/**
 * @fractary/core - R2 Storage Implementation
 *
 * Cloudflare R2 storage backend for file operations.
 * R2 is S3-compatible, so this uses the AWS SDK with R2 endpoint.
 */
import { Storage, R2StorageConfig } from './types';
/**
 * Cloudflare R2 storage implementation
 *
 * Uses S3Storage internally with R2-specific endpoint configuration.
 */
export declare class R2Storage implements Storage {
    private s3Storage;
    private config;
    constructor(config: R2StorageConfig);
    /**
     * Write content to R2
     */
    write(id: string, content: string | Buffer): Promise<string>;
    /**
     * Read content from R2
     */
    read(id: string): Promise<string | null>;
    /**
     * Check if object exists in R2
     */
    exists(id: string): Promise<boolean>;
    /**
     * List objects in R2 with optional prefix
     */
    list(prefix?: string): Promise<string[]>;
    /**
     * Delete object from R2
     */
    delete(id: string): Promise<void>;
    /**
     * Get a URL for the object
     *
     * R2 supports presigned URLs, and can also use public bucket URLs.
     */
    getUrl(id: string, expiresIn?: number): Promise<string | null>;
    /**
     * Get the bucket name
     */
    getBucket(): string;
    /**
     * Get the account ID
     */
    getAccountId(): string;
    /**
     * Get the configured prefix
     */
    getPrefix(): string | undefined;
}
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