diff --git a/src/addons/badges/services/badges.ts b/src/addons/badges/services/badges.ts
index d95e4f733..df39a9595 100644
--- a/src/addons/badges/services/badges.ts
+++ b/src/addons/badges/services/badges.ts
@@ -83,7 +83,7 @@ export class AddonBadgesProvider {
             badge.alignment = badge.alignment || badge.competencies;
 
             // Check that the alignment is valid, they were broken in 3.7.
-            if (badge.alignment && badge.alignment[0] && typeof badge.alignment[0].targetname == 'undefined') {
+            if (badge.alignment && badge.alignment[0] && badge.alignment[0].targetname === undefined) {
                 // If any badge lacks targetname it means they are affected by the Moodle bug, don't display them.
                 delete badge.alignment;
             }
diff --git a/src/addons/badges/services/handlers/user.ts b/src/addons/badges/services/handlers/user.ts
index 52e44fb69..5e3a5bc44 100644
--- a/src/addons/badges/services/handlers/user.ts
+++ b/src/addons/badges/services/handlers/user.ts
@@ -49,7 +49,7 @@ export class AddonBadgesUserHandlerService implements CoreUserProfileHandler {
         courseId: number,
         navOptions?: CoreCourseUserAdminOrNavOptionIndexed,
     ): Promise<boolean> {
-        if (navOptions && typeof navOptions.badges != 'undefined') {
+        if (navOptions && navOptions.badges !== undefined) {
             return navOptions.badges;
         }
 
diff --git a/src/addons/block/activitymodules/components/activitymodules/activitymodules.ts b/src/addons/block/activitymodules/components/activitymodules/activitymodules.ts
index fdeb9a967..60db4a0c0 100644
--- a/src/addons/block/activitymodules/components/activitymodules/activitymodules.ts
+++ b/src/addons/block/activitymodules/components/activitymodules/activitymodules.ts
@@ -67,13 +67,13 @@ export class AddonBlockActivityModulesComponent extends CoreBlockBaseComponent i
 
             section.modules.forEach((mod) => {
                 if (mod.uservisible === false || !CoreCourse.moduleHasView(mod) ||
-                    typeof modFullNames[mod.modname] != 'undefined') {
+                    modFullNames[mod.modname] !== undefined) {
                     // Ignore this module.
                     return;
                 }
 
                 // Get the archetype of the module type.
-                if (typeof archetypes[mod.modname] == 'undefined') {
+                if (archetypes[mod.modname] === undefined) {
                     archetypes[mod.modname] = CoreCourseModuleDelegate.supportsFeature<number>(
                         mod.modname,
                         CoreConstants.FEATURE_MOD_ARCHETYPE,
diff --git a/src/addons/blog/services/handlers/course-option.ts b/src/addons/blog/services/handlers/course-option.ts
index c15f4b4de..c935a221d 100644
--- a/src/addons/blog/services/handlers/course-option.ts
+++ b/src/addons/blog/services/handlers/course-option.ts
@@ -62,7 +62,7 @@ export class AddonBlogCourseOptionHandlerService implements CoreCourseOptionsHan
     ): Promise<boolean> {
         const enabled = await CoreCourseHelper.hasABlockNamed(courseId, 'blog_menu');
 
-        if (enabled && navOptions && typeof navOptions.blogs != 'undefined') {
+        if (enabled && navOptions && navOptions.blogs !== undefined) {
             return navOptions.blogs;
         }
 
diff --git a/src/addons/calendar/pages/day/day.page.ts b/src/addons/calendar/pages/day/day.page.ts
index 984d5931b..b806ed84c 100644
--- a/src/addons/calendar/pages/day/day.page.ts
+++ b/src/addons/calendar/pages/day/day.page.ts
@@ -211,7 +211,7 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
         this.filter.courseId = CoreNavigator.getRouteNumberParam('courseId');
         this.filter.categoryId = CoreNavigator.getRouteNumberParam('categoryId');
 
-        this.filter.filtered = typeof this.filter.courseId != 'undefined' || types.some((name) => !this.filter[name]);
+        this.filter.filtered = this.filter.courseId !== undefined || types.some((name) => !this.filter[name]);
 
         const month = CoreNavigator.getRouteNumberParam('month');
         const source = new AddonCalendarDaySlidesItemsManagerSource(this, moment({
diff --git a/src/addons/calendar/services/calendar.ts b/src/addons/calendar/services/calendar.ts
index 17c60c3bf..69473fb05 100644
--- a/src/addons/calendar/services/calendar.ts
+++ b/src/addons/calendar/services/calendar.ts
@@ -538,7 +538,7 @@ export class AddonCalendarProvider {
             // Ignore errors.
         }
 
-        if (typeof value == 'undefined' || value === null) {
+        if (value === undefined || value === null) {
             value = site.getStoredConfig('calendar_lookahead');
         }
 
diff --git a/src/addons/competency/pages/competencysummary/competencysummary.ts b/src/addons/competency/pages/competencysummary/competencysummary.ts
index fa810bf2b..5119dd2c8 100644
--- a/src/addons/competency/pages/competencysummary/competencysummary.ts
+++ b/src/addons/competency/pages/competencysummary/competencysummary.ts
@@ -70,7 +70,7 @@ export class AddonCompetencyCompetencySummaryPage implements OnInit {
     protected async fetchCompetency(): Promise<void> {
         try {
             const result = await AddonCompetency.getCompetencySummary(this.competencyId);
-            if (!this.contextLevel || typeof this.contextInstanceId == 'undefined') {
+            if (!this.contextLevel || this.contextInstanceId === undefined) {
                 // Context not specified, use user context.
                 this.contextLevel = ContextLevel.USER;
                 this.contextInstanceId = result.usercompetency!.userid;
diff --git a/src/addons/competency/services/handlers/course-option.ts b/src/addons/competency/services/handlers/course-option.ts
index 7051064ff..d46c2d6fa 100644
--- a/src/addons/competency/services/handlers/course-option.ts
+++ b/src/addons/competency/services/handlers/course-option.ts
@@ -55,7 +55,7 @@ export class AddonCompetencyCourseOptionHandlerService implements CoreCourseOpti
             return false; // Not enabled for guests.
         }
 
-        if (navOptions && typeof navOptions.competencies != 'undefined') {
+        if (navOptions && navOptions.competencies !== undefined) {
             return navOptions.competencies;
         }
 
@@ -83,7 +83,7 @@ export class AddonCompetencyCourseOptionHandlerService implements CoreCourseOpti
      * @inheritdoc
      */
     async invalidateEnabledForCourse(courseId: number, navOptions?: CoreCourseUserAdminOrNavOptionIndexed): Promise<void> {
-        if (navOptions && typeof navOptions.competencies != 'undefined') {
+        if (navOptions && navOptions.competencies !== undefined) {
             // No need to invalidate anything.
             return;
         }
diff --git a/src/addons/coursecompletion/services/coursecompletion.ts b/src/addons/coursecompletion/services/coursecompletion.ts
index 21898f3c6..0fa9d22ec 100644
--- a/src/addons/coursecompletion/services/coursecompletion.ts
+++ b/src/addons/coursecompletion/services/coursecompletion.ts
@@ -172,12 +172,12 @@ export class AddonCourseCompletionProvider {
         const course = await CoreCourses.getUserCourse(courseId, preferCache);
 
         if (course) {
-            if (typeof course.enablecompletion != 'undefined' && !course.enablecompletion) {
+            if (course.enablecompletion !== undefined && !course.enablecompletion) {
                 // Completion not enabled for the course.
                 return false;
             }
 
-            if (typeof course.completionhascriteria != 'undefined' && !course.completionhascriteria) {
+            if (course.completionhascriteria !== undefined && !course.completionhascriteria) {
                 // No criteria, cannot view completion.
                 return false;
             }
@@ -206,7 +206,7 @@ export class AddonCourseCompletionProvider {
 
                 // If the site is returning the completionhascriteria then the user can view his own completion.
                 // We already checked the value in isPluginViewEnabledForCourse.
-                if (course && typeof course.completionhascriteria != 'undefined') {
+                if (course && course.completionhascriteria !== undefined) {
                     return true;
                 }
             }
diff --git a/src/addons/filter/mathjaxloader/services/handlers/mathjaxloader.ts b/src/addons/filter/mathjaxloader/services/handlers/mathjaxloader.ts
index a0aab60bf..2f9ae9056 100644
--- a/src/addons/filter/mathjaxloader/services/handlers/mathjaxloader.ts
+++ b/src/addons/filter/mathjaxloader/services/handlers/mathjaxloader.ts
@@ -86,7 +86,7 @@ export class AddonFilterMathJaxLoaderHandlerService extends CoreFilterDefaultHan
 
         // Update MathJax locale if app language changes.
         CoreEvents.on(CoreEvents.LANGUAGE_CHANGED, (lang: string) => {
-            if (typeof this.window.MathJax == 'undefined') {
+            if (this.window.MathJax === undefined) {
                 return;
             }
 
@@ -223,7 +223,7 @@ export class AddonFilterMathJaxLoaderHandlerService extends CoreFilterDefaultHan
                 if (!this._configured) {
                     const lang = this._lang;
 
-                    if (typeof that.window.MathJax != 'undefined') {
+                    if (that.window.MathJax !== undefined) {
                         that.window.MathJax.Hub.Queue(() => {
                             that.window.MathJax.Localization.setLocale(lang);
                         });
@@ -238,7 +238,7 @@ export class AddonFilterMathJaxLoaderHandlerService extends CoreFilterDefaultHan
                     this._setLocale();
                 }
 
-                if (typeof that.window.MathJax != 'undefined') {
+                if (that.window.MathJax !== undefined) {
                     const processDelay = that.window.MathJax.Hub.processSectionDelay;
                     // Set the process section delay to 0 when updating the formula.
                     that.window.MathJax.Hub.processSectionDelay = 0;
diff --git a/src/addons/messages/pages/discussion/discussion.page.ts b/src/addons/messages/pages/discussion/discussion.page.ts
index ca9028029..7c4176af1 100644
--- a/src/addons/messages/pages/discussion/discussion.page.ts
+++ b/src/addons/messages/pages/discussion/discussion.page.ts
@@ -205,7 +205,7 @@ export class AddonMessagesDiscussionPage implements OnInit, OnDestroy, AfterView
                 message.useridfrom;
 
         let added = false;
-        if (typeof this.keepMessageMap[message.hash] === 'undefined') {
+        if (this.keepMessageMap[message.hash] === undefined) {
             // Message not added to the list. Add it now.
             this.messages.push(message);
             added = message.useridfrom != this.currentUserId;
@@ -1277,7 +1277,7 @@ export class AddonMessagesDiscussionPage implements OnInit, OnDestroy, AfterView
                 },
             });
 
-            if (typeof userId != 'undefined') {
+            if (userId !== undefined) {
                 const splitViewLoaded = CoreNavigator.isCurrentPathInTablet('**/messages/**/discussion');
 
