/**
 * Amazon S3 storage provider
 */
import { BaseStorageProvider } from './base.js';
import type { CcanywhereConfig } from '../../types/index.js';
export declare class S3StorageProvider extends BaseStorageProvider {
    private readonly client;
    private readonly bucket;
    constructor(config: NonNullable<CcanywhereConfig['storage']>['s3']);
    upload(key: string, content: Buffer | string, contentType?: string): Promise<string>;
    exists(key: string): Promise<boolean>;
    delete(key: string): Promise<void>;
    getUrl(key: string): Promise<string>;
}
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