/**
 * HTTP encoding utilities for Accept-Encoding parsing and compression algorithm selection
 */
/**
 * Supported compression algorithms
 */
export type TCompressionAlgorithm = 'br' | 'gzip' | 'deflate' | 'identity';
/**
 * Parsed encoding preference with quality value
 */
export interface IEncodingPreference {
    encoding: string;
    q: number;
}
/**
 * Parse Accept-Encoding header with quality values
 *
 * @example
 * parseAcceptEncoding('gzip, deflate, br;q=1.0, identity;q=0.5')
 * // Returns: [{ encoding: 'br', q: 1.0 }, { encoding: 'gzip', q: 1.0 }, { encoding: 'deflate', q: 1.0 }, { encoding: 'identity', q: 0.5 }]
 */
export declare function parseAcceptEncoding(header: string | null): IEncodingPreference[];
/**
 * Select best encoding from client preferences and server support
 */
export declare function selectEncoding(acceptEncoding: string | null, supported: TCompressionAlgorithm[]): TCompressionAlgorithm;
/**
 * Check if content type should be compressed
 */
export declare function isCompressible(contentType: string | null, customTypes?: string[]): boolean;
/**
 * Get default compressible types (for configuration reference)
 */
export declare function getDefaultCompressibleTypes(): string[];