diff --git a/config/env.js b/config/env.js
index 30a6c7f1..c4178db5 100644
--- a/config/env.js
+++ b/config/env.js
@@ -1,4 +1,3 @@
-'use strict';
 
 const fs = require('fs');
 const path = require('path');
@@ -7,7 +6,8 @@ const paths = require('./paths');
 // Make sure that including paths.js after env.js will read .env variables.
 delete require.cache[require.resolve('./paths')];
 
-const NODE_ENV = process.env.NODE_ENV;
+const { NODE_ENV } = process.env;
+
 if (!NODE_ENV) {
   throw new Error(
     'The NODE_ENV environment variable is required but was not specified.'
@@ -15,9 +15,10 @@ if (!NODE_ENV) {
 }
 
 // https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
-var dotenvFiles = [
+const dotenvFiles = [
   `${paths.dotenv}.${NODE_ENV}.local`,
   `${paths.dotenv}.${NODE_ENV}`,
+
   // Don't include `.env.local` for `test` environment
   // since normally you expect tests to produce the same
   // results for everyone
@@ -30,7 +31,7 @@ var dotenvFiles = [
 // that have already been set.  Variable expansion is supported in .env files.
 // https://github.com/motdotla/dotenv
 // https://github.com/motdotla/dotenv-expand
-dotenvFiles.forEach(dotenvFile => {
+dotenvFiles.forEach((dotenvFile) => {
   if (fs.existsSync(dotenvFile)) {
     require('dotenv-expand')(
       require('dotenv').config({
@@ -50,10 +51,11 @@ dotenvFiles.forEach(dotenvFile => {
 // https://github.com/facebookincubator/create-react-app/issues/1023#issuecomment-265344421
 // We also resolve them to make sure all tools using them work consistently.
 const appDirectory = fs.realpathSync(process.cwd());
+
 process.env.NODE_PATH = (process.env.NODE_PATH || '')
   .split(path.delimiter)
-  .filter(folder => folder && !path.isAbsolute(folder))
-  .map(folder => path.resolve(appDirectory, folder))
+  .filter((folder) => folder && !path.isAbsolute(folder))
+  .map((folder) => path.resolve(appDirectory, folder))
   .join(path.delimiter);
 
 // Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
@@ -62,16 +64,19 @@ const REACT_APP = /^REACT_APP_/i;
 
 function getClientEnvironment(publicUrl) {
   const raw = Object.keys(process.env)
-    .filter(key => REACT_APP.test(key))
+    .filter((key) => REACT_APP.test(key))
     .reduce(
       (env, key) => {
         env[key] = process.env[key];
+
         return env;
       },
       {
+
         // Useful for determining whether we’re running in production mode.
         // Most importantly, it switches React into the correct mode.
         NODE_ENV: process.env.NODE_ENV || 'development',
+
         // Useful for resolving the correct path to static assets in `public`.
         // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />.
         // This should only be used as an escape hatch. Normally you would put
@@ -79,10 +84,12 @@ function getClientEnvironment(publicUrl) {
         PUBLIC_URL: publicUrl,
       }
     );
+
   // Stringify all values so we can feed into Webpack DefinePlugin
   const stringified = {
     'process.env': Object.keys(raw).reduce((env, key) => {
       env[key] = JSON.stringify(raw[key]);
+
       return env;
     }, {}),
   };
diff --git a/config/jest/cssTransform.js b/config/jest/cssTransform.js
index 8f651148..4e138d18 100644
--- a/config/jest/cssTransform.js
+++ b/config/jest/cssTransform.js
@@ -1,4 +1,3 @@
-'use strict';
 
 // This is a custom Jest transformer turning style imports into empty objects.
 // http://facebook.github.io/jest/docs/en/webpack.html
diff --git a/config/jest/fileTransform.js b/config/jest/fileTransform.js
index 9e4047d3..1162d1dd 100644
--- a/config/jest/fileTransform.js
+++ b/config/jest/fileTransform.js
@@ -1,4 +1,3 @@
-'use strict';
 
 const path = require('path');
 
diff --git a/config/paths.js b/config/paths.js
index 0ec6667c..875467cd 100644
--- a/config/paths.js
+++ b/config/paths.js
@@ -1,4 +1,3 @@
-'use strict';
 
 const path = require('path');
 const fs = require('fs');
@@ -7,22 +6,23 @@ const url = require('url');
 // Make sure any symlinks in the project folder are resolved:
 // https://github.com/facebookincubator/create-react-app/issues/637
 const appDirectory = fs.realpathSync(process.cwd());
-const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
+const resolveApp = (relativePath) => path.resolve(appDirectory, relativePath);
 
 const envPublicUrl = process.env.PUBLIC_URL;
 
 function ensureSlash(path, needsSlash) {
   const hasSlash = path.endsWith('/');
+
   if (hasSlash && !needsSlash) {
     return path.substr(path, path.length - 1);
   } else if (!hasSlash && needsSlash) {
     return `${path}/`;
-  } else {
-    return path;
   }
+
+  return path;
 }
 
-const getPublicUrl = appPackageJson =>
+const getPublicUrl = (appPackageJson) =>
   envPublicUrl || require(appPackageJson).homepage;
 
