// @lib: es5 var id: number = 10000; var name: string = "my name"; var person: { b: string; id: number } = { name, id }; // error var person1: { name, id }; // ok function foo(name: string, id: number): { id: string, name: number } { return { name, id }; } // error function bar(obj: { name: string; id: boolean }) { } bar({ name, id }); // error