isolate_functions library Null safety


IsolateInitializer = Future<List> Function(IsolateInitializeArguments)
Signature for initialization function which would be run in Isolate to initialize your things and provide them to the contexts of workers. Initializer must be a global or static function.
IsolateManagerCreator = Future<IsolateManager> Function(IsolateRun , IsolateInitializer , IsolateInitializeArguments)
IsolateWorkerKiller = void Function(String id)
IsolateWorkersCreator<A, S> = List<IsolateWorker> Function()