Typescript options object helper

index.ts

// helper type
type RequiredProps<T, K extends keyof T> = Partial<T> & Required<Pick<T, K>>

type Person = {
  id: string
  name: string
  formatted_name: string
  age: number
}

function createPerson(person: RequiredProps<Person, "name" | "age">): Person {
  return {
    id: person.id || "1",
    name: person.name,
    age: person.age,
    formatted_name: person.formatted_name || "The one and only " + person.name,
  }
}

console.log(createPerson({ name: "Dave", age: 33 }));
console.log(createPerson({ name: "Dave", age: 33, formatted_name: "Master Dave" }));