/** Default TTL when no Cache-Control or credential validity applies (1 hour). */
export declare const DEFAULT_TTL_MS: number;
/**
 * Extract `max-age` (seconds) from response headers and convert to milliseconds.
 */
export declare const parseCacheControlMaxAge: (headers: Headers) => number | undefined;
/**
 * Milliseconds from now until `validUntil` (ISO 8601). Undefined if invalid or already past.
 */
export declare const ttlFromValidUntil: (validUntil: string) => number | undefined;
/**
 * First defined positive TTL among sources, otherwise {@link DEFAULT_TTL_MS}.
 */
export declare const resolveTtl: (...sources: Array<number | undefined>) => number;
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