Variable middleware

middleware: () => (req: any, res: any, next: any) => void = middleware

- (): (req: any, res: any, next: any) => void
- Builds the express middleware that applies both rules to every request in active-active mode: catch up with the change log before serving, and hold the answer until the request's writes commit.
  
  Returns (req: any, res: any, next: any) => void
  the middleware