tests/cases/compiler/targetTypeCastTest.ts(1,13): error TS2300: Duplicate identifier 'Point'. tests/cases/compiler/targetTypeCastTest.ts(3,10): error TS2300: Duplicate identifier 'Point'. ==== tests/cases/compiler/targetTypeCastTest.ts (2 errors) ==== declare var Point: { new(x:number, y:number): {x: number; y: number; }; } ~~~~~ !!! error TS2300: Duplicate identifier 'Point'. function Point(x, y) { ~~~~~ !!! error TS2300: Duplicate identifier 'Point'. this.x = x; this.y = y; } interface Adder { (x: number, y: number): number; } var add = function(x,y) { return x+ y; } interface Adder2 { (x: number, y: number): number; } var add2: Adder2 = function(x,y) { return 0; } function add3(x,y) {x}