tests/cases/compiler/functionOverloads18.ts(1,10): error TS2394: Overload signature is not compatible with function implementation. ==== tests/cases/compiler/functionOverloads18.ts (1 errors) ==== function foo(bar:{a:number;}); ~~~ !!! error TS2394: Overload signature is not compatible with function implementation. function foo(bar:{a:string;}) { return {a:""} }