anchor.diff:      this.antialiasing = true,
       this.controllers = const [],
       this.onInit,
  -  }) : src = _Source.network;
  +    Key? key,
  +  })  : file = null,
  +        src = _Source.network,
  +        super(key: key);
   
     const RiveAnimation.file(
       this.name, {
  
positive.code:       }
      });
  
      // Add any user-created contollers
      widget.controllers.forEach(artboard.addController);
  
      setState(() => _artboard = artboard);
  
negative.code:     this.antialiasing = true,
      this.controllers = const [],
      this.onInit,
      Key? key,
    })  : file = null,
          src = _Source.file,
          super(key: key);
  
    const RiveAnimation.riveFile(
      this.file, {
      this.artboard,
      this.animations = const [],
      this.stateMachines = const [],
      this.fit,
      this.alignment,
      this.placeHolder,
      this.antialiasing = true,
      this.controllers = const [],
      this.onInit,
      Key? key,
    })  : name = null,
          src = _Source.riveFile,
          super(key: key);
  
    @override
    _RiveAnimationState createState() => _RiveAnimationState();
  