Type alias MakeOptional<T, K>

Constructs a new type from T where the specified keys K become optional, while all other keys preserve their original modifiers.

Unlike the naive Omit<T, K> & Partial<Pick<T, K>> form, this version also preserves keys that were already optional in T, which makes it safer for exact type-equality tests and library-grade type transforms.

Example

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

type Result = MakeOptional<User, 'email'>;

// {
//   id: string;
//   name: string;
//   email?: string;
// }
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Example

type Config = {
  host?: string;
  port: number;
  secure: boolean;
};

type Result = MakeOptional<Config, 'secure'>;

// {
//   host?: string;
//   port: number;
//   secure?: boolean;
// }
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