diff --git a/client/react-native/mobile/android/app/build.gradle b/client/react-native/mobile/android/app/build.gradle
index 5a39bbb62a..7245426e1a 100644
--- a/client/react-native/mobile/android/app/build.gradle
+++ b/client/react-native/mobile/android/app/build.gradle
@@ -96,7 +96,6 @@ def enableProguardInReleaseBuilds = false
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         applicationId "com.berty"
diff --git a/client/react-native/mobile/android/build.gradle b/client/react-native/mobile/android/build.gradle
index 07ec1ca0f5..9bfe06d2ee 100644
--- a/client/react-native/mobile/android/build.gradle
+++ b/client/react-native/mobile/android/build.gradle
@@ -37,9 +37,8 @@ allprojects {
 }
 
 ext {
-    buildToolsVersion = "26.0.3"
     minSdkVersion = 16
-    compileSdkVersion = 26
-    targetSdkVersion = 26
-    supportLibVersion = "26.1.0"
+    compileSdkVersion = 27
+    targetSdkVersion = 27
+    supportLibVersion = "27.1.1"
 }
diff --git a/client/react-native/mobile/android/gradle.properties b/client/react-native/mobile/android/gradle.properties
index 1fd964e90b..f00d01d742 100644
--- a/client/react-native/mobile/android/gradle.properties
+++ b/client/react-native/mobile/android/gradle.properties
@@ -18,3 +18,4 @@
 # org.gradle.parallel=true
 
 android.useDeprecatedNdk=true
+org.gradle.configureondemand=true
diff --git a/client/react-native/web/config/webpack.config.prod.js b/client/react-native/web/config/webpack.config.prod.js
index b2d0685dd0..5f70c03d73 100644
--- a/client/react-native/web/config/webpack.config.prod.js
+++ b/client/react-native/web/config/webpack.config.prod.js
@@ -2,24 +2,21 @@ const autoprefixer = require('autoprefixer')
 const path = require('path')
 const webpack = require('webpack')
 const HtmlWebpackPlugin = require('html-webpack-plugin')
-const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
-const MiniCssExtractPlugin = require('mini-css-extract-plugin')
-const OptimizeCSSAssetsPlugin = require('optimize-css-assets-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 getCSSModuleLocalIdent = require('react-dev-utils/getCSSModuleLocalIdent')
 const paths = require('./paths')
 const getClientEnvironment = require('./env')
-const fs = require('fs')
-const babelrc = JSON.parse(
-  fs.readFileSync(path.resolve(__dirname, '../../.babelrc'))
-)
 
 // 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
@@ -35,55 +32,21 @@ if (env.stringified['process.env'].NODE_ENV !== '"production"') {
   throw new Error('Production builds must have NODE_ENV=production.')
 }
 
-// style files regexes
-const cssRegex = /\.css$/
-const cssModuleRegex = /\.module\.css$/
-const sassRegex = /\.(scss|sass)$/
-const sassModuleRegex = /\.module\.(scss|sass)$/
+// Note: defined here because it will be used more than once.
+const cssFilename = 'static/css/[name].[contenthash:8].css'
 
-// common function to get style loaders
-const getStyleLoaders = (cssOptions, preProcessor) => {
-  const loaders = [
-    MiniCssExtractPlugin.loader,
-    {
-      loader: require.resolve('css-loader'),
-      options: cssOptions,
-    },
-    {
-      // Options for PostCSS as we reference these options twice
-      // Adds vendor prefixing based on your specified browser support in
-      // package.json
-      loader: require.resolve('postcss-loader'),
-      options: {
-        // Necessary for external CSS imports to work
-        // https://github.com/facebook/create-react-app/issues/2677
-        ident: 'postcss',
-        plugins: () => [
-          require('postcss-flexbugs-fixes'),
-          autoprefixer({
-            flexbox: 'no-2009',
-          }),
-        ],
-        sourceMap: shouldUseSourceMap,
-      },
-    },
-  ]
-  if (preProcessor) {
-    loaders.push({
-      loader: require.resolve(preProcessor),
-      options: {
-        sourceMap: shouldUseSourceMap,
-      },
-    })
-  }
-  return loaders
-}
+// 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
+  ? { publicPath: Array(cssFilename.split('/').length).join('../') } // Making sure that the publicPath goes back to to build folder.
