📘 MobX with TypeScript: Observable State

🎯 Introduction

Welcome to the exciting world of MobX with TypeScript! 🎉 In this guide, we’ll explore how to create reactive, observable state that makes your applications come alive with automatic updates.

You’ll discover how MobX can transform your TypeScript development experience by making state management simple, predictable, and incredibly powerful. Whether you’re building web applications 🌐, desktop apps 🖥️, or complex data-driven interfaces 📊, understanding MobX observables is essential for creating responsive, maintainable code.

By the end of this tutorial, you’ll feel confident creating observable state that automatically updates your UI whenever data changes! Let’s dive in! 🏊‍♂️

📚 Understanding MobX Observable State

🤔 What is MobX Observable State?

MobX observable state is like having a smart assistant 🤖 that watches your data and automatically notifies everyone who cares when something changes. Think of it as a subscription service 📡 for your data - components subscribe to state changes and get updates instantly!

In TypeScript terms, MobX transforms your regular objects and values into reactive data structures ✨. This means you can:

✨ Automatic UI updates when data changes
🚀 Simple, intuitive state management
🛡️ Type-safe reactive programming
🔄 Minimal boilerplate code

💡 Why Use MobX with TypeScript?

Here’s why developers love MobX observables:

Type Safety 🔒: TypeScript ensures your observable state is properly typed
Better IDE Support 💻: Autocomplete and refactoring for reactive code
Automatic Derivations 📖: Computed values update automatically
Simple Mental Model 🔧: State changes trigger reactions naturally

Real-world example: Imagine building a shopping cart 🛒. With MobX observables, when you add an item, the cart total, item count, and UI all update automatically!

🔧 Basic Syntax and Usage

📝 Setting Up MobX

First, let’s install MobX with TypeScript support:

# 📦 Install MobX and TypeScript support
npm install mobx
npm install --save-dev @types/node

Enable decorators in your tsconfig.json:

{
  "compilerOptions": {
    "experimentalDecorators": true,
    "useDefineForClassFields": false
  }
}

🎨 Creating Your First Observable

Let’s start with a friendly example:

import { makeObservable, observable, action } from 'mobx';

// 🎯 Simple observable counter
class Counter {
  count = 0; // 📊 Our observable value

  constructor() {
    // 🎨 Make this object observable
    makeObservable(this, {
      count: observable,
      increment: action,
      decrement: action
    });
  }

  // ⬆️ Action to increase count
  increment = (): void => {
    this.count += 1;
    console.log(`Count is now: ${this.count} 🎉`);
  };

  // ⬇️ Action to decrease count
  decrement = (): void => {
    this.count -= 1;
    console.log(`Count is now: ${this.count} 📉`);
  };
}

// 🎮 Let's use it!
const counter = new Counter();
counter.increment(); // Count is now: 1 🎉
counter.increment(); // Count is now: 2 🎉

💡 Explanation: The makeObservable call tells MobX which properties to watch and which methods can modify state!

🎯 Observable Arrays and Objects

Here are patterns you’ll use daily:

import { makeObservable, observable, action, computed } from 'mobx';

// 🏗️ Observable todo list
class TodoStore {
  todos: string[] = []; // 📝 Observable array

  constructor() {
    makeObservable(this, {
      todos: observable,
      addTodo: action,
      removeTodo: action,
      todoCount: computed
    });
  }

  // ➕ Add a new todo
  addTodo = (text: string): void => {
    this.todos.push(`${text} ✨`);
  };

  // 🗑️ Remove a todo
  removeTodo = (index: number): void => {
    this.todos.splice(index, 1);
  };

  // 📊 Computed value - automatically updates!
  get todoCount(): number {
    return this.todos.length;
  }
}

💡 Practical Examples

🛒 Example 1: Shopping Cart Store

Let’s build something real and useful:

import { makeObservable, observable, action, computed } from 'mobx';

// 🛍️ Define our product type
interface Product {
  id: string;
  name: string;
  price: number;
  emoji: string; // Every product needs an emoji! 
}

// 🛒 Cart item with quantity
interface CartItem extends Product {
  quantity: number;
}

// 🏪 Shopping cart store
class ShoppingCartStore {
  items: CartItem[] = []; // 📦 Observable array of cart items
  isLoading = false; // ⏳ Loading state
  
  constructor() {
    makeObservable(this, {
      items: observable,
      isLoading: observable,
      addItem: action,
      removeItem: action,
      updateQuantity: action,
      clear: action,
      totalPrice: computed,
      totalItems: computed,
      isEmpty: computed
    });
  }
  
