tests/cases/compiler/callConstructAssignment.ts(7,1): error TS2322: Type 'new () => any' is not assignable to type '() => void'. tests/cases/compiler/callConstructAssignment.ts(8,1): error TS2322: Type '() => void' is not assignable to type 'new () => any'. ==== tests/cases/compiler/callConstructAssignment.ts (2 errors) ==== var foo:{ ( ):void; } var bar:{ new ( ):any; } foo = bar; // error ~~~ !!! error TS2322: Type 'new () => any' is not assignable to type '() => void'. bar = foo; // error ~~~ !!! error TS2322: Type '() => void' is not assignable to type 'new () => any'.