Add additional characteristics to the current interface without needing to create a separate interface

Imagine I have an interface:

interface Cat {
  name: string;
  age: number;
  color: string;
}

Now, I want to create an object with a new interface that extends partial Cat and adds new properties:

interface MyCat extends Partial<Cat> {
  sex: "male" | "female"
}
const cat: MyCat = {name: "Tom", sex: "male"}

Currently, this is working fine. However, what if I don't want to declare a new interface (MyCat) if I won't use it again, and instead just want to assign the type when creating the object like this:

const cat: Partial<Cat> {sex: "male" | "female"} = {name: "Tom", sex: "male"}

How can I achieve this?

Answer №1

It seems like you're almost there, just one small detail to adjust by adding an &:

const kitty: Partial<Cat> & {gender: "male" | "female"} = {name: "Tom", gender: "male"}

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