Karma coverage does not show any data when using webpack + ES6

Hi

My config

module.exports = function(config) {
  config.set({
    browsers: ["ChromeCanary"],
    coverageReporter: {
      type: "html",
      dir : "./docs/js-coverage"
    },
    files: [{
        pattern: "test.bundle.js",
        watched: false
      }],
    frameworks: ["jasmine"],
    preprocessors: {
        "src/main/webapp/**/*.js": "coverage",
        "test.bundle.js": ["webpack"]
    },
    reporters: ["coverage", "dots"],
    singleRun: false,
    webpack: {
        module: {
            loaders: [{
                  test: /\.js/,
                  exclude: /node_modules/,
                  loader: "babel-loader?cacheDirectory&optional[]=runtime"
                }]
        },
        watch: true
    },
    webpackServer: {
        noInfo: true
    }
  });
};

test.bundle.js

var context = require.context("./src/main/webapp", true, /.+\.test\.js$/);
context.keys().forEach(context);

Tests run fine, HTML report is generated, but it contains no files in the list.

Thanks.

[florin05]

Was not able to get coverage information with webpack (2) and karma-coverage. Had to use both “istanbul-instrumenter-loader” as a webpack file loader for test run and “karma-coverage-istanbul-reporter” as coverage reporter and after couple of days of struggles it worked.

[songguangyu]

coverage sourcemap not work. only index.js.

no filelists, can you help me?