tests/cases/compiler/functionOverloads22.ts(2,10): error TS2394: Overload signature is not compatible with function implementation. ==== tests/cases/compiler/functionOverloads22.ts (1 errors) ==== function foo(bar:number):{a:number;}[]; function foo(bar:string):{a:number; b:string;}[]; ~~~ !!! error TS2394: Overload signature is not compatible with function implementation. function foo(bar:any):{a:any;b?:any;}[] { return [{a:""}] }