  // ➕ Add item to cart
  addItem = (product: Product): void => {
    const existingItem = this.items.find(item => item.id === product.id);
    
    if (existingItem) {
      // 📈 Increase quantity if item exists
      existingItem.quantity += 1;
    } else {
      // 🆕 Add new item
      this.items.push({ ...product, quantity: 1 });
    }
    
    console.log(`Added ${product.emoji} ${product.name} to cart! 🛒`);
  };
  
  // 🗑️ Remove item completely
  removeItem = (productId: string): void => {
    const index = this.items.findIndex(item => item.id === productId);
    if (index !== -1) {
      const item = this.items[index];
      this.items.splice(index, 1);
      console.log(`Removed ${item.emoji} ${item.name} from cart! 👋`);
    }
  };
  
  // 🔢 Update item quantity
  updateQuantity = (productId: string, quantity: number): void => {
    const item = this.items.find(item => item.id === productId);
    if (item) {
      if (quantity <= 0) {
        this.removeItem(productId);
      } else {
        item.quantity = quantity;
      }
    }
  };
  
  // 🧹 Clear entire cart
  clear = (): void => {
    this.items = [];
    console.log('Cart cleared! 🧹');
  };
  
  // 💰 Computed: Total price (automatically updates!)
  get totalPrice(): number {
    return this.items.reduce((sum, item) => 
      sum + (item.price * item.quantity), 0
    );
  }
  
  // 📊 Computed: Total items count
  get totalItems(): number {
    return this.items.reduce((sum, item) => sum + item.quantity, 0);
  }
  
  // ❓ Computed: Is cart empty?
  get isEmpty(): boolean {
    return this.items.length === 0;
  }
  
  // 📋 Display cart contents
  displayCart = (): void => {
    console.log("🛒 Your cart contains:");
    this.items.forEach(item => {
      console.log(`  ${item.emoji} ${item.name} x${item.quantity} - $${(item.price * item.quantity).toFixed(2)}`);
    });
    console.log(`💰 Total: $${this.totalPrice.toFixed(2)} (${this.totalItems} items)`);
  };
}

// 🎮 Let's use it!
const cart = new ShoppingCartStore();

// Add some products
cart.addItem({ 
  id: "1", 
  name: "TypeScript Book", 
  price: 29.99, 
  emoji: "📘" 
});

cart.addItem({ 
  id: "2", 
  name: "Coffee Mug", 
  price: 12.99, 
  emoji: "☕" 
});

cart.addItem({ 
  id: "1", 
  name: "TypeScript Book", 
  price: 29.99, 
  emoji: "📘" 
}); // This will increase quantity!

cart.displayCart();
// 🛒 Your cart contains:
//   📘 TypeScript Book x2 - $59.98
//   ☕ Coffee Mug x1 - $12.99
// 💰 Total: $72.97 (3 items)

🎯 Try it yourself: Add a discount feature and watch the total price update automatically!

🎮 Example 2: Game State Manager

Let’s make it fun with a game:

import { makeObservable, observable, action, computed } from 'mobx';

// 🏆 Player stats interface
interface PlayerStats {
  name: string;
  level: number;
  experience: number;
  health: number;
  maxHealth: number;
  coins: number;
  achievements: string[];
}

// 🎮 Game state manager
class GameStore {
  // 👤 Player state
  player: PlayerStats = {
    name: "Hero",
    level: 1,
    experience: 0,
    health: 100,
    maxHealth: 100,
    coins: 0,
    achievements: ["🌟 New Adventurer"]
  };
  
  // 🏃‍♂️ Game state
  isPlaying = false;
  currentQuest = "";
  enemies: string[] = [];
  
  constructor() {
    makeObservable(this, {
      player: observable,
      isPlaying: observable,
      currentQuest: observable,
      enemies: observable,
      startGame: action,
      gainExperience: action,
      takeDamage: action,
      heal: action,
      earnCoins: action,
      addAchievement: action,
      levelUp: action,
      experienceToNextLevel: computed,
      healthPercentage: computed,
      isAlive: computed
    });
  }
  
  // 🎮 Start the game
  startGame = (playerName: string): void => {
    this.player.name = playerName;
    this.isPlaying = true;
    this.currentQuest = "🗡️ Defeat the goblin!";
    console.log(`🎉 Welcome ${playerName}! Your adventure begins!`);
  };
  
