created basic project structure

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Gym Tracker is a containerized web application for tracking gym sessions and muscle group training frequency. It displays a heatmap of workout sessions, tracks muscle group balance, and provides insights into training patterns.
+
+**Tech Stack:**
+- **Backend:** Node.js with Express (REST API)
+- **Database:** SQLite (file-based, for simplicity)
+- **Frontend:** Vanilla JavaScript (no build process)
+- **Deployment:** Docker container with Nginx reverse proxy
+
+## Commands
+
+### Backend Development
+```bash
+# Install dependencies
+cd backend && npm install
+
+# Start the backend server (port 3000)
+npm start
+```
+
+### Docker
+```bash
+# Build the Docker image
+docker build -t gym-tracker .
+
+# Run the container
+docker run -p 80:80 -p 3000:3000 -v $(pwd)/data:/app/data gym-tracker
+
+# Note: Volume mount for /app/data ensures SQLite database persists across restarts
+```
+
+## Architecture
+
+### Backend Structure
+- **`backend/server.js`**: Express server with REST API endpoints
+  - `GET /api/sessions` - Fetch all gym sessions
+  - `POST /api/sessions` - Create new session (requires date and muscle_groups array)
+  - `PUT /api/sessions/:id` - Update existing session
+  - `DELETE /api/sessions/:id` - Delete session
+- **`backend/database.js`**: SQLite database layer with schema and query functions
+- **Database schema**: Single `sessions` table with columns: `id` (TEXT), `date` (TEXT, ISO format), `muscle_groups` (TEXT, JSON array)
+
+### Frontend Structure
+- **`frontend/index.html`**: Main HTML structure
+- **`frontend/app.js`**: Core application logic and state management
+- **`frontend/api.js`**: API client for backend communication
+- **`frontend/styles.css`**: Application styling
+- **Frontend architecture**: Modular vanilla JS without build tools, served directly by Nginx
+
+### Muscle Groups
+The application tracks 6 muscle groups: Chest, Legs, Delts (shoulders), Lats (back), Triceps, Biceps
+
+### Balance Indicator Logic
+- **Happy**: All 6 muscle groups trained 2+ times in last 7 days
+- **Neutral**: All 6 muscle groups trained 1+ times in last 7 days
+- **Angry**: Any muscle group not trained in last 7 days
+
+### Docker Configuration
+- Single container runs both Nginx (frontend) and Express (backend)
+- Nginx serves static files and proxies `/api/*` requests to Express
+- SQLite database requires volume mount for persistence
+- Ports: 80 (Nginx/HTTP), 3000 (Express API)
+
+## Important Implementation Details
+
+### Date Format
+All dates are stored and transmitted in ISO 8601 format (YYYY-MM-DD) for consistency between frontend and backend.
+
+### Session IDs
+Sessions use UUID format for unique identification.
+
+### Muscle Groups Storage
+Muscle groups are stored as JSON-encoded arrays in the SQLite TEXT column, e.g., `["Chest", "Legs", "Delts"]`.
+
+### Heatmap Implementation
+Uses Cal-Heatmap library (loaded via CDN) to visualize workout frequency across the year.

