typeAsSet.ts

type Person = {
   name: string;
   surname: string
}

type Lifespan = {
   birth: Date;
   death: Date
}

type PersonSpan = Person | Lifespan


let o1 = {
   name: "Alan",
   surname: "Turing",
   birth: new Date('1912/06/23'),
   death: new Date('1954/06/07')
}
const ps1: PersonSpan = o1
// HATA YOK

let o2 = {
   name: "Claude Elwood",
   birth: new Date('1916/04/30')
}
const ps2: PersonSpan = o2
// Type '{ name: string; birth: Date; }' is not assignable to type 'PersonSpan'. Property 'death' is missing in type '{ name: string; birth: Date; }' but required in type 'Lifespan'.

let o3 = {
   name: "Claude Elwood",
   surname: "Shannon",
}
const ps3: PersonSpan = o3
// HATA YOK


let scientist = {
   name: "Claude Elwood",
   surname: "Shannon",
   fields: "Mathematics and Electronic Engineering"
   // "fields" property'si tip kontrolünde dikkate alınmaz
}
const person: Person = scientist