  // ⭐ Gain experience points
  gainExperience = (xp: number): void => {
    this.player.experience += xp;
    console.log(`✨ Gained ${xp} XP! Total: ${this.player.experience}`);
    
    // 📈 Check for level up
    while (this.player.experience >= this.experienceToNextLevel) {
      this.levelUp();
    }
  };
  
  // 💔 Take damage
  takeDamage = (damage: number): void => {
    const actualDamage = Math.min(damage, this.player.health);
    this.player.health -= actualDamage;
    console.log(`💥 Took ${actualDamage} damage! Health: ${this.player.health}/${this.player.maxHealth}`);
    
    if (!this.isAlive) {
      console.log("💀 Game Over! Better luck next time!");
      this.isPlaying = false;
    }
  };
  
  // 💚 Heal player
  heal = (amount: number): void => {
    const healAmount = Math.min(amount, this.player.maxHealth - this.player.health);
    this.player.health += healAmount;
    console.log(`💚 Healed ${healAmount} HP! Health: ${this.player.health}/${this.player.maxHealth}`);
  };
  
  // 💰 Earn coins
  earnCoins = (amount: number): void => {
    this.player.coins += amount;
    console.log(`💰 Earned ${amount} coins! Total: ${this.player.coins}`);
  };
  
  // 🏆 Add achievement
  addAchievement = (achievement: string): void => {
    if (!this.player.achievements.includes(achievement)) {
      this.player.achievements.push(achievement);
      console.log(`🏆 Achievement unlocked: ${achievement}`);
    }
  };
  
  // 📈 Level up!
  levelUp = (): void => {
    this.player.level += 1;
    const oldMaxHealth = this.player.maxHealth;
    this.player.maxHealth += 20; // Increase max health
    this.player.health = this.player.maxHealth; // Full heal on level up
    
    console.log(`🎊 Level up! You are now level ${this.player.level}!`);
    console.log(`💪 Max health increased from ${oldMaxHealth} to ${this.player.maxHealth}`);
    
    // 🏆 Level-based achievements
    if (this.player.level === 5) {
      this.addAchievement("🌟 Apprentice Hero");
    } else if (this.player.level === 10) {
      this.addAchievement("🗡️ Skilled Warrior");
    }
  };
  
  // 📊 Computed: XP needed for next level
  get experienceToNextLevel(): number {
    return this.player.level * 100; // 100 XP per level
  };
  
  // 📊 Computed: Health percentage
  get healthPercentage(): number {
    return Math.round((this.player.health / this.player.maxHealth) * 100);
  };
  
  // 💗 Computed: Is player alive?
  get isAlive(): boolean {
    return this.player.health > 0;
  };
  
  // 📋 Display player stats
  displayStats = (): void => {
    console.log("📊 Player Stats:");
    console.log(`  👤 Name: ${this.player.name}`);
    console.log(`  📈 Level: ${this.player.level}`);
    console.log(`  ⭐ Experience: ${this.player.experience}/${this.experienceToNextLevel}`);
    console.log(`  💚 Health: ${this.player.health}/${this.player.maxHealth} (${this.healthPercentage}%)`);
    console.log(`  💰 Coins: ${this.player.coins}`);
    console.log(`  🏆 Achievements: ${this.player.achievements.join(", ")}`);
  };
}

// 🎮 Let's play!
const game = new GameStore();
game.startGame("TypeScript Warrior");
game.gainExperience(50);
game.earnCoins(25);
game.takeDamage(30);
game.heal(15);
game.displayStats();

🚀 Advanced Concepts

🧙‍♂️ Advanced Topic 1: Custom Observable Types

When you’re ready to level up, try custom observable patterns:

import { makeObservable, observable, action, computed } from 'mobx';

// 🎯 Advanced notification system
interface Notification {
  id: string;
  message: string;
  type: 'info' | 'success' | 'warning' | 'error';
  emoji: string;
  timestamp: Date;
  read: boolean;
}

class NotificationStore {
  notifications = new Map<string, Notification>(); // 📬 Observable Map
  maxNotifications = 10; // 🔢 Limit notifications
  
  constructor() {
    makeObservable(this, {
      notifications: observable,
      maxNotifications: observable,
      addNotification: action,
      markAsRead: action,
      clearAll: action,
      unreadCount: computed,
      recentNotifications: computed
    });
  }
  