 // We use `PUBLIC_URL` environment variable or "homepage" field to infer
@@ -34,6 +34,7 @@ const getPublicUrl = appPackageJson =>
 function getServedPath(appPackageJson) {
   const publicUrl = getPublicUrl(appPackageJson);
   const servedUrl = envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : '/');
+
   return ensureSlash(servedUrl, true);
 }
 
diff --git a/config/polyfills.js b/config/polyfills.js
index 66dff0a8..1e503e8b 100644
--- a/config/polyfills.js
+++ b/config/polyfills.js
@@ -1,4 +1,3 @@
-'use strict';
 
 if (typeof Promise === 'undefined') {
   // Rejection tracking prevents a common issue where React gets into an
diff --git a/config/webpack.config.dev.js b/config/webpack.config.dev.js
index 9cccca44..2a09a3c2 100644
--- a/config/webpack.config.dev.js
+++ b/config/webpack.config.dev.js
@@ -1,7 +1,6 @@
-'use strict';
 
-const autoprefixer = require('autoprefixer');
 const path = require('path');
+const autoprefixer = require('autoprefixer');
 const webpack = require('webpack');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
@@ -9,265 +8,301 @@ const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
 const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
 const eslintFormatter = require('react-dev-utils/eslintFormatter');
 const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
+const ExtractTextPlugin = require('extract-text-webpack-plugin');
 const getClientEnvironment = require('./env');
 const paths = require('./paths');
-const ExtractTextPlugin = require('extract-text-webpack-plugin');
 
 // Webpack uses `publicPath` to determine where the app is being served from.
 // In development, we always serve from the root. This makes config easier.
 const 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_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
 const publicUrl = '';
+
 // Get environment variables to inject into our app.
 const env = getClientEnvironment(publicUrl);
 
 const postCssLoader = {
-    loader: require.resolve('postcss-loader'),
-    options: {
-        // Necessary for external CSS imports to work
-        // https://github.com/facebookincubator/create-react-app/issues/2677
-        ident: 'postcss',
-        plugins: () => [
-            require('postcss-flexbugs-fixes'),
-            autoprefixer({
-                browsers: [
-                    '>1%',
-                    'last 4 versions',
-                    'Firefox ESR',
-                    'not ie < 9', // React doesn't support IE8 anyway
-                ],
-                flexbox: 'no-2009',
-            }),
+  loader: require.resolve('postcss-loader'),
+  options: {
+
+    // Necessary for external CSS imports to work
+    // https://github.com/facebookincubator/create-react-app/issues/2677
+    ident: 'postcss',
+    plugins: () => [
+      require('postcss-flexbugs-fixes'),
+      autoprefixer({
+        browsers: [
+          '>1%',
+          'last 4 versions',
+          'Firefox ESR',
+          'not ie < 9',
         ],
-    },
+        flexbox: 'no-2009',
+      }),
+    ],
+  },
 };
 
 // This is the development configuration.
 // It is focused on developer experience and fast rebuilds.
 // The production configuration is different and lives in a separate file.
 module.exports = {
-    // You may want 'eval' instead if you prefer to see the compiled output in DevTools.
-    // See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
-    devtool: 'cheap-module-source-map',
-    // These are the "entry points" to our application.
-    // This means they will be the "root" imports that are included in JS bundle.
-    // The first two entry points enable "hot" CSS and auto-refreshes for JS.
-    entry: [
-        // We ship a few polyfills by default:
-        require.resolve('./polyfills'),
-        // Include an alternative client for WebpackDevServer. A client's job is to
-        // connect to WebpackDevServer by a socket and get notified about changes.
-        // When you save a file, the client will either apply hot updates (in case
-        // of CSS changes), or refresh the page (in case of JS changes). When you
-        // make a syntax error, this client will display a syntax error overlay.
-        // Note: instead of the default WebpackDevServer client, we use a custom one
-        // to bring better experience for Create React App users. You can replace
-        // the line below with these two lines if you prefer the stock client:
-        // require.resolve('webpack-dev-server/client') + '?/',
-        // require.resolve('webpack/hot/dev-server'),
-        require.resolve('react-dev-utils/webpackHotDevClient'),
-        // Finally, this is your app's code:
-        paths.appIndexJs,
-        // We include the app code last so that if there is a runtime error during
-        // initialization, it doesn't blow up the WebpackDevServer client, and
-        // changing JS code would still trigger a refresh.
-    ],
-    output: {
-        // Add /* filename */ comments to generated require()s in the output.
-        pathinfo: true,
-        // This does not produce a real file. It's just the virtual path that is
-        // served by WebpackDevServer in development. This is the JS bundle
-        // containing code from all our entry points, and the Webpack runtime.
-        filename: 'static/js/bundle.js',
-        // There are also additional JS chunk files if you use code splitting.
-        chunkFilename: 'static/js/[name].chunk.js',
-        // This is the URL that app is served from. We use "/" in development.
-        publicPath: publicPath,
-        // Point sourcemap entries to original disk location (format as URL on Windows)
-        devtoolModuleFilenameTemplate: info =>
-            path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'),
-    },
-    resolve: {
-        // This allows you to set a fallback for where Webpack should look for modules.
-        // 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(
-            // It is guaranteed to exist because we tweak it in `env.js`
-            process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
-        ),
-        // 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
-        // `web` extension prefixes have been added for better support
-        // for React Native Web.
-        extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
-        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',
-        },
-        plugins: [
-            // Prevents users from importing files from outside of src/ (or node_modules/).
-            // This often causes confusion because we only process files within src/ with babel.
-            // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
-            // please link the files into your node_modules/ and let module-resolution kick in.
-            // Make sure your source files are compiled, as they will not be processed in any way.
-            new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
-        ],
-    },
-    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 } },
+  // You may want 'eval' instead if you prefer to see the compiled output in DevTools.
+  // See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
+  devtool: 'cheap-module-source-map',
 
