import { Storage } from '@google-cloud/storage';
/**
 * Validates library configuration
 */
export declare function validateGCSConfig(bucketName: string, storage: Storage | undefined, directoryPaths: string[]): void;
/**
 * Validates bucket exists and is accessible
 */
export declare function validateBucketAccess(storage: Storage, bucketName: string): Promise<void>;
/**
 * Validate file name doesn't contain invalid characters
 */
export declare function validateFileName(filename: string): void;