make it better

.env.example

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+REACT_APP_API_URL=http://localhost

.eslintrc

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+{
+  "extends": "react-app"
+}

.gitignore

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+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+ # Environment
+.env

config/env.js

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+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+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;
+if (!NODE_ENV) {
+  throw new Error(
+    'The NODE_ENV environment variable is required but was not specified.'
+  );
+}
+
+// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
+var 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
+  NODE_ENV !== 'test' && `${paths.dotenv}.local`,
+  paths.dotenv,
+].filter(Boolean);
+
+// Load environment variables from .env* files. Suppress warnings using silent
+// if this file is missing. dotenv will never modify any environment variables
+// that have already been set.
+// https://github.com/motdotla/dotenv
+dotenvFiles.forEach(dotenvFile => {
+  if (fs.existsSync(dotenvFile)) {
+    require('dotenv').config({
+      path: dotenvFile,
+    });
+  }
+});
+
+// We support resolving modules according to `NODE_PATH`.
+// This lets you use absolute paths in imports inside large monorepos:
+// https://github.com/facebookincubator/create-react-app/issues/253.
+// It works similar to `NODE_PATH` in Node itself:
+// https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders
+// Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.
+// Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims.
+// 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))
+  .join(path.delimiter);
+
+// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
+// injected into the application via DefinePlugin in Webpack configuration.
+const REACT_APP = /^REACT_APP_/i;
+
+function getClientEnvironment(publicUrl) {
+  const raw = Object.keys(process.env)
+    .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
+        // images into the `src` and `import` them in code to get their paths.
+        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;
+    }, {}),
+  };
+
+  return { raw, stringified };
+}
+
+module.exports = getClientEnvironment;

config/jest/cssTransform.js

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+'use strict';
+
+// This is a custom Jest transformer turning style imports into empty objects.
+// http://facebook.github.io/jest/docs/tutorial-webpack.html
+
+module.exports = {
+  process() {
+    return 'module.exports = {};';
+  },
+  getCacheKey() {
+    // The output is always the same.
+    return 'cssTransform';
+  },
+};

config/jest/fileTransform.js

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+'use strict';
+
+const path = require('path');
+
+// This is a custom Jest transformer turning file imports into filenames.
+// http://facebook.github.io/jest/docs/tutorial-webpack.html
+
+module.exports = {
+  process(src, filename) {
+    return `module.exports = ${JSON.stringify(path.basename(filename))};`;
+  },
+};

config/paths.js

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+'use strict';
+
+const path = require('path');
+const fs = require('fs');
+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 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;
+  }
+}
+
+const getPublicUrl = appPackageJson =>
+  envPublicUrl || require(appPackageJson).homepage;
+
+// We use `PUBLIC_URL` environment variable or "homepage" field to infer
+// "public path" at which the app is served.
+// Webpack needs to know it to put the right <script> hrefs into HTML even in
+// single-page apps that may serve index.html for nested URLs like /todos/42.
+// We can't use a relative path in HTML because we don't want to load something
+// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
+function getServedPath(appPackageJson) {
+  const publicUrl = getPublicUrl(appPackageJson);
+  const servedUrl =
+    envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : '/');
+  return ensureSlash(servedUrl, true);
+}
+
+// config after eject: we're in ./config/
+module.exports = {
+  dotenv: resolveApp('.env'),
+  appBuild: resolveApp('build'),
+  appPublic: resolveApp('public'),
+  appHtml: resolveApp('public/index.html'),
+  appIndexJs: resolveApp('src/index.js'),
+  appPackageJson: resolveApp('package.json'),
+  appSrc: resolveApp('src'),
+  yarnLockFile: resolveApp('yarn.lock'),
+  testsSetup: resolveApp('src/setupTests.js'),
+  appNodeModules: resolveApp('node_modules'),
+  publicUrl: getPublicUrl(resolveApp('package.json')),
+  servedPath: getServedPath(resolveApp('package.json')),
+};

config/polyfills.js

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+'use strict';
+
+if (typeof Promise === 'undefined') {
+  // Rejection tracking prevents a common issue where React gets into an
+  // inconsistent state due to an error, but it gets swallowed by a Promise,
+  // and the user has no idea what causes React's erratic future behavior.
+  require('promise/lib/rejection-tracking').enable();
+  window.Promise = require('promise/lib/es6-extensions.js');
+}
+
+// fetch() polyfill for making API calls.
+require('whatwg-fetch');
+
+// Object.assign() is commonly used with React.
+// It will use the native implementation if it's present and isn't buggy.
+Object.assign = require('object-assign');