PLAN.md

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+# Gym Tracker App - Implementation Plan
+
+## Overview
+
+This document outlines the step-by-step implementation plan for building the Gym Tracker application based on the Product Design Document. The application will be containerized using Docker and consist of a Node.js/Express backend with SQLite database, and a vanilla JavaScript frontend served by Nginx.
+
+## Project Structure
+
+```
+gym-tracker/
+├── backend/
+│   ├── server.js              # Express server and API routes
+│   ├── database.js            # SQLite database setup and queries
+│   ├── package.json           # Node.js dependencies
+│   └── package-lock.json
+├── frontend/
+│   ├── index.html             # Main HTML file
+│   ├── styles.css             # CSS styling
+│   ├── app.js                 # Main application logic
+│   ├── heatmap.js             # Heatmap component logic
+│   ├── muscleGroups.js        # Muscle group tracking logic
+│   └── api.js                 # API client for backend communication
+├── nginx/
+│   └── nginx.conf             # Nginx configuration
+├── Dockerfile                 # Docker container definition
+└── README.md                  # Setup and usage instructions
+```
+
+## Implementation Phases
+
+### Phase 1: Backend Setup
+
+#### Step 1.1: Initialize Node.js Backend
+- [ ] Create `backend/` directory
+- [ ] Initialize npm project (`npm init`)
+- [ ] Install dependencies:
+  - `express` - Web framework
+  - `sqlite3` - SQLite database driver
+  - `cors` - Enable CORS for API
+  - `body-parser` - Parse JSON request bodies
+  - `uuid` - Generate unique session IDs
+
+#### Step 1.2: Create Database Schema
+- [ ] Create `database.js` file
+- [ ] Define SQLite database initialization
+- [ ] Create `sessions` table with schema:
+  ```sql
+  CREATE TABLE IF NOT EXISTS sessions (
+    id TEXT PRIMARY KEY,
+    date TEXT NOT NULL,
+    muscle_groups TEXT NOT NULL
+  );
+  ```
+- [ ] Implement database connection management
+- [ ] Add error handling for database operations
+
+#### Step 1.3: Build API Endpoints
+- [ ] Create `server.js` with Express setup
+- [ ] Implement `GET /api/sessions` - Fetch all sessions
+- [ ] Implement `POST /api/sessions` - Create new session
+  - Validate date format
+  - Validate muscle_groups array
+  - Generate unique ID
+- [ ] Implement `PUT /api/sessions/:id` - Update session
+  - Validate session exists
+  - Validate input data
+- [ ] Implement `DELETE /api/sessions/:id` - Delete session
+- [ ] Add error handling and appropriate HTTP status codes
+- [ ] Enable CORS for frontend access
+
+#### Step 1.4: Test Backend API
+- [ ] Test each endpoint with curl or Postman
+- [ ] Verify data persistence in SQLite
+- [ ] Test edge cases (invalid data, missing sessions, etc.)
+
+### Phase 2: Frontend Development
+
+#### Step 2.1: HTML Structure
+- [ ] Create `frontend/index.html`
+- [ ] Define semantic HTML structure:
+  - Header with app title and balance indicator
+  - "Add Today's Workout" button
+  - Heatmap container
+  - Muscle groups dashboard (6 cards)
+  - Modal/form for adding sessions
+- [ ] Include CDN links for Cal-Heatmap
+- [ ] Link CSS and JS files
+
+#### Step 2.2: CSS Styling
+- [ ] Create `frontend/styles.css`
+- [ ] Style header and navigation
+- [ ] Style balance indicator (emoji + status text)
+- [ ] Style "Add Workout" button
+- [ ] Style heatmap container
+- [ ] Style muscle group cards:
+  - Color-coded indicators (green/yellow/red)
+  - Display days since last trained
+  - Display training counts