                 // Open user conversation.
diff --git a/src/addons/messages/pages/discussions-35/discussions.page.ts b/src/addons/messages/pages/discussions-35/discussions.page.ts
index 5c904cbae..ad60b73e9 100644
--- a/src/addons/messages/pages/discussions-35/discussions.page.ts
+++ b/src/addons/messages/pages/discussions-35/discussions.page.ts
@@ -77,7 +77,7 @@ export class AddonMessagesDiscussions35Page implements OnInit, OnDestroy {
                 if (data.userId && this.discussions) {
                     const discussion = this.discussions.find((disc) => disc.message!.user == data.userId);
 
-                    if (typeof discussion == 'undefined') {
+                    if (discussion === undefined) {
                         this.loaded = false;
                         this.refreshData().finally(() => {
                             this.loaded = true;
@@ -99,7 +99,7 @@ export class AddonMessagesDiscussions35Page implements OnInit, OnDestroy {
                 if (data.userId && this.discussions) {
                     const discussion = this.discussions.find((disc) => disc.message!.user == data.userId);
 
-                    if (typeof discussion != 'undefined') {
+                    if (discussion !== undefined) {
                     // A discussion has been read reset counter.
                         discussion.unread = false;
 
diff --git a/src/addons/messages/pages/group-conversations/group-conversations.page.ts b/src/addons/messages/pages/group-conversations/group-conversations.page.ts
index f4d884458..47d6ba354 100644
--- a/src/addons/messages/pages/group-conversations/group-conversations.page.ts
+++ b/src/addons/messages/pages/group-conversations/group-conversations.page.ts
@@ -118,7 +118,7 @@ export class AddonMessagesGroupConversationsPage implements OnInit, OnDestroy {
                 // Search the conversation to update.
                 const conversation = this.findConversation(data.conversationId, data.userId, expandedOption);
 
-                if (typeof conversation == 'undefined') {
+                if (conversation === undefined) {
                 // Probably a new conversation, refresh the list.
                     this.loaded = false;
                     this.refreshData().finally(() => {
@@ -152,7 +152,7 @@ export class AddonMessagesGroupConversationsPage implements OnInit, OnDestroy {
             if (data.conversationId) {
                 const conversation = this.findConversation(data.conversationId);
 
-                if (typeof conversation != 'undefined') {
+                if (conversation !== undefined) {
                     // A conversation has been read reset counter.
                     conversation.unreadcount = 0;
 
@@ -318,7 +318,7 @@ export class AddonMessagesGroupConversationsPage implements OnInit, OnDestroy {
             await Promise.all(promises);
 
             // The expanded status hasn't been initialized. Do it now.
-            if (typeof this.favourites.expanded == 'undefined' && (this.selectedConversationId || this.selectedUserId)) {
+            if (this.favourites.expanded === undefined && (this.selectedConversationId || this.selectedUserId)) {
                 // A certain conversation should be opened.
                 // We don't know which option it belongs to, so we need to fetch the data for all of them.
                 const promises: Promise<void>[] = [];
@@ -355,7 +355,7 @@ export class AddonMessagesGroupConversationsPage implements OnInit, OnDestroy {
      * @return Promise resolved when done.
      */
     protected async fetchDataForExpandedOption(): Promise<void> {
-        if (typeof this.favourites.expanded == 'undefined') {
+        if (this.favourites.expanded === undefined) {
             // Calculate which option should be expanded initially.
             this.favourites.expanded = this.favourites.count != 0 && !this.group.unread && !this.individual.unread;
             this.group.expanded = !this.favourites.expanded && this.group.count != 0 && !this.individual.unread;
@@ -572,7 +572,7 @@ export class AddonMessagesGroupConversationsPage implements OnInit, OnDestroy {
 
                 if (conversation) {
                     // Check if it's the last message. Offline messages are considered more recent than sent messages.
-                    if (typeof conversation.lastmessage === 'undefined' || conversation.lastmessage === null ||
+                    if (conversation.lastmessage === undefined || conversation.lastmessage === null ||
                             !conversation.lastmessagepending || (conversation.lastmessagedate || 0) <= message.timecreated / 1000) {
 
                         this.addLastOfflineMessage(conversation, message);
diff --git a/src/addons/messages/services/handlers/discussion-link.ts b/src/addons/messages/services/handlers/discussion-link.ts
index b0fae3fce..2eb03cdec 100644
--- a/src/addons/messages/services/handlers/discussion-link.ts
+++ b/src/addons/messages/services/handlers/discussion-link.ts
@@ -69,12 +69,12 @@ export class AddonMessagesDiscussionLinkHandlerService extends CoreContentLinksH
             return false;
         }
 
-        if (typeof params.id == 'undefined' && typeof params.user2 == 'undefined') {
+        if (params.id === undefined && params.user2 === undefined) {
             // Other user not defined, cannot treat the URL.
             return false;
         }
 
-        if (typeof params.user1 != 'undefined') {
+        if (params.user1 !== undefined) {
             // Check if user1 is the current user, since the app only supports current user.
             const site = await CoreSites.getSite(siteId);
 
diff --git a/src/addons/messages/services/messages-sync.ts b/src/addons/messages/services/messages-sync.ts
index cdcc4dd6c..64edaf6df 100644
--- a/src/addons/messages/services/messages-sync.ts
+++ b/src/addons/messages/services/messages-sync.ts
@@ -107,7 +107,7 @@ export class AddonMessagesSyncProvider extends CoreSyncBaseProvider<AddonMessage
         // Sync all conversations.
         conversationIds.forEach((conversationId) => {
             promises.push(this.syncDiscussion(conversationId, undefined, siteId).then((result) => {
-                if (typeof result == 'undefined') {
+                if (result === undefined) {
                     return;
                 }
 
@@ -120,7 +120,7 @@ export class AddonMessagesSyncProvider extends CoreSyncBaseProvider<AddonMessage
 
         userIds.forEach((userId) => {
             promises.push(this.syncDiscussion(undefined, userId, siteId).then((result) => {
-                if (typeof result == 'undefined') {
+                if (result === undefined) {
                     return;
                 }
 
diff --git a/src/addons/messages/services/messages.ts b/src/addons/messages/services/messages.ts
index 1498691b6..ba07393c5 100644
--- a/src/addons/messages/services/messages.ts
+++ b/src/addons/messages/services/messages.ts
@@ -317,7 +317,7 @@ export class AddonMessagesProvider {
             userid: userId,
         };
 
-        if (typeof read != 'undefined') {
+        if (read !== undefined) {
             params.read = read;
         }
 
@@ -1075,10 +1075,10 @@ export class AddonMessagesProvider {
             preSets.getFromCache = false;
             preSets.emergencyCache = false;
         }
-        if (typeof type != 'undefined' && type != null) {
+        if (type !== undefined && type != null) {
             params.type = type;
         }
-        if (typeof favourites != 'undefined' && favourites != null) {
+        if (favourites !== undefined && favourites != null) {
             params.favourites = !!favourites;
         }
         if (site.isVersionGreaterEqualThan('3.7') && type != AddonMessagesProvider.MESSAGE_CONVERSATION_TYPE_GROUP) {
@@ -1244,7 +1244,7 @@ export class AddonMessagesProvider {
             userId: number,
             userFullname: string,
         ): void => {
-            if (typeof discussions[userId] === 'undefined') {
+            if (discussions[userId] === undefined) {
                 discussions[userId] = {
                     fullname: userFullname,
                     profileimageurl: '',
@@ -1259,7 +1259,7 @@ export class AddonMessagesProvider {
 
             // Extract the most recent message. Pending messages are considered more recent than messages already sent.
             const discMessage = discussions[userId].message;
-            if (typeof discMessage === 'undefined' || (!discMessage.pending && message.pending) ||
+            if (discMessage === undefined || (!discMessage.pending && message.pending) ||
                 (discMessage.pending == message.pending && (discMessage.timecreated < message.timecreated ||
                     (discMessage.timecreated == message.timecreated && discMessage.id < messageId)))) {
 
@@ -2646,7 +2646,7 @@ export class AddonMessagesProvider {
             conversationid: conversationId,
             messages: messages.map((message) => ({
                 text: message.text,
-                textformat: typeof message.textformat != 'undefined' ? message.textformat : 1,
+                textformat: message.textformat !== undefined ? message.textformat : 1,
             })),
         };
 
diff --git a/src/addons/mod/assign/classes/base-feedback-plugin-component.ts b/src/addons/mod/assign/classes/base-feedback-plugin-component.ts
index b44226f47..2bc825f83 100644
--- a/src/addons/mod/assign/classes/base-feedback-plugin-component.ts
+++ b/src/addons/mod/assign/classes/base-feedback-plugin-component.ts
@@ -57,7 +57,7 @@ export class AddonModAssignFeedbackPluginBaseComponent {
             },
         });
 
-        if (typeof modalData == 'undefined') {
+        if (modalData === undefined) {
             throw new CoreCanceledError(); // User cancelled.
         }
 
diff --git a/src/addons/mod/assign/components/index/index.ts b/src/addons/mod/assign/components/index/index.ts
index 80a089d2b..0aa2a9a8e 100644
--- a/src/addons/mod/assign/components/index/index.ts
+++ b/src/addons/mod/assign/components/index/index.ts
@@ -304,7 +304,7 @@ export class AddonModAssignIndexComponent extends CoreCourseModuleMainActivityCo
      * @param hasSubmissions If the status has any submission.
      */
     goToSubmissionList(status?: string, hasSubmissions = false): void {
-        if (typeof status != 'undefined' && !hasSubmissions) {
+        if (status !== undefined && !hasSubmissions) {
             return;
         }
 
@@ -312,7 +312,7 @@ export class AddonModAssignIndexComponent extends CoreCourseModuleMainActivityCo
             groupId: this.group || 0,
             moduleName: this.moduleName,
         };
-        if (typeof status != 'undefined') {
+        if (status !== undefined) {
             params.status = status;
         }
 
diff --git a/src/addons/mod/assign/components/submission/submission.ts b/src/addons/mod/assign/components/submission/submission.ts
index 4256c120a..5b7b69785 100644
--- a/src/addons/mod/assign/components/submission/submission.ts
+++ b/src/addons/mod/assign/components/submission/submission.ts
@@ -380,7 +380,7 @@ export class AddonModAssignSubmissionComponent implements OnInit, OnDestroy, Can
             for (const x in this.gradeInfo.outcomes) {
                 const outcome = this.gradeInfo.outcomes[x];
 
-                if (this.originalGrades.outcomes[outcome.id] == 'undefined' ||
+                if (this.originalGrades.outcomes[outcome.id] === undefined ||
                         this.originalGrades.outcomes[outcome.id] != outcome.selectedId) {
                     return true;
                 }
@@ -726,7 +726,7 @@ export class AddonModAssignSubmissionComponent implements OnInit, OnDestroy, Can
 
             if (submissionGrade.outcomes && Object.keys(submissionGrade.outcomes).length && this.gradeInfo?.outcomes) {
                 this.gradeInfo.outcomes.forEach((outcome) => {
-                    if (typeof submissionGrade.outcomes[outcome.itemNumber!] != 'undefined') {
+                    if (submissionGrade.outcomes[outcome.itemNumber!] !== undefined) {
                         // If outcome has been modified from gradebook, do not use offline.
                         if (outcome.modified! < submissionGrade.timemodified) {
                             outcome.selectedId = submissionGrade.outcomes[outcome.itemNumber!];
@@ -944,7 +944,7 @@ export class AddonModAssignSubmissionComponent implements OnInit, OnDestroy, Can
 