config/webpack.config.dev.js

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+'use strict';
+
+const autoprefixer = require('autoprefixer');
+const path = require('path');
+const webpack = require('webpack');
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
+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 getClientEnvironment = require('./env');
+const paths = require('./paths');
+
+// 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);
+
+// 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: [
+    // 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'),
+    // We ship a few polyfills by default:
+    require.resolve('./polyfills'),
+    // Errors should be considered fatal in development
+    require.resolve('react-error-overlay'),
+    // 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: {
+    // Next line is not used in dev but WebpackDevServer crashes without it:
+    path: paths.appBuild,
+    // 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', '.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),
+    ],
+  },
+  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)$/,
+        enforce: 'pre',
+        use: [
+          {
+            options: {
+              formatter: eslintFormatter,
+              
+            },
+            loader: require.resolve('eslint-loader'),
+          },
+        ],
+        include: paths.appSrc,
+      },
+      // ** ADDING/UPDATING LOADERS **
+      // The "file" loader handles all assets unless explicitly excluded.
+      // The `exclude` list *must* be updated with every change to loader extensions.
+      // When adding a new loader, you must add its `test`
+      // as a new entry in the `exclude` list for "file" loader.
+
+      // "file" loader makes sure those assets get served by WebpackDevServer.
+      // When you `import` an asset, you get its (virtual) filename.
+      // In production, they would get copied to the `build` folder.
+      {
+        exclude: [
+          /\.html$/,
+          /\.(js|jsx)$/,
+          /\.css$/,
+          /\.json$/,
+          /\.bmp$/,
+          /\.gif$/,
+          /\.jpe?g$/,
+          /\.png$/,
+        ],
+        loader: require.resolve('file-loader'),
+        options: {
+          name: 'static/media/[name].[hash:8].[ext]',
+        },
+      },
+      // "url" loader works like "file" loader except that it embeds assets
+      // smaller than specified limit in bytes as data URLs to avoid requests.
+      // A missing `test` is equivalent to a match.
+      {
+        test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
+        loader: require.resolve('url-loader'),
+        options: {
+          limit: 10000,
+          name: 'static/media/[name].[hash:8].[ext]',
+        },
+      },
+      // Process JS with Babel.
+      {
+        test: /\.(js|jsx)$/,
+        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,
+            },
+          },
+          {
+            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',
+                }),
+              ],
+            },
+          },
+        ],
+      },
+      // ** STOP ** Are you adding a new loader?
+      // Remember to add the new extension(s) to the "file" loader exclusion list.
+    ],
+  },
+  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$/),
+  ],
+  // 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',
+  },
+  // 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,
+  },
+};

config/webpack.config.prod.js

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+'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 InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
+const SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin');
+const eslintFormatter = require('react-dev-utils/eslintFormatter');
+const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
+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.
+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 === './';
+// `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',
+    // 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', '.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),
+    ],
+  },
+  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)$/,
+        enforce: 'pre',
+        use: [
+          {
+            options: {
+              formatter: eslintFormatter,
+              
+            },
+            loader: require.resolve('eslint-loader'),
+          },
+        ],
+        include: paths.appSrc,
+      },
+      // ** ADDING/UPDATING LOADERS **
+      // The "file" loader handles all assets unless explicitly excluded.
+      // The `exclude` list *must* be updated with every change to loader extensions.
+      // When adding a new loader, you must add its `test`
+      // as a new entry in the `exclude` list in the "file" loader.
+
+      // "file" loader makes sure those assets end up in the `build` folder.
+      // When you `import` an asset, you get its filename.
+      {
+        exclude: [
+          /\.html$/,
+          /\.(js|jsx)$/,
+          /\.css$/,
+          /\.json$/,
+          /\.bmp$/,
+          /\.gif$/,
+          /\.jpe?g$/,
+          /\.png$/,
+        ],
+        loader: require.resolve('file-loader'),
+        options: {
+          name: 'static/media/[name].[hash:8].[ext]',
+        },
+      },
+      // "url" loader works just like "file" loader but it also embeds
+      // assets smaller than specified size as data URLs to avoid requests.
+      {
+        test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
+        loader: require.resolve('url-loader'),
+        options: {
+          limit: 10000,
+          name: 'static/media/[name].[hash:8].[ext]',
+        },
+      },
+      // Process JS with Babel.
+      {
+        test: /\.(js|jsx)$/,
+        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$/,
+        loader: ExtractTextPlugin.extract(
+          Object.assign(
+            {
+              fallback: require.resolve('style-loader'),
+              use: [
+                {
+                  loader: require.resolve('css-loader'),
+                  options: {
+                    importLoaders: 1,
+                    minimize: true,
+                    sourceMap: true,
+                  },
+                },
+                {
+                  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`.
+      },
+      // ** STOP ** Are you adding a new loader?
+      // Remember to add the new extension(s) to the "file" loader exclusion list.
+    ],
+  },
+  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,
+      },
+      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: true,
+    }),
+    // 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$/),
+  ],
+  // 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',
+  },
+};

