Typescript: Do I need to import all types associated with an imported interface?

Question

typescript

export interface IFoo {
    bar: TBar[]
}
type TBar = {
    a: string;
    b: number;
}

If I import an interface IFoo, do I need to import also TBar?
I'm using VS Code, which doesn't give hints for fields in TBar, until you import TBar.

Answer 1

If you yourself use an identifier of the TBar type, then you need to import it, do not use it, i.e. for example write like this:

const foo: IFoo = {
    bar: [
        {a: "white", b: 10},
        {a: "black", b: 20}
   ]
}

that is not necessary.