message: simplify webpack config
diff: // SURGEON GENERAL'S WARNING: THIS IS NOT A WEBPACK CONFIG, THIS IS A FUNCTION
  // THAT ENHANCES THE BASE REACT-STATIC WEBPACK CONFIG.
  -const ExtractTextPlugin = require("extract-text-webpack-plugin");
  -
  -const staticWebpackConfig = (config, { defaultLoaders, stage }) => {
  - let loaders = [];
  -
  - if (stage === "dev") {
  - loaders = [
  - { loader: "style-loader" },
  - { loader: "css-loader" },
  - { loader: "sass-loader" }
  - ];
  - } else {
  - loaders = [
  - {
  - loader: "css-loader",
  - options: {
  - importLoaders: 1,
  - minimize: stage === "prod",
  - sourceMap: false
  - }
  - },
  - {
  - loader: "sass-loader",
  - options: { includePaths: ["src/"] }
  - }
  - ];
  -
  - // Don't extract css to file during node build process
  - if (stage !== "node") {
  - loaders = ExtractTextPlugin.extract({
  - fallback: {
  - loader: "style-loader",
  - options: {
  - sourceMap: false,
  - hmr: false
  - }
  - },
  - use: loaders
  - });
  - }
  - }
  -
  +const staticWebpackConfig = (config, { defaultLoaders }) => {
  + config.devtool = false;
  config.module.rules = [
  {
  oneOf: [
  - {
  - test: /\.s?(a|c)ss$/,
  - use: loaders
  - },
  {
  test: /\.svg$/,
  use: [
  