I've provided a screen shot for the error.

i am running on windows 10.

Here are some of the package versions from my package.json:
"typescript": "^2.6.2",
"(@)angular/compiler-cli": "^5.1.1",
"(@)angular/core": "^5.0.2",

This only happens when I build for production. ("ng build" works, "ng build --prod" fails)

![spin-kit ng production build issue](https://user-images.githubusercont

Instead of setting a spinner as succeed/fail using the spinners#fail and spinner#succeed methods, it would be great if spinnies could do this automatically when sending a promise as an option:

spinnies.add('spinner-1', { 
  text: 'Doing X..',
  onPromise: {
    promise: someFunction(arg1, arg2), 
    succeed: { 
      text: 'X succeeded',
      color: 'greenBright'
    },
 

probably just adding https://babeljs.io/docs/en/next/babel-plugin-transform-shorthand-properties.html to babel rc and having the babel loader reference that. I can fix or elaborate if needed