export type CacheAge = `${number}${'ms' | 's' | 'm' | 'h' | 'd'}` | number;
export declare const cacheAge: {
    toMilliseconds: (ca: CacheAge) => number;
    toSeconds: (ca: CacheAge) => number;
};
export declare const isCacheAge: (ca?: unknown) => ca is CacheAge;