  // ➕ Add notification with auto-cleanup
  addNotification = (message: string, type: Notification['type']): void => {
    const emojis = {
      info: 'ℹ️',
      success: '✅',
      warning: '⚠️',
      error: '❌'
    };
    
    const notification: Notification = {
      id: Date.now().toString(),
      message,
      type,
      emoji: emojis[type],
      timestamp: new Date(),
      read: false
    };
    
    this.notifications.set(notification.id, notification);
    
    // 🧹 Auto-cleanup old notifications
    if (this.notifications.size > this.maxNotifications) {
      const oldestId = Array.from(this.notifications.keys())[0];
      this.notifications.delete(oldestId);
    }
    
    console.log(`${notification.emoji} ${message}`);
  };
  
  // 👁️ Mark notification as read
  markAsRead = (id: string): void => {
    const notification = this.notifications.get(id);
    if (notification) {
      notification.read = true;
    }
  };
  
  // 🧹 Clear all notifications
  clearAll = (): void => {
    this.notifications.clear();
    console.log('🧹 All notifications cleared!');
  };
  
  // 📊 Computed: Unread count
  get unreadCount(): number {
    return Array.from(this.notifications.values())
      .filter(n => !n.read).length;
  };
  
  // 📊 Computed: Recent notifications (last 5)
  get recentNotifications(): Notification[] {
    return Array.from(this.notifications.values())
      .sort((a, b) => b.timestamp.getTime() - a.timestamp.getTime())
      .slice(0, 5);
  };
}

🏗️ Advanced Topic 2: Reaction Patterns

For the brave developers, here’s how to create reactive side effects:

import { makeObservable, observable, action, reaction, when } from 'mobx';

// 🚀 Advanced reactive patterns
class ReactiveStore {
  temperature = 20; // 🌡️ Temperature in Celsius
  humidity = 50; // 💧 Humidity percentage
  
  constructor() {
    makeObservable(this, {
      temperature: observable,
      humidity: observable,
      setTemperature: action,
      setHumidity: action
    });
    
    // 🔥 React to temperature changes
    reaction(
      () => this.temperature,
      (temp) => {
        if (temp > 30) {
          console.log('🔥 It\'s getting hot! Turn on AC!');
        } else if (temp < 10) {
          console.log('🧊 Brr! Turn on heating!');
        }
      }
    );
    
    // 💧 React to humidity changes
    when(
      () => this.humidity > 80,
      () => {
        console.log('💧 High humidity detected! Turn on dehumidifier!');
      }
    );
  }
  
  setTemperature = (temp: number): void => {
    this.temperature = temp;
  };
  
  setHumidity = (humidity: number): void => {
    this.humidity = humidity;
  };
}

⚠️ Common Pitfalls and Solutions

😱 Pitfall 1: Forgetting to Mark Actions

// ❌ Wrong way - modifying observable without action!
class BadCounter {
  count = 0;
  
  constructor() {
    makeObservable(this, {
      count: observable
      // 💥 Missing action annotation!
    });
  }
  
  increment(): void {
    this.count++; // 🚫 This might not trigger reactions properly!
  }
}

// ✅ Correct way - always mark your actions!
class GoodCounter {
  count = 0;
  
  constructor() {
    makeObservable(this, {
      count: observable,
      increment: action // ✨ Action properly marked!
    });
  }
  
  increment = (): void => {
    this.count++; // ✅ Safe and reactive!
  };
}

🤯 Pitfall 2: Modifying State Outside Actions

// ❌ Dangerous - direct state modification!
const counter = new GoodCounter();
counter.count = 100; // 💥 Bypassing MobX tracking!

// ✅ Safe - use actions!
const counter = new GoodCounter();
// Create a proper action for this:
class BetterCounter extends GoodCounter {
  setValue = action((value: number) => {
    this.count = value; // ✅ Proper action!
  });
}

😅 Pitfall 3: Overusing Observables

// ❌ Making everything observable unnecessarily
class OverEngineeredStore {
  private apiKey = "secret"; // 🚫 This doesn't need to be observable!
  
  constructor() {
    makeObservable(this, {
      apiKey: observable // ❌ Waste of resources!
    });
  }
}

// ✅ Only observe what changes
class EfficinetStore {
  private apiKey = "secret"; // ✅ Regular property
  userData = null; // 📊 This should be observable
  
  constructor() {
    makeObservable(this, {
      userData: observable // ✅ Only what needs to react
    });
  }
}