-            // First, run the linter.
-            // It's important to do this before Babel processes the JS.
-            {
-                test: /\.(js|jsx|mjs)$/,
-                enforce: 'pre',
-                use: [
-                    {
-                        options: {
-                            formatter: eslintFormatter,
-                            eslintPath: require.resolve('eslint'),
+  // These are the "entry points" to our application.
+  // This means they will be the "root" imports that are included in JS bundle.
+  // The first two entry points enable "hot" CSS and auto-refreshes for JS.
+  entry: [
 
-                        },
-                        loader: require.resolve('eslint-loader'),
-                    },
-                ],
-                include: paths.appSrc,
-            },
-            {
-                // "oneOf" will traverse all following loaders until one will
-                // match the requirements. When no loader matches it will fall
-                // back to the "file" loader at the end of the loader list.
-                oneOf: [
-                    // "url" loader works like "file" loader except that it embeds assets
-                    // smaller than specified limit in bytes as data URLs to avoid requests.
-                    // A missing `test` is equivalent to a match.
-                    {
-                        test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
-                        loader: require.resolve('url-loader'),
-                        options: {
-                            limit: 10000,
-                            name: 'static/media/[name].[hash:8].[ext]',
-                        },
-                    },
-                    // Process JS with Babel.
-                    {
-                        test: /\.(js|jsx|mjs)$/,
-                        include: paths.appSrc,
-                        loader: require.resolve('babel-loader'),
-                        options: {
+    // We ship a few polyfills by default:
+    require.resolve('./polyfills'),
 
