TypeError: _crypto2.default.createHash is not a function

[dm-grinko]

I am trying to use it on my Angular app.

import * as aws4 from 'hyper-aws4';

test() {
    const creds = this.awsService.getFederateIdentityCredentials();
    const signOption = {
        url: 'http://google.com',
        credential: {
          accessKey: creds.accessKeyId,
          secretKey: creds.secretAccessKey
        }
      }
    const headers = aws4.sign(signOption);
    console.log(headers);
}

but I get this error:

TypeError: _crypto2.default.createHash is not a function