That’s barely scratching the surface.

In TypeScript the following is also valid:

class Something{

    value: Number

}

class SomethingElse{

    value: Number

    foo: String

    bar: SomeOtherThing[]

}

function AddSomething(v: Something)

{

    v.value += 1;

}

var ex = new SomethingElse{

    value: 3,

    foo: “TypeScript is fake types”,

    bar: []

};

AddSomething(ex);

Why does it work? Because in TypeScript as long as you have a “shape” that fits, it’s the “same type.”

Complete and utter insanity to me, to pretend there’s any real type checking, when types are entirely fake and made up.