MOBILE-4842 chore: Review most of viewChild to reduce errors

crazyserver · crazyserver · commit 033639f7dadb · 2025-10-20T11:57:09.000+02:00
diff --git a/src/addons/messages/pages/discussion/discussion.ts b/src/addons/messages/pages/discussion/discussion.ts
@@ -70,7 +70,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonMessagesDiscussionPage implements OnInit, OnDestroy, AfterViewInit {
 
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
     readonly infinite = viewChild(CoreInfiniteLoadingComponent);
 
     protected fetching = false;
@@ -174,7 +174,7 @@ export default class AddonMessagesDiscussionPage implements OnInit, OnDestroy, A
      * @inheritdoc
      */
     async ngAfterViewInit(): Promise<void> {
-        this.scrollElement = await this.content()?.getScrollElement();
+        this.scrollElement = await this.content().getScrollElement();
     }
 
     /**
@@ -878,7 +878,7 @@ export default class AddonMessagesDiscussionPage implements OnInit, OnDestroy, A
                 const newScrollHeight = (this.scrollElement?.scrollHeight || 0);
                 const scrollTo = newScrollHeight - oldScrollBottom + infiniteHeight;
 
-                this.content()?.scrollToPoint(0, scrollTo, 0);
+                this.content().scrollToPoint(0, scrollTo, 0);
             }, 30);
         }, 30);
     }
diff --git a/src/addons/messages/pages/group-conversations/group-conversations.ts b/src/addons/messages/pages/group-conversations/group-conversations.ts
@@ -73,7 +73,7 @@ const enum AddonMessagesGroupConversationOptionNames {
 export default class AddonMessagesGroupConversationsPage implements OnInit, OnDestroy {
 
     readonly splitView = viewChild.required(CoreSplitViewComponent);
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
     readonly accordionGroup = viewChild.required<IonAccordionGroup>('accordionGroup');
 
     loaded = false;
@@ -189,7 +189,7 @@ export default class AddonMessagesGroupConversationsPage implements OnInit, OnDe
 
                     if (isNewer) {
                         // The last message is newer than the previous one, scroll to top to keep viewing the conversation.
-                        this.content()?.scrollToTop();
+                        this.content().scrollToTop();
                     }
                 }
             },
diff --git a/src/addons/mod/assign/pages/index/index.ts b/src/addons/mod/assign/pages/index/index.ts
@@ -35,7 +35,7 @@ export default class AddonModAssignIndexPage extends CoreCourseModuleMainActivit
 
     private action?: string;
 
-    readonly activityComponent = viewChild(AddonModAssignIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModAssignIndexComponent);
 
     constructor() {
         super();
@@ -49,8 +49,8 @@ export default class AddonModAssignIndexPage extends CoreCourseModuleMainActivit
     async ngAfterViewInit(): Promise<void> {
         switch (this.action) {
             case 'editsubmission':
-                await CoreWait.waitFor(() => !!this.activityComponent()?.submissionComponent(), { timeout: 5000 });
-                await this.activityComponent()?.submissionComponent()?.goToEdit();
+                await CoreWait.waitFor(() => !!this.activityComponent().submissionComponent(), { timeout: 5000 });
+                await this.activityComponent().submissionComponent()?.goToEdit();
 
                 break;
         }
diff --git a/src/addons/mod/assign/submission/comments/component/comments.ts b/src/addons/mod/assign/submission/comments/component/comments.ts
@@ -33,7 +33,7 @@ import { ADDON_MOD_ASSIGN_COMMENTS_AREA, ADDON_MOD_ASSIGN_COMMENTS_COMPONENT_NAM
 })
 export class AddonModAssignSubmissionCommentsComponent extends AddonModAssignSubmissionPluginBaseComponent {
 
-    readonly commentsComponent = viewChild.required(CoreCommentsCommentsComponent);
+    readonly commentsComponent = viewChild(CoreCommentsCommentsComponent);
 
     commentsEnabled: boolean;
 
diff --git a/src/addons/mod/bigbluebuttonbn/pages/index/index.ts b/src/addons/mod/bigbluebuttonbn/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModBBBIndexPage extends CoreCourseModuleMainActivityPage<AddonModBBBIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModBBBIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModBBBIndexComponent);
 
 }
diff --git a/src/addons/mod/book/pages/index/index.ts b/src/addons/mod/book/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModBookIndexPage extends CoreCourseModuleMainActivityPage<AddonModBookIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModBookIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModBookIndexComponent);
 
