/**
 * Generate SHA256 hash for cache key
 */
export declare function sha256(input: string): string;
/**
 * Get cache file path for current AUTH_BASE and CLIENT_KEY
 */
export declare function getCacheFile(authBase: string, clientKey: string, cacheDir: string): string;
/**
 * Read cached token if valid
 */
export declare function readCachedToken(cacheFile: string, minTtlSec: number): string | null;
/**
 * Write token to cache
 */
export declare function writeCache(cacheFile: string, sessionJson: {
    accessToken: string;
    expiresIn: number;
}): void;
/**
 * Delete cache file if exists
 */
export declare function deleteCache(cacheFile: string): void;
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