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RequiredExcept<Original, Keys>

RequiredExcept<Original, Keys> = Required<Omit<Original, Keys>> & Partial<Pick<Original, Keys>>

Creates a type where all keys become required except the specified ones which remain optional.

Type Parameters​

Original: Original​

The original object type.

Keys: Keys extends keyof Original​

The keys that should remain optional.

Since​

1.0.0

Example​

type User = {
  id?: string;      // Optional
  name?: string;    // Optional
  email?: string;   // Optional
  avatar?: string;  // Optional
};

// RequiredExcept<User, "avatar">
// Results in: { id: string; name: string; email: string; avatar?: string; }
type UserRequired = RequiredExcept<User, "avatar">;

const user: UserRequired = {
  id: "123",        // Required (became required)
  name: "John",     // Required (became required)
  email: "john@example.com", // Required (became required)
  // avatar remains optional (kept as optional)
};