🛠️ Best Practices

🎯 Be Selective: Only make properties observable if they need to trigger reactions
📝 Use Actions: Always modify observable state through actions
🛡️ Enable Strict Mode: Configure MobX to enforce action usage
🎨 Computed Values: Use computed for derived state that updates automatically
✨ Keep It Simple: Don’t over-engineer your observable structures

Here’s a perfect setup:

import { configure } from 'mobx';

// 🛡️ Enable strict mode for better practices
configure({
  enforceActions: "always",
  computedRequiresReaction: true,
  reactionRequiresObservable: true,
  observableRequiresReaction: true,
  disableErrorBoundaries: true
});

🧪 Hands-On Exercise

🎯 Challenge: Build a Task Management System

Create a type-safe task management system with MobX observables:

📋 Requirements:

✅ Task items with title, completion status, priority, and due date
🏷️ Categories for tasks (work, personal, urgent)
👤 Task assignment to different users
📊 Progress tracking and statistics
🔍 Filtering and sorting capabilities
🎨 Each task needs an emoji based on category!

🚀 Bonus Points:

Add drag-and-drop priority reordering
Implement automatic overdue task detection
Create productivity statistics (tasks per day, completion rate)
Add task dependencies (can’t start until another is done)

💡 Solution

🔍 Click to see solution

import { makeObservable, observable, action, computed } from 'mobx';

// 🎯 Our type-safe task system!
interface Task {
  id: string;
  title: string;
  completed: boolean;
  priority: 'low' | 'medium' | 'high';
  category: 'work' | 'personal' | 'urgent';
  assignee?: string;
  dueDate?: Date;
  createdAt: Date;
}

interface User {
  id: string;
  name: string;
  emoji: string;
}

class TaskManager {
  tasks: Task[] = [];
  users: User[] = [
    { id: '1', name: 'Alice', emoji: '👩‍💻' },
    { id: '2', name: 'Bob', emoji: '👨‍🔧' },
    { id: '3', name: 'Charlie', emoji: '👨‍🎨' }
  ];
  
  // 🔍 Filter settings
  selectedCategory: Task['category'] | 'all' = 'all';
  selectedPriority: Task['priority'] | 'all' = 'all';
  showCompleted = true;
  
  constructor() {
    makeObservable(this, {
      tasks: observable,
      users: observable,
      selectedCategory: observable,
      selectedPriority: observable,
      showCompleted: observable,
      addTask: action,
      toggleTask: action,
      deleteTask: action,
      updateTask: action,
      setFilter: action,
      filteredTasks: computed,
      completionRate: computed,
      overdueTasks: computed,
      tasksByCategory: computed,
      productivity: computed
    });
  }
  
  // ➕ Add a new task
  addTask = (taskData: Omit<Task, 'id' | 'createdAt'>): void => {
    const categoryEmojis = {
      work: '💼',
      personal: '🏠',
      urgent: '🚨'
    };
    
    const newTask: Task = {
      ...taskData,
      id: Date.now().toString(),
      createdAt: new Date()
    };
    
    this.tasks.push(newTask);
    console.log(`✅ Added task: ${categoryEmojis[newTask.category]} ${newTask.title}`);
  };
  
  // ✅ Toggle task completion
  toggleTask = (taskId: string): void => {
    const task = this.tasks.find(t => t.id === taskId);
    if (task) {
      task.completed = !task.completed;
      console.log(`${task.completed ? '✅' : '📝'} ${task.title} ${task.completed ? 'completed' : 'reopened'}`);
    }
  };
  
  // 🗑️ Delete task
  deleteTask = (taskId: string): void => {
    const taskIndex = this.tasks.findIndex(t => t.id === taskId);
    if (taskIndex !== -1) {
      const task = this.tasks[taskIndex];
      this.tasks.splice(taskIndex, 1);
      console.log(`🗑️ Deleted task: ${task.title}`);
    }
  };
  
  // ✏️ Update task
  updateTask = (taskId: string, updates: Partial<Task>): void => {
    const task = this.tasks.find(t => t.id === taskId);
    if (task) {
      Object.assign(task, updates);
      console.log(`✏️ Updated task: ${task.title}`);
    }
  };
  
  // 🔍 Set filters
  setFilter = (category: typeof this.selectedCategory, priority: typeof this.selectedPriority, showCompleted: boolean): void => {
    this.selectedCategory = category;
    this.selectedPriority = priority;
    this.showCompleted = showCompleted;
  };
  