-                            // This is a feature of `babel-loader` for webpack (not Babel itself).
-                            // It enables caching results in ./node_modules/.cache/babel-loader/
-                            // directory for faster rebuilds.
-                            cacheDirectory: true,
-                        },
-                    },
-                    // "postcss" loader applies autoprefixer to our CSS.
-                    // "css" loader resolves paths in CSS and adds assets as dependencies.
-                    // "style" loader turns CSS into JS modules that inject <style> tags.
-                    // In production, we use a plugin to extract that CSS to a file, but
-                    // in development "style" loader enables hot editing of CSS.
-                    {
-                        test: /\.css$/,
-                        use: [
-                            require.resolve('style-loader'),
-                            {
-                                loader: require.resolve('css-loader'),
-                                options: {
-                                    importLoaders: 1,
-                                },
-                            },
-                            postCssLoader,
-                        ],
-                    },
-                    {
-                        test: /\.scss$/,
-                        use: ExtractTextPlugin.extract({
-                            fallback: 'style-loader',
-                            use: ['css-loader', 'sass-loader', postCssLoader]
-                        })
-                    },
-                    // "file" loader makes sure those assets get served by WebpackDevServer.
-                    // When you `import` an asset, you get its (virtual) filename.
-                    // In production, they would get copied to the `build` folder.
-                    // This loader doesn't use a "test" so it will catch all modules
-                    // that fall through the other loaders.
-                    {
-                        // Exclude `js` files to keep "css" loader working as it injects
-                        // its runtime that would otherwise processed through "file" loader.
-                        // Also exclude `html` and `json` extensions so they get processed
-                        // by webpacks internal loaders.
-                        exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
-                        loader: require.resolve('file-loader'),
-                        options: {
-                            name: 'static/media/[name].[hash:8].[ext]',
-                        },
-                    },
-                ],
-            },
-            // ** STOP ** Are you adding a new loader?
-            // Make sure to add the new loader(s) before the "file" loader.
-        ],
+    // Include an alternative client for WebpackDevServer. A client's job is to
+    // connect to WebpackDevServer by a socket and get notified about changes.
+    // When you save a file, the client will either apply hot updates (in case
+    // of CSS changes), or refresh the page (in case of JS changes). When you
+    // make a syntax error, this client will display a syntax error overlay.
+    // Note: instead of the default WebpackDevServer client, we use a custom one
+    // to bring better experience for Create React App users. You can replace
+    // the line below with these two lines if you prefer the stock client:
+    // require.resolve('webpack-dev-server/client') + '?/',
+    // require.resolve('webpack/hot/dev-server'),
+    require.resolve('react-dev-utils/webpackHotDevClient'),
+
+    // Finally, this is your app's code:
+    paths.appIndexJs,
+
+    // We include the app code last so that if there is a runtime error during
+    // initialization, it doesn't blow up the WebpackDevServer client, and
+    // changing JS code would still trigger a refresh.
+  ],
+  output: {
+
+    // Add /* filename */ comments to generated require()s in the output.
+    pathinfo: true,
+
+    // This does not produce a real file. It's just the virtual path that is
+    // served by WebpackDevServer in development. This is the JS bundle
+    // containing code from all our entry points, and the Webpack runtime.
+    filename: 'static/js/bundle.js',
+
+    // There are also additional JS chunk files if you use code splitting.
+    chunkFilename: 'static/js/[name].chunk.js',
+
+    // This is the URL that app is served from. We use "/" in development.
+    publicPath,
+
+    // Point sourcemap entries to original disk location (format as URL on Windows)
+    devtoolModuleFilenameTemplate: (info) =>
+      path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'),
+  },
+  resolve: {
+
+    // This allows you to set a fallback for where Webpack should look for modules.
+    // 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(
+
+      // It is guaranteed to exist because we tweak it in `env.js`
+      process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
+    ),
+
+    // 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
+    // `web` extension prefixes have been added for better support
+    // for React Native Web.
+    extensions: [ '.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx' ],
+    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',
     },
     plugins: [
-        // 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 development, this will be an empty string.
-        new InterpolateHtmlPlugin(env.raw),
-        // Generates an `index.html` file with the <script> injected.
-        new HtmlWebpackPlugin({
-            inject: true,
-            template: paths.appHtml,
-        }),
-        // Add module names to factory functions so they appear in browser profiler.
-        new webpack.NamedModulesPlugin(),
-        // Makes some environment variables available to the JS code, for example:
-        // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
-        new webpack.DefinePlugin(env.stringified),
-        // This is necessary to emit hot updates (currently CSS only):
-        new webpack.HotModuleReplacementPlugin(),
-        // Watcher doesn't work well if you mistype casing in a path so we use
-        // a plugin that prints an error when you attempt to do this.
-        // See https://github.com/facebookincubator/create-react-app/issues/240
-        new CaseSensitivePathsPlugin(),
-        // If you require a missing module and then `npm install` it, you still have
-        // to restart the development server for Webpack to discover it. This plugin
-        // makes the discovery automatic so you don't have to restart.
-        // See https://github.com/facebookincubator/create-react-app/issues/186
-        new WatchMissingNodeModulesPlugin(paths.appNodeModules),
-        // Moment.js is an extremely popular library that bundles large locale files
-        // by default due to how Webpack interprets its code. This is a practical
-        // solution that requires the user to opt into importing specific locales.
-        // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
-        // You can remove this if you don't use Moment.js:
-        new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
-        new ExtractTextPlugin('main.css'),
+
+      // Prevents users from importing files from outside of src/ (or node_modules/).
+      // This often causes confusion because we only process files within src/ with babel.
+      // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
+      // please link the files into your node_modules/ and let module-resolution kick in.
+      // Make sure your source files are compiled, as they will not be processed in any way.
+      new ModuleScopePlugin(paths.appSrc, [ paths.appPackageJson ]),
     ],
-    // Some libraries import Node modules but don't use them in the browser.
-    // Tell Webpack to provide empty mocks for them so importing them works.
-    node: {
-        dgram: 'empty',
-        fs: 'empty',
-        net: 'empty',
-        tls: 'empty',
-        child_process: 'empty',
-    },
-    // Turn off performance hints during development because we don't do any
-    // splitting or minification in interest of speed. These warnings become
-    // cumbersome.
-    performance: {
-        hints: false,
-    },
+  },
+  module: {
+    strictExportPresence: true,
+    rules: [
+
+      // TODO: Disable require.ensure as it's not a standard language feature.
+      // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
+      // { parser: { requireEnsure: false } },
+
+      // First, run the linter.
+      // It's important to do this before Babel processes the JS.
+      {
+        test: /\.(js|jsx|mjs)$/,
+        enforce: 'pre',
+        use: [
+          {
+            options: {
+              formatter: eslintFormatter,
+              eslintPath: require.resolve('eslint'),
+
+            },
+            loader: require.resolve('eslint-loader'),
+          },
+        ],
+        include: paths.appSrc,
+      },
+      {
+
+        // "oneOf" will traverse all following loaders until one will
+        // match the requirements. When no loader matches it will fall
+        // back to the "file" loader at the end of the loader list.
+        oneOf: [
+
+          // "url" loader works like "file" loader except that it embeds assets
+          // smaller than specified limit in bytes as data URLs to avoid requests.
+          // A missing `test` is equivalent to a match.
+          {
+            test: [ /\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/ ],
+            loader: require.resolve('url-loader'),
+            options: {
+              limit: 10000,
+              name: 'static/media/[name].[hash:8].[ext]',
+            },
+          },
+
+          // Process JS with Babel.
+          {
+            test: /\.(js|jsx|mjs)$/,
+            include: paths.appSrc,
+            loader: require.resolve('babel-loader'),
+            options: {
+
+              // This is a feature of `babel-loader` for webpack (not Babel itself).
+              // It enables caching results in ./node_modules/.cache/babel-loader/
+              // directory for faster rebuilds.
+              cacheDirectory: true,
+            },
+          },
+
+          // "postcss" loader applies autoprefixer to our CSS.
+          // "css" loader resolves paths in CSS and adds assets as dependencies.
+          // "style" loader turns CSS into JS modules that inject <style> tags.
+          // In production, we use a plugin to extract that CSS to a file, but
+          // in development "style" loader enables hot editing of CSS.
+          {
+            test: /\.css$/,
+            use: [
+              require.resolve('style-loader'),
+              {
+                loader: require.resolve('css-loader'),
+                options: {
+                  importLoaders: 1,
+                },
+              },
+              postCssLoader,
+            ],
+          },
+          {
+            test: /\.scss$/,
+            use: ExtractTextPlugin.extract({
+              fallback: 'style-loader',
+              use: [ 'css-loader', 'sass-loader', postCssLoader ],
+            }),
+          },
+
+          // "file" loader makes sure those assets get served by WebpackDevServer.
+          // When you `import` an asset, you get its (virtual) filename.
+          // In production, they would get copied to the `build` folder.
+          // This loader doesn't use a "test" so it will catch all modules
+          // that fall through the other loaders.
+          {
+
+            // Exclude `js` files to keep "css" loader working as it injects
+            // its runtime that would otherwise processed through "file" loader.
+            // Also exclude `html` and `json` extensions so they get processed
+            // by webpacks internal loaders.
+            exclude: [ /\.(js|jsx|mjs)$/, /\.html$/, /\.json$/ ],
+            loader: require.resolve('file-loader'),
+            options: {
+              name: 'static/media/[name].[hash:8].[ext]',
+            },
+          },
+        ],
+      },
+
+      // ** STOP ** Are you adding a new loader?
+      // Make sure to add the new loader(s) before the "file" loader.
+    ],
+  },
+  plugins: [
+
+    // 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 development, this will be an empty string.
+    new InterpolateHtmlPlugin(env.raw),
+
+    // Generates an `index.html` file with the <script> injected.
+    new HtmlWebpackPlugin({
+      inject: true,
+      template: paths.appHtml,
+    }),
+
+    // Add module names to factory functions so they appear in browser profiler.
+    new webpack.NamedModulesPlugin(),
+
+    // Makes some environment variables available to the JS code, for example:
+    // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
+    new webpack.DefinePlugin(env.stringified),
+
+    // This is necessary to emit hot updates (currently CSS only):
+    new webpack.HotModuleReplacementPlugin(),
+
+    // Watcher doesn't work well if you mistype casing in a path so we use
+    // a plugin that prints an error when you attempt to do this.
+    // See https://github.com/facebookincubator/create-react-app/issues/240
+    new CaseSensitivePathsPlugin(),
+
+    // If you require a missing module and then `npm install` it, you still have
+    // to restart the development server for Webpack to discover it. This plugin
+    // makes the discovery automatic so you don't have to restart.
+    // See https://github.com/facebookincubator/create-react-app/issues/186
+    new WatchMissingNodeModulesPlugin(paths.appNodeModules),
+
+    // Moment.js is an extremely popular library that bundles large locale files
+    // by default due to how Webpack interprets its code. This is a practical
+    // solution that requires the user to opt into importing specific locales.
+    // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
+    // You can remove this if you don't use Moment.js:
+    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
+    new ExtractTextPlugin('main.css'),
+  ],
+
+  // 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: {
+    dgram: 'empty',
+    fs: 'empty',
+    net: 'empty',
+    tls: 'empty',
+    child_process: 'empty',
+  },
+
+  // Turn off performance hints during development because we don't do any
+  // splitting or minification in interest of speed. These warnings become
+  // cumbersome.
+  performance: {
+    hints: false,
+  },
 };
diff --git a/config/webpack.config.prod.js b/config/webpack.config.prod.js
index c4a6f06b..f2519179 100644
--- a/config/webpack.config.prod.js
+++ b/config/webpack.config.prod.js
@@ -1,7 +1,6 @@
-'use strict';
 