+- [ ] Style modal/form for session entry
+- [ ] Add responsive design for mobile devices
+- [ ] Implement color scheme and typography
+
+#### Step 2.3: API Client Layer
+- [ ] Create `frontend/api.js`
+- [ ] Implement `fetchSessions()` function
+- [ ] Implement `createSession(session)` function
+- [ ] Implement `updateSession(id, session)` function
+- [ ] Implement `deleteSession(id)` function
+- [ ] Add error handling for network requests
+- [ ] Add loading states
+
+#### Step 2.4: Core Application Logic
+- [ ] Create `frontend/app.js`
+- [ ] Initialize application state:
+  - Sessions array
+  - Muscle groups configuration
+- [ ] Implement session management:
+  - Load sessions on page load
+  - Add new session functionality
+  - Edit session functionality
+  - Delete session functionality
+- [ ] Implement data calculation functions:
+  - Calculate days since last trained per muscle group
+  - Calculate training frequency (7 days, 30 days)
+  - Calculate balance indicator score
+- [ ] Implement UI update functions:
+  - Update muscle group cards
+  - Update balance indicator
+  - Refresh heatmap
+
+#### Step 2.5: Heatmap Component
+- [ ] Create `frontend/heatmap.js`
+- [ ] Initialize Cal-Heatmap with configuration:
+  - Set date range (current year)
+  - Configure color scheme (green/grey)
+  - Set domain and subDomain
+- [ ] Transform sessions data for Cal-Heatmap format
+- [ ] Implement tooltip showing:
+  - Date
+  - Muscle groups trained
+- [ ] Add navigation controls (previous/next year)
+- [ ] Handle click events on heatmap cells
+
+#### Step 2.6: Muscle Groups Dashboard
+- [ ] Create `frontend/muscleGroups.js`
+- [ ] Define muscle groups configuration:
+  - Chest, Legs, Delts, Lats, Triceps, Biceps
+- [ ] Implement rendering of muscle group cards
+- [ ] Calculate and display for each muscle group:
+  - Days since last trained
+  - Training count (last 7 days / last 30 days)
+  - Color-coded status indicator
+- [ ] Update cards when sessions change
+
+#### Step 2.7: Balance Indicator
+- [ ] Implement balance score calculation logic:
+  - Happy: All 6 groups trained 2+ times in last 7 days
+  - Neutral: All 6 groups trained 1+ times in last 7 days
+  - Angry: Any group not trained in last 7 days
+- [ ] Render emoji and status text
+- [ ] Update indicator when sessions change
+
+#### Step 2.8: Session Form/Modal
+- [ ] Create modal UI for adding/editing sessions
+- [ ] Implement form with:
+  - Date picker (default: today)
+  - Checkboxes for 6 muscle groups
+  - Save button
+  - Cancel button
+- [ ] Handle form submission
+- [ ] Validate form inputs
+- [ ] Clear form after submission
+- [ ] Close modal after save
+
+### Phase 3: Docker Configuration
+
+#### Step 3.1: Create Dockerfile
+- [ ] Create `Dockerfile` in root directory
+- [ ] Use multi-stage build:
+  - Stage 1: Install Node.js dependencies
+  - Stage 2: Copy backend and frontend files
+  - Stage 3: Install and configure Nginx
+- [ ] Copy backend files to container
+- [ ] Copy frontend files to Nginx html directory
+- [ ] Expose ports (80 for Nginx, 3000 for Express)
+- [ ] Set up startup command to run both services
+
+#### Step 3.2: Configure Nginx
+- [ ] Create `nginx/nginx.conf`
+- [ ] Configure Nginx to:
+  - Serve static files from `/usr/share/nginx/html`
+  - Proxy `/api/*` requests to Express backend
+  - Set appropriate headers
+- [ ] Configure port 80 for HTTP
+
+#### Step 3.3: Test Docker Build
+- [ ] Build Docker image
+- [ ] Run container locally
+- [ ] Verify frontend loads correctly
+- [ ] Verify API endpoints work through Nginx proxy
