export type NextFn = () => Promise<any> | any;
/**
 * Final handler is called when the entire chain has been
 * executed successfully.
 */
export type FinalHandler = () => Promise<any>;
/**
 * Error handler is called any method in the pipeline raises
 * an exception
 */
export type ErrorHandler = (error: any) => Promise<any>;
/**
 * The executor function that invokes the middleware
 */
export type Executor<MiddlewareFn extends any> = (middleware: MiddlewareFn, next: NextFn) => Promise<any>;