Tracing Errors Using Karma + Babel + Webpack With Bundles

Using karma + babel + webpack to run ES6 unit tests. I use a webpack bundle to locate and transpile the ES6. It all works, but whenever there is an error in any test file I get mes

Solution 1:

Set devtool to eval in webpack. It works for me. Will give you correct file name with line no. Read more here http://webpack.github.io/docs/configuration.html#devtool

webpack: {
    devtool: 'eval',
    module: {
        loaders: [{
              test: /\.js/,
              exclude: /node_modules/,
              loader: "babel-loader?cacheDirectory&optional[]=runtime"
            }]
    },
    watch: true
},