diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 2b8002e..f6561ca 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,9 +1,169 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="9b17c4a1-b7df-4634-9e4b-b92fbf098d8e" name="Default Changelist" comment="">
+      <change afterPath="$PROJECT_DIR$/.idea/compiler.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/inspectionProfiles/Project_Default.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/config-overrides.js" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/ui/footer/index.js" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/views/App.js" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/views/App.scss" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/package.json" beforeDir="false" afterPath="$PROJECT_DIR$/package.json" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/App.css" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/App.js" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/App.test.js" beforeDir="false" afterPath="$PROJECT_DIR$/src/views/App.test.js" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/index.css" beforeDir="false" afterPath="$PROJECT_DIR$/src/assets/scss/_index.scss" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/index.js" beforeDir="false" afterPath="$PROJECT_DIR$/src/index.js" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/logo.svg" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/serviceWorker.js" beforeDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
   <component name="ProjectId" id="1ZHj6OwWVdRxDV76xlrrwhiUEN9" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showExcludedFiles" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
   <component name="PropertiesComponent">
     <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
+    <property name="SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
     <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="last_opened_file_path" value="$USER_HOME$/Desktop/WOW/x_cloud" />
+    <property name="node.js.detected.package.eslint" value="true" />
+    <property name="node.js.detected.package.standard" value="true" />
+    <property name="node.js.path.for.package.eslint" value="project" />
+    <property name="node.js.path.for.package.standard" value="project" />
+    <property name="node.js.selected.package.eslint" value="(autodetect)" />
+    <property name="node.js.selected.package.standard" value="" />
     <property name="nodejs_interpreter_path" value="node" />
+    <property name="nodejs_package_manager_path" value="yarn" />
+    <property name="ts.external.directory.path" value="D:\app\WebStorm 2019.3.3\plugins\JavaScriptLanguage\jsLanguageServicesImpl\external" />
+  </component>
+  <component name="RecentsManager">
+    <key name="MoveFile.RECENT_KEYS">
+      <recent name="D:\code\@react\forfun-jsx\src\ui\footer" />
+      <recent name="D:\code\@react\forfun-jsx\src\views" />
+      <recent name="D:\code\@react\forfun-jsx\src\assets\scss" />
+      <recent name="D:\code\@react\forfun-jsx\src" />
+      <recent name="D:\code\@react\forfun-jsx\src\App" />
+    </key>
+  </component>
+  <component name="RunManager" selected="npm.npm start">
+    <configuration name="Debug Application" type="JavascriptDebugType" uri="http://localhost:3000">
+      <method v="2" />
+    </configuration>
+    <configuration name="build" type="js.build_tools.npm" temporary="true" nameIsGenerated="true">
+      <package-json value="$PROJECT_DIR$/package.json" />
+      <command value="run" />
+      <scripts>
+        <script value="build" />
+      </scripts>
+      <node-interpreter value="project" />
+      <envs />
+      <method v="2" />
+    </configuration>
+    <configuration name="npm start" type="js.build_tools.npm">
+      <package-json value="$PROJECT_DIR$/package.json" />
+      <command value="run" />
+      <scripts>
+        <script value="start" />
+      </scripts>
+      <node-interpreter value="project" />
+      <envs />
+      <method v="2" />
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="npm.build" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="9b17c4a1-b7df-4634-9e4b-b92fbf098d8e" name="Default Changelist" comment="" />
+      <created>1584502737137</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1584502737137</updated>
+      <workItem from="1584502738517" duration="1945000" />
+      <workItem from="1584509783574" duration="12093000" />
+      <workItem from="1584540546619" duration="3629000" />
+      <workItem from="1584583504865" duration="4213000" />
+      <workItem from="1584683880034" duration="19000" />
+      <workItem from="1584683931540" duration="5492000" />
+      <workItem from="1584707519054" duration="1358000" />
+      <workItem from="1584709894981" duration="629000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+  <component name="WindowStateProjectService">
+    <state x="552" y="186" key="#ESLint" timestamp="1584543157816">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state x="552" y="186" key="#ESLint/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584543157816" />
+    <state x="521" y="122" key="CommitChangelistDialog2" timestamp="1584710870649">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state x="521" y="122" key="CommitChangelistDialog2/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584710870649" />
+    <state x="740" y="282" key="FileChooserDialogImpl" timestamp="1584708875464">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state x="740" y="282" key="FileChooserDialogImpl/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584708875464" />