+- [ ] Verify database persistence across container restarts
+- [ ] Test complete workflow (add/edit/delete sessions)
+
+### Phase 4: Integration and Testing
+
+#### Step 4.1: End-to-End Testing
+- [ ] Test adding multiple sessions
+- [ ] Test multiple sessions on same day
+- [ ] Test editing sessions
+- [ ] Test deleting sessions
+- [ ] Verify heatmap updates correctly
+- [ ] Verify muscle group stats update correctly
+- [ ] Verify balance indicator changes appropriately
+
+#### Step 4.2: Edge Case Testing
+- [ ] Test with empty database (first use)
+- [ ] Test with many sessions (performance)
+- [ ] Test date boundaries (year transitions)
+- [ ] Test all muscle groups selected
+- [ ] Test no muscle groups selected (validation)
+- [ ] Test invalid date inputs
+
+#### Step 4.3: UI/UX Polish
+- [ ] Review and improve styling
+- [ ] Add loading indicators
+- [ ] Add success/error messages
+- [ ] Improve mobile responsiveness
+- [ ] Test across different browsers
+- [ ] Optimize performance
+
+### Phase 5: Documentation and Deployment
+
+#### Step 5.1: Create README
+- [ ] Write `README.md` with:
+  - Project overview
+  - Prerequisites (Docker installed)
+  - Installation instructions
+  - Usage instructions
+  - Docker commands reference
+  - Backup recommendations
+  - Troubleshooting guide
+
+#### Step 5.2: Deployment Preparation
+- [ ] Document Docker build process
+- [ ] Document port configuration
+- [ ] Document volume mount for data persistence
+- [ ] Create startup scripts if needed
+- [ ] Document environment variables
+
+#### Step 5.3: Final Review
+- [ ] Code review and cleanup
+- [ ] Remove console.logs and debug code
+- [ ] Optimize bundle size
+- [ ] Verify all PRD requirements met
+- [ ] Test final Docker image
+
+## Development Order Recommendation
+
+**Recommended sequence for building:**
+
+1. **Backend First** (Phase 1)
+   - Build and test API independently
+   - Ensures data layer is solid before frontend
+
+2. **Frontend Core** (Phase 2.1-2.4)
+   - HTML structure and basic styling
+   - API client and core logic
+   - Can test with mock data initially
+
+3. **Frontend Components** (Phase 2.5-2.8)
+   - Heatmap integration
+   - Muscle groups dashboard
+   - Balance indicator
+   - Session form
+
+4. **Docker Integration** (Phase 3)
+   - Containerize application
+   - Configure Nginx proxy
+
+5. **Testing & Polish** (Phase 4-5)
+   - End-to-end testing
+   - Documentation
+   - Final deployment preparation
+
+## Key Technical Decisions
+
+### Database Design
+- **Single table:** Simple schema with JSON-encoded muscle_groups array
+- **Text IDs:** Using UUIDs for session identification
+- **Date format:** ISO 8601 string format (YYYY-MM-DD) for consistency
+
+### Frontend Architecture
+- **Modular files:** Separate concerns (app logic, heatmap, muscle groups, API)
+- **No build process:** Vanilla JS served directly
+- **Cal-Heatmap:** Mature library for heatmap visualization
+
+### Docker Strategy
+- **Single container:** Both Nginx and Express in one container for simplicity
+- **Volume mount:** Persistent data storage outside container
+- **Nginx proxy:** Clean separation of static and API requests
+
+## Success Criteria
+
+- ✅ Application runs in Docker container
+- ✅ All API endpoints function correctly
+- ✅ Heatmap displays gym sessions accurately
+- ✅ Muscle group tracking calculates correctly
+- ✅ Balance indicator shows appropriate status
+- ✅ Sessions can be added, edited, and deleted
+- ✅ Data persists across container restarts
+- ✅ UI is responsive and user-friendly
+- ✅ All PRD requirements implemented
+

