old_contents: module.exports = function(karma) {
    karma.set({
      plugins: [
        'karma-browserify',
        'karma-jasmine',
        'karma-phantomjs-launcher'
      ],
  
      frameworks: ['browserify', 'jasmine'],
  
      reporters: ['progress'],
  
      files: [
        'src/**/*.js',
        'test/**/*.js',
        './node_modules/phantomjs-polyfill/bind-polyfill.js'
      ],
  
      preprocessors: {
        'src/**/*.js' : ['browserify'],
        'test/**/*.test.js': ['browserify']
      },
  
      browserify: {
        debug: true,
        transform: ['babelify']
      },
  
      browsers: ['PhantomJS']
    });
  };
  
new_contents: module.exports = function(karma) {
    karma.set({
      plugins: [
        'karma-browserify',
        'karma-jasmine',
        'karma-phantomjs-launcher'
      ],
  
      frameworks: ['browserify', 'jasmine'],
  
      reporters: ['progress'],
  
      files: [
        'src/**/*.js',
        'test/**/*.js',
        './node_modules/phantomjs-polyfill/bind-polyfill.js'
      ],
  
      preprocessors: {
        'src/**/*.js' : ['browserify'],
        'test/**/*.test.js': ['browserify']
      },
  
      browserify: {
        debug: true,
        transform: [
          ['babelify', { presets: ['es2015'] }]
        ]
      },
  
      browsers: ['PhantomJS']
    });
  };
  
subject: Update karma config