29. Juni 2024, 13:18

.dockerignore

@@ -0,0 +1,7 @@
+
+backend/node_modules
+frontend/node_modules
+.vscode
+.idea
+.DS_Store
+	

.vscode/launch.json

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+
+	{
+		"version": "0.2.0",
+		"configurations": [
+			{
+				"name": "[Compound] Debug Frontend without Backend",
+				"type": "chrome",
+				"request": "launch",
+				"url": "http://localhost:3000",
+				"webRoot": "${workspaceFolder}/frontend/src",
+				"preLaunchTask": "Start Frontend",
+				"postDebugTask": "Terminate All Tasks",
+				"sourceMaps": true,
+				"skipFiles": ["node_modules/**"],
+				"runtimeExecutable": "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
+				"presentation": {
+					"hidden": true
+				}
+			},
+			{
+				"type": "node",
+				"request": "launch",
+				"name": "Debug Jest Tests",
+				"program": "${workspaceRoot}/backend/node_modules/jest/bin/jest",
+				"args": ["--runInBand"],
+				"cwd": "${workspaceRoot}/backend",
+				"console": "integratedTerminal",
+				"internalConsoleOptions": "neverOpen"
+			},
+			{
+				"type": "node",
+				"request": "launch",
+				"name": "Debug Backend",
+				"skipFiles": ["<node_internals>/**", "node_modules/**"],
+				"cwd": "${workspaceFolder}/backend",
+				"internalConsoleOptions": "openOnSessionStart",
+				"env": {
+					"LOCAL_MODE": "true"
+				},
+				"args": [
+					"node_modules/ts-node/dist/bin.js",
+					"--project",
+					"${workspaceFolder}/backend/tsconfig.json",
+					"-r",
+					"tsconfig-paths/register",
+					"src/index.ts"
+				],
+				"runtimeArgs": ["-r", "ts-node/register", "--unhandled-rejections=strict", "--nolazy"],
+				"program": "${workspaceFolder}/backend/src/index.ts",
+				"preLaunchTask": "Install Backend Dependencies"
+			},
+			{
+				"name": "Debug Frontend",
+				"type": "chrome",
+				"request": "launch",
+				"url": "http://localhost:3000",
+				"webRoot": "${workspaceFolder}/frontend/src",
+				"preLaunchTask": "only Frontend",
+				"postDebugTask": "Terminate All Tasks",
+				"sourceMaps": true,
+				"skipFiles": ["node_modules/**"],
+				"runtimeExecutable": "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
+			}
+		],
+		"compounds": [
+			{
+				"name": "Debug Frontend and Backend",
+				"configurations": ["Debug Backend", "[Compound] Debug Frontend without Backend"]
+			}
+		]
+	}
+	