config/webpackDevServer.config.js

@@ -0,0 +1,93 @@
+'use strict';
+
+const errorOverlayMiddleware = require('react-error-overlay/middleware');
+const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
+const config = require('./webpack.config.dev');
+const paths = require('./paths');
+
+const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
+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
+    // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
+    // However, it made several existing use cases such as development in cloud
+    // environment or subdomains in development significantly more complicated:
+    // https://github.com/facebookincubator/create-react-app/issues/2271
+    // https://github.com/facebookincubator/create-react-app/issues/2233
+    // While we're investigating better solutions, for now we will take a
+    // compromise. Since our WDS configuration only serves files in the `public`
+    // folder we won't consider accessing them a vulnerability. However, if you
+    // use the `proxy` feature, it gets more dangerous because it can expose
+    // remote code execution vulnerabilities in backends like Django and Rails.
+    // So we will disable the host check normally, but enable it if you have
+    // specified the `proxy` setting. Finally, we let you override it if you
+    // 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
+    // production build folder unless we copy them. However, copying the whole
+    // project directory is dangerous because we may expose sensitive files.
+    // Instead, we establish a convention that only files in `public` directory
+    // get served. Our build script will copy `public` into the `build` folder.
+    // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
+    // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
+    // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
+    // Note that we only recommend to use `public` folder as an escape hatch
+    // for files like `favicon.ico`, `manifest.json`, and libraries that are
+    // 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
+    watchOptions: {
+      ignored: /node_modules/,
+      poll: true
+    },
+    // Enable HTTPS if the HTTPS environment variable is set to 'true'
+    https: protocol === 'https',
+    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,
+    },
+    public: allowedHost,
+    proxy,
+    setup(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
+      // it used the same host and port.
+      // https://github.com/facebookincubator/create-react-app/issues/2272#issuecomment-302832432
+      app.use(noopServiceWorkerMiddleware());
+    },
+  };
+};

package.json

@@ -0,0 +1,111 @@
+{
+  "name": "product-comparison",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "autoprefixer": "7.1.1",
+    "babel-core": "6.25.0",
+    "babel-eslint": "7.2.3",
+    "babel-jest": "20.0.3",
+    "babel-loader": "7.0.0",
+    "babel-preset-react-app": "^3.0.1",
+    "babel-runtime": "6.23.0",
+    "bootstrap": "^4.0.0-alpha.6",
+    "case-sensitive-paths-webpack-plugin": "2.1.1",
+    "chalk": "1.1.3",
+    "css-loader": "0.28.4",
+    "dotenv": "^4.0.0",
+    "eslint": "3.19.0",
+    "eslint-config-react-app": "^1.0.5",
+    "eslint-loader": "1.7.1",
+    "eslint-plugin-flowtype": "2.34.0",
+    "eslint-plugin-import": "2.2.0",
+    "eslint-plugin-jsx-a11y": "5.0.3",
+    "eslint-plugin-react": "7.1.0",
+    "extract-text-webpack-plugin": "2.1.2",
+    "file-loader": "0.11.2",
+    "fs-extra": "3.0.1",
+    "html-webpack-plugin": "2.29.0",
+    "jest": "20.0.4",
+    "object-assign": "4.1.1",
+    "postcss-flexbugs-fixes": "3.0.0",
+    "postcss-loader": "2.0.6",
+    "promise": "7.1.1",
+    "react": "^15.6.1",
+    "react-addons-css-transition-group": "^15.6.0",
+    "react-addons-transition-group": "^15.6.0",
+    "react-dev-utils": "^3.0.2",
+    "react-dom": "^15.6.1",
+    "react-error-overlay": "^1.0.9",
+    "react-redux": "^5.0.5",
+    "react-router": "^4.1.1",
+    "react-router-dom": "^4.1.1",
+    "react-scripts": "^1.0.10",
+    "react-select": "^1.0.0-rc.5",
+    "reactstrap": "^4.8.0",
+    "redux": "^3.0.0",
+    "redux-logger": "^3.0.6",
+    "redux-thunk": "^2.2.0",
+    "style-loader": "0.18.2",
+    "sw-precache-webpack-plugin": "0.11.3",
+    "url-loader": "0.5.9",
+    "webpack": "2.6.1",
+    "webpack-dev-server": "2.5.0",
+    "webpack-manifest-plugin": "1.1.0",
+    "whatwg-fetch": "2.0.3"
+  },
+  "scripts": {
+    "start": "node scripts/start.js",
+    "build": "node scripts/build.js",
+    "test": "node scripts/test.js --env=jsdom"
+  },
+  "devDependencies": {
+    "babel-eslint": "^7.2.3",
+    "eslint": "^3.19.0",
+    "eslint-config-react-app": "^1.0.5",
+    "eslint-plugin-flowtype": "^2.33.0",
+    "eslint-plugin-import": "^2.2.0",
+    "eslint-plugin-jsx-a11y": "^5.0.1",
+    "eslint-plugin-react": "^7.0.1"
+  },
+  "jest": {
+    "collectCoverageFrom": [
+      "src/**/*.{js,jsx}"
+    ],
+    "setupFiles": [
+      "<rootDir>/config/polyfills.js"
+    ],
+    "testMatch": [
+      "<rootDir>/src/**/__tests__/**/*.js?(x)",
+      "<rootDir>/src/**/?(*.)(spec|test).js?(x)"
+    ],
+    "testEnvironment": "node",
+    "testURL": "http://localhost",
+    "transform": {
+      "^.+\\.(js|jsx)$": "<rootDir>/node_modules/babel-jest",
+      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
+      "^(?!.*\\.(js|jsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
+    },
+    "transformIgnorePatterns": [
+      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$"
+    ],
+    "moduleNameMapper": {
+      "^react-native$": "react-native-web"
+    },
+    "moduleFileExtensions": [
+      "web.js",
+      "js",
+      "json",
+      "web.jsx",
+      "jsx"
+    ]
+  },
+  "babel": {
+    "presets": [
+      "react-app"
+    ]
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  }
+}