backend/.gitignore

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+node_modules/

backend/database.js

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+const sqlite3 = require('sqlite3').verbose();
+const path = require('path');
+
+// Database file path
+const DB_PATH = path.join(__dirname, '../data/gym-tracker.db');
+
+// Initialize database connection
+const db = new sqlite3.Database(DB_PATH, (err) => {
+  if (err) {
+    console.error('Error opening database:', err.message);
+  } else {
+    console.log('Connected to SQLite database at', DB_PATH);
+    initializeDatabase();
+  }
+});
+
+// Create tables if they don't exist
+function initializeDatabase() {
+  const createTableSQL = `
+    CREATE TABLE IF NOT EXISTS sessions (
+      id TEXT PRIMARY KEY,
+      date TEXT NOT NULL,
+      muscle_groups TEXT NOT NULL
+    )
+  `;
+
+  db.run(createTableSQL, (err) => {
+    if (err) {
+      console.error('Error creating sessions table:', err.message);
+    } else {
+      console.log('Sessions table ready');
+    }
+  });
+}
+
+// Get all sessions
+function getAllSessions(callback) {
+  const sql = 'SELECT * FROM sessions ORDER BY date DESC';
+  db.all(sql, [], (err, rows) => {
+    if (err) {
+      callback(err, null);
+    } else {
+      // Parse muscle_groups JSON string back to array
+      const sessions = rows.map(row => ({
+        id: row.id,
+        date: row.date,
+        muscle_groups: JSON.parse(row.muscle_groups)
+      }));
+      callback(null, sessions);
+    }
+  });
+}
+
+// Get session by ID
+function getSessionById(id, callback) {
+  const sql = 'SELECT * FROM sessions WHERE id = ?';
+  db.get(sql, [id], (err, row) => {
+    if (err) {
+      callback(err, null);
+    } else if (!row) {
+      callback(null, null);
+    } else {
+      const session = {
+        id: row.id,
+        date: row.date,
+        muscle_groups: JSON.parse(row.muscle_groups)
+      };
+      callback(null, session);
+    }
+  });
+}
+
+// Create new session
+function createSession(id, date, muscleGroups, callback) {
+  const sql = 'INSERT INTO sessions (id, date, muscle_groups) VALUES (?, ?, ?)';
+  const muscleGroupsJSON = JSON.stringify(muscleGroups);
+
+  db.run(sql, [id, date, muscleGroupsJSON], function(err) {
+    if (err) {
+      callback(err);
+    } else {
+      callback(null, { id, date, muscle_groups: muscleGroups });
+    }
+  });
+}
+
+// Update existing session
+function updateSession(id, date, muscleGroups, callback) {
+  const sql = 'UPDATE sessions SET date = ?, muscle_groups = ? WHERE id = ?';
+  const muscleGroupsJSON = JSON.stringify(muscleGroups);
+
+  db.run(sql, [date, muscleGroupsJSON, id], function(err) {
+    if (err) {
+      callback(err);
+    } else if (this.changes === 0) {
+      callback(new Error('Session not found'));
+    } else {
+      callback(null, { id, date, muscle_groups: muscleGroups });
+    }
+  });
+}
+
+// Delete session
+function deleteSession(id, callback) {
+  const sql = 'DELETE FROM sessions WHERE id = ?';
+
+  db.run(sql, [id], function(err) {
+    if (err) {
+      callback(err);
+    } else if (this.changes === 0) {
+      callback(new Error('Session not found'));
+    } else {
+      callback(null);
+    }
+  });
+}
+
+// Close database connection
+function closeDatabase() {
+  db.close((err) => {
+    if (err) {
+      console.error('Error closing database:', err.message);
+    } else {
+      console.log('Database connection closed');
+    }
+  });
+}
+
+module.exports = {
+  getAllSessions,
+  getSessionById,
+  createSession,
+  updateSession,
+  deleteSession,
+  closeDatabase
+};

backend/package-lock.json

@@ -0,0 +1,842 @@
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+      }
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+      "license": "ISC"
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+}

backend/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "gym-tracker-back",
+  "version": "1.0.0",
+  "description": "Gym tracker application back-end",
+  "license": "ISC",
+  "author": "Roger Oriol",
+  "type": "commonjs",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^5.1.0"
+  }
+}