-const autoprefixer = require('autoprefixer');
 const path = require('path');
+const autoprefixer = require('autoprefixer');
 const webpack = require('webpack');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const ExtractTextPlugin = require('extract-text-webpack-plugin');
@@ -16,22 +15,26 @@ 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.
 const publicPath = paths.servedPath;
+
 // 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 === './';
+
 // Source maps are resource heavy and can cause out of memory issue for large source files.
 const shouldUseSourceMap = process.env.GENERATE_SOURCEMAP !== 'false';
+
 // `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.');
+  throw new Error('Production builds must have NODE_ENV=production.');
 }
 
 // Note: defined here because it will be used more than once.
@@ -41,305 +44,342 @@ const cssFilename = 'static/css/[name].[contenthash:8].css';
 // (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.
+// Making sure that the publicPath goes back to to build folder.
 const extractTextPluginOptions = shouldUseRelativeAssetPaths
-    ? // Making sure that the publicPath goes back to to build folder.
-    {publicPath: Array(cssFilename.split('/').length).join('../')}
-    : {};
+  ? { 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: shouldUseSourceMap ? 'source-map' : false,
-    // 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',
-        // We inferred the "public path" (such as / or /my-project) from homepage.
-        publicPath: publicPath,
-        // Point sourcemap entries to original disk location (format as URL on Windows)
-        devtoolModuleFilenameTemplate: info =>
-            path
-                .relative(paths.appSrc, info.absoluteResourcePath)
-                .replace(/\\/g, '/'),
-    },
-    resolve: {
-        // This allows you to set a fallback for where Webpack should look for modules.
-        // 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(
-            // It is guaranteed to exist because we tweak it in `env.js`
-            process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
-        ),
-        // 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
-        // `web` extension prefixes have been added for better support
-        // for React Native Web.
-        extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
-        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',
-        },
-        plugins: [
-            // Prevents users from importing files from outside of src/ (or node_modules/).
-            // This often causes confusion because we only process files within src/ with babel.
-            // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
-            // please link the files into your node_modules/ and let module-resolution kick in.
-            // Make sure your source files are compiled, as they will not be processed in any way.
-            new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
-        ],
-    },
-    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 } },
+  // Don't attempt to continue if there are any errors.
+  bail: true,
 
-            // First, run the linter.
-            // It's important to do this before Babel processes the JS.
-            {
-                test: /\.(js|jsx|mjs)$/,
-                enforce: 'pre',
-                use: [
-                    {
-                        options: {
-                            formatter: eslintFormatter,
-                            eslintPath: require.resolve('eslint'),
+  // We generate sourcemaps in production. This is slow but gives good results.
+  // You can exclude the *.map files from the build during deployment.
+  devtool: shouldUseSourceMap ? 'source-map' : false,
 
-                        },
-                        loader: require.resolve('eslint-loader'),
-                    },
-                ],
-                include: paths.appSrc,
-            },
-            {
-                // "oneOf" will traverse all following loaders until one will
-                // match the requirements. When no loader matches it will fall
-                // back to the "file" loader at the end of the loader list.
-                oneOf: [
-                    // "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]',
-                        },
-                    },
-                    // Process JS with Babel.
-                    {
-                        test: /\.(js|jsx|mjs)$/,
-                        include: paths.appSrc,
-                        loader: require.resolve('babel-loader'),
-                        options: {
+  // In production, we only want to load the polyfills and the app code.
+  entry: [ require.resolve('./polyfills'), paths.appIndexJs ],
+  output: {
 
