/** Maximum concrete key or glob length accepted by the cache API. */
export declare const API_CACHE_KEY_MAX_LENGTH = 512;
/** Namespace reserved for deterministic API-boundary key rewrites. */
export declare const SANITIZED_CACHE_KEY_MARKER = "vf-sanitized:";
export declare const CACHE_KEY_ALLOWED_PATTERN: RegExp;
export declare const CACHE_PATTERN_ALLOWED_PATTERN: RegExp;
/** Whether a concrete key can cross the API cache boundary unchanged. */
export declare function isValidCacheKey(key: string): boolean;
/** Whether a concrete key can cross the API boundary without being rewritten. */
export declare function isCacheKeyPassThroughSafe(key: string): boolean;
/** Whether a deletion glob can cross the API cache boundary unchanged. */
export declare function isValidCachePattern(pattern: string): boolean;
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