+  : {}
 
 // 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 = {
-  mode: 'production',
   // Don't attempt to continue if there are any errors.
   bail: true,
   // We generate sourcemaps in production. This is slow but gives good results.
@@ -107,71 +70,19 @@ module.exports = {
         .relative(paths.appSrc, info.absoluteResourcePath)
         .replace(/\\/g, '/'),
   },
-  optimization: {
-    minimizer: [
-      new UglifyJsPlugin({
-        uglifyOptions: {
-          parse: {
-            // we want uglify-js to parse ecma 8 code. However, we don't want it
-            // to apply any minfication steps that turns valid ecma 5 code
-            // into invalid ecma 5 code. This is why the 'compress' and 'output'
-            // sections only apply transformations that are ecma 5 safe
-            // https://github.com/facebook/create-react-app/pull/4234
-            ecma: 8,
-          },
-          compress: {
-            ecma: 5,
-            warnings: false,
-            // Disabled because of an issue with Uglify breaking seemingly valid code:
-            // https://github.com/facebook/create-react-app/issues/2376
-            // Pending further investigation:
-            // https://github.com/mishoo/UglifyJS2/issues/2011
-            comparisons: false,
-          },
-          mangle: {
-            safari10: true,
-          },
-          output: {
-            ecma: 5,
-            comments: false,
-            // Turned on because emoji and regex is not minified properly using default
-            // https://github.com/facebook/create-react-app/issues/2488
-            ascii_only: true,
-          },
-        },
-        // Use multi-process parallel running to improve the build speed
-        // Default number of concurrent runs: os.cpus().length - 1
-        parallel: true,
-        // Enable file caching
-        cache: true,
-        sourceMap: shouldUseSourceMap,
-      }),
-      new OptimizeCSSAssetsPlugin(),
-    ],
-    // Automatically split vendor and commons
-    // https://twitter.com/wSokra/status/969633336732905474
-    // https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
-    splitChunks: {
-      chunks: 'all',
-      name: 'vendors',
-    },
-    // Keep the runtime chunk seperated to enable long term caching
-    // https://twitter.com/wSokra/status/969679223278505985
-    runtimeChunk: true,
-  },
   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/facebook/create-react-app/issues/253
-    modules: ['node_modules'].concat(
+    // 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/facebook/create-react-app/issues/290
+    // 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'],
@@ -192,8 +103,9 @@ module.exports = {
   module: {
     strictExportPresence: true,
     rules: [
-      // Disable require.ensure as it's not a standard language feature.
-      { parser: { requireEnsure: false } },
+      // 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.
@@ -202,13 +114,15 @@ module.exports = {
         enforce: 'pre',
         use: [
           {
+            options: {
+              formatter: eslintFormatter,
+              eslintPath: require.resolve('eslint'),
+            },
             loader: require.resolve('eslint-loader'),
           },
         ],
-        include: paths.srcPaths,
-        exclude: [/[/\\\\]node_modules[/\\\\]/],
+        include: paths.appSrc,
       },
-
       {
         // "oneOf" will traverse all following loaders until one will
         // match the requirements. When no loader matches it will fall
@@ -224,111 +138,87 @@ module.exports = {
               name: 'static/media/[name].[hash:8].[ext]',
             },
           },
-          {
-            test: /\.ttf$/,
-            loader: 'url-loader', // or directly file-loader
-            include: require.resolve('react-native-vector-icons'),
-          },
-          // Process application JS with Babel.
-          // The preset includes JSX, Flow, and some ESnext features.
+          // Process JS with Babel.