         // Check if grading method is simple or not.
         if (this.gradeInfo.advancedgrading && this.gradeInfo.advancedgrading[0] &&
-                typeof this.gradeInfo.advancedgrading[0].method != 'undefined') {
+                this.gradeInfo.advancedgrading[0].method !== undefined) {
             this.grade.method = this.gradeInfo.advancedgrading[0].method || 'simple';
         } else {
             this.grade.method = 'simple';
@@ -1039,7 +1039,7 @@ export class AddonModAssignSubmissionComponent implements OnInit, OnDestroy, Can
         }
 
         const submissionStatementMissing = !!this.assign!.requiresubmissionstatement &&
-            typeof this.assign!.submissionstatement == 'undefined';
+            this.assign!.submissionstatement === undefined;
 
         this.canSubmit = !this.isSubmittedForGrading && !this.submittedOffline && (submissionStatus.lastattempt.cansubmit ||
             (this.hasOffline && AddonModAssign.canSubmitOffline(this.assign!, submissionStatus)));
diff --git a/src/addons/mod/assign/feedback/comments/services/handler.ts b/src/addons/mod/assign/feedback/comments/services/handler.ts
index 1b288988c..02a8bc342 100644
--- a/src/addons/mod/assign/feedback/comments/services/handler.ts
+++ b/src/addons/mod/assign/feedback/comments/services/handler.ts
@@ -69,7 +69,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
      */
     discardDraft(assignId: number, userId: number, siteId?: string): void {
         const id = this.getDraftId(assignId, userId, siteId);
-        if (typeof this.drafts[id] != 'undefined') {
+        if (this.drafts[id] !== undefined) {
             delete this.drafts[id];
         }
     }
@@ -95,7 +95,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     getDraft(assignId: number, userId: number, siteId?: string): AddonModAssignFeedbackCommentsDraftData | undefined {
         const id = this.getDraftId(assignId, userId, siteId);
 
-        if (typeof this.drafts[id] != 'undefined') {
+        if (this.drafts[id] !== undefined) {
             return this.drafts[id];
         }
     }
@@ -164,7 +164,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
         const initialText = AddonModAssign.getSubmissionPluginText(plugin);
         const newText = AddonModAssignFeedbackCommentsHandler.getTextFromInputData(plugin, inputData);
 
-        if (typeof newText == 'undefined') {
+        if (newText === undefined) {
             return false;
         }
 
diff --git a/src/addons/mod/assign/pages/submission-review/submission-review.ts b/src/addons/mod/assign/pages/submission-review/submission-review.ts
index 20342ef15..a51cf4bc4 100644
--- a/src/addons/mod/assign/pages/submission-review/submission-review.ts
+++ b/src/addons/mod/assign/pages/submission-review/submission-review.ts
@@ -142,7 +142,7 @@ export class AddonModAssignSubmissionReviewPage implements OnInit, OnDestroy, Ca
 
         // Grades can be saved if simple grading.
         if (gradeInfo.advancedgrading && gradeInfo.advancedgrading[0] &&
-                typeof gradeInfo.advancedgrading[0].method != 'undefined') {
+                gradeInfo.advancedgrading[0].method !== undefined) {
 
             const method = gradeInfo.advancedgrading[0].method || 'simple';
             this.canSaveGrades = method == 'simple';
diff --git a/src/addons/mod/assign/services/assign-helper.ts b/src/addons/mod/assign/services/assign-helper.ts
index 739c93d47..680bfbdaa 100644
--- a/src/addons/mod/assign/services/assign-helper.ts
+++ b/src/addons/mod/assign/services/assign-helper.ts
@@ -406,7 +406,7 @@ export class AddonModAssignHelperProvider {
 
         submissions.forEach((submission) => {
             submission.submitid = submission.userid && submission.userid > 0 ? submission.userid : submission.blindid;
-            if (typeof submission.submitid == 'undefined' || submission.submitid <= 0) {
+            if (submission.submitid === undefined || submission.submitid <= 0) {
                 return;
             }
 
diff --git a/src/addons/mod/book/services/book.ts b/src/addons/mod/book/services/book.ts
index 9cd689d84..1efa28d21 100644
--- a/src/addons/mod/book/services/book.ts
+++ b/src/addons/mod/book/services/book.ts
@@ -223,7 +223,7 @@ export class AddonModBookProvider {
      * @return The toc.
      */
     getToc(contents: CoreCourseModuleContentFile[]): AddonModBookTocChapterParsed[] {
-        if (!contents || !contents.length || typeof contents[0].content == 'undefined') {
+        if (!contents || !contents.length || contents[0].content === undefined) {
             return [];
         }
 
diff --git a/src/addons/mod/data/components/index/index.ts b/src/addons/mod/data/components/index/index.ts
index adec614b3..df7ca92aa 100644
--- a/src/addons/mod/data/components/index/index.ts
+++ b/src/addons/mod/data/components/index/index.ts
@@ -191,7 +191,7 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
      * @return True if refresh is needed, false otherwise.
      */
     protected isRefreshSyncNeeded(syncEventData: AddonModDataAutoSyncData): boolean {
-        if (this.database && syncEventData.dataId == this.database.id && typeof syncEventData.entryId == 'undefined') {
+        if (this.database && syncEventData.dataId == this.database.id && syncEventData.entryId === undefined) {
             this.loaded = false;
             // Refresh the data.
             this.content?.scrollToTop();
@@ -309,7 +309,7 @@ export class AddonModDataIndexComponent extends CoreCourseModuleMainActivityComp
 
         this.entriesRendered = '';
 
-        this.foundRecordsTranslationData = typeof entries.maxcount != 'undefined'
+        this.foundRecordsTranslationData = entries.maxcount !== undefined
             ? {
                 num: entries.totalcount,
                 max: entries.maxcount,
diff --git a/src/addons/mod/data/components/search/search.ts b/src/addons/mod/data/components/search/search.ts
index 4221b769a..42fbd7e54 100644
--- a/src/addons/mod/data/components/search/search.ts
+++ b/src/addons/mod/data/components/search/search.ts
@@ -69,7 +69,7 @@ export class AddonModDataSearchComponent implements OnInit {
     ngOnInit(): void {
         this.advancedIndexed = {};
         this.search.advanced?.forEach((field) => {
-            if (typeof field != 'undefined') {
+            if (field !== undefined) {
                 this.advancedIndexed[field.name] = field.value
                     ? CoreTextUtils.parseJSON(field.value, '')
                     : '';
diff --git a/src/addons/mod/data/fields/latlong/component/latlong.ts b/src/addons/mod/data/fields/latlong/component/latlong.ts
index a638544e4..87f1634d7 100644
--- a/src/addons/mod/data/fields/latlong/component/latlong.ts
+++ b/src/addons/mod/data/fields/latlong/component/latlong.ts
@@ -48,7 +48,7 @@ export class AddonModDataFieldLatlongComponent extends AddonModDataFieldPluginCo
      * @return Readable Latitude and logitude.
      */
     formatLatLong(north?: number, east?: number): string {
-        if (typeof north !== 'undefined' || typeof east !== 'undefined') {
+        if (north !== undefined || east !== undefined) {
             north = north || 0;
             east = east || 0;
             const northFixed = Math.abs(north).toFixed(4);
@@ -69,7 +69,7 @@ export class AddonModDataFieldLatlongComponent extends AddonModDataFieldPluginCo
      */
     getLatLongLink(north?: number, east?: number): SafeUrl {
         let url = '';
-        if (typeof north !== 'undefined' || typeof east !== 'undefined') {
+        if (north !== undefined || east !== undefined) {
             const northFixed = north ? north.toFixed(4) : '0.0000';
             const eastFixed = east ? east.toFixed(4) : '0.0000';
 
diff --git a/src/addons/mod/data/fields/latlong/services/handler.ts b/src/addons/mod/data/fields/latlong/services/handler.ts
index 4eed24cc1..03ab0a829 100644
--- a/src/addons/mod/data/fields/latlong/services/handler.ts
+++ b/src/addons/mod/data/fields/latlong/services/handler.ts
@@ -104,7 +104,7 @@ export class AddonModDataFieldLatlongHandlerService implements AddonModDataField
 
         // The lat long class has two values that need to be checked.
         inputData.forEach((value) => {
-            if (typeof value.value != 'undefined' && value.value != '') {
+            if (value.value !== undefined && value.value != '') {
                 valueCount++;
             }
         });
diff --git a/src/addons/mod/data/fields/picture/services/handler.ts b/src/addons/mod/data/fields/picture/services/handler.ts
index d0b503c13..d6e4dd4a5 100644
--- a/src/addons/mod/data/fields/picture/services/handler.ts
+++ b/src/addons/mod/data/fields/picture/services/handler.ts
@@ -135,7 +135,7 @@ export class AddonModDataFieldPictureHandlerService implements AddonModDataField
         }
 
         const found = inputData.some((input) => {
-            if (typeof input.subfield != 'undefined' && input.subfield == 'file') {
+            if (input.subfield !== undefined && input.subfield == 'file') {
                 return !!input.value;
             }
 
diff --git a/src/addons/mod/data/pages/edit/edit.ts b/src/addons/mod/data/pages/edit/edit.ts
index 5af31f6ed..74f60c73f 100644
--- a/src/addons/mod/data/pages/edit/edit.ts
+++ b/src/addons/mod/data/pages/edit/edit.ts
@@ -110,7 +110,7 @@ export class AddonModDataEditPage implements OnInit {
         }
 
         // If entryId is lower than 0 or null, it is a new entry or an offline entry.
-        this.isEditing = typeof this.entryId != 'undefined' && this.entryId > 0;
+        this.isEditing = this.entryId !== undefined && this.entryId > 0;
 
         this.title = this.module.name;
 
diff --git a/src/addons/mod/data/pages/entry/entry.ts b/src/addons/mod/data/pages/entry/entry.ts
index 95e37b326..df8ebb5be 100644
--- a/src/addons/mod/data/pages/entry/entry.ts
+++ b/src/addons/mod/data/pages/entry/entry.ts
@@ -98,7 +98,7 @@ export class AddonModDataEntryPage implements OnInit, OnDestroy {
 
         // Refresh data if this discussion is synchronized automatically.
         this.syncObserver = CoreEvents.on(AddonModDataSyncProvider.AUTO_SYNCED, (data) => {
-            if (typeof data.entryId == 'undefined') {
+            if (data.entryId === undefined) {
                 return;
             }
 
