Can't include my source files to the coverage using karma, webpack and babel -

i'm trying setup project webpack, babel , karma, i'm having problem configure test coverage of source files.

i'm using webpack bundle , transpile javascript files using babel-loader , karma karma-webpack run tests.

the problem can't include source files coverage, ones import on test files. i'm using babel-plugin-istanbul instrument es2015 code.

here webpack configuration file:

const { resolve } = require('path');  module.exports = {   context: __dirname,   entry: './main.js',   output: {     filename: 'bundle.js',     path: resolve(__dirname, 'dist'),   },   resolve: {     root: __dirname,     extensions: ['', '.js', '.jsx'],     alias: {       components: resolve(__dirname, 'src/components'),     },   },   devtool: 'eval-source-map',   module: {     loaders: [       {         test: /\.jsx?$/,         loader: 'babel',         exclude: /node_modules/,       },     ],   }, }; 

and karma configuration file:

const webpackconfig = require('./webpack.config');  process.env.babel_env = 'test';  module.exports = function karmaconfig(config) {   config.set({     basepath: './',     frameworks: ['mocha', 'chai', 'sinon'],     files: ['specs/**/*.spec.js'],     plugins: [       'karma-webpack',       'karma-mocha',       'karma-chai',       'karma-sinon',       'karma-spec-reporter',       'karma-coverage',       'karma-spec-reporter',       'karma-phantomjs-launcher',     ],     preprocessors: {       'specs/**/*.spec.js': ['webpack'],       'src/**/*.+(js|jsx)': ['webpack'],     },     reporters: ['spec', 'coverage'],     coveragereporter: {       dir: 'coverage',       reporters: [         { type: 'lcov', subdir: 'reporter-lcov' },         { type: 'text-summary' },       ],     },     webpack: webpackconfig,     webpackmiddleware: {       noinfo: true,     },     port: 9876,     colors: true,     loglevel: config.log_info,     autowatch: true,     browsers: ['phantomjs'],     singlerun: false,     concurrency: infinity,   }); }; 

and here's .babelrc file, configure babel-plugin-istanbul:

{   "presets": ["es2015", "react"],   "env": {     "test": {       "plugins": [         ["istanbul", { "exclude": ["**/*.spec.js"] }]       ]     }   } } 

am missing something?

thanks in advance!