/// <reference types="node" />
import { PassThrough, Readable } from 'stream';
import { AbortMultipartUploadCommandOutput, CompleteMultipartUploadCommandOutput, PutObjectCommandInput } from '@aws-sdk/client-s3';
export interface ObjectInput {
    /**
     * The S3 bucket to read from.
     */
    readonly bucket: string;
    /**
     * The S3 object to read from.
     */
    readonly key: string;
    /**
     * The content type of the object.
     */
    readonly contentType?: string;
}
export declare class S3Stream {
    /**
     * The S3 client to use.
     */
    private s3;
    /**
     * A helper class to read and write to S3 using
     * streams.
     * @param {*} region the AWS region to use.
     */
    constructor(opts?: {
        region: string | undefined;
    });
    /**
     * @param input represents a bucket, key, and content type tuple.
     * @returns a read stream to the given S3 object.
     */
    createS3ReadStream(input: ObjectInput): Promise<Readable>;
    /**
     * Creates a write stream to the given S3 object.
     * @param input represents a bucket, key, and content type tuple.
     * @returns an object containing the write stream and a promise
     * which resolves when the write stream has finished.
     */
    createS3WriteStream(input: ObjectInput, opts?: Partial<PutObjectCommandInput>): {
        writeStream: PassThrough;
        promise: Promise<AbortMultipartUploadCommandOutput | CompleteMultipartUploadCommandOutput>;
    };
}