           {
             test: /\.(js|jsx|mjs)$/,
-            include: paths.srcPaths,
+            include: paths.appSrc,
             exclude: [/[/\\\\]node_modules[/\\\\]/],
-            use: [
-              // This loader parallelizes code compilation, it is optional but
-              // improves compile time on larger projects
-              require.resolve('thread-loader'),
-              {
-                loader: require.resolve('babel-loader'),
-                options: {
-                  compact: true,
-                  highlightCode: true,
-                  ...babelrc,
-                },
-              },
-            ],
+            loader: require.resolve('babel-loader'),
+            options: {
+              compact: true,
+            },
           },
           // Process any JS outside of the app with Babel.
           // Unlike the application JS, we only compile the standard ES features.
           {
             test: /\.js$/,
-            use: [
-              // This loader parallelizes code compilation, it is optional but
-              // improves compile time on larger projects
-              require.resolve('thread-loader'),
-              {
-                loader: require.resolve('babel-loader'),
-                options: {
-                  babelrc: false,
-                  compact: false,
-                  presets: [
-                    require.resolve('babel-preset-react-app/dependencies'),
-                  ],
-                  cacheDirectory: true,
-                  highlightCode: true,
-                },
-              },
-            ],
+            loader: require.resolve('babel-loader'),
+            options: {
+              babelrc: false,
+              compact: false,
+              presets: [require.resolve('babel-preset-react-app')],
+              cacheDirectory: true,
+              highlightCode: 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.
-          // `MiniCSSExtractPlugin` extracts styles into CSS
-          // files. If you use code splitting, async bundles will have their own separate CSS chunk file.
-          // By default we support CSS Modules with the extension .module.css
-          {
-            test: cssRegex,
-            exclude: cssModuleRegex,
-            loader: getStyleLoaders({
-              importLoaders: 1,
-              sourceMap: shouldUseSourceMap,
-            }),
-          },
-          // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
-          // using the extension .module.css
-          {
-            test: cssModuleRegex,
-            loader: getStyleLoaders({
-              importLoaders: 1,
-              sourceMap: shouldUseSourceMap,
-              modules: true,
-              getLocalIdent: getCSSModuleLocalIdent,
-            }),
-          },
-          // Opt-in support for SASS. The logic here is somewhat similar
-          // as in the CSS routine, except that "sass-loader" runs first
-          // to compile SASS files into CSS.
-          // By default we support SASS Modules with the
-          // extensions .module.scss or .module.sass
+          // "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: sassRegex,
-            exclude: sassModuleRegex,
-            loader: getStyleLoaders(
-              {
-                importLoaders: 2,
-                sourceMap: shouldUseSourceMap,
-              },
-              'sass-loader'
-            ),
-          },
-          // Adds support for CSS Modules, but using SASS
-          // using the extension .module.scss or .module.sass
-          {
-            test: sassModuleRegex,
-            loader: getStyleLoaders(
-              {
-                importLoaders: 2,
-                sourceMap: shouldUseSourceMap,
-                modules: true,
-                getLocalIdent: getCSSModuleLocalIdent,
-              },
-              'sass-loader'
+            test: /\.css$/,
+            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('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
+              )
             ),
-          },
-          // The GraphQL loader preprocesses GraphQL queries in .graphql files.
-          {
-            test: /\.(graphql)$/,
-            loader: 'graphql-tag/loader',
+            // Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
           },
           // "file" loader makes sure assets end up in the `build` folder.
           // When you `import` an asset, you get its filename.
@@ -337,7 +227,7 @@ module.exports = {
           {
             loader: require.resolve('file-loader'),
             // Exclude `js` files to keep "css" loader working as it injects
-            // it's runtime that would otherwise be processed through "file" loader.
+            // it's runtime that would otherwise processed through "file" loader.
             // Also exclude `html` and `json` extensions so they get processed
             // by webpacks internal loaders.
             exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
@@ -352,6 +242,12 @@ module.exports = {
     ],
   },
   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,
@@ -369,29 +265,41 @@ module.exports = {
         minifyURLs: true,
       },
     }),
-    // Makes some environment variables available in index.html.
-    // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
-    // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
-    // In production, it will be an empty string unless you specify "homepage"
-    // in `package.json`, in which case it will be the pathname of that URL.