backend/server.js

@@ -0,0 +1,140 @@
+const express = require('express');
+const cors = require('cors');
+const { v4: uuidv4 } = require('uuid');
+const db = require('./database');
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+
+// Validation helpers
+function isValidDate(dateString) {
+  const regex = /^\d{4}-\d{2}-\d{2}$/;
+  if (!regex.test(dateString)) return false;
+  const date = new Date(dateString);
+  return date instanceof Date && !isNaN(date);
+}
+
+function isValidMuscleGroups(muscleGroups) {
+  if (!Array.isArray(muscleGroups) || muscleGroups.length === 0) {
+    return false;
+  }
+  const validGroups = ['Chest', 'Legs', 'Delts', 'Lats', 'Triceps', 'Biceps'];
+  return muscleGroups.every(group => validGroups.includes(group));
+}
+
+// API Routes
+
+// GET /api/sessions - Fetch all sessions
+app.get('/api/sessions', (req, res) => {
+  db.getAllSessions((err, sessions) => {
+    if (err) {
+      console.error('Error fetching sessions:', err);
+      return res.status(500).json({ error: 'Failed to fetch sessions' });
+    }
+    res.json(sessions);
+  });
+});
+
+// POST /api/sessions - Create new session
+app.post('/api/sessions', (req, res) => {
+  const { date, muscle_groups } = req.body;
+
+  // Validation
+  if (!date) {
+    return res.status(400).json({ error: 'Date is required' });
+  }
+  if (!isValidDate(date)) {
+    return res.status(400).json({ error: 'Invalid date format. Use YYYY-MM-DD' });
+  }
+  if (!muscle_groups) {
+    return res.status(400).json({ error: 'Muscle groups are required' });
+  }
+  if (!isValidMuscleGroups(muscle_groups)) {
+    return res.status(400).json({
+      error: 'Invalid muscle groups. Must be a non-empty array containing: Chest, Legs, Delts, Lats, Triceps, Biceps'
+    });
+  }
+
+  // Generate unique ID
+  const id = uuidv4();
+
+  // Create session
+  db.createSession(id, date, muscle_groups, (err, session) => {
+    if (err) {
+      console.error('Error creating session:', err);
+      return res.status(500).json({ error: 'Failed to create session' });
+    }
+    res.status(201).json(session);
+  });
+});
+
+// PUT /api/sessions/:id - Update session
+app.put('/api/sessions/:id', (req, res) => {
+  const { id } = req.params;
+  const { date, muscle_groups } = req.body;
+
+  // Validation
+  if (!date) {
+    return res.status(400).json({ error: 'Date is required' });
+  }
+  if (!isValidDate(date)) {
+    return res.status(400).json({ error: 'Invalid date format. Use YYYY-MM-DD' });
+  }
+  if (!muscle_groups) {
+    return res.status(400).json({ error: 'Muscle groups are required' });
+  }
+  if (!isValidMuscleGroups(muscle_groups)) {
+    return res.status(400).json({
+      error: 'Invalid muscle groups. Must be a non-empty array containing: Chest, Legs, Delts, Lats, Triceps, Biceps'
+    });
+  }
+
+  // Update session
+  db.updateSession(id, date, muscle_groups, (err, session) => {
+    if (err) {
+      if (err.message === 'Session not found') {
+        return res.status(404).json({ error: 'Session not found' });
+      }
+      console.error('Error updating session:', err);
+      return res.status(500).json({ error: 'Failed to update session' });
+    }
+    res.json(session);
+  });
+});
+
+// DELETE /api/sessions/:id - Delete session
+app.delete('/api/sessions/:id', (req, res) => {
+  const { id } = req.params;
+
+  db.deleteSession(id, (err) => {
+    if (err) {
+      if (err.message === 'Session not found') {
+        return res.status(404).json({ error: 'Session not found' });
+      }
+      console.error('Error deleting session:', err);
+      return res.status(500).json({ error: 'Failed to delete session' });
+    }
+    res.status(204).send();
+  });
+});
+
+// Health check endpoint
+app.get('/health', (req, res) => {
+  res.json({ status: 'ok' });
+});
+
+// Start server
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});
+
+// Graceful shutdown
+process.on('SIGINT', () => {
+  console.log('\nShutting down gracefully...');
+  db.closeDatabase();
+  process.exit(0);
+});

frontend/index.html

@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="utf-8">
+  <title>Gym tracker</title>
+  <base href="/">
+  <meta name="viewport"
+    content="viewport-fit=cover, width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=5.0">
+  <meta name="description" content="">
+  <meta name="keywords" content="">
+  <meta name="author" content="">
+  <meta name="application-name" content="">
+  <meta name="theme-color" content="#33d">
+  <meta name="color-scheme" content="light dark">
+  <meta property="og:title" content="" />
+  <meta property="og:type" content="website" />
+  <meta property="og:url" content="" />
+  <meta property="og:image" content="" />
+  <link rel="canonical" href="" />
+  <link rel="manifest" href="manifest.json">
+
+  <link rel="preload"
+    href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap"
+    as="style" onload="this.onload=null;this.rel='stylesheet'">
+  <link rel="preconnect" href="https://fonts.gstatic.com">
+
+  <style>
+    body {
+      background: #fefefe;
+      color: #222;
+      font-family: 'Roboto', sans-serif;
+      padding: 1rem;
+      line-height: 1.8;
+    }
+  </style>
+  <link rel="preload" href="styles.css" as="style" onload="this.onload=null;this.rel='stylesheet'">
+  <noscript>
+    <link rel="stylesheet" href="styles.css">
+  </noscript>
+
+  <script>
+    if ('serviceWorker' in navigator) {
+      window.addEventListener('load', () => {
+        navigator.serviceWorker.register('/service-worker.js');
+      });
+    }
+  </script>
+
+  <script type="module" src="app.js"></script>
+
+<body>
+
+</body>
+
+</html>