-                            compact: true,
-                        },
-                    },
-                    // 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: [/\.css$/, /\.scss$/],
-                        loader: ExtractTextPlugin.extract(
-                            Object.assign(
-                                {
-                                    fallback: {
-                                        loader: require.resolve('style-loader'),
-                                        options: {
-                                            hmr: false,
-                                        },
-                                    },
-                                    use: [
-                                        {
-                                            loader: require.resolve('css-loader'),
-                                            options: {
-                                                importLoaders: 1,
-                                                minimize: true,
-                                                sourceMap: shouldUseSourceMap,
-                                            },
-                                        },
-                                        {
-                                            loader: require.resolve('sass-loader'),
-                                        },
-                                        {
-                                            loader: require.resolve('postcss-loader'),
-                                            options: {
-                                                // Necessary for external CSS imports to work
-                                                // https://github.com/facebookincubator/create-react-app/issues/2677
-                                                ident: 'postcss',
-                                                plugins: () => [
-                                                    require('postcss-flexbugs-fixes'),
-                                                    autoprefixer({
-                                                        browsers: [
-                                                            '>1%',
-                                                            'last 4 versions',
-                                                            'Firefox ESR',
-                                                            'not ie < 9', // React doesn't support IE8 anyway
-                                                        ],
-                                                        flexbox: 'no-2009',
-                                                    }),
-                                                ],
-                                            },
-                                        },
-                                    ],
-                                },
-                                extractTextPluginOptions
-                            )
-                        ),
-                        // Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
-                    },
-                    // "file" loader makes sure assets end up in the `build` folder.
-                    // When you `import` an asset, you get its filename.
-                    // This loader doesn't use a "test" so it will catch all modules
-                    // that fall through the other loaders.
-                    {
-                        loader: require.resolve('file-loader'),
-                        // Exclude `js` files to keep "css" loader working as it injects
-                        // it's runtime that would otherwise processed through "file" loader.
-                        // Also exclude `html` and `json` extensions so they get processed
-                        // by webpacks internal loaders.
-                        exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
-                        options: {
-                            name: 'static/media/[name].[hash:8].[ext]',
-                        },
-                    },
-                    // ** STOP ** Are you adding a new loader?
-                    // Make sure to add the new loader(s) before the "file" loader.
-                ],
-            },
-        ],
+    // 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',
+
+    // We inferred the "public path" (such as / or /my-project) from homepage.
+    publicPath,
+
+    // Point sourcemap entries to original disk location (format as URL on Windows)
+    devtoolModuleFilenameTemplate: (info) =>
+      path
+        .relative(paths.appSrc, info.absoluteResourcePath)
+        .replace(/\\/g, '/'),
+  },
+  resolve: {
+
+    // This allows you to set a fallback for where Webpack should look for modules.
+    // 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(
+
+      // It is guaranteed to exist because we tweak it in `env.js`
+      process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
+    ),
+
+    // 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
+    // `web` extension prefixes have been added for better support
+    // for React Native Web.
+    extensions: [ '.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx' ],
+    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',
     },
     plugins: [
-        // 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(env.raw),
-        // Generates an `index.html` file with the <script> injected.
-        new HtmlWebpackPlugin({
-            inject: true,
-            template: paths.appHtml,
-            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 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),
-        // Minify the code.
-        new webpack.optimize.UglifyJsPlugin({
-            compress: {
-                warnings: false,
-                // Disabled because of an issue with Uglify breaking seemingly valid code:
-                // https://github.com/facebookincubator/create-react-app/issues/2376
-                // Pending further investigation:
-                // https://github.com/mishoo/UglifyJS2/issues/2011
-                comparisons: false,
-            },
-            mangle: {
-                safari10: true,
-            },
-            output: {
-                comments: false,
-                // Turned on because emoji and regex is not minified properly using default
-                // https://github.com/facebookincubator/create-react-app/issues/2488
-                ascii_only: true,
-            },
-            sourceMap: shouldUseSourceMap,
-        }),
-        // 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',
-        }),
-        // Generate a service worker script that will precache, and keep up to date,
-        // the HTML & assets that are part of the Webpack build.
-        new SWPrecacheWebpackPlugin({
-            // By default, a cache-busting query parameter is appended to requests
-            // used to populate the caches, to ensure the responses are fresh.
-            // If a URL is already hashed by Webpack, then there is no concern
-            // about it being stale, and the cache-busting can be skipped.
-            dontCacheBustUrlsMatching: /\.\w{8}\./,
-            filename: 'service-worker.js',
-            logger(message) {
-                if (message.indexOf('Total precache size is') === 0) {
-                    // This message occurs for every build and is a bit too noisy.
-                    return;
-                }
-                if (message.indexOf('Skipping static resource') === 0) {
-                    // This message obscures real errors so we ignore it.
-                    // https://github.com/facebookincubator/create-react-app/issues/2612
-                    return;
-                }
-                console.log(message);
-            },
-            minify: true,
-            // For unknown URLs, fallback to the index page
-            navigateFallback: publicUrl + '/index.html',
-            // Ignores URLs starting from /__ (useful for Firebase):
-            // https://github.com/facebookincubator/create-react-app/issues/2237#issuecomment-302693219
-            navigateFallbackWhitelist: [/^(?!\/__).*/],
-            // Don't precache sourcemaps (they're large) and build asset manifest:
-            staticFileGlobsIgnorePatterns: [/\.map$/, /asset-manifest\.json$/],
-        }),
-        // Moment.js is an extremely popular library that bundles large locale files
-        // by default due to how Webpack interprets its code. This is a practical
-        // solution that requires the user to opt into importing specific locales.
-        // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
-        // You can remove this if you don't use Moment.js:
-        new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
+
+      // Prevents users from importing files from outside of src/ (or node_modules/).
+      // This often causes confusion because we only process files within src/ with babel.
+      // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
+      // please link the files into your node_modules/ and let module-resolution kick in.
