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

You can use karma-babel-preprocessor for files that uses ES6 features. Install it with

npm install --save-dev karma-babel-preprocessor

and then add specify what files should be preprocessed you karma.conf:

preprocessors: {
      "src/**/*.js": ["babel"],
      "test/**/*.js": ["babel"]
    },