import { type GetObjectCommand, type HeadBucketCommand, type HeadObjectCommand } from '@aws-sdk/client-s3';
import type { S3FetchResponse, S3ProxyOptions } from './types.js';
type SupportedCommand = GetObjectCommand | HeadObjectCommand | HeadBucketCommand;
/**
 * Owns the AWS S3Client lifecycle and turns SDK responses into the
 * library's public S3FetchResponse shape (or a typed S3ProxyError).
 * The proxy orchestrates request parsing and routing; the gateway
 * is the boundary with the AWS SDK.
 */
export declare class S3Gateway {
    private readonly options;
    private s3?;
    constructor(options: S3ProxyOptions);
    init(): void;
    isInitialized(): void;
    private get client();
    send(command: SupportedCommand, target: string): Promise<S3FetchResponse>;
    private dispatch;
}
export {};
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