/**
 * IPFS client wrapper
 */
export declare class IPFSClient {
    private client;
    private gatewayUrl;
    private localStorage;
    private pinataApiKey?;
    private pinataSecretKey?;
    constructor(gatewayUrl?: string);
    /**
     * Initialize IPFS client
     * @param ipfsUrl IPFS node URL (default: public IPFS gateway) - Only used in Node.js
     * @param pinataApiKey Optional Pinata API key
     * @param pinataSecretKey Optional Pinata secret key
     */
    initialize(ipfsUrl?: string, pinataApiKey?: string, pinataSecretKey?: string): Promise<void>;
    /**
     * Upload data to IPFS
     * @param data Data to upload (string or Buffer)
     * @returns IPFS CID
     */
    upload(data: string | Buffer): Promise<string>;
    /**
     * Upload data using Pinata API (works in browser and Node.js)
     * @param data Data to upload
     * @param pinataApiKey Pinata API key
     * @param pinataSecretKey Pinata secret key
     * @returns IPFS CID
     */
    uploadToPinata(data: string | Buffer, pinataApiKey: string, pinataSecretKey: string): Promise<string>;
    /**
     * Retrieve data from IPFS
     * @param cid IPFS CID
     * @returns Data as string
     */
    retrieve(cid: string): Promise<string>;
    /**
     * Get IPFS gateway URL for a CID
     * @param cid IPFS CID
     * @returns Full gateway URL
     */
    getGatewayUrl(cid: string): string;
}