import { S3Client } from '@aws-sdk/client-s3';
import { PassThrough, Readable } from 'stream';
interface FileOperationArgs {
    client: S3Client;
    bucket: string;
    key: string;
}
export interface UploadResult {
    Location: string;
    ETag?: string;
    Bucket?: string;
    Key?: string;
    key?: string;
}
export declare const fileExists: ({ client, bucket, key }: FileOperationArgs) => Promise<boolean>;
export declare const download: ({ client, writeStream, bucket, key, }: FileOperationArgs & {
    writeStream: NodeJS.WritableStream;
}) => Promise<void>;
export declare const upload: ({ client, readStream, bucket, key, contentType, }: FileOperationArgs & {
    readStream: Readable;
    contentType: string;
}) => Promise<UploadResult>;
export declare const uploadThrough: ({ key, contentType, bucket, client, }: FileOperationArgs & {
    contentType: string;
}) => PassThrough;
export {};