public/index.html

@@ -0,0 +1,40 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <meta name="theme-color" content="#000000">
+    <!--
+      manifest.json provides metadata used when your web app is added to the
+      homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
+    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>
+      You need to enable JavaScript to run this app.
+    </noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

public/manifest.json

@@ -0,0 +1,15 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "192x192",
+      "type": "image/png"
+    }
+  ],
+  "start_url": "./index.html",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

scripts/build.js

@@ -0,0 +1,144 @@
+'use strict';
+
+// Do this as the first thing so that any code reading it knows the right env.
+process.env.BABEL_ENV = 'production';
+process.env.NODE_ENV = 'production';
+
+// Makes the script crash on unhandled rejections instead of silently
+// ignoring them. In the future, promise rejections that are not handled will
+// terminate the Node.js process with a non-zero exit code.
+process.on('unhandledRejection', err => {
+  throw err;
+});
+
+// Ensure environment variables are read.
+require('../config/env');
+
+const path = require('path');
+const chalk = require('chalk');
+const fs = require('fs-extra');
+const webpack = require('webpack');
+const config = require('../config/webpack.config.prod');
+const paths = require('../config/paths');
+const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
+const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
+const printHostingInstructions = require('react-dev-utils/printHostingInstructions');
+const FileSizeReporter = require('react-dev-utils/FileSizeReporter');
+
+const measureFileSizesBeforeBuild =
+  FileSizeReporter.measureFileSizesBeforeBuild;
+const printFileSizesAfterBuild = FileSizeReporter.printFileSizesAfterBuild;
+const useYarn = fs.existsSync(paths.yarnLockFile);
+
+// These sizes are pretty large. We'll warn for bundles exceeding them.
+const WARN_AFTER_BUNDLE_GZIP_SIZE = 512 * 1024;
+const WARN_AFTER_CHUNK_GZIP_SIZE = 1024 * 1024;
+
+// Warn and crash if required files are missing
+if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
+  process.exit(1);
+}
+
+// First, read the current file sizes in build directory.
+// This lets us display how much they changed later.
+measureFileSizesBeforeBuild(paths.appBuild)
+  .then(previousFileSizes => {
+    // Remove all content but keep the directory so that
+    // if you're in it, you don't end up in Trash
+    fs.emptyDirSync(paths.appBuild);
+    // Merge with the public folder
+    copyPublicFolder();
+    // Start the webpack build
+    return build(previousFileSizes);
+  })
+  .then(
+    ({ stats, previousFileSizes, warnings }) => {
+      if (warnings.length) {
+        console.log(chalk.yellow('Compiled with warnings.\n'));
+        console.log(warnings.join('\n\n'));
+        console.log(
+          '\nSearch for the ' +
+            chalk.underline(chalk.yellow('keywords')) +
+            ' to learn more about each warning.'
+        );
+        console.log(
+          'To ignore, add ' +
+            chalk.cyan('// eslint-disable-next-line') +
+            ' to the line before.\n'
+        );
+      } else {
+        console.log(chalk.green('Compiled successfully.\n'));
+      }
+
+      console.log('File sizes after gzip:\n');
+      printFileSizesAfterBuild(
+        stats,
+        previousFileSizes,
+        paths.appBuild,
+        WARN_AFTER_BUNDLE_GZIP_SIZE,
+        WARN_AFTER_CHUNK_GZIP_SIZE
+      );
+      console.log();
+
+      const appPackage = require(paths.appPackageJson);
+      const publicUrl = paths.publicUrl;
+      const publicPath = config.output.publicPath;
+      const buildFolder = path.relative(process.cwd(), paths.appBuild);
+      printHostingInstructions(
+        appPackage,
+        publicUrl,
+        publicPath,
+        buildFolder,
+        useYarn
+      );
+    },
+    err => {
+      console.log(chalk.red('Failed to compile.\n'));
+      console.log((err.message || err) + '\n');
+      process.exit(1);
+    }
+  );
+
+// Create the production build and print the deployment instructions.
+function build(previousFileSizes) {
+  console.log('Creating an optimized production build...');
+
+  let compiler = webpack(config);
+  return new Promise((resolve, reject) => {
+    compiler.run((err, stats) => {
+      if (err) {
+        return reject(err);
+      }
+      const messages = formatWebpackMessages(stats.toJson({}, true));
+      if (messages.errors.length) {
+        return reject(new Error(messages.errors.join('\n\n')));
+      }
+      if (
+        process.env.CI &&
+        (typeof process.env.CI !== 'string' ||
+          process.env.CI.toLowerCase() !== 'false') &&
+        messages.warnings.length
+      ) {
+        console.log(
+          chalk.yellow(
+            '\nTreating warnings as errors because process.env.CI = true.\n' +
+              'Most CI servers set it automatically.\n'
+          )
+        );
+        return reject(new Error(messages.warnings.join('\n\n')));
+      }
+      return resolve({
+        stats,
+        previousFileSizes,
+        warnings: messages.warnings,
+      });
+    });
+  });
+}
+
+function copyPublicFolder() {
+  fs.copySync(paths.appPublic, paths.appBuild, {
+    dereference: true,
+    filter: file => file !== paths.appHtml,
+  });
+}