+    <state width="948" height="134" key="GridCell.Tab.0.bottom" timestamp="1584708877870">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state width="948" height="134" key="GridCell.Tab.0.bottom/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584708877870" />
+    <state width="948" height="134" key="GridCell.Tab.0.bottom/0.0.1920.1050/1920.-252.2048.1122@0.0.1920.1050" timestamp="1584699038654" />
+    <state width="1899" height="134" key="GridCell.Tab.0.bottom/0.0.1920.1050@0.0.1920.1050" timestamp="1584605051750" />
+    <state width="948" height="134" key="GridCell.Tab.0.center" timestamp="1584708877870">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state width="948" height="134" key="GridCell.Tab.0.center/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584708877870" />
+    <state width="948" height="134" key="GridCell.Tab.0.center/0.0.1920.1050/1920.-252.2048.1122@0.0.1920.1050" timestamp="1584699038654" />
+    <state width="1899" height="134" key="GridCell.Tab.0.center/0.0.1920.1050@0.0.1920.1050" timestamp="1584605051750" />
+    <state width="948" height="134" key="GridCell.Tab.0.left" timestamp="1584708877870">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state width="948" height="134" key="GridCell.Tab.0.left/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584708877870" />
+    <state width="948" height="134" key="GridCell.Tab.0.left/0.0.1920.1050/1920.-252.2048.1122@0.0.1920.1050" timestamp="1584699038654" />
+    <state width="1899" height="134" key="GridCell.Tab.0.left/0.0.1920.1050@0.0.1920.1050" timestamp="1584605051750" />
+    <state width="948" height="134" key="GridCell.Tab.0.right" timestamp="1584708877870">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state width="948" height="134" key="GridCell.Tab.0.right/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584708877870" />
+    <state width="948" height="134" key="GridCell.Tab.0.right/0.0.1920.1050/1920.-252.2048.1122@0.0.1920.1050" timestamp="1584699038654" />
+    <state width="1899" height="134" key="GridCell.Tab.0.right/0.0.1920.1050@0.0.1920.1050" timestamp="1584605051750" />
+    <state x="702" y="231" key="VCS.ChangeListViewerDialog" timestamp="1584710886583">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state x="702" y="231" key="VCS.ChangeListViewerDialog/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584710886583" />
+    <state x="652" y="352" key="com.intellij.ide.util.TipDialog" timestamp="1584683945424">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state x="652" y="352" key="com.intellij.ide.util.TipDialog/0.0.1920.1050/1920.-252.2048.1122@0.0.1920.1050" timestamp="1584683945424" />
+    <state x="771" y="430" key="git4idea.ui.GitResetDialog" timestamp="1584710900642">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state x="771" y="430" key="git4idea.ui.GitResetDialog/0.0.1920.1050/-1025.-2160.2560.1409@0.0.1920.1050" timestamp="1584710900642" />
+    <state x="143" y="233" width="672" height="678" key="search.everywhere.popup" timestamp="1584521888619">
+      <screen x="0" y="0" width="1920" height="1050" />
+    </state>
+    <state x="143" y="233" width="672" height="678" key="search.everywhere.popup/0.0.1920.1050/1920.-252.2048.1122@0.0.1920.1050" timestamp="1584521888619" />
   </component>
 </project>
\ No newline at end of file
diff --git a/package.json b/package.json
index 9e707a9..d436796 100644
--- a/package.json
+++ b/package.json
@@ -6,14 +6,17 @@
     "@testing-library/jest-dom": "^4.2.4",
     "@testing-library/react": "^9.3.2",
     "@testing-library/user-event": "^7.1.2",
+    "antd": "latest",
     "react": "^16.13.0",
     "react-dom": "^16.13.0",
-    "react-scripts": "3.4.0"
+    "react-scripts": "3.4.0",
+    "redux": "^4.0.5",
+    "react-redux": "latest"
   },
   "scripts": {
-    "start": "react-scripts start",
-    "build": "react-scripts build",
-    "test": "react-scripts test",
+    "start": "react-app-rewired start",
+    "build": "react-app-rewired build",
+    "test": "react-app-rewired test",
     "eject": "react-scripts eject"
   },
   "eslintConfig": {
@@ -30,5 +33,12 @@
       "last 1 firefox version",
       "last 1 safari version"
     ]
+  },
+  "devDependencies": {
+    "customize-cra": "^0.9.1",
+    "node-sass": "^4.13.1",
+    "react-app-rewired": "^2.1.5",
+    "redux-devtools": "^3.5.0",
+    "sass-loader": "^8.0.2"
   }
 }
diff --git a/src/App.css b/src/App.css
deleted file mode 100644
index 74b5e05..0000000
--- a/src/App.css
+++ /dev/null
@@ -1,38 +0,0 @@
-.App {
-  text-align: center;
-}
-
-.App-logo {
-  height: 40vmin;
-  pointer-events: none;
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  .App-logo {
-    animation: App-logo-spin infinite 20s linear;
-  }
-}
-
-.App-header {
-  background-color: #282c34;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  font-size: calc(10px + 2vmin);
-  color: white;
-}
-
-.App-link {
-  color: #61dafb;
-}
-
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}
diff --git a/src/App.js b/src/App.js
deleted file mode 100644
index ce9cbd2..0000000
--- a/src/App.js
+++ /dev/null
@@ -1,26 +0,0 @@
-import React from 'react';
-import logo from './logo.svg';
-import './App.css';
-
-function App() {
-  return (
-    <div className="App">
-      <header className="App-header">
-        <img src={logo} className="App-logo" alt="logo" />
-        <p>
-          Edit <code>src/App.js</code> and save to reload.
