/**
 * Cloudflare R2 implementation of StorageProvider.
 *
 * R2 is S3-compatible. This is a native client: AWS SigV4 request signing
 * (./_sigv4.ts, verified against AWS's official test vector) over global
 * `fetch`, plus a small XML reader for ListObjectsV2 (./_xml.ts). No SDK
 * dependency — only node:crypto + fetch.
 *
 * Path-style addressing is used for the S3 API calls
 * (https://<account>.r2.cloudflarestorage.com/<bucket>/<key>); this has no
 * effect on the public object URLs, which are built from `publicBaseUrl`.
 *
 * GAP-208 Phase 2a (2026-05-18). Phase 1 (interface + types) shipped in #959.
 * Native client (dropping @aws-sdk/client-s3) landed 2026-06-09.
 *
 * Server-only. Do NOT import from client-side code or edge runtime.
 *
 * Known limitation (unchanged from the SDK version): request bodies are
 * buffered fully in memory (see toUint8Array) so the payload can be hashed for
 * SigV4. Streaming uploads (STREAMING-AWS4-HMAC-SHA256-PAYLOAD) are a future
 * enhancement; presigned/private URLs remain Phase 2b.
 */
import type { R2Config, StorageProvider } from './types.js';
export declare function createR2Provider(config: R2Config): StorageProvider;
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