@@ -299,7 +299,7 @@ export class AddonModDataEntryPage implements OnInit, OnDestroy {
      * @return Resolved when done.
      */
     protected async setEntryFromOffset(): Promise<void> {
-        if (typeof this.offset == 'undefined' && typeof this.entryId != 'undefined') {
+        if (this.offset === undefined && this.entryId !== undefined) {
             // Entry id passed as navigation parameter instead of the offset.
             // We don't display next/previous buttons in this case.
             this.hasNext = false;
@@ -313,7 +313,7 @@ export class AddonModDataEntryPage implements OnInit, OnDestroy {
         }
 
         const perPage = AddonModDataProvider.PER_PAGE;
-        const page = typeof this.offset != 'undefined' && this.offset >= 0
+        const page = this.offset !== undefined && this.offset >= 0
             ? Math.floor(this.offset / perPage)
             : 0;
 
@@ -329,7 +329,7 @@ export class AddonModDataEntryPage implements OnInit, OnDestroy {
 
         // Index of the entry when concatenating offline and online page entries.
         let pageIndex = 0;
-        if (typeof this.offset == 'undefined') {
+        if (this.offset === undefined) {
             // No offset passed, display the first entry.
             pageIndex = 0;
         } else if (this.offset > 0) {
diff --git a/src/addons/mod/data/services/data-helper.ts b/src/addons/mod/data/services/data-helper.ts
index 869f2be38..18fa06b70 100644
--- a/src/addons/mod/data/services/data-helper.ts
+++ b/src/addons/mod/data/services/data-helper.ts
@@ -86,7 +86,7 @@ export class AddonModDataHelperProvider {
                     record.groupid = action.groupid;
 
                     action.fields.forEach((offlineContent) => {
-                        if (typeof offlineContents[offlineContent.fieldid] == 'undefined') {
+                        if (offlineContents[offlineContent.fieldid] === undefined) {
                             offlineContents[offlineContent.fieldid] = {};
                         }
 
@@ -270,7 +270,7 @@ export class AddonModDataHelperProvider {
             result.hasOfflineActions = !!actions.length;
 
             actions.forEach((action) => {
-                if (typeof offlineActions[action.entryid] == 'undefined') {
+                if (offlineActions[action.entryid] === undefined) {
                     offlineActions[action.entryid] = [];
                 }
                 offlineActions[action.entryid].push(action);
diff --git a/src/addons/mod/data/services/data-offline.ts b/src/addons/mod/data/services/data-offline.ts
index 19d8638fe..67fdb5b78 100644
--- a/src/addons/mod/data/services/data-offline.ts
+++ b/src/addons/mod/data/services/data-offline.ts
@@ -262,7 +262,7 @@ export class AddonModDataOfflineProvider {
         const site = await CoreSites.getSite(siteId);
 
         timemodified = timemodified || new Date().getTime();
-        entryId = typeof entryId == 'undefined' || entryId === null ? -timemodified : entryId;
+        entryId = entryId === undefined || entryId === null ? -timemodified : entryId;
 
         const entry: AddonModDataEntryDBRecord = {
             dataid: dataId,
diff --git a/src/addons/mod/data/services/data-sync.ts b/src/addons/mod/data/services/data-sync.ts
index 9a947ffcb..1549bf5f9 100644
--- a/src/addons/mod/data/services/data-sync.ts
+++ b/src/addons/mod/data/services/data-sync.ts
@@ -197,7 +197,7 @@ export class AddonModDataSyncProvider extends CoreCourseActivitySyncBaseProvider
         const offlineEntries: Record<number, AddonModDataOfflineAction[]> = {};
 
         offlineActions.forEach((entry) => {
-            if (typeof offlineEntries[entry.entryid] == 'undefined') {
+            if (offlineEntries[entry.entryid] === undefined) {
                 offlineEntries[entry.entryid] = [];
             }
 
diff --git a/src/addons/mod/data/services/data.ts b/src/addons/mod/data/services/data.ts
index 4dd6ce8e8..8c7e4e993 100644
--- a/src/addons/mod/data/services/data.ts
+++ b/src/addons/mod/data/services/data.ts
@@ -188,7 +188,7 @@ export class AddonModDataProvider {
             data,
         };
 
-        if (typeof groupId !== 'undefined') {
+        if (groupId !== undefined) {
             params.groupid = groupId;
         }
 
@@ -1004,16 +1004,16 @@ export class AddonModDataProvider {
             componentId: options.cmId,
             ...CoreSites.getReadingStrategyPreSets(options.readingStrategy), // Include reading strategy preSets.
         };
-        if (typeof options.sort != 'undefined') {
+        if (options.sort !== undefined) {
             params.sort = options.sort;
         }
-        if (typeof options.order !== 'undefined') {
+        if (options.order !== undefined) {
             params.order = options.order;
         }
-        if (typeof options.search !== 'undefined') {
+        if (options.search !== undefined) {
             params.search = options.search;
         }
-        if (typeof options.advSearch !== 'undefined') {
+        if (options.advSearch !== undefined) {
             params.advsearch = options.advSearch;
         }
         const response = await site.read<AddonModDataSearchEntriesWSResponse>('mod_data_search_entries', params, preSets);
diff --git a/src/addons/mod/data/services/handlers/approve-link.ts b/src/addons/mod/data/services/handlers/approve-link.ts
index 5d3072634..f6802bca2 100644
--- a/src/addons/mod/data/services/handlers/approve-link.ts
+++ b/src/addons/mod/data/services/handlers/approve-link.ts
@@ -50,7 +50,7 @@ export class AddonModDataApproveLinkHandlerService extends CoreContentLinksHandl
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Params): Promise<boolean> {
-        if (typeof params.d == 'undefined' || (typeof params.approve == 'undefined' && typeof params.disapprove == 'undefined')) {
+        if (params.d === undefined || (params.approve === undefined && params.disapprove === undefined)) {
             // Required fields not defined. Cannot treat the URL.
             return false;
         }
diff --git a/src/addons/mod/data/services/handlers/delete-link.ts b/src/addons/mod/data/services/handlers/delete-link.ts
index e17e662b6..71b0d8125 100644
--- a/src/addons/mod/data/services/handlers/delete-link.ts
+++ b/src/addons/mod/data/services/handlers/delete-link.ts
@@ -48,7 +48,7 @@ export class AddonModDataDeleteLinkHandlerService extends CoreContentLinksHandle
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Params): Promise<boolean> {
-        if (typeof params.d == 'undefined' || typeof params.delete == 'undefined') {
+        if (params.d === undefined || params.delete === undefined) {
             // Required fields not defined. Cannot treat the URL.
             return false;
         }
diff --git a/src/addons/mod/data/services/handlers/edit-link.ts b/src/addons/mod/data/services/handlers/edit-link.ts
index e759b20e2..de515049c 100644
--- a/src/addons/mod/data/services/handlers/edit-link.ts
+++ b/src/addons/mod/data/services/handlers/edit-link.ts
@@ -66,7 +66,7 @@ export class AddonModDataEditLinkHandlerService extends CoreContentLinksHandlerB
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Params): Promise<boolean> {
-        if (typeof params.d == 'undefined') {
+        if (params.d === undefined) {
             // Id not defined. Cannot treat the URL.
             return false;
         }
diff --git a/src/addons/mod/data/services/handlers/show-link.ts b/src/addons/mod/data/services/handlers/show-link.ts
index f1279506a..1804755af 100644
--- a/src/addons/mod/data/services/handlers/show-link.ts
+++ b/src/addons/mod/data/services/handlers/show-link.ts
@@ -77,12 +77,12 @@ export class AddonModDataShowLinkHandlerService extends CoreContentLinksHandlerB
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Params): Promise<boolean> {
-        if (typeof params.d == 'undefined') {
+        if (params.d === undefined) {
             // Id not defined. Cannot treat the URL.
             return false;
         }
 
-        if ((!params.mode || params.mode != 'single') && typeof params.rid == 'undefined') {
+        if ((!params.mode || params.mode != 'single') && params.rid === undefined) {
             return false;
         }
 
diff --git a/src/addons/mod/feedback/components/index/index.ts b/src/addons/mod/feedback/components/index/index.ts
index 3e77a7941..bfa04b763 100644
--- a/src/addons/mod/feedback/components/index/index.ts
+++ b/src/addons/mod/feedback/components/index/index.ts
@@ -299,7 +299,7 @@ export class AddonModFeedbackIndexComponent extends CoreCourseModuleMainActivity
                 item.data = <string[]> item.data.map((dataItem) => {
                     const parsed = <Record<string, string>> CoreTextUtils.parseJSON(dataItem);
 
-                    return typeof parsed.show != 'undefined' ? parsed.show : false;
+                    return parsed.show !== undefined ? parsed.show : false;
                 }).filter((dataItem) => dataItem); // Filter false entries.
 
             case 'textfield':
@@ -312,7 +312,7 @@ export class AddonModFeedbackIndexComponent extends CoreCourseModuleMainActivity
                 const parsedData = <Record<string, string | number>[]> item.data.map((dataItem) => {
                     const parsed = <Record<string, string | number>> CoreTextUtils.parseJSON(dataItem);
 
-                    return typeof parsed.answertext != 'undefined' ? parsed : false;
+                    return parsed.answertext !== undefined ? parsed : false;
                 }).filter((dataItem) => dataItem); // Filter false entries.
 
                 // Format labels.
@@ -320,7 +320,7 @@ export class AddonModFeedbackIndexComponent extends CoreCourseModuleMainActivity
                     dataItem.quotient = (<number> dataItem.quotient * 100).toFixed(2);
                     let label = '';
 
-                    if (typeof dataItem.value != 'undefined') {
+                    if (dataItem.value !== undefined) {
                         label = '(' + dataItem.value + ') ';
                     }
                     label += dataItem.answertext;
diff --git a/src/addons/mod/feedback/pages/nonrespondents/nonrespondents.ts b/src/addons/mod/feedback/pages/nonrespondents/nonrespondents.ts
index 12d312bc0..db568a32a 100644
--- a/src/addons/mod/feedback/pages/nonrespondents/nonrespondents.ts
+++ b/src/addons/mod/feedback/pages/nonrespondents/nonrespondents.ts
@@ -100,7 +100,7 @@ export class AddonModFeedbackNonRespondentsPage implements OnInit {
     protected async loadGroupUsers(groupId?: number): Promise<void> {
         this.loadMoreError = false;
 
-        if (typeof groupId == 'undefined') {
+        if (groupId === undefined) {
             this.page++;
         } else {
             this.selectedGroup = groupId;
diff --git a/src/addons/mod/feedback/pages/respondents/respondents.ts b/src/addons/mod/feedback/pages/respondents/respondents.ts
index 3ef2266a7..73a95a75f 100644
--- a/src/addons/mod/feedback/pages/respondents/respondents.ts
+++ b/src/addons/mod/feedback/pages/respondents/respondents.ts
@@ -115,7 +115,7 @@ export class AddonModFeedbackRespondentsPage implements AfterViewInit {
      * @return Resolved with the attempts loaded.
      */
     protected async loadGroupAttempts(groupId?: number): Promise<void> {
-        if (typeof groupId == 'undefined') {
+        if (groupId === undefined) {
             this.page++;
             this.loadingMore = true;
         } else {
diff --git a/src/addons/mod/feedback/services/feedback-helper.ts b/src/addons/mod/feedback/services/feedback-helper.ts
index 05751c7f5..bb0e6d6af 100644
--- a/src/addons/mod/feedback/services/feedback-helper.ts
+++ b/src/addons/mod/feedback/services/feedback-helper.ts
@@ -178,7 +178,7 @@ export class AddonModFeedbackHelperProvider {
         try {
             const module = await CoreCourse.getModuleBasicInfo(Number(params.id), siteId);
 