.vscode/tasks.json

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+
+	{
+		"version": "2.0.0",
+		"tasks": [
+			{
+				"label": "Kill3000",
+				"type": "shell",
+				"windows": {
+					"command": "netstat -ano | findstr :3000 | for /F \"tokens=5\" %%a in ('more') do taskkill /PID %%a /F"
+				},
+				"linux": {
+					"command": "fuser -k 3000/tcp"
+				},
+				"osx": {
+					"command": "lsof -ti:3000 | xargs kill"
+				},
+				"presentation": {
+					"reveal": "always",
+					"panel": "new"
+				},
+				"problemMatcher": []
+			},
+			{
+				"label": "Kill8800",
+				"type": "shell",
+				"windows": {
+					"command": "netstat -ano | findstr :8800 | for /F \"tokens=5\" %%a in ('more') do taskkill /PID %%a /F"
+				},
+				"linux": {
+					"command": "fuser -k 8800/tcp"
+				},
+				"osx": {
+					"command": "lsof -ti:8800 | xargs kill"
+				},
+				"presentation": {
+					"reveal": "always",
+					"panel": "new"
+				},
+				"problemMatcher": []
+			},
+			{
+				"label": "Install Backend Dependencies",
+				"type": "shell",
+				"command": "npm install",
+				"options": {
+					"cwd": "${workspaceFolder}/backend"
+				}
+			},
+			{
+				"label": "Start Backend",
+				"type": "shell",
+				"command": "npx ts-node src/index.ts",
+				"options": {
+					"cwd": "${workspaceFolder}/backend"
+				},
+				"isBackground": true,
+				"problemMatcher": {
+					"owner": "typescript",
+					"pattern": {
+						"regexp": "^.*$",
+						"file": 1,
+						"location": 2,
+						"message": 3
+					},
+					"background": {
+						"activeOnStart": true,
+						"beginsPattern": "^.*$",
+						"endsPattern": "^Port.*$"
+					}
+				}
+			},
+			{
+				"label": "Start Frontend",
+				"type": "shell",
+				"command": "npm start",
+				"options": {
+					"cwd": "${workspaceFolder}/frontend"
+				},
+				"isBackground": true,
+				"problemMatcher": {
+					"owner": "javascript",
+					"pattern": {
+						"regexp": "^.*$",
+						"file": 1,
+						"location": 2,
+						"message": 3
+					},
+					"background": {
+						"activeOnStart": true,
+						"beginsPattern": "^.*$",
+						"endsPattern": "start.*$"
+					}
+				}
+			},
+			{
+				"type": "shell",
+				"label": "Docker Build",
+				"command": "docker build --build-arg NODE_VERSION=$(node -v) -t ${workspaceFolderBasename} .",
+				"group": "build"
+			},
+			{
+				"label": "Terminate All Tasks",
+				"command": "echo ${input:terminate}",
+				"type": "shell",
+				"problemMatcher": []
+			},
+			{
+				"label": "only Frontend",
+				"type": "shell",
+				"command": "npm start",
+				"dependsOn": ["Start Backend"],
+				"options": {
+					"cwd": "${workspaceFolder}/frontend"
+				},
+				"isBackground": true,
+				"problemMatcher": {
+					"owner": "javascript",
+					"pattern": {
+						"regexp": "^.*$",
+						"file": 1,
+						"location": 2,
+						"message": 3
+					},
+					"background": {
+						"activeOnStart": true,
+						"beginsPattern": "^.*$",
+						"endsPattern": "start.*$"
+					}
+				}
+			}
+		],
+		"inputs": [
+			{
+				"id": "terminate",
+				"type": "command",
+				"command": "workbench.action.tasks.terminate",
+				"args": "terminateAll"
+			}
+		]
+	}
+	

Dockerfile

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+
+	# Build-Phase für das Frontend
+FROM node:latest AS frontend-build
+WORKDIR /app
+COPY ./frontend ./frontend
+WORKDIR /app/frontend
+RUN npm install
+RUN npm run build
+
+# Build-Phase für das Backend
+FROM node:latest AS backend-build
+WORKDIR /usr/src/app
+COPY ./backend ./backend
+WORKDIR /usr/src/app/backend
+RUN npm install -g typescript
+RUN npm install
+RUN tsc
+
+# Produktionsphase
+FROM node:latest
+WORKDIR /usr/src/app
+
+# Kopieren des React-Builds
+COPY --from=frontend-build /app/frontend/build /var/www/html
+
+# Backend-Quelldateien und kompilierte JavaScript-Dateien kopieren
+COPY --from=backend-build /usr/src/app/backend /usr/src/app/backend
+
+# Nginx installieren
+RUN apt-get update && apt-get install -y nginx
+
+# Standard Nginx-Konfiguration überschreiben, falls notwendig
+RUN echo 'server { \
+    listen 80; \
+    root /var/www/html; \
+    index index.html index.htm; \
+    location /sw.js { \
+        add_header Cache-Control "no-cache"; \
+        proxy_cache_bypass $http_pragma; \
+        proxy_cache_revalidate on; \
+        expires off; \
+        access_log off; \
+    } \
+    location / { \
+        try_files $uri $uri/ /index.html; \
+    } \
+    location /api { \
+        proxy_pass http://127.0.0.1:8800; \
+        proxy_set_header Host $http_host; \
+        proxy_set_header X-Real-IP $remote_addr; \
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; \
+        proxy_set_header X-Forwarded-Proto $scheme; \
+        proxy_redirect off; \
+    } \
+}' > /etc/nginx/sites-enabled/default
+
+EXPOSE 80
+
+# Startkommando
+CMD sh -c "nginx -g 'daemon off;' & node backend/dist/index.js"
+	

backend/package.json

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+{
+  "dependencies": {
+    "@types/dotenv": "^8.2.0",
+    "@types/express": "^4.17.21",
+    "dotenv": "^16.4.5",
+    "express": "^4.19.2"
+  },
+  "devDependencies": {
+    "nodemon": "^3.1.4",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.5.2"
+  }
+}

backend/src/config.ts

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+{
+	// config.js
+import path from 'path';
+import fs from 'fs';
+
+const localDirectoryPath = path.resolve(__dirname, 'local');
+if (!fs.existsSync(localDirectoryPath)) {
+  fs.mkdirSync(localDirectoryPath, { recursive: true });
+  console.log('Local directory created.');
+}
+
+
+export default {
+  localDirectoryPath,
+};
+}