+      // Make sure your source files are compiled, as they will not be processed in any way.
+      new ModuleScopePlugin(paths.appSrc, [ paths.appPackageJson ]),
     ],
-    // Some libraries import Node modules but don't use them in the browser.
-    // Tell Webpack to provide empty mocks for them so importing them works.
-    node: {
-        dgram: 'empty',
-        fs: 'empty',
-        net: 'empty',
-        tls: 'empty',
-        child_process: 'empty',
-    },
+  },
+  module: {
+    strictExportPresence: true,
+    rules: [
+
+      // TODO: Disable require.ensure as it's not a standard language feature.
+      // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
+      // { parser: { requireEnsure: false } },
+
+      // First, run the linter.
+      // It's important to do this before Babel processes the JS.
+      {
+        test: /\.(js|jsx|mjs)$/,
+        enforce: 'pre',
+        use: [
+          {
+            options: {
+              formatter: eslintFormatter,
+              eslintPath: require.resolve('eslint'),
+
+            },
+            loader: require.resolve('eslint-loader'),
+          },
+        ],
+        include: paths.appSrc,
+      },
+      {
+
+        // "oneOf" will traverse all following loaders until one will
+        // match the requirements. When no loader matches it will fall
+        // back to the "file" loader at the end of the loader list.
+        oneOf: [
+
+          // "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]',
+            },
+          },
+
+          // Process JS with Babel.
+          {
+            test: /\.(js|jsx|mjs)$/,
+            include: paths.appSrc,
+            loader: require.resolve('babel-loader'),
+            options: {
+
+              compact: true,
+            },
+          },
+
+          // The notation here is somewhat confusing.
+          // "postcss" loader applies autoprefixer to our CSS.
+          // "css" loader resolves paths in CSS and adds assets as dependencies.
+          // "style" loader normally turns CSS into JS modules injecting <style>,
+          // but unlike in development configuration, we do something different.
+          // `ExtractTextPlugin` first applies the "postcss" and "css" loaders
+          // (second argument), then grabs the result CSS and puts it into a
+          // separate file in our build process. This way we actually ship
+          // a single CSS file in production instead of JS code injecting <style>
+          // tags. If you use code splitting, however, any async bundles will still
+          // use the "style" loader inside the async code so CSS from them won't be
+          // in the main CSS file.
+          {
+            test: [ /\.css$/, /\.scss$/ ],
+            loader: ExtractTextPlugin.extract(
+              Object.assign(
+                {
+                  fallback: {
+                    loader: require.resolve('style-loader'),
+                    options: {
+                      hmr: false,
+                    },
+                  },
+                  use: [
+                    {
+                      loader: require.resolve('css-loader'),
+                      options: {
+                        importLoaders: 1,
+                        minimize: true,
+                        sourceMap: shouldUseSourceMap,
+                      },
+                    },
+                    {
+                      loader: require.resolve('sass-loader'),
+                    },
+                    {
+                      loader: require.resolve('postcss-loader'),
+                      options: {
+
+                        // Necessary for external CSS imports to work
+                        // https://github.com/facebookincubator/create-react-app/issues/2677
+                        ident: 'postcss',
+                        plugins: () => [
+                          require('postcss-flexbugs-fixes'),
+                          autoprefixer({
+                            browsers: [
+                              '>1%',
+                              'last 4 versions',
+                              'Firefox ESR',
+                              'not ie < 9',
+                            ],
+                            flexbox: 'no-2009',
+                          }),
+                        ],
+                      },
+                    },
+                  ],
+                },
+                extractTextPluginOptions
+              )
+            ),
+
+            // Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
+          },
+
+          // "file" loader makes sure assets end up in the `build` folder.
+          // When you `import` an asset, you get its filename.
+          // This loader doesn't use a "test" so it will catch all modules
+          // that fall through the other loaders.
+          {
+            loader: require.resolve('file-loader'),
+
+            // Exclude `js` files to keep "css" loader working as it injects
+            // it's runtime that would otherwise processed through "file" loader.
+            // Also exclude `html` and `json` extensions so they get processed
+            // by webpacks internal loaders.
+            exclude: [ /\.(js|jsx|mjs)$/, /\.html$/, /\.json$/ ],
+            options: {
+              name: 'static/media/[name].[hash:8].[ext]',
+            },
+          },
+
+          // ** STOP ** Are you adding a new loader?
+          // Make sure to add the new loader(s) before the "file" loader.
+        ],
+      },
+    ],
+  },
+  plugins: [
+
+    // 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(env.raw),
+
+    // Generates an `index.html` file with the <script> injected.
+    new HtmlWebpackPlugin({
+      inject: true,
+      template: paths.appHtml,
+      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 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),
+
+    // Minify the code.
+    new webpack.optimize.UglifyJsPlugin({
+      compress: {
+        warnings: false,
+
+        // Disabled because of an issue with Uglify breaking seemingly valid code:
+        // https://github.com/facebookincubator/create-react-app/issues/2376
+        // Pending further investigation:
+        // https://github.com/mishoo/UglifyJS2/issues/2011
+        comparisons: false,
+      },
+      mangle: {
+        safari10: true,
+      },
+      output: {
+        comments: false,
+
+        // Turned on because emoji and regex is not minified properly using default
+        // https://github.com/facebookincubator/create-react-app/issues/2488
+        ascii_only: true,
+      },
+      sourceMap: shouldUseSourceMap,
+    }),
+
+    // 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',
+    }),
+
+    // Generate a service worker script that will precache, and keep up to date,
+    // the HTML & assets that are part of the Webpack build.
+    new SWPrecacheWebpackPlugin({
+
+      // By default, a cache-busting query parameter is appended to requests
+      // used to populate the caches, to ensure the responses are fresh.
+      // If a URL is already hashed by Webpack, then there is no concern
+      // about it being stale, and the cache-busting can be skipped.
+      dontCacheBustUrlsMatching: /\.\w{8}\./,
+      filename: 'service-worker.js',
+      logger(message) {
+        if (message.indexOf('Total precache size is') === 0) {
+          // This message occurs for every build and is a bit too noisy.
+          return;
+        }
+        if (message.indexOf('Skipping static resource') === 0) {
+          // This message obscures real errors so we ignore it.
+          // https://github.com/facebookincubator/create-react-app/issues/2612
+          return;
+        }
+
+        console.log(message); // eslint-disable-line
+      },
+      minify: true,
+
+      // For unknown URLs, fallback to the index page
+      navigateFallback: `${publicUrl}/index.html`,
+
+      // Ignores URLs starting from /__ (useful for Firebase):
+      // https://github.com/facebookincubator/create-react-app/issues/2237#issuecomment-302693219
+      navigateFallbackWhitelist: [ /^(?!\/__).*/ ],
+
+      // Don't precache sourcemaps (they're large) and build asset manifest:
+      staticFileGlobsIgnorePatterns: [ /\.map$/, /asset-manifest\.json$/ ],
+    }),
+
+    // Moment.js is an extremely popular library that bundles large locale files
+    // by default due to how Webpack interprets its code. This is a practical
+    // solution that requires the user to opt into importing specific locales.
+    // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
+    // You can remove this if you don't use Moment.js:
+    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
+  ],
+
+  // 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: {
+    dgram: 'empty',
+    fs: 'empty',
+    net: 'empty',
+    tls: 'empty',
+    child_process: 'empty',
+  },
 };
diff --git a/config/webpackDevServer.config.js b/config/webpackDevServer.config.js
index f12d3159..f91c7d41 100644
--- a/config/webpackDevServer.config.js
+++ b/config/webpackDevServer.config.js
@@ -1,4 +1,3 @@
-'use strict';
 