-            if (typeof params.showcompleted == 'undefined') {
+            if (params.showcompleted === undefined) {
                 // Param showcompleted not defined. Show entry list.
                 await CoreNavigator.navigateToSitePath(
                     AddonModFeedbackModuleHandlerService.PAGE_NAME + `/${module.course}/${module.id}/respondents`,
@@ -269,7 +269,7 @@ export class AddonModFeedbackHelperProvider {
 
         if (type == MODE_COURSE || type == MODE_CATEGORY) {
             formItem.presentation = formItem.otherdata;
-            formItem.value = typeof formItem.rawValue != 'undefined' ? formItem.rawValue : formItem.otherdata;
+            formItem.value = formItem.rawValue !== undefined ? formItem.rawValue : formItem.otherdata;
         } else if (type == MODE_RESPONSETIME) {
             formItem.value = '__CURRENT__TIMESTAMP__';
 
@@ -298,7 +298,7 @@ export class AddonModFeedbackHelperProvider {
 
         const formItem: AddonModFeedbackNumericItem = Object.assign(item, {
             templateName: 'numeric',
-            value: typeof item.rawValue != 'undefined' ? Number(item.rawValue) : '',
+            value: item.rawValue !== undefined ? Number(item.rawValue) : '',
             rangefrom: typeof rangeFrom == 'number' && !isNaN(rangeFrom) ? range[0] : '',
             rangeto: typeof rangeTo == 'number' && !isNaN(rangeTo) ? rangeTo : '',
             hasTextInput: true,
@@ -318,7 +318,7 @@ export class AddonModFeedbackHelperProvider {
         return Object.assign(item, {
             templateName: 'textfield',
             length: Number(item.presentation.split(AddonModFeedbackProvider.LINE_SEP)[1]) || 255,
-            value: typeof item.rawValue != 'undefined' ? item.rawValue : '',
+            value: item.rawValue !== undefined ? item.rawValue : '',
             hasTextInput: true,
         });
     }
@@ -332,7 +332,7 @@ export class AddonModFeedbackHelperProvider {
     protected getItemFormTextarea(item: AddonModFeedbackItem): AddonModFeedbackFormBasicItem {
         return Object.assign(item, {
             templateName: 'textarea',
-            value: typeof item.rawValue != 'undefined' ? item.rawValue : '',
+            value: item.rawValue !== undefined ? item.rawValue : '',
             hasTextInput: true,
         });
     }
@@ -373,12 +373,12 @@ export class AddonModFeedbackHelperProvider {
 
         if (formItem.subtype === 'r' && formItem.options.search(AddonModFeedbackProvider.MULTICHOICE_HIDENOSELECT) == -1) {
             formItem.choices.unshift({ value: 0, label: Translate.instant('addon.mod_feedback.not_selected') });
-            formItem.value = typeof formItem.rawValue != 'undefined' ? Number(formItem.rawValue) : 0;
+            formItem.value = formItem.rawValue !== undefined ? Number(formItem.rawValue) : 0;
         } else if (formItem.subtype === 'd') {
             formItem.choices.unshift({ value: 0, label: '' });
-            formItem.value = typeof formItem.rawValue != 'undefined' ? Number(formItem.rawValue) : 0;
+            formItem.value = formItem.rawValue !== undefined ? Number(formItem.rawValue) : 0;
         } else if (formItem.subtype === 'c') {
-            if (typeof formItem.rawValue != 'undefined') {
+            if (formItem.rawValue !== undefined) {
                 formItem.rawValue = String(formItem.rawValue);
                 const values = formItem.rawValue.split(AddonModFeedbackProvider.LINE_SEP);
                 formItem.choices.forEach((choice) => {
@@ -392,7 +392,7 @@ export class AddonModFeedbackHelperProvider {
                 });
             }
         } else {
-            formItem.value = typeof formItem.rawValue != 'undefined' ? Number(formItem.rawValue) : '';
+            formItem.value = formItem.rawValue !== undefined ? Number(formItem.rawValue) : '';
         }
 
         return formItem;
diff --git a/src/addons/mod/feedback/services/feedback.ts b/src/addons/mod/feedback/services/feedback.ts
index c1a254df3..814640e9f 100644
--- a/src/addons/mod/feedback/services/feedback.ts
+++ b/src/addons/mod/feedback/services/feedback.ts
@@ -87,7 +87,7 @@ export class AddonModFeedbackProvider {
         let values: AddonModFeedbackResponseValue[];
 
         if (subtype === 'c') {
-            if (typeof item.rawValue == 'undefined') {
+            if (item.rawValue === undefined) {
                 values = [''];
             } else {
                 item.rawValue = '' + item.rawValue;
@@ -146,7 +146,7 @@ export class AddonModFeedbackProvider {
             });
 
             filledItems.forEach((itemData) => {
-                if (itemData.hasvalue && typeof values[itemData.id] != 'undefined') {
+                if (itemData.hasvalue && values[itemData.id] !== undefined) {
                     itemData.rawValue = values[itemData.id];
                 }
             });
@@ -182,7 +182,7 @@ export class AddonModFeedbackProvider {
         });
 
         offlineValuesArray.forEach((value) => {
-            if (typeof offlineValues[value.item] == 'undefined') {
+            if (offlineValues[value.item] === undefined) {
                 offlineValues[value.item] = [];
             }
             offlineValues[value.item].push(value.value);
diff --git a/src/addons/mod/feedback/services/handlers/analysis-link.ts b/src/addons/mod/feedback/services/handlers/analysis-link.ts
index 8081f4bee..58a015234 100644
--- a/src/addons/mod/feedback/services/handlers/analysis-link.ts
+++ b/src/addons/mod/feedback/services/handlers/analysis-link.ts
@@ -78,7 +78,7 @@ export class AddonModFeedbackAnalysisLinkHandlerService extends CoreContentLinks
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Record<string, string>): Promise<boolean> {
-        if (typeof params.id == 'undefined') {
+        if (params.id === undefined) {
             // Cannot treat the URL.
             return false;
         }
diff --git a/src/addons/mod/feedback/services/handlers/complete-link.ts b/src/addons/mod/feedback/services/handlers/complete-link.ts
index f0bc0ac94..1415653fd 100644
--- a/src/addons/mod/feedback/services/handlers/complete-link.ts
+++ b/src/addons/mod/feedback/services/handlers/complete-link.ts
@@ -49,7 +49,7 @@ export class AddonModFeedbackCompleteLinkHandlerService extends CoreContentLinks
                         AddonModFeedbackModuleHandlerService.PAGE_NAME + `/${module.course}/${module.id}/form`,
                         {
                             params: {
-                                page: typeof params.gopage != 'undefined' ? Number(params.gopage) : undefined,
+                                page: params.gopage !== undefined ? Number(params.gopage) : undefined,
                             },
                             siteId,
                         },
@@ -67,7 +67,7 @@ export class AddonModFeedbackCompleteLinkHandlerService extends CoreContentLinks
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Record<string, string>): Promise<boolean> {
-        if (typeof params.id == 'undefined') {
+        if (params.id === undefined) {
             return false;
         }
 
diff --git a/src/addons/mod/feedback/services/handlers/print-link.ts b/src/addons/mod/feedback/services/handlers/print-link.ts
index 1a287d5ad..20205347c 100644
--- a/src/addons/mod/feedback/services/handlers/print-link.ts
+++ b/src/addons/mod/feedback/services/handlers/print-link.ts
@@ -67,7 +67,7 @@ export class AddonModFeedbackPrintLinkHandlerService extends CoreContentLinksHan
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Record<string, string>): Promise<boolean> {
-        if (typeof params.id == 'undefined') {
+        if (params.id === undefined) {
             return false;
         }
 
diff --git a/src/addons/mod/feedback/services/handlers/show-entries-link.ts b/src/addons/mod/feedback/services/handlers/show-entries-link.ts
index 1d1f857d4..30f3b7c15 100644
--- a/src/addons/mod/feedback/services/handlers/show-entries-link.ts
+++ b/src/addons/mod/feedback/services/handlers/show-entries-link.ts
@@ -44,7 +44,7 @@ export class AddonModFeedbackShowEntriesLinkHandlerService extends CoreContentLi
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Record<string, string>): Promise<boolean> {
-        if (typeof params.id == 'undefined') {
+        if (params.id === undefined) {
             // Cannot treat the URL.
             return false;
         }
diff --git a/src/addons/mod/feedback/services/handlers/show-non-respondents-link.ts b/src/addons/mod/feedback/services/handlers/show-non-respondents-link.ts
index cccaadcad..992b9be0d 100644
--- a/src/addons/mod/feedback/services/handlers/show-non-respondents-link.ts
+++ b/src/addons/mod/feedback/services/handlers/show-non-respondents-link.ts
@@ -61,7 +61,7 @@ export class AddonModFeedbackShowNonRespondentsLinkHandlerService extends CoreCo
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Record<string, string>): Promise<boolean> {
-        if (typeof params.id == 'undefined') {
+        if (params.id === undefined) {
             // Cannot treat the URL.
             return false;
         }
diff --git a/src/addons/mod/forum/classes/forum-discussions-source.ts b/src/addons/mod/forum/classes/forum-discussions-source.ts
index 26bd22967..7ef18281f 100644
--- a/src/addons/mod/forum/classes/forum-discussions-source.ts
+++ b/src/addons/mod/forum/classes/forum-discussions-source.ts
@@ -128,7 +128,7 @@ export class AddonModForumDiscussionsSource extends CoreRoutedItemsManagerSource
     async loadForum(): Promise<void> {
         this.forum = await AddonModForum.getForum(this.COURSE_ID, this.CM_ID);
 
-        if (typeof this.forum.istracked != 'undefined') {
+        if (this.forum.istracked !== undefined) {
             this.trackPosts = this.forum.istracked;
         }
     }
@@ -192,7 +192,7 @@ export class AddonModForumDiscussionsSource extends CoreRoutedItemsManagerSource
         }
 
         // If any discussion has unread posts, the whole forum is being tracked.
-        if (typeof this.forum.istracked === 'undefined' && !this.trackPosts) {
+        if (this.forum.istracked === undefined && !this.trackPosts) {
             for (const discussion of discussions) {
                 if (discussion.numunread > 0) {
                     this.trackPosts = true;
diff --git a/src/addons/mod/forum/components/index/index.ts b/src/addons/mod/forum/components/index/index.ts
index 696f762da..9afeb028e 100644
--- a/src/addons/mod/forum/components/index/index.ts
+++ b/src/addons/mod/forum/components/index/index.ts
@@ -218,13 +218,13 @@ export class AddonModForumIndexComponent extends CoreCourseModuleMainActivityCom
                         ) as AddonModForumDiscussion;
 
