evaporate-upload.js

import Evaporate from 'evaporate';
import sparkMD5 from 'spark-md5';
import sha256 from 'js-sha256';

const uploader = Evaporate.create({
  signerUrl: '/uploads/auth',
  aws_key: 'AWS_PUBLIC_KEY',
  bucket: 'your-bucket-name',
  cloudfront: true,
  computeContentMd5: true,
  cryptoMd5Method: (d) => btoa(sparkMD5.ArrayBuffer.hash(d, true)),
  cryptoHexEncodedHash256: sha256,
});