 }
diff --git a/src/addons/mod/chat/pages/chat/chat.ts b/src/addons/mod/chat/pages/chat/chat.ts
@@ -49,7 +49,7 @@ export default class AddonModChatChatPage implements OnInit, OnDestroy, CanLeave
 
     protected static readonly POLL_INTERVAL = 4000;
 
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
     readonly sendMessageForm = viewChild(CoreSendMessageFormComponent);
 
     loaded = false;
@@ -360,7 +360,7 @@ export default class AddonModChatChatPage implements OnInit, OnDestroy, CanLeave
         // Need a timeout to leave time to the view to be rendered.
         await CoreWait.nextTick();
         if (!this.viewDestroyed) {
-            this.content()?.scrollToBottom();
+            this.content().scrollToBottom();
         }
     }
 
diff --git a/src/addons/mod/chat/pages/index/index.ts b/src/addons/mod/chat/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModChatIndexPage extends CoreCourseModuleMainActivityPage<AddonModChatIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModChatIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModChatIndexComponent);
 
 }
diff --git a/src/addons/mod/choice/pages/index/index.ts b/src/addons/mod/choice/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModChoiceIndexPage extends CoreCourseModuleMainActivityPage<AddonModChoiceIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModChoiceIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModChoiceIndexComponent);
 
 }
diff --git a/src/addons/mod/data/pages/edit/edit.ts b/src/addons/mod/data/pages/edit/edit.ts
@@ -64,8 +64,8 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModDataEditPage implements OnInit {
 
-    readonly content = viewChild(IonContent);
-    readonly formElement = viewChild.required<ElementRef>('editFormEl');
+    readonly content = viewChild.required(IonContent);
+    readonly formElement = viewChild<ElementRef>('editFormEl');
 
     protected entryId?: number;
     protected fieldsArray: AddonModDataField[] = [];
@@ -552,9 +552,9 @@ export default class AddonModDataEditPage implements OnInit {
      * Scroll to first error or to the top if not found.
      */
     protected async scrollToFirstError(): Promise<void> {
-        const scrolled = await CoreDom.scrollToElement(this.formElement().nativeElement, '.addon-data-error');
+        const scrolled = await CoreDom.scrollToElement(this.formElement()?.nativeElement, '.addon-data-error');
         if (!scrolled) {
-            this.content()?.scrollToTop();
+            this.content().scrollToTop();
         }
     }
 
diff --git a/src/addons/mod/data/pages/entry/entry.ts b/src/addons/mod/data/pages/entry/entry.ts
@@ -67,7 +67,7 @@ import { CoreRatingAggregateComponent } from '@features/rating/components/aggreg
 })
 export default class AddonModDataEntryPage implements OnInit, OnDestroy {
 
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
     readonly comments = viewChild(CoreCommentsCommentsComponent);
 
     protected entryId?: number;
@@ -250,7 +250,7 @@ export default class AddonModDataEntryPage implements OnInit, OnDestroy {
 
             CoreAlerts.showError(error, { default: Translate.instant('core.course.errorgetmodule') });
         } finally {
-            this.content()?.scrollToTop();
+            this.content().scrollToTop();
             this.entryLoaded = true;
         }
     }
diff --git a/src/addons/mod/data/pages/index/index.ts b/src/addons/mod/data/pages/index/index.ts
@@ -31,7 +31,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModDataIndexPage extends CoreCourseModuleMainActivityPage<AddonModDataIndexComponent> implements OnInit {
 
-    readonly activityComponent = viewChild(AddonModDataIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModDataIndexComponent);
 
     group = 0;
 
diff --git a/src/addons/mod/feedback/pages/form/form.ts b/src/addons/mod/feedback/pages/form/form.ts
@@ -62,7 +62,7 @@ import { CoreContentLinksHelper } from '@features/contentlinks/services/contentl
 })
 export default class AddonModFeedbackFormPage implements OnInit, CanLeave {
 
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
 
     protected module?: CoreCourseModuleData;
     protected currentPage?: number;
@@ -340,7 +340,7 @@ export default class AddonModFeedbackFormPage implements OnInit, CanLeave {
             return;
         }
 
