This is a types helper based on the specific types of properties. Created in this article to practice and study https://dev.to/busypeoples/notes-on-typescript-type-level-programming-part-3-3l03

type-helpers.ts

type User = {
  id: number,
  name: string,
  age: number,
  active: boolean,
}

type FilterByType<T, U> = {
  [K in keyof T]: T[K] extends U ? K : never
}[keyof T]

type IncludesByType<Obj, T> = Pick<Obj, FilterByType<Obj, T>>
type ExcludesByType<Obj, T> = Omit<Obj, FilterByType<Obj, T>>

type ReadOnlyByType<Obj, T> = ExcludesByType<Obj, T> & Readonly<IncludesByType<Obj, T>>;

type OptionalByType<Obj, T> = Partial<IncludesByType<Obj, T>> & ExcludesByType<Obj, T>
type RequiredByType<Obj, T> = Partial<ExcludesByType<Obj, T>> & IncludesByType<Obj, T>

type OnlyMakeTypeOptional<Obj, T> = Partial<IncludesByType<Obj, T>> & ExcludesByType<Obj, T>
type OnlyMakeTypeRequired<Obj, T> = Required<IncludesByType<Obj, T>> & ExcludesByType<Obj, T>

// Make a only boolean types as readonly
const user: ReadOnlyByType<User, boolean> = {
  id: 1,
  name: 'string',
  age: 2,
  active: true,
}
// Error!! - boolean properties in the User are readonly
user.active = false;
// Right
user.name = 'name'