backend/src/index.ts

@@ -0,0 +1,23 @@
+import config from './config';
+	import express from 'express';
+	import dotenv from 'dotenv';
+	
+	dotenv.config();
+	const app = express();
+	
+	const NODE_ENV = process.env.NODE_ENV || 'dev';
+	const Port = NODE_ENV === "production" ? parseInt(process.env.PORT || '') || 8800 : 8800;
+	
+	// Middleware für JSON-Parsing
+	app.use(express.json());
+	
+	// API-Endpunkte
+	app.get('/api/hello', (req, res) => {
+	res.json({ message: 'Hello from the backend!' });
+	});
+	
+	// Weitere API-Endpunkte können hier hinzugefügt werden
+	
+	app.listen(Port, () => {
+	console.log(`Server läuft auf Port ${Port}`);
+	});

backend/tsconfig.json

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+{
+		"compilerOptions": {
+			"target": "es6",
+			"module": "commonjs",
+			"strict": true,
+			"esModuleInterop": true,
+			"skipLibCheck": true,
+			"forceConsistentCasingInFileNames": true,
+			"outDir": "./dist",
+			"rootDir": "./src"
+		},
+		"include": ["src/**/*"],
+		"exclude": ["node_modules", "dist"]
+	}

docker-compose.yml

@@ -0,0 +1,23 @@
+
+version: "3.3"
+services:
+ test:
+  image : test_container
+  container_name: test_container
+  restart: unless-stopped
+  volumes:
+     - ./local:/usr/src/app/backend/dist/local
+  networks:
+   - Backend
+  labels:
+   - "traefik.enable=true"
+   - "traefik.http.routers.test.rule=Host(`test.csnetworkx.dev`)"
+   - "traefik.http.routers.test.entrypoints=websecure,publicwebsecure"
+   - "traefik.http.services.test.loadbalancer.server.port=80"
+   - "traefik.http.routers.test.service=test"
+   - "traefik.http.routers.test.tls.certresolver=myresolver"
+
+networks:
+  Backend:
+   external: true
+   

frontend/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# 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*

frontend/package.json

@@ -1,5 +1,57 @@
 {
+  "browserslist": {
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ],
+    "production": [
+      "\u003e0.2%",
+      "not dead",
+      "not op_mini all"
+    ]
+  },
+  "dependencies": {
+    "@testing-library/jest-dom": "^5.17.0",
+    "@testing-library/react": "^13.4.0",
+    "@testing-library/user-event": "^13.5.0",
+    "@types/jest": "^27.5.2",
+    "@types/node": "^17.0.45",
+    "@types/react": "^18.3.3",
+    "@types/react-dom": "^18.3.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-scripts": "5.0.1",
+    "typescript": "^4.9.5",
+    "web-vitals": "^2.1.4",
+    "workbox-background-sync": "^6.6.0",
+    "workbox-broadcast-update": "^6.6.0",
+    "workbox-cacheable-response": "^6.6.0",
+    "workbox-core": "^6.6.0",
+    "workbox-expiration": "^6.6.0",
+    "workbox-google-analytics": "^6.6.1",
+    "workbox-navigation-preload": "^6.6.0",
+    "workbox-precaching": "^6.6.0",
+    "workbox-range-requests": "^6.6.0",
+    "workbox-routing": "^6.6.0",
+    "workbox-strategies": "^6.6.0",
+    "workbox-streams": "^6.6.0"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
   "name": "frontend",
-  "version": "0.1.0",
+  "port": 3000,
-  "private": true
+  "private": true,
+  "proxy": "http://localhost:8800",
+  "scripts": {
+    "build": "react-scripts build",
+    "eject": "react-scripts eject",
+    "start": "BROWSER=None react-scripts start",
+    "test": "react-scripts test"
+  },
+  "version": "0.1.0"
 }

frontend/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta name="description" content="Web site created using create-react-app" />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      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>

frontend/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

frontend/public/robots.txt

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+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

frontend/src/App.css

@@ -0,0 +1,38 @@
+.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);
+  }
+}

frontend/src/App.test.tsx

@@ -0,0 +1,9 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

frontend/src/App.tsx

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+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.tsx</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;

frontend/src/index.css

@@ -0,0 +1,13 @@
+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;
+}

frontend/src/index.tsx

@@ -0,0 +1,25 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import './index.css';
+import App from './App';
+import * as serviceWorkerRegistration from './serviceWorkerRegistration';
+import reportWebVitals from './reportWebVitals';
+
+const root = ReactDOM.createRoot(
+  document.getElementById('root') as HTMLElement
+);
+root.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);
+
+// 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://cra.link/PWA
+serviceWorkerRegistration.unregister();
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