-        this.content()?.scrollToTop();
+        this.content().scrollToTop();
         this.feedbackLoaded = false;
 
         const responses = AddonModFeedbackHelper.getPageItemsResponses(this.items);
diff --git a/src/addons/mod/feedback/pages/index/index.ts b/src/addons/mod/feedback/pages/index/index.ts
@@ -33,7 +33,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 export default class AddonModFeedbackIndexPage extends CoreCourseModuleMainActivityPage<AddonModFeedbackIndexComponent>
     implements OnInit {
 
-    readonly activityComponent = viewChild(AddonModFeedbackIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModFeedbackIndexComponent);
 
     selectedTab?: AddonModFeedbackIndexTabName;
     selectedGroup?: number;
diff --git a/src/addons/mod/folder/pages/index/index.ts b/src/addons/mod/folder/pages/index/index.ts
@@ -34,7 +34,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 export default class AddonModFolderIndexPage extends CoreCourseModuleMainActivityPage<AddonModFolderIndexComponent>
     implements OnInit {
 
-    readonly activityComponent = viewChild(AddonModFolderIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModFolderIndexComponent);
 
     folderInstance?: AddonModFolderFolder;
     subfolder?: AddonModFolderFolderFormattedData;
diff --git a/src/addons/mod/forum/pages/index/index.ts b/src/addons/mod/forum/pages/index/index.ts
@@ -28,6 +28,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModForumIndexPage extends CoreCourseModuleMainActivityPage<AddonModForumIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModForumIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModForumIndexComponent);
 
 }
diff --git a/src/addons/mod/forum/pages/new-discussion/new-discussion.ts b/src/addons/mod/forum/pages/new-discussion/new-discussion.ts
@@ -81,8 +81,8 @@ type NewDiscussionData = {
 })
 export default class AddonModForumNewDiscussionPage implements OnInit, OnDestroy, CanLeave {
 
-    readonly formElement = viewChild.required<ElementRef>('newDiscFormEl');
-    readonly messageEditor = viewChild.required(CoreEditorRichTextEditorComponent);
+    readonly formElement = viewChild<ElementRef>('newDiscFormEl');
+    readonly messageEditor = viewChild(CoreEditorRichTextEditorComponent);
 
     component = ADDON_MOD_FORUM_COMPONENT_LEGACY;
     messageControl = new FormControl<string | null>(null);
@@ -518,7 +518,7 @@ export default class AddonModForumNewDiscussionPage implements OnInit, OnDestroy
             this.newDiscussion.message = null;
             this.newDiscussion.files = [];
             this.newDiscussion.postToAllGroups = false;
-            this.messageEditor().clearText();
+            this.messageEditor()?.clearText();
             this.originalData = CoreUtils.clone(this.newDiscussion);
         } else {
             CoreNavigator.back();
diff --git a/src/addons/mod/glossary/pages/index/index.ts b/src/addons/mod/glossary/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModGlossaryIndexPage extends CoreCourseModuleMainActivityPage<AddonModGlossaryIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModGlossaryIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModGlossaryIndexComponent);
 
 }
diff --git a/src/addons/mod/h5pactivity/pages/index/index.ts b/src/addons/mod/h5pactivity/pages/index/index.ts
@@ -37,14 +37,14 @@ export default class AddonModH5PActivityIndexPage extends CoreCourseModuleMainAc
     canLeaveSafely = false;
     remainingTimeout?: number;
 
-    readonly activityComponent = viewChild(AddonModH5PActivityIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModH5PActivityIndexComponent);
 
     /**
      * @inheritdoc
      */
     async canLeave(): Promise<boolean> {
         const activityComponent = this.activityComponent();
-        if (!activityComponent?.playing || activityComponent.isOpeningPage || activityComponent.saveStateEnabled) {
+        if (!activityComponent.playing || activityComponent.isOpeningPage || activityComponent.saveStateEnabled) {
             return true;
         }
 
diff --git a/src/addons/mod/imscp/pages/index/index.ts b/src/addons/mod/imscp/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModImscpIndexPage extends CoreCourseModuleMainActivityPage<AddonModImscpIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModImscpIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModImscpIndexComponent);
 
 }
diff --git a/src/addons/mod/lesson/pages/index/index.ts b/src/addons/mod/lesson/pages/index/index.ts
@@ -32,7 +32,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 export default class AddonModLessonIndexPage extends CoreCourseModuleMainActivityPage<AddonModLessonIndexComponent>
     implements OnInit {
 
