/**
 * Shared cryptographic utilities.
 *
 * @module
 */
/**
 * Generate a cryptographically random base64url string.
 *
 * @param byte_length - number of random bytes (default 32 = 256 bits)
 * @returns base64url-encoded string without padding
 */
export declare const generate_random_base64url: (byte_length?: number) => string;
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