frontend/src/logo.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
+    <g fill="#61DAFB">
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frontend/src/react-app-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="react-scripts" />

frontend/src/reportWebVitals.ts

@@ -0,0 +1,15 @@
+import { ReportHandler } from 'web-vitals';
+
+const reportWebVitals = (onPerfEntry?: ReportHandler) => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

frontend/src/service-worker.ts

@@ -0,0 +1,80 @@
+/// <reference lib="webworker" />
+/* eslint-disable no-restricted-globals */
+
+// This service worker can be customized!
+// See https://developers.google.com/web/tools/workbox/modules
+// for the list of available Workbox modules, or add any other
+// code you'd like.
+// You can also remove this file if you'd prefer not to use a
+// service worker, and the Workbox build step will be skipped.
+
+import { clientsClaim } from 'workbox-core';
+import { ExpirationPlugin } from 'workbox-expiration';
+import { precacheAndRoute, createHandlerBoundToURL } from 'workbox-precaching';
+import { registerRoute } from 'workbox-routing';
+import { StaleWhileRevalidate } from 'workbox-strategies';
+
+declare const self: ServiceWorkerGlobalScope;
+
+clientsClaim();
+
+// Precache all of the assets generated by your build process.
+// Their URLs are injected into the manifest variable below.
+// This variable must be present somewhere in your service worker file,
+// even if you decide not to use precaching. See https://cra.link/PWA
+precacheAndRoute(self.__WB_MANIFEST);
+
+// Set up App Shell-style routing, so that all navigation requests
+// are fulfilled with your index.html shell. Learn more at
+// https://developers.google.com/web/fundamentals/architecture/app-shell
+const fileExtensionRegexp = new RegExp('/[^/?]+\\.[^/]+$');
+registerRoute(
+  // Return false to exempt requests from being fulfilled by index.html.
+  ({ request, url }: { request: Request; url: URL }) => {
+    // If this isn't a navigation, skip.
+    if (request.mode !== 'navigate') {
+      return false;
+    }
+
+    // If this is a URL that starts with /_, skip.
+    if (url.pathname.startsWith('/_')) {
+      return false;
+    }
+
+    // If this looks like a URL for a resource, because it contains
+    // a file extension, skip.
+    if (url.pathname.match(fileExtensionRegexp)) {
+      return false;
+    }
+
+    // Return true to signal that we want to use the handler.
+    return true;
+  },
+  createHandlerBoundToURL(process.env.PUBLIC_URL + '/index.html')
+);
+
+// An example runtime caching route for requests that aren't handled by the
+// precache, in this case same-origin .png requests like those from in public/
+registerRoute(
+  // Add in any other file extensions or routing criteria as needed.
+  ({ url }) => url.origin === self.location.origin && url.pathname.endsWith('.png'),
+  // Customize this strategy as needed, e.g., by changing to CacheFirst.
+  new StaleWhileRevalidate({
+    cacheName: 'images',
+    plugins: [
+      // Ensure that once this runtime cache reaches a maximum size the
+      // least-recently used images are removed.
+      new ExpirationPlugin({ maxEntries: 50 }),
+    ],
+  })
+);
+
+// This allows the web app to trigger skipWaiting via
+// registration.waiting.postMessage({type: 'SKIP_WAITING'})
+self.addEventListener('message', (event) => {
+  if (event.data && event.data.type === 'SKIP_WAITING') {
+    self.skipWaiting();
+  }
+});
+
+// Any other custom service worker logic can go here.

frontend/src/serviceWorkerRegistration.ts

@@ -0,0 +1,142 @@
+// 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://cra.link/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}$/)
+);
+
+type Config = {
+  onSuccess?: (registration: ServiceWorkerRegistration) => void;
+  onUpdate?: (registration: ServiceWorkerRegistration) => void;
+};
+
+export function register(config?: Config) {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${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://cra.link/PWA'
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl: string, config?: 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://cra.link/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: string, config?: 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);
+      });
+  }
+}

frontend/src/setupTests.ts

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';

frontend/tsconfig.json

@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "noFallthroughCasesInSwitch": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx"
+  },
+  "include": [
+    "src"
+  ]
+}

package.json

@@ -1,7 +1,7 @@
 {
   "name": "templateprojekt",
   "version": "1.0.0",
-  "description": "",
+  "description": "## Projektübersicht",
   "keywords": [],
   "author": "Christian Schindler",
   "license": "ISC",