why typescript's empty object type doesn't mean an empty object without any properties? [duplicate]

interface Person { name: string };

let person : Person = { name: "John Smith" };

let empt: {} = person;

I don't really understand the idea why typescript allow the above code to be compiled, isn't that {} means it doesn't contain any properties, but Person has one property name, {} obviously doesn't contain a property name called name, how Person type can be assignable to an empty type?