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+# GitHub Copilot Instructions for TypeScript and JavaScript Projects
+
+These instructions help GitHub Copilot generate code that aligns with our team's standards and avoids common issues in JavaScript and TypeScript development.
+
+---
+
+## ✅ General Guidelines
+
+- Use only officially supported JavaScript and TypeScript APIs.
+- Avoid suggesting third-party libraries unless explicitly listed in `package.json`.
+- Prefer native language features over external utilities.
+
+---
+
+## 🛡️ Common Issue Prevention Checks
+
+### 1. Official API Usage
+
+- Only use officially supported JavaScript/TypeScript APIs and Node.js built-in modules
+- Avoid experimental, deprecated, or non-standard APIs
+- Verify API availability in the target Node.js version before suggesting
+- Prefer stable, documented APIs over cutting-edge features
+
+### 2. Type Safety (TypeScript)
+
+- Avoid any types and type assertions without justification
+- Prefer proper typing and type guards for unknown data
+
+### 3. Null/Undefined Safety
+
+- Avoid unsafe property access that could throw errors
+- Prefer safe navigation with optional chaining and nullish coalescing
+
+### 4. Error Handling
+
+- Avoid ignoring errors or using generic catch blocks
+- Prefer explicit error handling with proper typing and meaningful error messages
+
+### 5. Async/Await Best Practices
+
+- Avoid Promise constructor anti-patterns and missing error handling
+- Prefer proper async patterns with comprehensive error handling
+
+### 6. Array and Object Operations
+
+- Avoid mutating operations and unsafe array access
+- Prefer immutable operations and safe access patterns
+
+### 7. Function Parameters and Return Types
+
+- Avoid unclear parameter types and missing return types
+- Prefer explicit types and input validation
+
+### 8. Variable Declarations
+
+- Avoid var declarations and unnecessary let usage
+- Prefer const by default, let only when reassignment is needed
+
+### 9. Comparison Operations
+
+- Avoid loose equality and implicit boolean conversions
+- Prefer strict equality and explicit checks
+
+### 10. Memory Leaks Prevention
+
+- Avoid unremoved event listeners and unclosed resources
+- Prefer proper cleanup patterns and resource management
+
+### 11. Performance Considerations
+
+- Avoid unnecessary operations in loops and inefficient patterns
+- Prefer optimized patterns and consider memoization for expensive operations
+
+---
+
+## 📋 Code Review Checklist
+
+Before suggesting code, ensure:
+
+- [ ] Only official APIs and standard library features are used
+- [ ] All variables have appropriate types (TypeScript)
+- [ ] Null/undefined safety is handled
+- [ ] Errors are properly caught and handled
+- [ ] No memory leaks (event listeners, timers, etc.)
+- [ ] Functions have single responsibility
+- [ ] No magic numbers or strings (use constants)
+- [ ] Async operations are properly awaited
+- [ ] Arrays/objects are not mutated unexpectedly
+- [ ] Performance implications are considered
+- [ ] Code follows existing project patterns
+
+---
+
+## 🚀 Modern JavaScript/TypeScript Features to Prefer
+
+- Optional chaining (`?.`) and nullish coalescing (`??`)
+- Destructuring assignment for cleaner code
+- Template literals instead of string concatenation
+- Arrow functions for short, pure functions
+- `const` assertions for immutable data
+- `satisfies` operator for type checking without widening
+- `Record<K, V>` for object types with known keys