-    new InterpolateHtmlPlugin(env.raw),
     // Makes some environment variables available to the JS code, for example:
     // if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
     // It is absolutely essential that NODE_ENV was set to production here.
     // Otherwise React will be compiled in the very slow development mode.
     new webpack.DefinePlugin(env.stringified),
-    new MiniCssExtractPlugin({
-      // Options similar to the same options in webpackOptions.output
-      // both options are optional
-      filename: 'static/css/[name].[contenthash:8].css',
-      chunkFilename: 'static/css/[name].[contenthash:8].chunk.css',
+    // 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',
-      publicPath: publicPath,
     }),
     // Generate a service worker script that will precache, and keep up to date,
     // the HTML & assets that are part of the Webpack build.
@@ -409,18 +317,19 @@ module.exports = {
         }
         if (message.indexOf('Skipping static resource') === 0) {
           // This message obscures real errors so we ignore it.
-          // https://github.com/facebook/create-react-app/issues/2612
+          // 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$/, /asset-manifest\.json$/],
-      // `navigateFallback` and `navigateFallbackWhitelist` are disabled by default; see
-      // https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#service-worker-considerations
-      // navigateFallback: publicUrl + '/index.html',
-      // navigateFallbackWhitelist: [/^(?!\/__).*/],
     }),
     // 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
@@ -438,7 +347,4 @@ module.exports = {
     tls: 'empty',
     child_process: 'empty',
   },
-  // Turn off performance processing because we utilize
-  // our own hints via the FileSizeReporter
-  performance: false,
 }
diff --git a/client/react-native/web/config/webpack.config.prod.js.backup b/client/react-native/web/config/webpack.config.prod.js.backup
new file mode 100644
index 0000000000..b2d0685dd0
--- /dev/null
+++ b/client/react-native/web/config/webpack.config.prod.js.backup
@@ -0,0 +1,444 @@
+const autoprefixer = require('autoprefixer')
+const path = require('path')
+const webpack = require('webpack')
+const HtmlWebpackPlugin = require('html-webpack-plugin')
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
+const MiniCssExtractPlugin = require('mini-css-extract-plugin')
+const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')
+const ManifestPlugin = require('webpack-manifest-plugin')
+const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin')
+const SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin')
+const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin')
+const getCSSModuleLocalIdent = require('react-dev-utils/getCSSModuleLocalIdent')
+const paths = require('./paths')
+const getClientEnvironment = require('./env')
+const fs = require('fs')
+const babelrc = JSON.parse(
+  fs.readFileSync(path.resolve(__dirname, '../../.babelrc'))
+)
+
+// 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
+// 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.')
+}
+
+// style files regexes
+const cssRegex = /\.css$/
+const cssModuleRegex = /\.module\.css$/
+const sassRegex = /\.(scss|sass)$/
+const sassModuleRegex = /\.module\.(scss|sass)$/
+
+// common function to get style loaders
+const getStyleLoaders = (cssOptions, preProcessor) => {
+  const loaders = [
+    MiniCssExtractPlugin.loader,
+    {
+      loader: require.resolve('css-loader'),
+      options: cssOptions,
+    },
+    {
+      // Options for PostCSS as we reference these options twice
+      // Adds vendor prefixing based on your specified browser support in
+      // package.json
+      loader: require.resolve('postcss-loader'),
+      options: {
+        // Necessary for external CSS imports to work
+        // https://github.com/facebook/create-react-app/issues/2677
+        ident: 'postcss',
+        plugins: () => [
+          require('postcss-flexbugs-fixes'),
+          autoprefixer({
+            flexbox: 'no-2009',
+          }),
+        ],
+        sourceMap: shouldUseSourceMap,
+      },
+    },
+  ]
+  if (preProcessor) {
+    loaders.push({
+      loader: require.resolve(preProcessor),
+      options: {
+        sourceMap: shouldUseSourceMap,
+      },
+    })
+  }
+  return loaders
+}
+
+// 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 = {
+  mode: 'production',
+  // 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, '/'),
