I need to use type without optional fields and convert this type to required fields with type “value | undefined” for optional keys only. How can I do it?

for example:

we have a type:

interface AnyObject {
  a: string;
  b?: number;
}

my new type must convert this to type to:

interface CorrectAnyObject {
  a: string;
  b: number | undefined;
}