How to use the @aws-sdk/client-s3.S3Client function in @aws-sdk/client-s3

(async function() {
  // Load the S3 client and commands for Node.js
  const {
    S3Client,
    CreateBucketCommand,
    PutObjectCommand
  } = require('@aws-sdk/client-s3')
  
  var uuid = require('uuid')

  // Unique bucket name
  const bucketName = 'node-sdk-sample-' + uuid.v4()
  // Name for uploaded object
  const keyName = 'hello_world.txt'

  const client = new S3Client({})

  const createCommand = new CreateBucketCommand({
    Bucket: bucketName
  })

  const putCommand = new PutObjectCommand({
    Bucket: bucketName,
    Key: keyName,
    Body: 'Hello World!'
  })

  try {
    await client.send(createCommand)
    await client.send(putCommand)
    console.log('Successfully uploaded data to ' + bucketName + '/' + keyName)
  } catch (err) {