webpack.common.config.js

const ExtractTextPlugin = require("extract-text-webpack-plugin");
const extractSass = new ExtractTextPlugin({
  filename: "[name].[contenthash].css",
  disable: process.env.NODE_ENV === "development"
});
module.exports = {
  entry: "./src/index.js",
  output: {
    filename: "bundle.js",
    path: __dirname + "/dist",
    publicPath: "/dist/"
  },

  // devtool: "source-map",

  resolve: {
    extensions: [".ts", ".tsx", ".js", ".json"]
  },

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        loaders: ["babel-loader"]
      },
      { enforce: "pre", test: /\.js$/, loader: "source-map-loader" }
    ]
  },

  plugins: []
};