Class based middleware

[kyleect]

abstract class BaseMiddleware {
  call(this, setup: Setup, events?: EventEmitter) {
    // run middleware...
  }

  abstract setup(setup: Setup, events?: EventEmitter);
  results(results: Results) {};
}

class CustomMiddleware extends BaseMiddleware {
  setup(setup: Setup, events?: EventEmitter) {
    // setup stuff...
  }
  results(results: Results) {
    // results stuff...
  }
}