import type { MultiPartFile } from "../lara/client";
export type S3UploadFields = {
    acl: string;
    bucket: string;
    key: string;
};
/** @internal */
export declare abstract class S3Client {
    upload(url: string, fields: S3UploadFields, file: MultiPartFile, length?: number): Promise<void>;
    protected abstract _upload(url: string, fields: S3UploadFields, file: any, length?: number): Promise<void>;
    protected abstract download(url: string): Promise<Blob | Buffer>;
    protected abstract downloadStream(url: string): Promise<unknown>;
    protected abstract wrapMultiPartFile(file: MultiPartFile): any;
}