webpackJsonp not defined using karma-webpack?

Question

I am building a boilerplate with webpack and karma with mocha.

This is the configuration I am using for karma-webpack. I am new to webpack.

var path          = require('path');
var webpack = require('webpack');
var entries =  {
  "app": ["./index.js"]
};
var root            = './';
var testSrc         = path.join(root, 'tests/');
var jsSrc           = path.join(root, 'src/javascripts/');
var publicPath      = path.join(root , 'public/');
var filenamePattern = 'index.js';
var extensions      = ['js'].map(function(extension) {
  return '.' + extension;
});


var webpackConfig = {
  context: jsSrc,
  resolve: {
    root: jsSrc,
    extensions: [''].concat(extensions)
  },
  resolveLoader: {
    root: path.join(__dirname, "node_modules")
  },
  module: {
    loaders: [{
      test: /\.js$/,
      loader: 'babel-loader',
      exclude: /node_modules/
    }]
  },
  entry: entries,
  output: {
    filename: filenamePattern,
    publicPath: publicPath
  },
  plugins: [new webpack.optimize.CommonsChunkPlugin({
    name: 'shared',
    filename: filenamePattern,
  })]
};

var karmaConfig = {
  frameworks: ['mocha'],
  files: ['tests/test-index.js'],
  preprocessors: {
    'tests/**/*.js': ['webpack']
  },
  webpack: webpackConfig,
  webpackMiddleware: {
    noInfo: true,
  },
  singleRun: false,
  autoWatch: true,
  colors: true,
  reporters: ['nyan'],
  browsers: ['Chrome'],
  plugins: [
    require("karma-nyan-reporter"),
    require("karma-mocha"),
    require("karma-firefox-launcher"),
    require("karma-webpack"),
    require("karma-chrome-launcher")
  ]
};
module.exports = function(config) {
  config.set(karmaConfig);
};

When I run karma start karma.local.conf.js it does not execute the tests becouse it says in the browser webpackJsonp is not defined. I was wondering if I am missing something in this configuration.

Answer 1

You can solve this problem by changing the order of your files loaded into your Karma browser.

karma.conf.js

files: [
            'build/shared.js',
            'build/**/*.js',
        ]

Shared (in my case) is the file where "webpackJsonp" is defined. By putting this one at the top of the files it will be loaded before the other js files. Solving the error.