/**
 * Parse an RFC 5646 Accept-Language header value into a prioritized list of language tags.
 *
 * @example
 * parseAcceptLanguage("tr-TR,tr;q=0.9,en-US;q=0.8,en;q=0.7")
 * // → ["tr-TR", "tr", "en-US", "en"]
 */
export declare function parseAcceptLanguage(header: string | null | undefined): string[];
/**
 * Type-safe message accessor for CDN translation messages.
 * Safely extracts a string value from a namespace, with fallback.
 *
 * @example
 * const common = messages.common;
 * msg(common, "welcome", "Welcome") // → "Hoş geldiniz" or "Welcome"
 */
export declare function msg(ns: Record<string, unknown> | undefined, key: string, fallback?: string): string;
/**
 * Find the best matching locale from a parsed Accept-Language list against available locales.
 *
 * Matching strategy (in order):
 * 1. Exact match: "tr-TR" → "tr-TR"
 * 2. Base language match: "tr-TR" → "tr"
 * 3. Region expansion: "tr" matches "tr-TR" (first available variant)
 *
 * Returns null if no match found.
 */
export declare function matchLocale(languages: string[], availableLocales: string[]): string | null;
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