TypeScript Advanced Types

Generics and Conditional Types

TypeScript's type system is powerful. Generics create reusable components, while conditional types select types based on conditions.

Utility Types

type Partial<T> = { [P in keyof T]?: T[P] }
type Readonly<T> = { readonly [P in keyof T]: T[P] }
type Pick<T, K> = { [P in K]: T[P] }
type Omit<T, K> = Pick<T, Exclude<keyof T, K>>

Infer Keyword

type ReturnType<T> = T extends (...args: any[]) => infer R ? R : never
type UnpackPromise<T> = T extends Promise<infer U> ? U : T

Use Cases

• Form validation types
• API response types
• State management types
• Route parameter types