text: 'use strict';
  
  const autoprefixer = require('autoprefixer');
  const path = require('path');
  const webpack = require('webpack');
  const HtmlWebpackPlugin = require('html-webpack-plugin');
  const ExtractTextPlugin = require('extract-text-webpack-plugin');
  const ManifestPlugin = require('webpack-manifest-plugin');
  const TerserPlugin = require("terser-webpack-plugin");
  const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
  const paths = require('./paths');
  const getClientEnvironment = require('./env');
  
  // Webpack uses `publicPath` to determine where the app is being served from.
  // It requires a trailing slash, or the file assets will get an incorrect path.
  // We set the path base to empty string to fix asset URLs on gh-pages
  const publicPath = '';
  // Some apps do not use client-side routing with pushState.
  // For these, "homepage" can be set to "." to enable relative asset paths.
  const shouldUseRelativeAssetPaths = publicPath === './';
  // `publicUrl` is just like `publicPath`, but we will provide it to our app
  // as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
  // Omit trailing slash as %PUBLIC_URL%/xyz looks better than %PUBLIC_URL%xyz.
  const publicUrl = publicPath.slice(0, -1);
  // Get environment variables to inject into our app.
  const env = getClientEnvironment(publicUrl);
  
  // Assert this just to be safe.
  // Development builds of React are slow and not intended for production.
  if (env.stringified['process.env'].NODE_ENV !== '"production"') {
    throw new Error('Production builds must have NODE_ENV=production.');
  }
  
  // Note: defined here because it will be used more than once.
  const cssFilename = 'static/css/[name].[contenthash:8].css';
  
  // ExtractTextPlugin expects the build output to be flat.
  // (See https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/27)
  // However, our output is structured with css, js and media folders.
  // To have this structure working with relative paths, we have to use custom options.
  const extractTextPluginOptions = shouldUseRelativeAssetPaths
    ? // Making sure that the publicPath goes back to to build folder.
      { publicPath: Array(cssFilename.split('/').length).join('../') }
    : {};
  
  // This is the production configuration.
  // It compiles slowly and is focused on producing a fast and minimal bundle.
  // The development configuration is different and lives in a separate file.
  module.exports = {
    // Don't attempt to continue if there are any errors.
    bail: true,
    // We generate sourcemaps in production. This is slow but gives good results.
    // You can exclude the *.map files from the build during deployment.
    devtool: 'source-map',
    // In production, we only want to load the polyfills and the app code.
    entry: [require.resolve('./polyfills'), paths.appIndexJs],
    output: {
      // The build folder.
      path: paths.appBuild,
      // Generated JS file names (with nested folders).
      // There will be one main bundle, and one file per asynchronous chunk.
      // We don't currently advertise code splitting but Webpack supports it.
      filename: 'static/js/[name].[chunkhash:8].js',
      chunkFilename: 'static/js/[name].[chunkhash:8].chunk.js',
      sourceMapFilename: '[file].map',
      // We inferred the "public path" (such as / or /my-project) from homepage.
      publicPath: '',
      // Point sourcemap entries to original disk location
      devtoolModuleFilenameTemplate: info =>
        path.relative(paths.appSrc, info.absoluteResourcePath),
    },
    resolve: {
      // This allows you to set a fallback for where Webpack should look for modules.
      // We read `NODE_PATH` environment variable in `paths.js` and pass paths here.
      // We placed these paths second because we want `node_modules` to "win"
      // if there are any conflicts. This matches Node resolution mechanism.
      // https://github.com/facebookincubator/create-react-app/issues/253
      modules: ['node_modules', paths.appNodeModules].concat(paths.nodePaths),
      // These are the reasonable defaults supported by the Node ecosystem.
      // We also include JSX as a common component filename extension to support
      // some tools, although we do not recommend using it, see:
      // https://github.com/facebookincubator/create-react-app/issues/290
      extensions: [".webpack.js", ".web.js", ".ts", ".tsx", ".js", ".json"],
      alias: {
  
        // Support React Native Web
        // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
        'react-native': 'react-native-web',
      },
    },
    module: {
      strictExportPresence: true,
      rules: [
        // TODO: Disable require.ensure as it's not a standard language feature.
        // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
        // { parser: { requireEnsure: false } },
  
