TypeScript has become the industry standard for scalable JS apps. Understanding high-level patterns like Generics and Utility Types is key to building durable systems.
The Power of Generics
Generics allow you to create components and functions that work over a variety of types rather than a single one. This leads to much more reusable and type-safe utilities.
interface ApiResponse<T> {
data: T;
error: string | null;
}
// Usage with a specific user type
const response: ApiResponse<User> = await fetchUser();Mapped and Conditional Types
Advanced features like 'Partial', 'Pick', and conditional types allow you to transform existing types into new ones, maintaining a single source of truth for your data models.
Key Insight
Type safety is your first line of defense against production bugs and your best tool for codebase refactoring.
