如何描述 object 与 typescript 的唯一区别？

Question

I receive a pretty big object from serverside, let say

{
 id:'asd123',
 created: 1591605861388,
 // hundred of fields more...  
}

My model type actualy is the same except the "created" - this is Date.

type Model = {
 id: string,
 created: Date,
 ...
}

I need to create function that creates model of type Model

function x(raw:???):Model{ // intentionally simplified
 return { 
    ...raw,
    created: new Date(raw.created) 
  }
} 

What i have to write instead of question marks? How can i define this in typescript?

Answer 1

You can use Omit

Playground

type Model = {
 id: string,
 created: Date,
}

type Model2 = Omit<Model, 'created'> & {
    created: string;
}

const test: Model2 = {
    created: '2020-08-12',
    id: '123'
}