JSCallFunction1Arg typedef
        JSCallFunction1Arg =
     int Function(Pointer<JSContext>  ctx, Pointer<JSValueConst>  function, Pointer<JSValueConst>  object, Pointer<JSValueConst>  result, Pointer<Pointer<Utf8NullTerminated> >  stringResult)
    
    
    
Implementation
typedef JSCallFunction1Arg = int Function(
  Pointer<JSContext> ctx,
  Pointer<JSValueConst> function,
  Pointer<JSValueConst> object,
  Pointer<JSValueConst> result,
  Pointer<Pointer<Utf8NullTerminated>> stringResult,
);