TypeScript Utility Types Cheatsheet

Quick reference for TypeScript’s built-in utility types that I use frequently:

Pick and Omit

type User = {
  id: string;
  name: string;
  email: string;
  password: string;
};

// Pick only what you need
type PublicUser = Pick<User, 'id' | 'name'>;

// Omit what you don't want
type UserWithoutPassword = Omit<User, 'password'>;

Partial and Required

// All properties optional
type PartialUser = Partial<User>;

// All properties required
type RequiredUser = Required<User>;

Record

Great for typed objects:

type UserRoles = Record<string, 'admin' | 'user' | 'guest'>;

const roles: UserRoles = {
  'user-1': 'admin',
  'user-2': 'user',
};

ReturnType

Extract the return type of a function:

function getUser() {
  return { id: '1', name: 'John' };
}

type User = ReturnType<typeof getUser>;

These utilities make TypeScript code more maintainable and DRY.