scripts/start.js

@@ -0,0 +1,92 @@
+'use strict';
+
+// Do this as the first thing so that any code reading it knows the right env.
+process.env.BABEL_ENV = 'development';
+process.env.NODE_ENV = 'development';
+
+// Makes the script crash on unhandled rejections instead of silently
+// ignoring them. In the future, promise rejections that are not handled will
+// terminate the Node.js process with a non-zero exit code.
+process.on('unhandledRejection', err => {
+  throw err;
+});
+
+// Ensure environment variables are read.
+require('../config/env');
+
+const fs = require('fs');
+const chalk = require('chalk');
+const webpack = require('webpack');
+const WebpackDevServer = require('webpack-dev-server');
+const clearConsole = require('react-dev-utils/clearConsole');
+const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
+const {
+  choosePort,
+  createCompiler,
+  prepareProxy,
+  prepareUrls,
+} = require('react-dev-utils/WebpackDevServerUtils');
+const openBrowser = require('react-dev-utils/openBrowser');
+const paths = require('../config/paths');
+const config = require('../config/webpack.config.dev');
+const createDevServerConfig = require('../config/webpackDevServer.config');
+
+const useYarn = fs.existsSync(paths.yarnLockFile);
+const isInteractive = process.stdout.isTTY;
+
+// Warn and crash if required files are missing
+if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
+  process.exit(1);
+}
+
+// Tools like Cloud9 rely on this.
+const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
+const HOST = process.env.HOST || '0.0.0.0';
+
+// We attempt to use the default port but if it is busy, we offer the user to
+// run on a different port. `detect()` Promise resolves to the next free port.
+choosePort(HOST, DEFAULT_PORT)
+  .then(port => {
+    if (port == null) {
+      // We have not found a port.
+      return;
+    }
+    const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
+    const appName = require(paths.appPackageJson).name;
+    const urls = prepareUrls(protocol, HOST, port);
+    // Create a webpack compiler that is configured with custom messages.
+    const compiler = createCompiler(webpack, config, appName, urls, useYarn);
+    // Load proxy config
+    const proxySetting = require(paths.appPackageJson).proxy;
+    const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
+    // Serve webpack assets generated by the compiler over a web sever.
+    const serverConfig = createDevServerConfig(
+      proxyConfig,
+      urls.lanUrlForConfig
+    );
+    const devServer = new WebpackDevServer(compiler, serverConfig);
+    // Launch WebpackDevServer.
+    devServer.listen(port, HOST, err => {
+      if (err) {
+        return console.log(err);
+      }
+      if (isInteractive) {
+        clearConsole();
+      }
+      console.log(chalk.cyan('Starting the development server...\n'));
+      openBrowser(urls.localUrlForBrowser);
+    });
+
+    ['SIGINT', 'SIGTERM'].forEach(function(sig) {
+      process.on(sig, function() {
+        devServer.close();
+        process.exit();
+      });
+    });
+  })
+  .catch(err => {
+    if (err && err.message) {
+      console.log(err.message);
+    }
+    process.exit(1);
+  });

scripts/test.js

@@ -0,0 +1,27 @@
+'use strict';
+
+// Do this as the first thing so that any code reading it knows the right env.
+process.env.BABEL_ENV = 'test';
+process.env.NODE_ENV = 'test';
+process.env.PUBLIC_URL = '';
+
+// Makes the script crash on unhandled rejections instead of silently
+// ignoring them. In the future, promise rejections that are not handled will
+// terminate the Node.js process with a non-zero exit code.
+process.on('unhandledRejection', err => {
+  throw err;
+});
+
+// Ensure environment variables are read.
+require('../config/env');
+
+const jest = require('jest');
+const argv = process.argv.slice(2);
+
+// Watch unless on CI or in coverage mode
+if (!process.env.CI && argv.indexOf('--coverage') < 0) {
+  argv.push('--watch');
+}
+
+
+jest.run(argv);

src/actions/index.js

@@ -0,0 +1 @@
+export * from './product';

src/actions/product.js

@@ -0,0 +1,18 @@
+import * as types from '../constants/types';
+
+export function getProducts() {
+  return dispatch => {
+    fetch(`${process.env.REACT_APP_API_URL}/v1/api/products`)
+      .then(response => response.json())
+      .then(response => {
+        dispatch({
+          type: types.FETCH_PRODUCTS,
+          payload: response
+        });
+      })
+  }
+}
+
+export function compare(product) {
+  return {type: types.COMPARE_PRODUCT, product};
+}

