truffle init

config/env.js

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+// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
+// injected into the application via DefinePlugin in Webpack configuration.
+
+var REACT_APP = /^REACT_APP_/i;
+
+function getClientEnvironment(publicUrl) {
+  var processEnv = Object
+    .keys(process.env)
+    .filter(key => REACT_APP.test(key))
+    .reduce((env, key) => {
+      env[key] = JSON.stringify(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': JSON.stringify(
+        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': JSON.stringify(publicUrl)
+    });
+  return {'process.env': processEnv};
+}
+
+module.exports = getClientEnvironment;

config/jest/cssTransform.js

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+// 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(fileData, filename) {
+    // The output is always the same.
+    return 'cssTransform';
+  },
+};

config/jest/fileTransform.js

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+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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+var path = require('path');
+var fs = require('fs');
+
+// Make sure any symlinks in the project folder are resolved:
+// https://github.com/facebookincubator/create-react-app/issues/637
+var appDirectory = fs.realpathSync(process.cwd());
+function resolveApp(relativePath) {
+  return path.resolve(appDirectory, relativePath);
+}
+
+// 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
+
+// We will export `nodePaths` as an array of absolute paths.
+// It will then be used by Webpack configs.
+// Jest doesn’t need this because it already handles `NODE_PATH` out of the box.
+
+// 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
+
+var nodePaths = (process.env.NODE_PATH || '')
+  .split(process.platform === 'win32' ? ';' : ':')
+  .filter(Boolean)
+  .filter(folder => !path.isAbsolute(folder))
+  .map(resolveApp);
+
+// config after eject: we're in ./config/
+module.exports = {
+  // Changed from build to build_webpack so smart contract compilations are not overwritten.
+  appBuild: resolveApp('build_webpack'),
+  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'),
+  ownNodeModules: resolveApp('node_modules'),
+  nodePaths: nodePaths
+};

config/polyfills.js

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+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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+var autoprefixer = require('autoprefixer');
+var webpack = require('webpack');
+var HtmlWebpackPlugin = require('html-webpack-plugin');
+var CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
+var InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
+var WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
+var getClientEnvironment = require('./env');
+var 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.
+var 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.
+var publicUrl = '';
+// Get environment variables to inject into our app.
+var 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'),
+    // 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',
+    // This is the URL that app is served from. We use "/" in development.
+    publicPath: publicPath
+  },
+  resolve: {
+    // This allows you to set a fallback for where Webpack should look for modules.
+    // We read `NODE_PATH` environment variable in `paths.js` and pass paths here.
+    // We use `fallback` instead of `root` because we want `node_modules` to "win"
+    // if there any conflicts. This matches Node resolution mechanism.
+    // https://github.com/facebookincubator/create-react-app/issues/253
+    fallback: paths.nodePaths,
+    // These are the reasonable defaults supported by the Node ecosystem.
+    // We also include JSX as a common component filename extension to support
+    // some tools, although we do not recommend using it, see:
+    // https://github.com/facebookincubator/create-react-app/issues/290
+    extensions: ['.js', '.json', '.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'
+    }
+  },
+
+  module: {
+    // First, run the linter.
+    // It's important to do this before Babel processes the JS.
+    preLoaders: [
+      {
+        test: /\.(js|jsx)$/,
+        loader: 'eslint',
+        include: paths.appSrc,
+      }
+    ],
+    loaders: [
+      // Default loader: load all assets that are not handled
+      // by other loaders with the url loader.
+      // Note: This list needs to be updated with every change of extensions
+      // the other loaders match.
+      // E.g., when adding a loader for a new supported file extension,
+      // we need to add the supported extension to this loader too.
+      // Add one new line in `exclude` for each loader.
+      //
+      // "file" loader makes sure those assets get served by WebpackDevServer.
+      // When you `import` an asset, you get its (virtual) filename.
+      // In production, they would get copied to the `build` folder.
+      // "url" loader works like "file" loader except that it embeds assets
+      // smaller than specified limit in bytes as data URLs to avoid requests.
+      // A missing `test` is equivalent to a match.
+      {
+        exclude: [
+          /\.html$/,
+          /\.(js|jsx)$/,
+          /\.css$/,
+          /\.json$/,
+          /\.woff$/,
+          /\.woff2$/,
+          /\.(ttf|svg|eot)$/
+        ],
+        loader: 'url',
+        query: {
+          limit: 10000,
+          name: 'static/media/[name].[hash:8].[ext]'
+        }
+      },
+      // Process JS with Babel.
+      {
+        test: /\.(js|jsx)$/,
+        include: paths.appSrc,
+        loader: 'babel',
+        query: {
+
+          // This is a feature of `babel-loader` for webpack (not Babel itself).
+          // It enables caching results in ./node_modules/.cache/babel-loader/
+          // directory for faster rebuilds.
+          cacheDirectory: true
+        }
+      },
+      // "postcss" loader applies autoprefixer to our CSS.
+      // "css" loader resolves paths in CSS and adds assets as dependencies.
+      // "style" loader turns CSS into JS modules that inject <style> tags.
+      // In production, we use a plugin to extract that CSS to a file, but
+      // in development "style" loader enables hot editing of CSS.
+      {
+        test: /\.css$/,
+        loader: 'style!css?importLoaders=1!postcss'
+      },
+      // JSON is not enabled by default in Webpack but both Node and Browserify
+      // allow it implicitly so we also enable it.
+      {
+        test: /\.json$/,
+        loader: 'json'
+      },
+      // "file" loader for svg
+      {
+        test: /\.svg$/,
+        loader: 'file',
+        query: {
+          name: 'static/media/[name].[hash:8].[ext]'
+        }
+      },
+      // "file" loader for fonts
+      {
+        test: /\.woff$/,
+        loader: 'file',
+        query: {
+          name: 'fonts/[name].[hash].[ext]'
+        }
+      },
+      {
+        test: /\.woff2$/,
+        loader: 'file',
+        query: {
+          name: 'fonts/[name].[hash].[ext]'
+        }
+      },
+      {
+        test: /\.(ttf|eot)$/,
+        loader: 'file',
+        query: {
+          name: 'fonts/[name].[hash].[ext]'
+        }
+      },
+      // Truffle solidity loader to watch for changes in Solitiy files and hot
+      // reload contracts with webpack.
+      //
+      // CURRENTLY REMOVED DUE TO INCOMPATIBILITY WITH TRUFFLE 3
+      // Compile and migrate contracts manually.
+      //
+      /*{
+        test: /\.sol$/,
+        loader: 'truffle-solidity?network_id=123'
+      }*/
+    ]
+  },
+
+  // We use PostCSS for autoprefixing only.
+  postcss: function() {
+    return [
+      autoprefixer({
+        browsers: [
+          '>1%',
+          'last 4 versions',
+          'Firefox ESR',
+          'not ie < 9', // React doesn't support IE8 anyway
+        ]
+      }),
+    ];
+  },
+  plugins: [
+    // Makes the public URL 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({
+      PUBLIC_URL: publicUrl
+    }),
+    // Generates an `index.html` file with the <script> injected.
+    new HtmlWebpackPlugin({
+      inject: true,
+      template: paths.appHtml,
+    }),
+    // Makes some environment variables available to the JS code, for example:
+    // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
+    new webpack.DefinePlugin(env),
+    // 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)
+  ],
+  // Some libraries import Node modules but don't use them in the browser.
+  // Tell Webpack to provide empty mocks for them so importing them works.
+  node: {
+    fs: 'empty',
+    net: 'empty',
+    tls: 'empty'
+  }
+};