Union and Intersection Typescript

type NobDeveloper = {
    name: string;
};

type JuniorDeveloper = NobDeveloper & {
    expertise: string;
    experience: number;
};

const newDeveloper: NobDeveloper | JuniorDeveloper = {
    name: "Tom Holand",
    expertise: "JS",
    experience: 5,
};