/**
 * Defines interface for storage provider implementations.
 *
 * @remarks
 * Abstracts storage backends (IPFS, Google Drive, Pinata) behind
 * common interface for encrypted file operations.
 *
 * @category Storage
 * @example
 * ```typescript
 * class MyStorage implements StorageProvider {
 *   async upload(file: Blob): Promise<StorageUploadResult> {
 *     const url = await uploadToService(file);
 *     return { url, size: file.size, contentType: file.type };
 *   }
 *
 *   async download(url: string): Promise<Blob> {
 *     return fetch(url).then(r => r.blob());
 *   }
 * }
 * ```
 */
export interface StorageProvider {
    /**
     * Upload a file to the storage provider
     *
     * @param file - The file to upload
     * @param filename - Optional custom filename
     * @returns Promise with storage URL and metadata
     */
    upload(file: Blob, filename?: string): Promise<StorageUploadResult>;
    /**
     * Download a file from the storage provider
     *
     * @param url - The storage URL
     * @returns Promise with file blob
     */
    download(url: string): Promise<Blob>;
    /**
     * List files from the storage provider
     *
     * @param options - Optional filtering and pagination
     * @returns Promise with file list
     */
    list(options?: StorageListOptions): Promise<StorageFile[]>;
    /**
     * Delete a file from the storage provider
     *
     * @param url - The storage URL
     * @returns Promise with success status
     */
    delete(url: string): Promise<boolean>;
    /**
     * Get provider-specific configuration
     *
     * @returns Provider configuration object
     */
    getConfig(): StorageProviderConfig;
}
export interface StorageUploadResult {
    /** Public URL to access the file */
    url: string;
    /** File size in bytes */
    size: number;
    /** Content type/MIME type */
    contentType: string;
    /** Provider-specific metadata */
    metadata?: Record<string, unknown>;
}
export interface StorageFile {
    /** File identifier */
    id: string;
    /** File name */
    name: string;
    /** Public URL to access the file */
    url: string;
    /** File size in bytes */
    size: number;
    /** Content type/MIME type */
    contentType: string;
    /** Upload timestamp */
    createdAt: Date;
    /** Provider-specific metadata */
    metadata?: Record<string, unknown>;
}
export interface StorageListOptions {
    /** Maximum number of files to return */
    limit?: number;
    /** Pagination cursor/offset */
    offset?: string | number;
    /** Filter by file name pattern */
    namePattern?: string;
    /** Filter by content type */
    contentType?: string;
}
export interface StorageProviderConfig {
    /** Provider name */
    name: string;
    /** Provider type */
    type: string;
    /** Whether authentication is required */
    requiresAuth: boolean;
    /** Supported features */
    features: {
        upload: boolean;
        download: boolean;
        list: boolean;
        delete: boolean;
    };
}
export declare class StorageError extends Error {
    readonly code: string;
    readonly provider: string;
    constructor(message: string, code: string, provider: string, options?: {
        cause?: Error;
    });
}