export type ExecutorNextFunction<NodeName> = (node: NodeName | NodeName[]) => void;
export type ExecutorExitFunction<NodeName> = (exitWith?: Error | NodeName | NodeName[]) => void;
export type ExecutorRetryFunction = (error?: Error) => void;
export type Executor<DataType, NodeName extends string> = (data: DataType, next: ExecutorNextFunction<NodeName>, exit: ExecutorExitFunction<NodeName>, retry: ExecutorRetryFunction, error?: Error) => Promise<any> | any;
export type Middleware<DataType, NodeName extends string> = (data: DataType, next: ExecutorNextFunction<NodeName>, exit: ExecutorExitFunction<NodeName>) => Promise<any> | any;