+  },
+  optimization: {
+    minimizer: [
+      new UglifyJsPlugin({
+        uglifyOptions: {
+          parse: {
+            // we want uglify-js to parse ecma 8 code. However, we don't want it
+            // to apply any minfication steps that turns valid ecma 5 code
+            // into invalid ecma 5 code. This is why the 'compress' and 'output'
+            // sections only apply transformations that are ecma 5 safe
+            // https://github.com/facebook/create-react-app/pull/4234
+            ecma: 8,
+          },
+          compress: {
+            ecma: 5,
+            warnings: false,
+            // Disabled because of an issue with Uglify breaking seemingly valid code:
+            // https://github.com/facebook/create-react-app/issues/2376
+            // Pending further investigation:
+            // https://github.com/mishoo/UglifyJS2/issues/2011
+            comparisons: false,
+          },
+          mangle: {
+            safari10: true,
+          },
+          output: {
+            ecma: 5,
+            comments: false,
+            // Turned on because emoji and regex is not minified properly using default
+            // https://github.com/facebook/create-react-app/issues/2488
+            ascii_only: true,
+          },
+        },
+        // Use multi-process parallel running to improve the build speed
+        // Default number of concurrent runs: os.cpus().length - 1
+        parallel: true,
+        // Enable file caching
+        cache: true,
+        sourceMap: shouldUseSourceMap,
+      }),
+      new OptimizeCSSAssetsPlugin(),
+    ],
+    // Automatically split vendor and commons
+    // https://twitter.com/wSokra/status/969633336732905474
+    // https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
+    splitChunks: {
+      chunks: 'all',
+      name: 'vendors',
+    },
+    // Keep the runtime chunk seperated to enable long term caching
+    // https://twitter.com/wSokra/status/969679223278505985
+    runtimeChunk: true,
+  },
+  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/facebook/create-react-app/issues/253
+    modules: ['node_modules'].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/facebook/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: [
+      // Disable require.ensure as it's not a standard language feature.
+      { parser: { requireEnsure: false } },
+
+      // First, run the linter.
+      // It's important to do this before Babel processes the JS.
+      {
+        test: /\.(js|jsx|mjs)$/,
+        enforce: 'pre',
+        use: [
+          {
+            loader: require.resolve('eslint-loader'),
+          },
+        ],
+        include: paths.srcPaths,
+        exclude: [/[/\\\\]node_modules[/\\\\]/],
+      },
+
+      {
+        // "oneOf" will traverse all following loaders until one will
+        // match the requirements. When no loader matches it will fall
+        // back to the "file" loader at the end of the loader list.
+        oneOf: [
+          // "url" loader works just like "file" loader but it also embeds
+          // assets smaller than specified size as data URLs to avoid requests.
+          {
+            test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
+            loader: require.resolve('url-loader'),
+            options: {
+              limit: 10000,
+              name: 'static/media/[name].[hash:8].[ext]',
+            },
+          },
+          {
+            test: /\.ttf$/,
+            loader: 'url-loader', // or directly file-loader
+            include: require.resolve('react-native-vector-icons'),
+          },
+          // Process application JS with Babel.
+          // The preset includes JSX, Flow, and some ESnext features.
+          {
+            test: /\.(js|jsx|mjs)$/,
+            include: paths.srcPaths,
+            exclude: [/[/\\\\]node_modules[/\\\\]/],
+            use: [
+              // This loader parallelizes code compilation, it is optional but
+              // improves compile time on larger projects
+              require.resolve('thread-loader'),
+              {
+                loader: require.resolve('babel-loader'),
+                options: {
+                  compact: true,
+                  highlightCode: true,
+                  ...babelrc,
+                },
+              },
+            ],
+          },
+          // Process any JS outside of the app with Babel.
+          // Unlike the application JS, we only compile the standard ES features.
