Karma, PhantomJS and es6 Promises

Question

I am writing a JavaScript library that uses the new es6 promises. I can test the library in Firefox because promises are defined. However, when I try to test my code with Karma

Answer 1

For Babel 6, we need install babel-polyfill to support promise.

npm install --save-dev babel-polyfill

and add a line in karma.conf.js within the files section

files: [
  'node_modules/babel-polyfill/dist/polyfill.js',
  ....
]

It's well documented in https://github.com/babel/karma-babel-preprocessor#polyfill