//// [generics1NoError.ts] interface A { a: string; } interface B extends A { b: string; } interface C extends B { c: string; } interface G { x: T; y: U; } var v1: G; // Ok var v2: G<{ a: string }, C>; // Ok, equivalent to G var v4: G, C>; // Ok //// [generics1NoError.js] var v1; // Ok var v2; // Ok, equivalent to G var v4; // Ok //// [generics1NoError.d.ts] interface A { a: string; } interface B extends A { b: string; } interface C extends B { c: string; } interface G { x: T; y: U; } declare var v1: G; declare var v2: G<{ a: string; }, C>; declare var v4: G, C>;