-    readonly activityComponent = viewChild(AddonModLessonIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModLessonIndexComponent);
 
     group?: number; // The group to display.
     action?: string; // The "action" to display first.
diff --git a/src/addons/mod/lesson/pages/player/player.ts b/src/addons/mod/lesson/pages/player/player.ts
@@ -74,7 +74,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModLessonPlayerPage implements OnInit, OnDestroy, CanLeave {
 
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
     readonly formElement = viewChild<ElementRef>('questionFormEl');
 
     component = ADDON_MOD_LESSON_COMPONENT_LEGACY;
diff --git a/src/addons/mod/lti/pages/index/index.ts b/src/addons/mod/lti/pages/index/index.ts
@@ -31,6 +31,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModLtiIndexPage extends CoreCourseModuleMainActivityPage<AddonModLtiIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModLtiIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModLtiIndexComponent);
 
 }
diff --git a/src/addons/mod/page/pages/index/index.ts b/src/addons/mod/page/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModPageIndexPage extends CoreCourseModuleMainActivityPage<AddonModPageIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModPageIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModPageIndexComponent);
 
 }
diff --git a/src/addons/mod/quiz/pages/index/index.ts b/src/addons/mod/quiz/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModQuizIndexPage extends CoreCourseModuleMainActivityPage<AddonModQuizIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModQuizIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModQuizIndexComponent);
 
 }
diff --git a/src/addons/mod/quiz/pages/player/player.ts b/src/addons/mod/quiz/pages/player/player.ts
@@ -87,7 +87,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModQuizPlayerPage implements OnInit, OnDestroy, CanLeave {
 
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
     readonly questionComponents = viewChildren(CoreQuestionComponent);
     readonly formElement = viewChild<ElementRef>('quizForm');
 
@@ -264,7 +264,7 @@ export default class AddonModQuizPlayerPage implements OnInit, OnDestroy, CanLea
                 if (scrollTop != -1) {
                     // Wait for content to be rendered.
                     setTimeout(() => {
-                        this.content()?.scrollToPoint(0, scrollTop);
+                        this.content().scrollToPoint(0, scrollTop);
                     }, 50);
                 }
             }
@@ -308,7 +308,7 @@ export default class AddonModQuizPlayerPage implements OnInit, OnDestroy, CanLea
             return;
         }
 
-        this.content()?.scrollToTop();
+        this.content().scrollToTop();
 
         // First try to save the attempt data. We only save it if we're not seeing the summary.
         if (!this.showSummary) {
diff --git a/src/addons/mod/quiz/pages/review/review.ts b/src/addons/mod/quiz/pages/review/review.ts
@@ -59,7 +59,7 @@ import { CoreLoadings } from '@services/overlays/loadings';
 })
 export default class AddonModQuizReviewPage implements OnInit {
 
-    readonly content = viewChild(IonContent);
+    readonly content = viewChild.required(IonContent);
 
     protected static readonly QUESTIONS_PER_LOAD_WHEN_SHOW_ALL = 10;
 
@@ -138,7 +138,7 @@ export default class AddonModQuizReviewPage implements OnInit {
         }
 
         this.loaded = false;
-        this.content()?.scrollToTop();
+        this.content().scrollToTop();
 
         try {
             await this.loadPage(page);
diff --git a/src/addons/mod/resource/pages/index/index.ts b/src/addons/mod/resource/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModResourceIndexPage extends CoreCourseModuleMainActivityPage<AddonModResourceIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModResourceIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModResourceIndexComponent);
 
 }
diff --git a/src/addons/mod/scorm/pages/index/index.ts b/src/addons/mod/scorm/pages/index/index.ts
@@ -32,7 +32,7 @@ import { CoreSharedModule } from '@/core/shared.module';
 export default class AddonModScormIndexPage extends CoreCourseModuleMainActivityPage<AddonModScormIndexComponent>
     implements OnInit {
 
-    readonly activityComponent = viewChild(AddonModScormIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModScormIndexComponent);
 
     autoPlayData?: AddonModScormAutoPlayData; // Data to auto-play the SCORM.
 
diff --git a/src/addons/mod/survey/pages/index/index.ts b/src/addons/mod/survey/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModSurveyIndexPage extends CoreCourseModuleMainActivityPage<AddonModSurveyIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModSurveyIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModSurveyIndexComponent);
 
