/**
 * @file arweave.ts
 * @description Arweave/Irys integration for permanent decentralized storage.
 */
import type { UploadResult } from "./types";
/**
 * Arweave storage client using Irys for uploads.
 *
 * @example
 * ```ts
 * const arweave = new ArweaveClient("https://node2.irys.xyz", privateKey);
 * await arweave.connect();
 *
 * const result = await arweave.uploadFile(
 *   Buffer.from(JSON.stringify({ memory: "hello" })),
 *   "application/json"
 * );
 *
 * const data = await arweave.downloadData(result.hash);
 * ```
 */
export declare class ArweaveClient {
    private irysUrl;
    private gateway;
    private privateKey;
    private irys;
    constructor(irysUrl: string, privateKey: string, gateway?: string);
    /** Initialize the Irys client connection. */
    connect(): Promise<void>;
    /**
     * Factory for creating the Irys client. Overridable in tests via vi.spyOn.
     * @internal
     */
    _createIrys(url: string, privateKey: string): Promise<unknown>;
    /** Upload data to Arweave via Irys. */
    uploadData(data: Buffer | Uint8Array, contentType: string, tags?: Record<string, string>): Promise<UploadResult>;
    /** Upload data to Arweave via Irys. */
    uploadFile(data: Buffer | Uint8Array, contentType: string, tags?: Record<string, string>): Promise<UploadResult>;
    /** Download data from Arweave by transaction hash. */
    downloadData(hash: string): Promise<Buffer>;
    /** Retrieve data from Arweave by transaction hash. */
    getFile(hash: string): Promise<Buffer>;
    /** Get the price to upload a given number of bytes (in wei). */
    getUploadPrice(bytes: number): Promise<bigint>;
    /** Upload data encrypted with Lit Protocol access conditions. */
    uploadEncrypted(data: Buffer | Uint8Array, contentType: string, tags?: Record<string, string>): Promise<UploadResult>;
    /** Get the Arweave gateway URL for a given hash. */
    getUrl(hash: string): string;
}
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