  // 📊 Computed: Filtered tasks
  get filteredTasks(): Task[] {
    return this.tasks.filter(task => {
      const categoryMatch = this.selectedCategory === 'all' || task.category === this.selectedCategory;
      const priorityMatch = this.selectedPriority === 'all' || task.priority === this.selectedPriority;
      const completedMatch = this.showCompleted || !task.completed;
      
      return categoryMatch && priorityMatch && completedMatch;
    });
  };
  
  // 📈 Computed: Completion rate
  get completionRate(): number {
    if (this.tasks.length === 0) return 100;
    const completed = this.tasks.filter(t => t.completed).length;
    return Math.round((completed / this.tasks.length) * 100);
  };
  
  // ⏰ Computed: Overdue tasks
  get overdueTasks(): Task[] {
    const now = new Date();
    return this.tasks.filter(task => 
      !task.completed && 
      task.dueDate && 
      task.dueDate < now
    );
  };
  
  // 🏷️ Computed: Tasks by category
  get tasksByCategory(): Record<Task['category'], number> {
    return this.tasks.reduce((acc, task) => {
      acc[task.category] = (acc[task.category] || 0) + 1;
      return acc;
    }, {} as Record<Task['category'], number>);
  };
  
  // 📊 Computed: Productivity stats
  get productivity(): { today: number; thisWeek: number; average: number } {
    const now = new Date();
    const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
    const weekAgo = new Date(today.getTime() - 7 * 24 * 60 * 60 * 1000);
    
    const completedToday = this.tasks.filter(t => 
      t.completed && t.createdAt >= today
    ).length;
    
    const completedThisWeek = this.tasks.filter(t => 
      t.completed && t.createdAt >= weekAgo
    ).length;
    
    const averagePerDay = this.tasks.length > 0 ? 
      Math.round(this.tasks.filter(t => t.completed).length / 7) : 0;
    
    return {
      today: completedToday,
      thisWeek: completedThisWeek,
      average: averagePerDay
    };
  };
  
  // 📋 Display dashboard
  displayDashboard = (): void => {
    console.log("📊 Task Dashboard:");
    console.log(`  📝 Total Tasks: ${this.tasks.length}`);
    console.log(`  ✅ Completed: ${this.tasks.filter(t => t.completed).length}`);
    console.log(`  📈 Completion Rate: ${this.completionRate}%`);
    console.log(`  ⏰ Overdue: ${this.overdueTasks.length}`);
    console.log(`  🏷️ By Category:`);
    Object.entries(this.tasksByCategory).forEach(([category, count]) => {
      const emojis = { work: '💼', personal: '🏠', urgent: '🚨' };
      console.log(`    ${emojis[category as Task['category']]} ${category}: ${count}`);
    });
    
    const { today, thisWeek, average } = this.productivity;
    console.log(`  📈 Productivity:`);
    console.log(`    Today: ${today} tasks`);
    console.log(`    This week: ${thisWeek} tasks`);
    console.log(`    Daily average: ${average} tasks`);
  };
}

// 🎮 Test the system!
const taskManager = new TaskManager();

// Add some tasks
taskManager.addTask({
  title: "Learn MobX with TypeScript",
  completed: false,
  priority: "high",
  category: "personal",
  dueDate: new Date(Date.now() + 86400000) // Tomorrow
});

taskManager.addTask({
  title: "Fix production bug",
  completed: false,
  priority: "urgent",
  category: "work",
  assignee: "1"
});

taskManager.addTask({
  title: "Buy groceries",
  completed: true,
  priority: "low",
  category: "personal"
});

taskManager.displayDashboard();

🎓 Key Takeaways

You’ve learned so much! Here’s what you can now do:

✅ Create MobX observables with confidence 💪
✅ Manage reactive state that updates automatically 🛡️
✅ Use actions and computed values properly 🎯
✅ Debug observable issues like a pro 🐛
✅ Build reactive applications with TypeScript! 🚀

Remember: MobX makes state management simple and intuitive. Your data becomes alive and reactive! 🤝

🤝 Next Steps

Congratulations! 🎉 You’ve mastered MobX Observable State with TypeScript!

Here’s what to do next:

💻 Practice with the task management exercise above
🏗️ Build a reactive app using MobX observables
📚 Move on to our next tutorial: “MobX Actions and Reactions: State Mutations”
🌟 Share your reactive creations with the community!

Remember: Every MobX expert was once a beginner. Keep coding, keep learning, and most importantly, enjoy watching your state come alive! 🚀

Happy coding! 🎉🚀✨

Prerequisites

What you'll learn