-        </p>
-        <a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a>
-      </header>
-    </div>
-  );
-}
-
-export default App;
diff --git a/src/App.test.js b/src/App.test.js
deleted file mode 100644
index 4db7ebc..0000000
--- a/src/App.test.js
+++ /dev/null
@@ -1,9 +0,0 @@
-import React from 'react';
-import { render } from '@testing-library/react';
-import App from './App';
-
-test('renders learn react link', () => {
-  const { getByText } = render(<App />);
-  const linkElement = getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
-});
diff --git a/src/index.css b/src/index.css
deleted file mode 100644
index ec2585e..0000000
--- a/src/index.css
+++ /dev/null
@@ -1,13 +0,0 @@
-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
-}
diff --git a/src/index.js b/src/index.js
index 87d1be5..58f853b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,12 +1,8 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
-import App from './App';
-import * as serviceWorker from './serviceWorker';
+import App from '@/views/App.js';
 
-ReactDOM.render(<App />, document.getElementById('root'));
+ReactDOM.render(
+    <App />,
+    document.getElementById('root'));
 
-// If you want your app to work offline and load faster, you can change
-// unregister() to register() below. Note this comes with some pitfalls.
-// Learn more about service workers: https://bit.ly/CRA-PWA
-serviceWorker.unregister();
diff --git a/src/logo.svg b/src/logo.svg
deleted file mode 100644
index 6b60c10..0000000
--- a/src/logo.svg
+++ /dev/null
@@ -1,7 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
-    <g fill="#61DAFB">
-        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
-        <circle cx="420.9" cy="296.5" r="45.7"/>
-        <path d="M520.5 78.1z"/>
-    </g>
-</svg>
diff --git a/src/serviceWorker.js b/src/serviceWorker.js
deleted file mode 100644
index c4838eb..0000000
--- a/src/serviceWorker.js
+++ /dev/null
@@ -1,141 +0,0 @@
-// This optional code is used to register a service worker.
-// register() is not called by default.
-
-// 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 subsequent visits to a page, after all the
-// existing tabs open on the page have been closed, since previously cached
-// resources are updated in the background.
-
-// To learn more about the benefits of this model and instructions on how to
-// opt-in, read https://bit.ly/CRA-PWA
-
-const isLocalhost = Boolean(
-  window.location.hostname === 'localhost' ||
-    // [::1] is the IPv6 localhost address.
-    window.location.hostname === '[::1]' ||
-    // 127.0.0.0/8 are considered localhost for IPv4.
-    window.location.hostname.match(
-      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
-    )
-);
-
-export function register(config) {
-  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
-    // The URL constructor is available in all browsers that support SW.
-    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
-    if (publicUrl.origin !== window.location.origin) {
-      // Our service worker won't work if PUBLIC_URL is on a different origin
-      // from what our page is served on. This might happen if a CDN is used to
-      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
-      return;
-    }
-
-    window.addEventListener('load', () => {
-      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
-
-      if (isLocalhost) {
-        // This is running on localhost. Let's check if a service worker still exists or not.
-        checkValidServiceWorker(swUrl, config);
-
-        // Add some additional logging to localhost, pointing developers to the
-        // service worker/PWA documentation.
-        navigator.serviceWorker.ready.then(() => {
-          console.log(
-            'This web app is being served cache-first by a service ' +
-              'worker. To learn more, visit https://bit.ly/CRA-PWA'
-          );
-        });
-      } else {
-        // Is not localhost. Just register service worker
-        registerValidSW(swUrl, config);
-      }
-    });
-  }
-}
-
-function registerValidSW(swUrl, config) {
-  navigator.serviceWorker
-    .register(swUrl)
-    .then(registration => {
-      registration.onupdatefound = () => {
-        const installingWorker = registration.installing;
-        if (installingWorker == null) {
-          return;
-        }
-        installingWorker.onstatechange = () => {
-          if (installingWorker.state === 'installed') {
-            if (navigator.serviceWorker.controller) {
-              // At this point, the updated precached content has been fetched,
-              // but the previous service worker will still serve the older
-              // content until all client tabs are closed.
-              console.log(
-                'New content is available and will be used when all ' +
-                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
-              );
-
-              // Execute callback
-              if (config && config.onUpdate) {
-                config.onUpdate(registration);
-              }
-            } 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.');
-
-              // Execute callback
-              if (config && config.onSuccess) {
-                config.onSuccess(registration);
-              }
-            }
-          }
-        };
-      };
-    })
-    .catch(error => {
-      console.error('Error during service worker registration:', error);
-    });
-}
-
-function checkValidServiceWorker(swUrl, config) {
-  // Check if the service worker can be found. If it can't reload the page.
-  fetch(swUrl, {
-    headers: { 'Service-Worker': 'script' }
-  })
-    .then(response => {
-      // Ensure service worker exists, and that we really are getting a JS file.
-      const contentType = response.headers.get('content-type');
-      if (
-        response.status === 404 ||
-        (contentType != null && contentType.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, config);
-      }
-    })
-    .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();
-      })
-      .catch(error => {
-        console.error(error.message);
-      });
-  }
-}