Type alias MakeNullishOptional<T>

Makes all shallow properties of an object optional if they accept undefined or null as a value.

Example

type MyOptionalType = MakeUndefinedOptional<{
  id: number | undefined,
  firstName: string,
  lastName: string | null,
}>;

// is equal to

type MyOptionalType = {
  // this property is optional.
  id?: number | undefined,
  firstName: string,
  // this property is optional.
  lastName?: string | null,
};