export type CompressionType = 'gzip' | 'br' | 'deflate';
export interface CompressionOptions {
    enabled?: boolean;
    types?: CompressionType[];
    threshold?: number;
}
export declare class CompressionManager {
    private readonly enabled;
    private readonly types;
    private readonly threshold;
    constructor(options?: CompressionOptions);
    getAcceptEncodingHeader(): string | undefined;
    decompress(data: Buffer, encoding?: string): Promise<Buffer>;
    shouldCompress(size: number): boolean;
    getSupportedTypes(): CompressionType[];
    isSupported(type: CompressionType): boolean;
    getInfo(): {
        enabled: boolean;
        types: CompressionType[];
        threshold: number;
    };
    estimateRatio(originalSize: number, compressedSize: number): number;
    getStats(originalSize: number, compressedSize: number): {
        originalSize: number;
        compressedSize: number;
        savedBytes: number;
        savedPercentage: number;
    };
}
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