Петр Мухуров

const env = process.env;
const __DEV__ = env.NODE_ENV === "development";

const BASE_CSS_LOADER = {
  loader: "css-loader",
  options: {
    importLoaders: 2,
    sourceMap: true,
    minimize: true
  }
};
const CSS_MODULES_LOADER = {
  loader: "css-loader",
  options: {
    importLoaders: 2,
    localIdentName: "[name]__[local]___[hash:base64:5]",
    modules: true,
    sourceMap: true,
    minimize: true
  }
};
const POSTCSS_LOADER = {
  loader: "postcss-loader",
  options: {
    sourceMap: true,
    plugins: [autoprefixer],
    minimize: true
  }
};
const STYLE_LOADER = __DEV__ ? "style-loader" : MiniCssExtractPlugin.loader;
config.module.rules = [].concat(config.module.rules, [
  {
    test: /\.module\.scss$/,
    use: [
      STYLE_LOADER,
      CSS_MODULES_LOADER,
      POSTCSS_LOADER,
      "sass-loader?sourceMap"
    ]
  },
  {
    test: /\.module\.css$/,
    use: [STYLE_LOADER, CSS_MODULES_LOADER, POSTCSS_LOADER]
  },
  {
    test: /\.scss$/,
    exclude: /\.module\.scss$/,
    use: [
      STYLE_LOADER,
      BASE_CSS_LOADER,
      POSTCSS_LOADER,
      "sass-loader?sourceMap"
    ]
  },
  {
    test: /\.less$/,
    exclude: /\.module\.less$/,
    use: [
      STYLE_LOADER,
      BASE_CSS_LOADER,
      POSTCSS_LOADER,
      "less-loader?sourceMap"
    ]
  },
  {
    test: /\.css$/,
    exclude: /\.module\.css$/,
    use: [STYLE_LOADER, BASE_CSS_LOADER, POSTCSS_LOADER]
  }
]);