Mastering TypeScript: Advanced Types and Patterns

TypeScript offers powerful type constructs to help you write safer and more expressive code. This article explores its more advanced features.

1. Conditional Types

type IsString = T extends string ? true : false;

2. Mapped Types

type Readonly = { readonly [P in keyof T]: T[P] };

3. Template Literal Types

type EventName = `${T}Event`;

4. Inference in conditional types

type ReturnType = T extends (...args: any) => infer R ? R : any;

5. Utility Types & Composition

Leverage built‑in types like Partial, Pick, Exclude, and compose custom ones.

Conclusion

Understanding and applying these patterns can make your TypeScript code robust, maintainable, and self‑documenting.