How to deal with objects of different interfaces in TypeScript?

Question

typescript

There are two interfaces:

interface IHome {
  a: 1
}
interface IMan {
  b: "1",
  c: Function
}

And there is a function that should be able to work with objects of different interfaces, i.e. with IHome and IMan.
Interfaces do not have common properties and methods, and the union type allows you to work only with common properties and methods

function (param: IHome | Man): number

Answer 1

Use type guard inside a function