import { IncomingFile, PresignedUpload, StoredObject } from '../../interfaces/file.interface';
import { ExistsResult, StorageAdapter } from '../../interfaces/storage-adapter.interface';
import { S3StorageConfig } from '../../interfaces/upload-options.interface';
/** AWS S3 adapter — real multipart upload (lib-storage) + presigned PUT/GET. */
export declare class S3Adapter implements StorageAdapter {
    private readonly cfg;
    readonly name = "s3";
    private readonly client;
    private readonly cmd;
    private readonly Upload;
    private readonly presigner;
    private readonly bucket;
    private readonly publicBaseUrl;
    constructor(cfg: S3StorageConfig);
    upload(file: IncomingFile, key: string, meta?: Record<string, string>): Promise<StoredObject>;
    download(key: string): Promise<NodeJS.ReadableStream>;
    delete(key: string): Promise<void>;
    exists(key: string): Promise<ExistsResult>;
    getSignedUploadUrl(key: string, opts: {
        expiresIn: number;
        contentType?: string;
    }): Promise<PresignedUpload>;
    getSignedDownloadUrl(key: string, opts: {
        expiresIn: number;
    }): Promise<string>;
    copy(srcKey: string, destKey: string): Promise<void>;
    publicUrl(key: string): string;
    readRange(key: string, start: number, end: number): Promise<Buffer>;
}