RunnableWithFallback<RunInput extends Object?, RunOutput extends Object?>  constructor 
      
      RunnableWithFallback<RunInput extends Object?, RunOutput extends Object?> ({ 
    
    
- required Runnable<RunInput, RunnableOptions, RunOutput> mainRunnable,
- required List<Runnable< fallbacks,RunInput, RunnableOptions, RunOutput> >
Implementation
RunnableWithFallback({required this.mainRunnable, required this.fallbacks})
  : super(defaultOptions: const RunnableOptions());