Minimal file upload React.js component

FileUpload.js

import React, { Component } from 'react';
const S3 = require('aws-sdk/clients/s3');
const AWS = require('aws-sdk');

AWS.config.update({
  accessKeyId: [Your AWS access key ID (from ~/.bashrc)],
  secretAccessKey: [Your AWS secret access key (from ~/.bashrc)]
});

class FileUpload extends Component {
  constructor () {
    super();
    this.state = {
      file: null,
      s3: new AWS.S3({
        params: {Bucket: [Your S3 bucket name]}
      })
    };
  }

  submitFile = (event) => {
    event.preventDefault();

    this.state.s3.upload({
      Key: [folder/filename.ext],
      Body: this.state.file[0],
      ACL: 'public-read'
    }, (err, data) => {
      if (err) {
        console.log(err);
        return alert('There was an error uploading your file: ', err.message);
      }
      alert('Upload file success.');
    });
  }

  handleFileUpload = (event) => {
    this.setState({file: event.target.files});
  }

  render () {
    return (
      <form onSubmit={this.submitFile}>
        <input label='upload file' type='file' onChange={this.handleFileUpload} />
        <button type='submit'>Send</button>
      </form>
    );
  }
}

export default FileUpload;