src/components/Compare/index.css

@@ -0,0 +1,65 @@
+.compare table {
+  background-color: #fff;
+  border-radius: 5px;
+  overflow: hidden;
+  box-shadow: 0px 13px 21px -5px rgba(0, 0, 0, 0.05);
+  border: 1px solid #eee;
+  font-size: 18px;
+  table-layout: fixed;
+}
+
+.compare .thead-default th {
+  background-color: #fff;
+}
+
+.compare table tr > td,
+.compare table tr > th {
+  padding-top: 25px;
+  padding-bottom: 25px;
+  text-align: center;
+}
+
+.compare table thead th {
+  font-size: 20px;
+  color: #393c45;
+  font-weight: normal;
+}
+
+.compare table th[scope="row"] {
+  font-size: 20px;
+  color: #393c45;
+  font-weight: normal;
+  background-color: #f9f9f9;
+  border: 1px solid #eee;
+  text-align: left;
+  padding-left: 45px;
+}
+
+.compare table tr.condition {
+  color: #fff;
+  font-size: 20px;
+}
+
+.compare table tr.colors span {
+  height: 20px;
+  width: 20px;
+  background-color: #000;
+  display: inline-block;
+  margin-right: 5px;
+  border-radius: 100%;
+}
+
+.compare table td.red,
+.compare table tr.colors span.red {
+  background-color: #ff715b;
+}
+
+.compare table td.green,
+.compare table tr.colors span.green {
+  background-color: #48cfad;
+}
+
+.compare table td.blue,
+.compare table tr.colors span.blue {
+  background-color: #0197F6;
+}

src/components/Compare/index.js

@@ -0,0 +1,140 @@
+import React from 'react'
+import {Table} from 'reactstrap'
+import './index.css'
+
+const Compare = ({products}) =>
+  <div className="row compare">
+    <div className="col-12 mt-5 text-center">
+      <div className={(products.length < 2
+        ? 'hidden-xs-up'
+        : '')}>
+        <Table>
+          <thead className="thead-default">
+          <tr>
+            <th></th>
+            {products.map(product =>
+              <th key={product.id}>
+                {product.name}
+              </th>
+            )}
+          </tr>
+          </thead>
+          <tbody>
+            <tr className="price">
+              <th scope="row">Price</th>
+              {products.map(product =>
+                <td key={product.id} className="text-center">{product.price}</td>
+              )}
+            </tr>
+            <tr className="colors">
+              <th scope="row">Colors</th>
+              {products.map(product =>
+                <td key={product.id}>
+                {product.colors.map((color, index) =>
+                    <span key={index} className={color}></span>
+                )}
+                </td>
+              )}
+            </tr>
+            <tr className="condition">
+              <th scope="row">Condition</th>
+              {products.map(product =>
+                <td key={product.id} className={product.condition === "Used" ? "red" : "green"}>
+                  {product.condition}
+                </td>
+              )}
+            </tr>
+          </tbody>
+        </Table>
+      </div>
+    </div>
+  </div>;
+// const Compare = ({products}) =>
+//   <div className="row">
+//     <div className="col-12 mt-5">
+//       <h3 className={"text-center " + (products.length > 1 ? 'hidden-xs-up' : '')}>
+//         Select two or more products
+//       </h3>
+//
+//       <div className={(products.length < 2 ? 'hidden-xs-up' : '')}>
+//         <Table>
+//           <thead>
+//           <tr>
+//             <th></th>
+//             {products.map(product =>
+//               <td key={product.id}>
+//                 <img width="100%"
+//                      src={`${process.env.REACT_APP_API_URL}/v1/api/products/image/${product.img}`}
+//                      alt={product.name}/>
+//               </td>
+//             )}
+//           </tr>
+//           </thead>
+//           <tbody>
+//           <tr>
+//             <th>Name</th>
+//             {products.map(product =>
+//               <td key={product.id} className="text-center">{product.name}</td>
+//             )}
+//           </tr>
+//           <tr>
+//             <th>Categories</th>
+//             {products.map(product =>
+//               <td key={product.id}>
+//                 {product.categories.map((category, index) =>
+//                   <div className="text-center category" key={index}>{category}</div>
+//                 )}
+//               </td>
+//             )}
+//           </tr>
+//           <tr>
+//             <th>Balance Transfer Rates</th>
+//             {products.map(product =>
+//               <td key={product.id} className="text-center">
+//                 <div className="rate">{product.rates.balance.rate}% for up to</div>
+//                 <div className="period">{product.rates.balance.period} months</div>
+//                 <div className="fee">({product.rates.balance.fee}% handling fee)</div>
+//               </td>
+//             )}
+//           </tr>
+//           <tr>
+//             <th>Money Transfer Rates</th>
+//             {products.map(product =>
+//               <td key={product.id} className="text-center">
+//                 <div className="rate">{product.rates.money.rate}% for up to</div>
+//                 <div className="period">{product.rates.money.period} months</div>
+//                 <div className="fee">({product.rates.money.fee}% handling fee)</div>
+//               </td>
+//             )}
+//           </tr>
+//           <tr>
+//             <th>Card Purchases</th>
+//             {products.map(product =>
+//               <td key={product.id} className="text-center">
+//                 <div className="rate">{product.rates.purchases.rate}% for up to</div>
+//                 <div className="period">{product.rates.purchases.period} months</div>
+//                 <div className="fee">({product.rates.purchases.fee}% handling fee)</div>
+//               </td>
+//             )}
+//           </tr>
+//           <tr>
+//             <th>Additional Info</th>
+//             {products.map(product =>
+//               <td key={product.id} className="text-center">{product.info}</td>
+//             )}
+//           </tr>
+//           <tr className="text-center">
+//             <td></td>
+//             {products.map(product =>
+//               <td key={product.id}>
+//                 <Button color="primary">More info</Button>
+//               </td>
+//             )}
+//           </tr>
+//           </tbody>
+//         </Table>
+//       </div>
+//     </div>
+//   </div>;
+
+export default Compare;