 }
diff --git a/src/addons/mod/url/pages/index/index.ts b/src/addons/mod/url/pages/index/index.ts
@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';
 })
 export default class AddonModUrlIndexPage extends CoreCourseModuleMainActivityPage<AddonModUrlIndexComponent> {
 
-    readonly activityComponent = viewChild(AddonModUrlIndexComponent);
+    readonly activityComponent = viewChild.required(AddonModUrlIndexComponent);
 
 }
diff --git a/src/addons/mod/wiki/pages/index/index.ts b/src/addons/mod/wiki/pages/index/index.ts
diff --git a/src/addons/mod/workshop/pages/assessment/assessment.ts b/src/addons/mod/workshop/pages/assessment/assessment.ts
diff --git a/src/addons/mod/workshop/pages/edit-submission/edit-submission.ts b/src/addons/mod/workshop/pages/edit-submission/edit-submission.ts
diff --git a/src/addons/mod/workshop/pages/index/index.ts b/src/addons/mod/workshop/pages/index/index.ts
diff --git a/src/addons/notes/pages/list/list.ts b/src/addons/notes/pages/list/list.ts
diff --git a/src/core/features/comments/pages/viewer/viewer.ts b/src/core/features/comments/pages/viewer/viewer.ts
diff --git a/src/core/features/course/classes/main-activity-page.ts b/src/core/features/course/classes/main-activity-page.ts
diff --git a/src/core/features/course/pages/contents/contents.ts b/src/core/features/course/pages/contents/contents.ts
diff --git a/src/core/features/policy/pages/site-policy/site-policy.ts b/src/core/features/policy/pages/site-policy/site-policy.ts

Original file line number	Diff line number	Diff line change
`@@ -73,7 +73,7 @@ const enum AddonMessagesGroupConversationOptionNames {`
`73`	`73`	`export default class AddonMessagesGroupConversationsPage implements OnInit, OnDestroy {`
`74`	`74`
`75`	`75`	`readonly splitView = viewChild.required(CoreSplitViewComponent);`
`76`		`- readonly content = viewChild(IonContent);`
	`76`	`+ readonly content = viewChild.required(IonContent);`
`77`	`77`	`readonly accordionGroup = viewChild.required<IonAccordionGroup>('accordionGroup');`
`78`	`78`
`79`	`79`	`loaded = false;`
`@@ -189,7 +189,7 @@ export default class AddonMessagesGroupConversationsPage implements OnInit, OnDe`
`189`	`189`
`190`	`190`	`if (isNewer) {`
`191`	`191`	`// The last message is newer than the previous one, scroll to top to keep viewing the conversation.`
`192`		`- this.content()?.scrollToTop();`
	`192`	`+ this.content().scrollToTop();`
`193`	`193`	`}`
`194`	`194`	`}`
`195`	`195`	`},`
Original file line number	Diff line number	Diff line change
`@@ -30,6 +30,6 @@ import { CoreSharedModule } from '@/core/shared.module';`
`30`	`30`	`})`
`31`	`31`	`export default class AddonModBBBIndexPage extends CoreCourseModuleMainActivityPage<AddonModBBBIndexComponent> {`
`32`	`32`
`33`		`- readonly activityComponent = viewChild(AddonModBBBIndexComponent);`
	`33`	`+ readonly activityComponent = viewChild.required(AddonModBBBIndexComponent);`
`34`	`34`
`35`	`35`	`}`
Original file line number	Diff line number	Diff line change
`@@ -49,7 +49,7 @@ export default class AddonModChatChatPage implements OnInit, OnDestroy, CanLeave`
`49`	`49`
`50`	`50`	`protected static readonly POLL_INTERVAL = 4000;`
`51`	`51`
`52`		`- readonly content = viewChild(IonContent);`
	`52`	`+ readonly content = viewChild.required(IonContent);`
`53`	`53`	`readonly sendMessageForm = viewChild(CoreSendMessageFormComponent);`
`54`	`54`
`55`	`55`	`loaded = false;`
`@@ -360,7 +360,7 @@ export default class AddonModChatChatPage implements OnInit, OnDestroy, CanLeave`
`360`	`360`	`// Need a timeout to leave time to the view to be rendered.`
`361`	`361`	`await CoreWait.nextTick();`
`362`	`362`	`if (!this.viewDestroyed) {`
`363`		`- this.content()?.scrollToBottom();`
	`363`	`+ this.content().scrollToBottom();`
`364`	`364`	`}`
`365`	`365`	`}`
`366`	`366`