 const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
 const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
@@ -11,6 +10,7 @@ const host = process.env.HOST || '0.0.0.0';
 
 module.exports = function(proxy, allowedHost) {
   return {
+
     // WebpackDevServer 2.4.3 introduced a security fix that prevents remote
     // websites from potentially accessing local content through DNS rebinding:
     // https://github.com/webpack/webpack-dev-server/issues/887
@@ -29,11 +29,14 @@ module.exports = function(proxy, allowedHost) {
     // really know what you're doing with a special environment variable.
     disableHostCheck:
       !proxy || process.env.DANGEROUSLY_DISABLE_HOST_CHECK === 'true',
+
     // Enable gzip compression of generated files.
     compress: true,
+
     // Silence WebpackDevServer's own logs since they're generally not useful.
     // It will still show compile warnings and errors with this setting.
     clientLogLevel: 'none',
+
     // By default WebpackDevServer serves physical files from current directory
     // in addition to all the virtual build products that it serves from memory.
     // This is confusing because those files won’t automatically be available in
@@ -49,20 +52,25 @@ module.exports = function(proxy, allowedHost) {
     // for some reason broken when imported through Webpack. If you just want to
     // use an image, put it in `src` and `import` it from JavaScript instead.
     contentBase: paths.appPublic,
+
     // By default files from `contentBase` will not trigger a page reload.
     watchContentBase: true,
+
     // Enable hot reloading server. It will provide /sockjs-node/ endpoint
     // for the WebpackDevServer client so it can learn when the files were
     // updated. The WebpackDevServer client is included as an entry point
     // in the Webpack development configuration. Note that only changes
     // to CSS are currently hot reloaded. JS changes will refresh the browser.
     hot: true,
+
     // It is important to tell WebpackDevServer to use the same "root" path
     // as we specified in the config. In development, we always serve from /.
     publicPath: config.output.publicPath,
+
     // WebpackDevServer is noisy by default so we emit custom message instead
     // by listening to the compiler events with `compiler.plugin` calls above.
     quiet: true,
+
     // Reportedly, this avoids CPU overload on some systems.
     // https://github.com/facebookincubator/create-react-app/issues/293
     // src/node_modules is not ignored to support absolute imports
@@ -70,11 +78,13 @@ module.exports = function(proxy, allowedHost) {
     watchOptions: {
       ignored: ignoredFiles(paths.appSrc),
     },
+
     // Enable HTTPS if the HTTPS environment variable is set to 'true'
     https: protocol === 'https',
-    host: host,
+    host,
     overlay: false,
     historyApiFallback: {
+
       // Paths with dots should still use the history fallback.
       // See https://github.com/facebookincubator/create-react-app/issues/387.
       disableDotRule: true,
@@ -84,6 +94,7 @@ module.exports = function(proxy, allowedHost) {
     before(app) {
       // This lets us open files from the runtime error overlay.
       app.use(errorOverlayMiddleware());
+
       // This service worker file is effectively a 'no-op' that will reset any
       // previous service worker registered for the same host:port combination.
       // We do this in development to avoid hitting the production cache if
diff --git a/package.json b/package.json
index dd044c0b..d1fafd62 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "private": false,
   "scripts": {
     "lint": "yarn lint:js && yarn lint:css",
-    "lint:js": "eslint src test scripts",
+    "lint:js": "eslint src test scripts config",
     "lint:js:fix": "yarn lint:js --fix",
     "lint:css": "stylelint src/**/*.scss",
     "lint:css:fix": "yarn lint:css --fix",