import { Readable } from 'stream';
export interface UploadOptions {
    key: string;
    metadata?: Record<string, string>;
    contentType?: string;
}
export interface DownloadOptions {
    key: string;
}
export interface ListOptions {
    prefix?: string;
    maxKeys?: number;
    startAfter?: string;
}
export interface StorageObject {
    key: string;
    size: number;
    lastModified: Date;
    metadata?: Record<string, string>;
}
export interface DeleteOptions {
    key: string;
}
export interface PresignedUrlOptions {
    key: string;
    expiresIn?: number;
}
export interface IStorageAdapter {
    uploadStream(stream: Readable, options: UploadOptions): Promise<{
        key: string;
        etag?: string;
    }>;
    downloadStream(options: DownloadOptions): Promise<Readable>;
    listObjects(options?: ListOptions): Promise<StorageObject[]>;
    deleteObject(options: DeleteOptions): Promise<void>;
    generatePresignedUrl(options: PresignedUrlOptions): Promise<string>;
    objectExists(key: string): Promise<boolean>;
}