        { test: /\.tsx?$/, use: "ts-loader" },
  
        { test: /\.js$/, use: "source-map-loader", enforce: "pre" },
  
  
        // "url" loader works just like "file" loader but it also embeds
        // assets smaller than specified size as data URLs to avoid requests.
        {
          test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
          loader: require.resolve('url-loader'),
          options: {
            limit: 10000,
            name: 'static/media/[name].[hash:8].[ext]',
          },
        },
        // The notation here is somewhat confusing.
        // "postcss" loader applies autoprefixer to our CSS.
        // "css" loader resolves paths in CSS and adds assets as dependencies.
        // "style" loader normally turns CSS into JS modules injecting <style>,
        // but unlike in development configuration, we do something different.
        // `ExtractTextPlugin` first applies the "postcss" and "css" loaders
        // (second argument), then grabs the result CSS and puts it into a
        // separate file in our build process. This way we actually ship
        // a single CSS file in production instead of JS code injecting <style>
        // tags. If you use code splitting, however, any async bundles will still
        // use the "style" loader inside the async code so CSS from them won't be
        // in the main CSS file.
        {
          test: /\.scss$/,
          use: ExtractTextPlugin.extract({
            fallback: "style-loader",
            use: [{
              loader: "css-loader",
              options: {
                sourceMap: true,
                importLoaders: 2,
                // TODO: use hash in production
                // localIdentName: "[name]__[local]___[hash:base64:5]"
                // Don't use hash in-development, enabling us to edit html directly easily
                modules: {
                  localIdentName: "[name]__[local]___[hash:base64:5]"
                }
              }
            }, {
              loader: "postcss-loader",
              options: {
                plugins: function () {
                  return [
                      require("autoprefixer")
                  ];
                }
              }
            }, {
              loader: "sass-loader",
               options: {
                 sourceMap: true,
                 includePaths: [
                   path.resolve(__dirname, "../node_modules/normalize-scss/sass")
                 ]
               }
            }]
          })
        },
  
        {
          test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/,
          use:  {
            loader: 'url-loader',
            options: {
              limit: 100000,
              mimetype: "application/font-woff"
            }
          }
  
        },
        {
          test: /\.(ttf|eot|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
          use: "url-loader"
        }
        // ** STOP ** Are you adding a new loader?
        // Remember to add the new extension(s) to the "url" loader exclusion list.
      ],
    },
    plugins: [
      // Generates an `index.html` file with the <script> injected.
      new HtmlWebpackPlugin({
        inject: true,
        template: path.resolve(__dirname, "../index.ejs"),
        minify: {
          removeComments: true,
          collapseWhitespace: true,
          removeRedundantAttributes: true,
          useShortDoctype: true,
          removeEmptyAttributes: true,
          removeStyleLinkTypeAttributes: true,
          keepClosingSlash: true,
          minifyJS: true,
          minifyCSS: true,
          minifyURLs: true,
        },
      }),
      // Makes some environment variables available in index.html.
      // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
      // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
      // In production, it will be an empty string unless you specify "homepage"
      // in `package.json`, in which case it will be the pathname of that URL.
      new InterpolateHtmlPlugin(HtmlWebpackPlugin, env.raw),
      // Makes some environment variables available to the JS code, for example:
      // if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
      // It is absolutely essential that NODE_ENV was set to production here.
      // Otherwise React will be compiled in the very slow development mode.
      new webpack.DefinePlugin(env.stringified),
      // Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
      new ExtractTextPlugin({
        filename: cssFilename,
      }),
      // Generate a manifest file which contains a mapping of all asset filenames
      // to their corresponding output file so that tools can pick it up without
      // having to parse `index.html`.
      new ManifestPlugin({
        fileName: 'asset-manifest.json',
      }),
    ],
    // Some libraries import Node modules but don't use them in the browser.
    // Tell Webpack to provide empty mocks for them so importing them works.
    node: {
      fs: 'empty',
      net: 'empty',
      tls: 'empty',
    },
    mode: 'production',
    // Minify the code.
    optimization: {
      minimize: true,
      minimizer: [new TerserPlugin({
        terserOptions: {
          format: {
            comments: false,
          },
        },
        extractComments: false,
        sourceMap: true,
        parallel: true,
      })],
    },
    performance: {
      hints: false,
      maxEntrypointSize: 512000,
      maxAssetSize: 512000
    },
  };
  