                         if (discussion) {
-                            if (typeof data.locked != 'undefined') {
+                            if (data.locked !== undefined) {
                                 discussion.locked = data.locked;
                             }
-                            if (typeof data.pinned != 'undefined') {
+                            if (data.pinned !== undefined) {
                                 discussion.pinned = data.pinned;
                             }
-                            if (typeof data.starred != 'undefined') {
+                            if (data.starred !== undefined) {
                                 discussion.starred = data.starred;
                             }
 
@@ -232,7 +232,7 @@ export class AddonModForumIndexComponent extends CoreCourseModuleMainActivityCom
                         }
                     }
 
-                    if (typeof data.deleted != 'undefined' && data.deleted) {
+                    if (data.deleted !== undefined && data.deleted) {
                         if (data.post?.parentid == 0 && CoreScreen.isTablet && !this.discussions.empty) {
                             // Discussion deleted, clear details page.
                             this.discussions.select(this.discussions[0]);
diff --git a/src/addons/mod/forum/components/post-options-menu/post-options-menu.ts b/src/addons/mod/forum/components/post-options-menu/post-options-menu.ts
index fd1662e5a..ad13a1e84 100644
--- a/src/addons/mod/forum/components/post-options-menu/post-options-menu.ts
+++ b/src/addons/mod/forum/components/post-options-menu/post-options-menu.ts
@@ -69,7 +69,7 @@ export class AddonModForumPostOptionsMenuComponent implements OnInit, OnDestroy
             return;
         }
 
-        if (typeof this.post.capabilities.delete == 'undefined') {
+        if (this.post.capabilities.delete === undefined) {
             if (this.forumId) {
                 try {
                     this.post =
diff --git a/src/addons/mod/forum/pages/discussion/discussion.page.ts b/src/addons/mod/forum/pages/discussion/discussion.page.ts
index 0b6428ae0..12bf5c553 100644
--- a/src/addons/mod/forum/pages/discussion/discussion.page.ts
+++ b/src/addons/mod/forum/pages/discussion/discussion.page.ts
@@ -254,17 +254,17 @@ export class AddonModForumDiscussionPage implements OnInit, AfterViewInit, OnDes
         this.changeDiscObserver = CoreEvents.on(AddonModForumProvider.CHANGE_DISCUSSION_EVENT, data => {
             if (discussion && this.forumId && (this.forumId === data.forumId || data.cmId === this.cmId)) {
                 AddonModForum.invalidateDiscussionsList(this.forumId).finally(() => {
-                    if (typeof data.locked != 'undefined') {
+                    if (data.locked !== undefined) {
                         discussion.locked = data.locked;
                     }
-                    if (typeof data.pinned != 'undefined') {
+                    if (data.pinned !== undefined) {
                         discussion.pinned = data.pinned;
                     }
-                    if (typeof data.starred != 'undefined') {
+                    if (data.starred !== undefined) {
                         discussion.starred = data.starred;
                     }
 
-                    if (typeof data.deleted != 'undefined' && data.deleted) {
+                    if (data.deleted !== undefined && data.deleted) {
                         if (!data.post?.parentid) {
                             this.goBack();
                         } else {
@@ -469,7 +469,7 @@ export class AddonModForumDiscussionPage implements OnInit, AfterViewInit, OnDes
                 // Now try to get the forum.
                 const forum = await this.fetchForum();
                 // "forum.istracked" is more reliable than "trackPosts".
-                if (typeof forum.istracked != 'undefined') {
+                if (forum.istracked !== undefined) {
                     this.trackPosts = forum.istracked;
                 }
 
diff --git a/src/addons/mod/forum/services/forum-sync.ts b/src/addons/mod/forum/services/forum-sync.ts
index 65925b3d7..f033e9d22 100644
--- a/src/addons/mod/forum/services/forum-sync.ts
+++ b/src/addons/mod/forum/services/forum-sync.ts
@@ -379,7 +379,7 @@ export class AddonModForumSyncProvider extends CoreCourseActivitySyncBaseProvide
 
         // Do not sync same discussion twice.
         replies.forEach((reply) => {
-            if (typeof promises[reply.discussionid] != 'undefined') {
+            if (promises[reply.discussionid] !== undefined) {
                 return;
             }
             promises[reply.discussionid] = this.syncDiscussionReplies(reply.discussionid, userId, siteId);
diff --git a/src/addons/mod/forum/services/forum.ts b/src/addons/mod/forum/services/forum.ts
index 131706f96..fb1b53bbd 100644
--- a/src/addons/mod/forum/services/forum.ts
+++ b/src/addons/mod/forum/services/forum.ts
@@ -253,11 +253,11 @@ export class AddonModForumProvider {
             throw new Error('Invalid response calling mod_forum_can_add_discussion');
         }
 
-        if (typeof result.canpindiscussions == 'undefined') {
+        if (result.canpindiscussions === undefined) {
             // WS doesn't support it yet, default it to false to prevent students from seeing the option.
             result.canpindiscussions = false;
         }
-        if (typeof result.cancreateattachment == 'undefined') {
+        if (result.cancreateattachment === undefined) {
             // WS doesn't support it yet, default it to true since usually the users will be able to create them.
             result.cancreateattachment = true;
         }
@@ -816,7 +816,7 @@ export class AddonModForumProvider {
             discussions: [] as AddonModForumDiscussion[],
             error: false,
         };
-        let numPages = typeof options.numPages == 'undefined' ? -1 : options.numPages;
+        let numPages = options.numPages === undefined ? -1 : options.numPages;
 
         if (!numPages) {
             return result;
diff --git a/src/addons/mod/forum/services/handlers/post-link.ts b/src/addons/mod/forum/services/handlers/post-link.ts
index 7aa3042f3..79002b558 100644
--- a/src/addons/mod/forum/services/handlers/post-link.ts
+++ b/src/addons/mod/forum/services/handlers/post-link.ts
@@ -78,7 +78,7 @@ export class AddonModForumPostLinkHandlerService extends CoreContentLinksHandler
      * @return Whether the handler is enabled for the URL and site.
      */
     async isEnabled(siteId: string, url: string, params: Params): Promise<boolean> {
-        return typeof params.forum != 'undefined';
+        return params.forum !== undefined;
     }
 
 }
diff --git a/src/addons/mod/glossary/services/glossary-helper.ts b/src/addons/mod/glossary/services/glossary-helper.ts
index 1e25ddffd..ce1dcc587 100644
--- a/src/addons/mod/glossary/services/glossary-helper.ts
+++ b/src/addons/mod/glossary/services/glossary-helper.ts
@@ -71,7 +71,7 @@ export class AddonModGlossaryHelperProvider {
         files: CoreFileEntry[],
         original?: AddonModGlossaryNewEntryWithFiles,
     ): boolean {
-        if (!original || typeof original.concept == 'undefined') {
+        if (!original || original.concept === undefined) {
             // There is no original data.
             return !!(entry.definition || entry.concept || files.length > 0);
         }
diff --git a/src/addons/mod/glossary/services/glossary.ts b/src/addons/mod/glossary/services/glossary.ts
index 033adbe77..eeb8ec937 100644
--- a/src/addons/mod/glossary/services/glossary.ts
+++ b/src/addons/mod/glossary/services/glossary.ts
@@ -583,7 +583,7 @@ export class AddonModGlossaryProvider {
             try {
                 const data = await this.getStoredDataForEntry(entryId, site.getId());
 
-                if (typeof data.from != 'undefined') {
+                if (data.from !== undefined) {
                     const response = await CoreUtils.ignoreErrors(
                         this.getEntryFromList(data.glossaryId, entryId, data.from, false, options),
                     );
diff --git a/src/addons/mod/glossary/services/handlers/edit-link.ts b/src/addons/mod/glossary/services/handlers/edit-link.ts
index f72ea2667..ffc4b3203 100644
--- a/src/addons/mod/glossary/services/handlers/edit-link.ts
+++ b/src/addons/mod/glossary/services/handlers/edit-link.ts
@@ -70,7 +70,7 @@ export class AddonModGlossaryEditLinkHandlerService extends CoreContentLinksHand
      * @inheritdoc
      */
     async isEnabled(siteId: string, url: string, params: Record<string, string>): Promise<boolean> {
-        return typeof params.cmid != 'undefined';
+        return params.cmid !== undefined;
     }
 
 }
diff --git a/src/addons/mod/h5pactivity/services/handlers/report-link.ts b/src/addons/mod/h5pactivity/services/handlers/report-link.ts
index ee6b8c9ab..760d0b72e 100644
--- a/src/addons/mod/h5pactivity/services/handlers/report-link.ts
+++ b/src/addons/mod/h5pactivity/services/handlers/report-link.ts
@@ -56,7 +56,7 @@ export class AddonModH5PActivityReportLinkHandlerService extends CoreContentLink
 
                     const module = await CoreCourse.getModuleBasicInfoByInstance(instanceId, 'h5pactivity', siteId);
 
-                    if (typeof params.attemptid != 'undefined') {
+                    if (params.attemptid !== undefined) {
                         this.openAttemptResults(module.id, Number(params.attemptid), courseId, siteId);
                     } else {
                         const userId = params.userid ? Number(params.userid) : undefined;
diff --git a/src/addons/mod/lesson/services/lesson-helper.ts b/src/addons/mod/lesson/services/lesson-helper.ts
index cebbb9f88..669a9bd5b 100644
--- a/src/addons/mod/lesson/services/lesson-helper.ts
+++ b/src/addons/mod/lesson/services/lesson-helper.ts
@@ -416,7 +416,7 @@ export class AddonModLessonHelperProvider {
             // Treat each option.
             let controlAdded = false;
             options.forEach((option) => {
-                if (typeof option.value == 'undefined') {
+                if (option.value === undefined) {
                     // Option not valid, ignore it.
                     return;
                 }
diff --git a/src/addons/mod/lesson/services/lesson.ts b/src/addons/mod/lesson/services/lesson.ts
index a89470d6d..5f78849ec 100644
--- a/src/addons/mod/lesson/services/lesson.ts
+++ b/src/addons/mod/lesson/services/lesson.ts
@@ -418,11 +418,11 @@ export class AddonModLessonProvider {
         }
 
         // The name was changed to "answer_editor" in 3.7. Before it was just "answer". Support both cases.
-        if (typeof data['answer_editor[text]'] != 'undefined') {
+        if (data['answer_editor[text]'] !== undefined) {
             studentAnswer = data['answer_editor[text]'];
         } else if (typeof data.answer_editor == 'object') {
             studentAnswer = (<{text: string}> data.answer_editor).text;
-        } else if (typeof data['answer[text]'] != 'undefined') {
+        } else if (data['answer[text]'] !== undefined) {
             studentAnswer = data['answer[text]'];
         } else if (typeof data.answer == 'object') {
             studentAnswer = (<{text: string}> data.answer).text;
@@ -505,7 +505,7 @@ export class AddonModLessonProvider {
             value = CoreTextUtils.decodeHTML(value);
             userResponse.push(value);
 