+          {
+            test: /\.js$/,
+            use: [
+              // This loader parallelizes code compilation, it is optional but
+              // improves compile time on larger projects
+              require.resolve('thread-loader'),
+              {
+                loader: require.resolve('babel-loader'),
+                options: {
+                  babelrc: false,
+                  compact: false,
+                  presets: [
+                    require.resolve('babel-preset-react-app/dependencies'),
+                  ],
+                  cacheDirectory: true,
+                  highlightCode: true,
+                },
+              },
+            ],
+          },
+          // "postcss" loader applies autoprefixer to our CSS.
+          // "css" loader resolves paths in CSS and adds assets as dependencies.
+          // `MiniCSSExtractPlugin` extracts styles into CSS
+          // files. If you use code splitting, async bundles will have their own separate CSS chunk file.
+          // By default we support CSS Modules with the extension .module.css
+          {
+            test: cssRegex,
+            exclude: cssModuleRegex,
+            loader: getStyleLoaders({
+              importLoaders: 1,
+              sourceMap: shouldUseSourceMap,
+            }),
+          },
+          // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
+          // using the extension .module.css
+          {
+            test: cssModuleRegex,
+            loader: getStyleLoaders({
+              importLoaders: 1,
+              sourceMap: shouldUseSourceMap,
+              modules: true,
+              getLocalIdent: getCSSModuleLocalIdent,
+            }),
+          },
+          // Opt-in support for SASS. The logic here is somewhat similar
+          // as in the CSS routine, except that "sass-loader" runs first
+          // to compile SASS files into CSS.
+          // By default we support SASS Modules with the
+          // extensions .module.scss or .module.sass
+          {
+            test: sassRegex,
+            exclude: sassModuleRegex,
+            loader: getStyleLoaders(
+              {
+                importLoaders: 2,
+                sourceMap: shouldUseSourceMap,
+              },
+              'sass-loader'
+            ),
+          },
+          // Adds support for CSS Modules, but using SASS
+          // using the extension .module.scss or .module.sass
+          {
+            test: sassModuleRegex,
+            loader: getStyleLoaders(
+              {
+                importLoaders: 2,
+                sourceMap: shouldUseSourceMap,
+                modules: true,
+                getLocalIdent: getCSSModuleLocalIdent,
+              },
+              'sass-loader'
+            ),
+          },
+          // The GraphQL loader preprocesses GraphQL queries in .graphql files.
+          {
+            test: /\.(graphql)$/,
+            loader: 'graphql-tag/loader',
+          },
+          // "file" loader makes sure assets end up in the `build` folder.
+          // When you `import` an asset, you get its filename.
+          // This loader doesn't use a "test" so it will catch all modules
+          // that fall through the other loaders.
+          {
+            loader: require.resolve('file-loader'),
+            // Exclude `js` files to keep "css" loader working as it injects
+            // it's runtime that would otherwise be processed through "file" loader.
+            // Also exclude `html` and `json` extensions so they get processed
+            // by webpacks internal loaders.
+            exclude: [/\.(js|jsx|mjs)$/, /\.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: [
+    // 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 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),
+    // 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),
+    new MiniCssExtractPlugin({
+      // Options similar to the same options in webpackOptions.output
+      // both options are optional
+      filename: 'static/css/[name].[contenthash:8].css',
+      chunkFilename: 'static/css/[name].[contenthash:8].chunk.css',
+    }),
+    // 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',
+      publicPath: publicPath,
+    }),
+    // 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/facebook/create-react-app/issues/2612
+          return
+        }
+        console.log(message)
+      },
+      minify: true,
+      // Don't precache sourcemaps (they're large) and build asset manifest:
+      staticFileGlobsIgnorePatterns: [/\.map$/, /asset-manifest\.json$/],
+      // `navigateFallback` and `navigateFallbackWhitelist` are disabled by default; see
+      // https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#service-worker-considerations
+      // navigateFallback: publicUrl + '/index.html',
+      // navigateFallbackWhitelist: [/^(?!\/__).*/],
+    }),
+    // 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',
+  },
+  // Turn off performance processing because we utilize
+  // our own hints via the FileSizeReporter
+  performance: false,
+}