/**
 * Header utility functions
 * Provides utilities for header analysis, validation, and manipulation
 */
import type { ApiHeaders } from '@plyaz/types/api';
/**
 * Get headers that affect caching
 */
export declare function getCacheAffectingHeaders(headers: ApiHeaders): ApiHeaders;
/**
 * Get headers that don't affect caching
 */
export declare function getNonCacheAffectingHeaders(headers: ApiHeaders): ApiHeaders;
/**
 * Sanitize headers by redacting sensitive information
 * The test expects that sensitive headers are kept but with value '[REDACTED]'
 */
export declare function sanitizeHeaders(headers: ApiHeaders): ApiHeaders;
/**
 * Remove sensitive headers
 */
export declare function removeSensitiveHeaders(headers: ApiHeaders): ApiHeaders;
/**
 * Normalize headers to lowercase keys
 * Also filters out null and undefined values
 */
export declare function normalizeHeaders(headers: ApiHeaders): ApiHeaders;
/**
 * Check if headers contain authentication
 */
export declare function hasAuthentication(headers: ApiHeaders): boolean;
export declare function getAuthenticationType(headers: ApiHeaders): string | null;
export declare function validateHeaders(headers: ApiHeaders): string[];
/**
 * Generate a fingerprint for headers (useful for caching)
 */
export declare function getHeaderFingerprint(headers: ApiHeaders): string;
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