src/components/Header/index.css

@@ -0,0 +1,3 @@
+header {
+  margin-top: 10vh;
+}

src/components/Header/index.js

@@ -0,0 +1,17 @@
+import React from 'react'
+import './index.css'
+
+export default class Header extends React.Component {
+  render() {
+    return (
+      <div className="container">
+        <header>
+          <div className="row">
+            <div className="col-12 text-center">
+            </div>
+          </div>
+        </header>
+      </div>
+    );
+  }
+}

src/components/Product/index.css

@@ -0,0 +1,102 @@
+.product {
+  cursor: pointer;
+  position: relative;
+  padding-bottom: 100px;
+  border-radius: 5px;
+  overflow: hidden;
+  -webkit-transition: all 500ms ease-out;
+     -moz-transition: all 500ms ease-out;
+       -o-transition: all 500ms ease-out;
+          transition: all 500ms ease-out;
+}
+
+.product:hover {
+  box-shadow: 0px 13px 21px -5px rgba(0, 0, 0, 0.2);
+}
+
+.product img {
+  width: 100%;
+}
+
+.stats-container {
+  background: #fff;
+  padding: 25px 15px;
+  position: absolute;
+  bottom: 0;
+  width: 100%;
+}
+
+.stats-container .product_name {
+  font-size: 22px;
+  color: #393c45;
+}
+
+.stats-container p {
+  font-size: 16px;
+  color: #b1b1b3;
+  margin: 0;
+}
+
+.stats-container .product_price {
+  float: right;
+  color: #48cfad;
+  font-size: 22px;
+  font-weight: 600;
+}
+
+.image_overlay {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: #48cfad;
+  opacity: 0;
+  -webkit-transition: all 200ms ease-out;
+  -moz-transition: all 200ms ease-out;
+  -o-transition: all 200ms ease-out;
+  transition: all 200ms ease-out;
+}
+
+.product.compare .image_overlay,
+.product:hover .image_overlay {
+  opacity: 0.7;
+}
+
+.view_details {
+  position: absolute;
+  top: 112px;
+  left: 50%;
+  margin-left: -85px;
+  border: 2px solid #fff;
+  color: #fff;
+  font-size: 19px;
+  text-align: center;
+  text-transform: uppercase;
+  font-weight: 700;
+  padding: 10px 0;
+  width: 172px;
+  opacity: 0;
+  -webkit-transition: all 200ms ease-out;
+  -moz-transition: all 200ms ease-out;
+  -o-transition: all 200ms ease-out;
+  transition: all 200ms ease-out;
+}
+
+.view_details:hover {
+  background: #fff;
+  color: #48cfad;
+  cursor: pointer;
+}
+
+.product:hover .view_details {
+  opacity: 1;
+  width: 152px;
+  font-size: 15px;
+  margin-left: -75px;
+  top: 150px;
+  -webkit-transition: all 200ms ease-out;
+  -moz-transition: all 200ms ease-out;
+  -o-transition: all 200ms ease-out;
+  transition: all 200ms ease-out;
+}

src/components/Product/index.js

@@ -0,0 +1,34 @@
+import React from 'react'
+import './index.css'
+
+// const Product = ({product, compare}) =>
+//     <div key={product.id} className="col-3 product-card">
+//       <Card inverse
+//             onClick={() => compare(product)}
+//             color={product.compare ? "success" : "primary"}
+//       >
+//         <CardBlock>
+//           <CardTitle>{product.name}</CardTitle>
+//         </CardBlock>
+//       </Card>
+//     </div>;
+
+const Product = ({product, compare}) =>
+    <div key={product.id} className="col-3">
+        <div className={"product " + (product.compare ? "compare" : "")} >
+            <img src={product.image} alt={product.name} />
+            <div className="image_overlay"></div>
+            <div className="view_details" onClick={() => compare(product)}>
+              {product.compare ? "Remove" : "Compare"}
+            </div>
+            <div className="stats">
+                <div className="stats-container">
+                    <span className="product_price">{product.price}</span>
+                    <span className="product_name">{product.name}</span>
+                    <p>Men's running shirt</p>
+                </div>
+            </div>
+        </div>
+    </div>;
+
+export default Product;

src/components/ProductList/index.js

@@ -0,0 +1,13 @@
+import React from 'react'
+import Product from '../Product'
+
+const ProductList = ({products, compare}) =>
+  <div>
+    <div className="row mt-3">
+        {products.map(product =>
+          <Product key={product.id} product={product} compare={compare} />
+        )}
+    </div>
+  </div>;
+
+export default ProductList;

