, minSize?: number): {
        uncompressed: number;
        compressed: number;
        ratio: number;
        percentSaved: number;
        recommended: boolean;
    };
    /**
     * Default minimum size (in bytes) below which compression isn't
     * worth the metadata overhead. Exposed as a static so callers can
     * override via OptimizationConfig.minOutputSizeBytes and have
     * `recommended` / `shouldCompress` agree on the threshold.
     */
    static DEFAULT_MIN_SIZE_BYTES: number;
}
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