Kevin Coyle
Kevin Coyle

TypeScript Utility Types

TypeScript utility types are incredible time savers.

My most used:

  • Partial<T> — Make all properties optional
  • Required<T> — Make all properties required
  • Pick<T, K> — Pick specific properties
  • Omit<T, K> — Omit specific properties
  • Record<K, T> — Create an object type with specific keys

Example:

interface User {
  id: string;
  name: string;
  email: string;
  password: string;
}

// Use all properties except password
type UserRegistration = Omit<User, 'password'>;

// Use only name and email
type UserContact = Pick<User, 'name' | 'email'>;

Custom conditional types unlock even more power:

type Nullable<T> = T | null;
type Async<T> = Promise<T>;

The TypeScript handbook has great docs on utility types.