S3Client.createMultipartUpload(bucketName, objectKey)

import { AWSConfig, S3Client } from 'https://jslib.k6.io/aws/0.11.0/s3.js';

const awsConfig = new AWSConfig({
    region: __ENV.AWS_REGION,
    accessKeyId: __ENV.AWS_ACCESS_KEY_ID,
    secretAccessKey: __ENV.AWS_SECRET_ACCESS_KEY,
    sessionToken: __ENV.AWS_SESSION_TOKEN,
});

const s3 = new S3Client(awsConfig);

const testBucketName = 'test-jslib-aws';
const testFileKey = 'multipart.txt';

export default async function () {
    // Initialize a multipart upload
    const multipartUpload = await s3.createMultipartUpload(testBucketName, testFileKey);

    // Abort multipart upload
    await s3.abortMultipartUpload(testBucketName, testFileKey, multipartUpload.uploadId);
}