//// [unknownTypeArgOnCall.ts] class Foo { public clone() { return null; } } var f = new Foo(); var r = f.clone() //// [unknownTypeArgOnCall.js] var Foo = (function () { function Foo() { } Foo.prototype.clone = function () { return null; }; return Foo; })(); var f = new Foo(); var r = f.clone();