diff --git a/src/app/item-page/edit-item-page/edit-item-page.routing.module.ts b/src/app/item-page/edit-item-page/edit-item-page.routing.module.ts
index ee4c563646..22fd528653 100644
--- a/src/app/item-page/edit-item-page/edit-item-page.routing.module.ts
+++ b/src/app/item-page/edit-item-page/edit-item-page.routing.module.ts
@@ -10,7 +10,7 @@ import { ItemStatusComponent } from './item-status/item-status.component';
 import { ItemBitstreamsComponent } from './item-bitstreams/item-bitstreams.component';
 import { ItemCollectionMapperComponent } from './item-collection-mapper/item-collection-mapper.component';
 import { ItemMoveComponent } from './item-move/item-move.component';
-import { ItemRegisterDoiComponent } from './item-register-doi/item-registerdoi.component'
+import { ItemRegisterDoiComponent } from './item-register-doi/item-registerdoi.component';
 import { ItemRelationshipsComponent } from './item-relationships/item-relationships.component';
 import { I18nBreadcrumbResolver } from '../../core/breadcrumbs/i18n-breadcrumb.resolver';
 import { ItemVersionHistoryComponent } from './item-version-history/item-version-history.component';
diff --git a/src/app/item-page/edit-item-page/item-register-doi/item-registerdoi.component.ts b/src/app/item-page/edit-item-page/item-register-doi/item-registerdoi.component.ts
index 060fef3b32..15af4ea633 100644
--- a/src/app/item-page/edit-item-page/item-register-doi/item-registerdoi.component.ts
+++ b/src/app/item-page/edit-item-page/item-register-doi/item-registerdoi.component.ts
@@ -27,7 +27,7 @@ export class ItemRegisterDoiComponent extends AbstractSimpleItemActionComponent
   protected messageKey = 'registerdoi';
   doiToUpdateMessage = 'item.edit.' + this.messageKey + '.to-update';
   identifiers$: Observable<Identifier[]>;
-  processing: boolean = false;
+  processing = false;
 
   constructor(protected route: ActivatedRoute,
               protected router: Router,
@@ -38,6 +38,9 @@ export class ItemRegisterDoiComponent extends AbstractSimpleItemActionComponent
     super(route, router, notificationsService, itemDataService, translateService);
   }
 
+  /**
+   * Initialise component
+   */
   ngOnInit(): void {
     this.itemRD$ = this.route.data.pipe(
       map((data) => data.dso),
@@ -74,6 +77,9 @@ export class ItemRegisterDoiComponent extends AbstractSimpleItemActionComponent
     this.registerDoi();
   }
 
+  /**
+   * Request that a pending, minted or null DOI be queued for registration
+   */
   registerDoi() {
     this.processing = true;
     this.itemDataService.registerDOI(this.item.id).pipe(getFirstCompletedRemoteData()).subscribe(
diff --git a/src/app/item-page/edit-item-page/item-status/item-status.component.ts b/src/app/item-page/edit-item-page/item-status/item-status.component.ts
index a719e621dc..df636d78dc 100644
--- a/src/app/item-page/edit-item-page/item-status/item-status.component.ts
+++ b/src/app/item-page/edit-item-page/item-status/item-status.component.ts
@@ -113,7 +113,7 @@ export class ItemStatusComponent implements OnInit {
       // Observable for configuration determining whether the Register DOI feature is enabled
       let registerConfigEnabled$: Observable<boolean> = this.configurationService.findByPropertyName('identifiers.item-status.register').pipe(
         map((enabled: RemoteData<ConfigurationProperty>) => {
-          let show: boolean = false;
+          let show = false;
           if (enabled.hasSucceeded) {
             if (enabled.payload !== undefined && enabled.payload !== null) {
               if (enabled.payload.values !== undefined) {
@@ -154,14 +154,14 @@ export class ItemStatusComponent implements OnInit {
       let showRegister$: Observable<boolean> = combineLatest([this.identifiers$, registerConfigEnabled$]).pipe(
         distinctUntilChanged(),
         map(([identifiers, enabled]) => {
-          let no_doi: boolean = true;
-          let pending: boolean = false;
+          let no_doi = true;
+          let pending = false;
           if (identifiers !== undefined && identifiers !== null) {
             identifiers.forEach((identifier: Identifier) => {
-              if (hasValue(identifier) && identifier.identifierType == 'doi') {
+              if (hasValue(identifier) && identifier.identifierType === 'doi') {
                 // The item has some kind of DOI
                 no_doi = false;
-                if (identifier.identifierStatus == '10' || identifier.identifierStatus == '11'
+                if (identifier.identifierStatus === '10' || identifier.identifierStatus === '11'
                   || identifier.identifierStatus == null) {
                   // The item's DOI is pending, minted or null.
                   // It isn't registered, reserved, queued for registration or reservation or update, deleted
@@ -174,7 +174,7 @@ export class ItemStatusComponent implements OnInit {
           // If there is no DOI, or a pending/minted/null DOI, and the config is enabled, return true
           return ((pending || no_doi) && enabled);
         })
-      )
+      );
 
       // Subscribe to changes from the showRegister check and rebuild operations list accordingly
       this.subs.push(showRegister$.subscribe((show) => {