src/constants/types.js

@@ -0,0 +1,2 @@
+export const FETCH_PRODUCTS = 'FETCH_PRODUCTS';
+export const COMPARE_PRODUCT = 'COMPARE_PRODUCT';

src/containers/App/index.js

@@ -0,0 +1,25 @@
+import React, {Component} from 'react';
+import Header from '../../components/Header'
+import {Route, Switch} from 'react-router-dom'
+
+import './style.css';
+
+import Home from '../Home';
+import NotFound from '../NotFound';
+
+export default class App extends Component {
+  render() {
+    return (
+      <div className="App">
+        <Header />
+
+        <div className="container mt-4">
+          <Switch>
+            <Route exact path="/" component={Home}/>
+            <Route component={NotFound}/>
+          </Switch>
+        </div>
+      </div>
+    );
+  }
+}

src/containers/Home/index.js

@@ -0,0 +1,42 @@
+import React from 'react';
+import {bindActionCreators} from 'redux';
+import ProductList from '../../components/ProductList';
+import Compare from '../../components/Compare';
+import * as productActions from '../../actions';
+import {connect} from 'react-redux';
+
+class Home extends React.Component {
+  componentWillMount() {
+    this.props.actions.getProducts();
+  }
+
+  render() {
+
+    const {products, actions} = this.props;
+    const compareProducts = products.filter(product => product.compare);
+
+    return (
+      <div className="Home mt-5">
+        <ProductList products={products} compare={actions.compare}/>
+        <Compare products={compareProducts}/>
+      </div>
+    );
+  }
+}
+
+function mapStateToProps(state) {
+  return {
+    products: state.product.products
+  }
+}
+
+function mapDispatchToProps(dispatch) {
+  return {
+    actions: bindActionCreators(productActions, dispatch)
+  };
+}
+
+export default connect(
+  mapStateToProps,
+  mapDispatchToProps
+)(Home);

src/containers/NotFound/index.js

@@ -0,0 +1,12 @@
+import React from 'react'
+
+export default class NotFound extends React.Component {
+  render() {
+    return (
+      <div>
+        <h1>404</h1>
+        <h3>Page not found</h3>
+      </div>
+    );
+  }
+}

src/index.css

@@ -0,0 +1,7 @@
+body {
+  margin: 0;
+  padding: 0;
+  font-family: sans-serif;
+	background: #eaebec;
+  color: #393c45;
+}

src/index.js

@@ -0,0 +1,31 @@
+import registerServiceWorker from './registerServiceWorker';
+import React from 'react';
+import ReactDOM from 'react-dom';
+import {BrowserRouter} from 'react-router-dom'
+import {createStore, applyMiddleware} from 'redux'
+import {Provider} from 'react-redux'
+import thunkMiddleware from 'redux-thunk'
+import { createLogger } from 'redux-logger'
+import reducer from './reducers'
+import App from './containers/App'
+
+import 'bootstrap/dist/css/bootstrap.css'
+import './index.css'
+
+const loggerMiddleware = createLogger()
+
+const store = createStore(
+  reducer,
+  applyMiddleware(
+    thunkMiddleware, // lets us dispatch() functions
+    loggerMiddleware // neat middleware that logs actions
+  )
+)
+
+ReactDOM.render(
+  <Provider store={store}>
+    <BrowserRouter>
+      <App />
+    </BrowserRouter>
+  </Provider>, document.getElementById('root'));
+registerServiceWorker();

src/reducers/index.js

@@ -0,0 +1,8 @@
+import { combineReducers } from 'redux'
+import product from './product_reducer'
+
+const compareApp = combineReducers({
+  product
+})
+
+export default compareApp

src/reducers/product_reducer.js

@@ -0,0 +1,26 @@
+import * as types from '../constants/types';
+
+const INITIAL_STATE = {
+  products: []
+};
+
+export default function (state = INITIAL_STATE, action) {
+  switch (action.type) {
+    case types.FETCH_PRODUCTS:
+      return {
+        ...state, products: action.payload.map(product =>
+          ({...product, compare: false})
+        )
+      };
+    case types.COMPARE_PRODUCT:
+      return {
+        ...state, products: state.products.map(product =>
+          product.id === action.product.id ?
+            ({...product, compare: !product.compare}) :
+            product
+        )
+      };
+    default:
+      return state;
+  }
+}

src/registerServiceWorker.js

@@ -0,0 +1,108 @@
+// In production, we register a service worker to serve assets from local cache.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on the "N+1" visit to a page, since previously
+// cached resources are updated in the background.
+
+// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
+// This link also includes instructions on opting out of this behavior.
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.1/8 is considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+export default function register() {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (!isLocalhost) {
+        // Is not local host. Just register service worker
+        registerValidSW(swUrl);
+      } else {
+        // This is running on localhost. Lets check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the old content will have been purged and
+              // the fresh content will have been added to the cache.
+              // It's the perfect time to display a "New content is
+              // available; please refresh." message in your web app.
+              console.log('New content is available; please refresh.');
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl)
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      if (
+        response.status === 404 ||
+        response.headers.get('content-type').indexOf('javascript') === -1
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready.then(registration => {
+      registration.unregister();
+    });
+  }
+}