-            if (typeof answers[id] != 'undefined') {
+            if (answers[id] !== undefined) {
                 const answer = answers[id];
 
                 result.studentanswer += '<br />' + answer.answer + ' = ' + value;
@@ -606,7 +606,7 @@ export class AddonModLessonProvider {
                             nHits++;
                         } else {
                             // Always use the first student wrong answer.
-                            if (typeof wrongPageId == 'undefined') {
+                            if (wrongPageId === undefined) {
                                 wrongPageId = answer.jumpto;
                             }
                             // Save the answer id for scoring.
@@ -621,7 +621,7 @@ export class AddonModLessonProvider {
                     nCorrect++;
 
                     // Save the first jumpto.
-                    if (typeof correctPageId == 'undefined') {
+                    if (correctPageId === undefined) {
                         correctPageId = answer.jumpto;
                     }
                     // Save the answer id for scoring.
@@ -644,7 +644,7 @@ export class AddonModLessonProvider {
             }
         } else {
             // Only one answer allowed.
-            if (typeof data.answerid == 'undefined' || (!data.answerid && Number(data.answerid) !== 0)) {
+            if (data.answerid === undefined || (!data.answerid && Number(data.answerid) !== 0)) {
                 result.noanswer = true;
 
                 return;
@@ -1501,7 +1501,7 @@ export class AddonModLessonProvider {
 
         const response = await site.read<AddonModLessonGetLessonWSResponse>('mod_lesson_get_lesson', params, preSets);
 
-        if (typeof response.lesson.ongoing == 'undefined') {
+        if (response.lesson.ongoing === undefined) {
             // Basic data not received, password is wrong. Remove stored password.
             this.removeStoredPassword(lessonId, site.id);
 
@@ -1788,7 +1788,7 @@ export class AddonModLessonProvider {
         const jumps: AddonModLessonPossibleJumps = {};
 
         response.jumps.forEach((jump) => {
-            if (typeof jumps[jump.pageid] == 'undefined') {
+            if (jumps[jump.pageid] === undefined) {
                 jumps[jump.pageid] = {};
             }
             jumps[jump.pageid][jump.jumpto] = jump;
@@ -2886,7 +2886,7 @@ export class AddonModLessonProvider {
                 if (options.pageIndex[lastAttempt.pageid].qtype == AddonModLessonProvider.LESSON_PAGE_ESSAY) {
                     // eslint-disable-next-line @typescript-eslint/no-explicit-any
                     const score: number | undefined = (<any> lastAttempt.useranswer)?.score;
-                    if (typeof score != 'undefined') {
+                    if (score !== undefined) {
                         result.earned += score;
                     }
                     result.nmanual++;
@@ -2917,7 +2917,7 @@ export class AddonModLessonProvider {
             for (const answerId in answers) {
                 const answer = answers[answerId];
 
-                if (typeof bestScores[answer.pageid] == 'undefined') {
+                if (bestScores[answer.pageid] === undefined) {
                     bestScores[answer.pageid] = answer.score || 0;
                 } else if (bestScores[answer.pageid] < (answer.score || 0)) {
                     bestScores[answer.pageid] = answer.score || 0;
@@ -3271,7 +3271,7 @@ export class AddonModLessonProvider {
 
         if (lesson.review && !result.correctanswer && !result.isessayquestion) {
             // Calculate the number of question attempt in the page if it isn't calculated already.
-            if (typeof nAttempts == 'undefined') {
+            if (nAttempts === undefined) {
                 const result = await this.getQuestionsAttempts(lesson.id, retake, {
                     cmId: lesson.coursemodule,
                     pageId: pageData.page.id,
diff --git a/src/addons/mod/page/components/index/index.ts b/src/addons/mod/page/components/index/index.ts
index 3017d9bf1..a58d49a3a 100644
--- a/src/addons/mod/page/components/index/index.ts
+++ b/src/addons/mod/page/components/index/index.ts
@@ -113,9 +113,9 @@ export class AddonModPageIndexComponent extends CoreCourseModuleMainResourceComp
             const options: Record<string, string | boolean> =
                 CoreTextUtils.unserialize(this.page.displayoptions) || {};
 
-            this.displayDescription = typeof options.printintro == 'undefined' ||
+            this.displayDescription = options.printintro === undefined ||
                     CoreUtils.isTrueOrOne(options.printintro);
-            this.displayTimemodified = typeof options.printlastmodified == 'undefined' ||
+            this.displayTimemodified = options.printlastmodified === undefined ||
                     CoreUtils.isTrueOrOne(options.printlastmodified);
         } else {
             this.displayDescription = true;
diff --git a/src/addons/mod/quiz/accessrules/password/services/handlers/password.ts b/src/addons/mod/quiz/accessrules/password/services/handlers/password.ts
index 447b336b6..b61c24d84 100644
--- a/src/addons/mod/quiz/accessrules/password/services/handlers/password.ts
+++ b/src/addons/mod/quiz/accessrules/password/services/handlers/password.ts
@@ -48,7 +48,7 @@ export class AddonModQuizAccessPasswordHandlerService implements AddonModQuizAcc
         prefetch?: boolean,
         siteId?: string,
     ): Promise<void> {
-        if (typeof preflightData.quizpassword != 'undefined') {
+        if (preflightData.quizpassword !== undefined) {
             return;
         }
 
@@ -134,7 +134,7 @@ export class AddonModQuizAccessPasswordHandlerService implements AddonModQuizAcc
         siteId?: string,
     ): Promise<void> {
         // The password is right, store it to use it automatically in following executions.
-        if (typeof preflightData.quizpassword != 'undefined') {
+        if (preflightData.quizpassword !== undefined) {
             return this.storePassword(quiz.id, preflightData.quizpassword, siteId);
         }
     }
diff --git a/src/addons/mod/quiz/components/index/index.ts b/src/addons/mod/quiz/components/index/index.ts
index 078c97054..92bdfd881 100644
--- a/src/addons/mod/quiz/components/index/index.ts
+++ b/src/addons/mod/quiz/components/index/index.ts
@@ -615,7 +615,7 @@ export class AddonModQuizIndexComponent extends CoreCourseModuleMainActivityComp
 
         await Promise.all(promises);
 
-        const grade = typeof this.gradebookData?.grade != 'undefined' ? this.gradebookData.grade : this.bestGrade?.grade;
+        const grade = this.gradebookData?.grade !== undefined ? this.gradebookData.grade : this.bestGrade?.grade;
         const quizGrade = AddonModQuiz.formatGrade(grade, quiz.decimalpoints);
 
         // Calculate data to construct the header of the attempts table.
diff --git a/src/addons/mod/quiz/pages/attempt/attempt.page.ts b/src/addons/mod/quiz/pages/attempt/attempt.page.ts
index 85481178d..8906d97f2 100644
--- a/src/addons/mod/quiz/pages/attempt/attempt.page.ts
+++ b/src/addons/mod/quiz/pages/attempt/attempt.page.ts
@@ -186,7 +186,7 @@ export class AddonModQuizAttemptPage implements OnInit {
             promises.push(AddonModQuiz.invalidateQuizAccessInformation(this.quiz.id));
             promises.push(AddonModQuiz.invalidateCombinedReviewOptionsForUser(this.quiz.id));
 
-            if (this.attempt && typeof this.feedback != 'undefined') {
+            if (this.attempt && this.feedback !== undefined) {
                 promises.push(AddonModQuiz.invalidateFeedback(this.quiz.id));
             }
         }
diff --git a/src/addons/mod/quiz/pages/player/player.page.ts b/src/addons/mod/quiz/pages/player/player.page.ts
index c2da33f1b..16e1a22de 100644
--- a/src/addons/mod/quiz/pages/player/player.page.ts
+++ b/src/addons/mod/quiz/pages/player/player.page.ts
@@ -261,7 +261,7 @@ export class AddonModQuizPlayerPage implements OnInit, OnDestroy, CanLeave {
         if (page != -1 && (this.attempt.state == AddonModQuizProvider.ATTEMPT_OVERDUE || this.attempt.finishedOffline)) {
             // We can't load a page if overdue or the local attempt is finished.
             return;
-        } else if (page == this.attempt.currentpage && !this.showSummary && typeof slot != 'undefined') {
+        } else if (page == this.attempt.currentpage && !this.showSummary && slot !== undefined) {
             // Navigating to a question in the current page.
             this.scrollToQuestion(slot);
 
@@ -317,7 +317,7 @@ export class AddonModQuizPlayerPage implements OnInit, OnDestroy, CanLeave {
         } finally {
             this.loaded = true;
 
-            if (typeof slot != 'undefined') {
+            if (slot !== undefined) {
                 // Scroll to the question. Give some time to the questions to render.
                 setTimeout(() => {
                     this.scrollToQuestion(slot);
diff --git a/src/addons/mod/quiz/pages/review/review.page.ts b/src/addons/mod/quiz/pages/review/review.page.ts
index 98d01d3da..07fb1c5cd 100644
--- a/src/addons/mod/quiz/pages/review/review.page.ts
+++ b/src/addons/mod/quiz/pages/review/review.page.ts
@@ -116,7 +116,7 @@ export class AddonModQuizReviewPage implements OnInit {
      * @param slot Slot of the question to scroll to.
      */
     async changePage(page: number, fromModal?: boolean, slot?: number): Promise<void> {
-        if (typeof slot != 'undefined' && (this.attempt!.currentpage == -1 || page == this.currentPage)) {
+        if (slot !== undefined && (this.attempt!.currentpage == -1 || page == this.currentPage)) {
             // Scrol to a certain question in the current page.
             this.scrollToQuestion(slot);
 
@@ -136,7 +136,7 @@ export class AddonModQuizReviewPage implements OnInit {
         } finally {
             this.loaded = true;
 
-            if (typeof slot != 'undefined') {
+            if (slot !== undefined) {
                 // Scroll to the question. Give some time to the questions to render.
                 setTimeout(() => {
                     this.scrollToQuestion(slot);
@@ -286,7 +286,7 @@ export class AddonModQuizReviewPage implements OnInit {
         if (this.options!.someoptions.marks >= AddonModQuizProvider.QUESTION_OPTIONS_MARK_AND_MAX &&
                 AddonModQuiz.quizHasGrades(this.quiz)) {
 
