webpack.config.babel.js

import webpack from "webpack";
import HtmlWebpackPlugin from "html-webpack-plugin";
import postCSSImport from "postcss-import";
import postCSSNested from "postcss-nested";
import postCSSNext from "postcss-cssnext";
import path from "path";
const ENV = process.env.NODE_ENV || "development";

const CSS_MAPS = ENV !== "production";

module.exports = {
  context: path.resolve(__dirname, "src"),
  entry: {
    "netlify-identity-widget": "./index.js",
  },

  output: {
    path: path.resolve(__dirname, "build"),
    publicPath: "/",
    filename: "[name].js"
  },

  resolve: {
    extensions: [".jsx", ".js", ".json"],
    modules: [
      path.resolve(__dirname, "src/lib"),
      path.resolve(__dirname, "node_modules"),
      "node_modules"
    ],
    alias: {
      components: path.resolve(__dirname, "src/components"), // used for tests
      style: path.resolve(__dirname, "src/style"),
      react: "preact-compat",
      "react-dom": "preact-compat"
    }
  },

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: path.resolve(__dirname, "src"),
        enforce: "pre",
        use: "source-map-loader"
      },
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: "babel-loader"
      },
      {
        // Transform our own .(less|css) files with PostCSS and CSS-modules
        test: /\.(css)$/,
        include: [path.resolve(__dirname, "src/components")],
        use: [
          {
            loader: "css-loader",
            options: { importLoaders: 1 }
          },
          {
            loader: `postcss-loader`,
            options: {
              sourceMap: CSS_MAPS,
              plugins: () => [postCSSImport(), postCSSNested(), postCSSNext()]
            }
          }
        ]
      },
      {
        test: /\.json$/,
        use: "json-loader"
      },
      {
        test: /\.(xml|html|txt|md)$/,
        use: "raw-loader"
      },
      {
        test: /\.(svg|woff2?|ttf|eot|jpe?g|png|gif)(\?.*)?$/i,
        use: ENV === "production" ? "file-loader" : "url-loader"
      }
    ]
  },
  plugins: [
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.DefinePlugin({
      "process.env.NODE_ENV": JSON.stringify(ENV)
    }),
    new HtmlWebpackPlugin({
      template: "./index.ejs",
      inject: false,
      minify: { collapseWhitespace: true }
    })
  ].concat(
    ENV === "production"
      ? [
          new webpack.optimize.UglifyJsPlugin({
            output: {
              comments: false
            },
            compress: {
              unsafe_comps: true,
              properties: true,
              keep_fargs: false,
              pure_getters: true,
              collapse_vars: true,
              unsafe: true,
              warnings: false,
              screw_ie8: true,
              sequences: true,
              dead_code: true,
              drop_debugger: true,
              comparisons: true,
              conditionals: true,
              evaluate: true,
              booleans: true,
              loops: true,
              unused: true,
              hoist_funs: true,
              if_return: true,
              join_vars: true,
              cascade: true,
              drop_console: true
            }
          })
        ]
      : []
  ),

  stats: { colors: true },

  node: {
    global: true,
    process: false,
    Buffer: false,
    __filename: false,
    __dirname: false,
    setImmediate: false
  },

  devtool: ENV === "production" ? "source-map" : "cheap-module-eval-source-map",

  devServer: {
    port: process.env.PORT || 8080,
    host: "localhost",
    publicPath: "/",
    contentBase: "./src",
    historyApiFallback: true,
    open: true,
    openPage: "",
    proxy: {
      // OPTIONAL: proxy configuration:
      // '/optional-prefix/**': { // path pattern to rewrite
      //   target: 'http://target-host.com',
      //   pathRewrite: path => path.replace(/^\/[^\/]+\//, '')   // strip first path segment
      // }
    }
  }
};