transform(objects: Array<StepKind>, config: StepVisibleConfig) {
   if (!this.currentFlowService.loaded) {
     return false;
   }
   const position = config.position;
   const previous = this.currentFlowService.getPreviousSteps(config.position);
   const subsequent = this.currentFlowService.getSubsequentSteps(config.position);
   return objects.filter((s: StepKind) => {
     if (s.visible && typeof s.visible === 'function') {
       return s.visible(position, previous, subsequent);
     }
     return true;
   });
 }

 validateFlow() {
   if (!this.currentFlowService.loaded) {
     return;
   }
   if (this.currentFlowService.getStartConnection() === undefined) {
     this.router.navigate(
       ['connection-select', this.currentFlowService.getFirstPosition()],
       { relativeTo: this.route.parent }
     );
     return;
   }
   if (this.currentFlowService.getEndConnection() === undefined) {
     this.router.navigate(
       ['connection-select', this.currentFlowService.getLastPosition()],
       { relativeTo: this.route.parent }
     );
     return;
   }
 }

 onClick() {
   const step = this.currentFlowService.getStep(this.position);
   // Currently a half-configured step doesn't have this, so we can
   // remove it, otherwise we'll just discard any changes.
   if (!step.configuredProperties) {
     this.currentFlowService.events.emit({
       kind: 'integration-remove-step',
       position: this.position,
       onSave: () => {
         this.router.navigate(['save-or-add-step'], {
           relativeTo: this.route.parent
         });
       }
     });
   } else {
     this.router.navigate(['save-or-add-step'], {
       relativeTo: this.route.parent
     });
   }
 }

 isIntermediateStep(): boolean {
   return (
     this.position !== 0 &&
     this.position !== this.currentFlowService.getLastPosition()
   );
 }

 getMiddleSteps() {
   return this.currentFlowService.getMiddleSteps();
 }

 lastPosition() {
   return this.currentFlowService.getLastPosition();
 }

 endConnection() {
   return this.currentFlowService.getEndStep();
 }

 startConnection() {
   return this.currentFlowService.getStartStep();
 }