improve

src/app/shared/publication/view-publications/view-publications.module.ts

@@ -9,6 +9,7 @@ import { ViewPublicationsPage } from './view-publications.page';
 import { Attributes, IntersectionObserverHooks, LazyLoadImageModule, LAZYLOAD_IMAGE_HOOKS } from 'ng-lazyload-image';
 import { PublicationCardPageModule  } from './publication-card/publication-card.module'
 import { ShowMorePageModule } from './show-more/show-more.module';
+import { VisibilityDirective } from 'src/app/services/directives/visibility.directive';
 export class LazyLoadImageHooks extends IntersectionObserverHooks {
 setup(attributes: Attributes) {
   attributes.offset = 10;
@@ -30,7 +31,7 @@ setup(attributes: Attributes) {
     PublicationCardPageModule
   ],
   exports: [ViewPublicationsPage],
-  declarations: [ViewPublicationsPage],
+  declarations: [ViewPublicationsPage, VisibilityDirective],
   providers: [{provide: LAZYLOAD_IMAGE_HOOKS, useClass: LazyLoadImageHooks}],
   schemas: [CUSTOM_ELEMENTS_SCHEMA]
 })