-            if (data.grade === null || typeof data.grade == 'undefined') {
+            if (data.grade === null || data.grade === undefined) {
                 this.readableGrade = AddonModQuiz.formatGrade(data.grade, this.quiz.decimalpoints);
             } else {
                 // Show raw marks only if they are different from the grade (like on the entry page).
diff --git a/src/addons/mod/quiz/services/handlers/prefetch.ts b/src/addons/mod/quiz/services/handlers/prefetch.ts
index 47b61b959..e1d035e83 100644
--- a/src/addons/mod/quiz/services/handlers/prefetch.ts
+++ b/src/addons/mod/quiz/services/handlers/prefetch.ts
@@ -120,7 +120,7 @@ export class AddonModQuizPrefetchHandlerService extends CoreCourseActivityPrefet
             }
 
             const attemptGrade = AddonModQuiz.rescaleGrade(attempt.sumgrades, quiz, false);
-            if (typeof attemptGrade == 'undefined') {
+            if (attemptGrade === undefined) {
                 return;
             }
 
@@ -421,7 +421,7 @@ export class AddonModQuizPrefetchHandlerService extends CoreCourseActivityPrefet
         if (AddonModQuiz.isAttemptFinished(attempt.state)) {
             // Attempt is finished, get feedback and review data.
             const attemptGrade = AddonModQuiz.rescaleGrade(attempt.sumgrades, quiz, false);
-            if (typeof attemptGrade != 'undefined') {
+            if (attemptGrade !== undefined) {
                 promises.push(AddonModQuiz.getFeedbackForGrade(quiz.id, Number(attemptGrade), modOptions));
             }
 
diff --git a/src/addons/mod/quiz/services/quiz.ts b/src/addons/mod/quiz/services/quiz.ts
index c3cc895df..bc8793596 100644
--- a/src/addons/mod/quiz/services/quiz.ts
+++ b/src/addons/mod/quiz/services/quiz.ts
@@ -425,7 +425,7 @@ export class AddonModQuizProvider {
         attemptId: number,
         options: AddonModQuizGetAttemptReviewOptions = {},
     ): Promise<AddonModQuizGetAttemptReviewResponse> {
-        const page = typeof options.page == 'undefined' ? -1 : options.page;
+        const page = options.page === undefined ? -1 : options.page;
 
         const site = await CoreSites.getSite(options.siteId);
 
@@ -620,7 +620,7 @@ export class AddonModQuizProvider {
      * @return Number of decimals.
      */
     getGradeDecimals(quiz: AddonModQuizQuizWSData): number {
-        if (typeof quiz.questiondecimalpoints == 'undefined') {
+        if (quiz.questiondecimalpoints === undefined) {
             quiz.questiondecimalpoints = -1;
         }
 
@@ -1029,7 +1029,7 @@ export class AddonModQuizProvider {
     ): Promise<AddonModQuizAttemptWSData[]> {
 
         const status = options.status || 'all';
-        const includePreviews = typeof options.includePreviews == 'undefined' ? true : options.includePreviews;
+        const includePreviews = options.includePreviews === undefined ? true : options.includePreviews;
 
         const site = await CoreSites.getSite(options.siteId);
 
diff --git a/src/addons/mod/resource/components/index/index.ts b/src/addons/mod/resource/components/index/index.ts
index a3a29b038..8b95a597a 100644
--- a/src/addons/mod/resource/components/index/index.ts
+++ b/src/addons/mod/resource/components/index/index.ts
@@ -116,7 +116,7 @@ export class AddonModResourceIndexComponent extends CoreCourseModuleMainResource
             resource.displayoptions ? CoreTextUtils.unserialize(resource.displayoptions) : {};
 
         try {
-            this.displayDescription = typeof options.printintro == 'undefined' || !!options.printintro;
+            this.displayDescription = options.printintro === undefined || !!options.printintro;
             this.dataRetrieved.emit(resource);
 
             if (AddonModResourceHelper.isDisplayedInIframe(this.module)) {
diff --git a/src/addons/mod/scorm/components/index/index.ts b/src/addons/mod/scorm/components/index/index.ts
index 945ba9112..44985f6d1 100644
--- a/src/addons/mod/scorm/components/index/index.ts
+++ b/src/addons/mod/scorm/components/index/index.ts
@@ -203,7 +203,7 @@ export class AddonModScormIndexComponent extends CoreCourseModuleMainActivityCom
             this.accessInfo = accessInfo;
 
             // Check whether to launch the SCORM immediately.
-            if (typeof this.skip == 'undefined') {
+            if (this.skip === undefined) {
                 this.skip = !this.hasOffline && !this.errorMessage &&
                     (!this.scorm.lastattemptlock || this.attemptsLeft > 0) &&
                     this.accessInfo.canskipview && !this.accessInfo.canviewreport &&
diff --git a/src/addons/mod/scorm/services/scorm-offline.ts b/src/addons/mod/scorm/services/scorm-offline.ts
index 2971656e9..9f9874486 100644
--- a/src/addons/mod/scorm/services/scorm-offline.ts
+++ b/src/addons/mod/scorm/services/scorm-offline.ts
@@ -682,7 +682,7 @@ export class AddonModScormOfflineProvider {
             scoid: scoId,
             attempt,
             element: element,
-            value: typeof value == 'undefined' ? null : JSON.stringify(value),
+            value: value === undefined ? null : JSON.stringify(value),
             timemodified: CoreTimeUtils.timestamp(),
             synced: 0,
         };
@@ -937,7 +937,7 @@ export class AddonModScormOfflineProvider {
         param: string,
         ifEmpty: AddonModScormDataValue = '',
     ): AddonModScormDataValue {
-        if (typeof userData[param] != 'undefined') {
+        if (userData[param] !== undefined) {
             return userData[param];
         }
 
diff --git a/src/addons/mod/scorm/services/scorm-sync.ts b/src/addons/mod/scorm/services/scorm-sync.ts
index 5c9e1f158..520864d6e 100644
--- a/src/addons/mod/scorm/services/scorm-sync.ts
+++ b/src/addons/mod/scorm/services/scorm-sync.ts
@@ -476,7 +476,7 @@ export class AddonModScormSyncProvider extends CoreCourseActivitySyncBaseProvide
                 await this.syncScorm(scorm, siteId) :
                 await this.syncScormIfNeeded(scorm, siteId);
 
-            if (typeof data != 'undefined') {
+            if (data !== undefined) {
                 // We tried to sync. Send event.
                 CoreEvents.trigger(AddonModScormSyncProvider.AUTO_SYNCED, {
                     scormId: scorm.id,
diff --git a/src/addons/mod/scorm/services/scorm.ts b/src/addons/mod/scorm/services/scorm.ts
index a5cd5ecb9..528e68c6a 100644
--- a/src/addons/mod/scorm/services/scorm.ts
+++ b/src/addons/mod/scorm/services/scorm.ts
@@ -331,7 +331,7 @@ export class AddonModScormProvider {
                     set.forEach((setElement) => {
                         setElement = setElement.trim();
 
-                        if (typeof trackData[setElement] != 'undefined' &&
+                        if (trackData[setElement] !== undefined &&
                                 (trackData[setElement].status == 'completed' || trackData[setElement].status == 'passed')) {
                             count++;
                         }
@@ -350,11 +350,11 @@ export class AddonModScormProvider {
                     matches = element.match(reOther)!;
                     element = matches[1].trim();
 
-                    if (typeof trackData[element] != 'undefined') {
+                    if (trackData[element] !== undefined) {
                         let value = matches[3].trim().replace(/('|")/gi, '');
                         let oper: string;
 
-                        if (typeof STATUSES[value] != 'undefined') {
+                        if (STATUSES[value] !== undefined) {
                             value = STATUSES[value];
                         }
 
@@ -370,7 +370,7 @@ export class AddonModScormProvider {
                     }
                 } else {
                     // Everything else must be an element defined like S45 ...
-                    if (typeof trackData[element] != 'undefined' &&
+                    if (trackData[element] !== undefined &&
                             (trackData[element].status == 'completed' || trackData[element].status == 'passed')) {
                         element = 'true';
                     } else {
@@ -395,7 +395,7 @@ export class AddonModScormProvider {
      * @return Grade to display.
      */
     formatGrade(scorm: AddonModScormScorm, grade: number): string {
-        if (typeof grade == 'undefined' || grade == -1) {
+        if (grade === undefined || grade == -1) {
             return Translate.instant('core.none');
         }
 
@@ -607,8 +607,8 @@ export class AddonModScormProvider {
                 attemptScore.scos++;
             }
 
-            if (userData.score_raw || (typeof scorm.scormtype != 'undefined' &&
-                        scorm.scormtype == 'sco' && typeof userData.score_raw != 'undefined')) {
+            if (userData.score_raw || (scorm.scormtype !== undefined &&
+                        scorm.scormtype == 'sco' && userData.score_raw !== undefined)) {
 
                 const scoreRaw = parseFloat(<string> userData.score_raw);
                 attemptScore.values++;
@@ -912,14 +912,14 @@ export class AddonModScormProvider {
             }
 
             // Check isvisible attribute.
-            sco.isvisible = typeof scoData.isvisible == 'undefined' || (!!scoData.isvisible && scoData.isvisible !== 'false');
+            sco.isvisible = scoData.isvisible === undefined || (!!scoData.isvisible && scoData.isvisible !== 'false');
             // Check pre-requisites status.
-            sco.prereq = typeof scoData.prerequisites == 'undefined' ||
+            sco.prereq = scoData.prerequisites === undefined ||
                 this.evalPrerequisites(<string> scoData.prerequisites, trackDataBySCO);
             // Add status.
-            sco.status = (typeof scoData.status == 'undefined' || scoData.status === '') ? 'notattempted' : <string> scoData.status;
+            sco.status = (scoData.status === undefined || scoData.status === '') ? 'notattempted' : <string> scoData.status;
             // Exit var.
-            sco.exitvar = typeof scoData.exitvar == 'undefined' ? 'cmi.core.exit' : <string> scoData.exitvar;
+            sco.exitvar = scoData.exitvar === undefined ? 'cmi.core.exit' : <string> scoData.exitvar;
             sco.exitvalue = <string> scoData[sco.exitvar];
             // Copy score.
             sco.scoreraw = scoData.score_raw;
@@ -1109,7 +1109,7 @@ export class AddonModScormProvider {
         }
 
         // If the SCORM isn't available the WS returns a warning and it doesn't return timeopen and timeclosed.
-        if (typeof currentScorm.timeopen == 'undefined') {
+        if (currentScorm.timeopen === undefined) {
             const warning = response.warnings?.find(warning => warning.itemid === currentScorm.id);
             currentScorm.warningMessage = warning?.message;
         }
@@ -1339,7 +1339,7 @@ export class AddonModScormProvider {
      * @return Whether the SCORM is downloadable.
      */
     isScormDownloadable(scorm: AddonModScormScorm): boolean {
-        return typeof scorm.protectpackagedownloads != 'undefined' && scorm.protectpackagedownloads === false;
+        return scorm.protectpackagedownloads !== undefined && scorm.protectpackagedownloads === false;
     }
 
     /**
@@ -1635,7 +1635,7 @@ export class AddonModScormProvider {
 
         const component = AddonModScormProvider.COMPONENT;
 
-        if (typeof isOutdated == 'undefined') {
+        if (isOutdated === undefined) {
             // Calculate if it's outdated.
             const data = await CoreUtils.ignoreErrors(CoreFilepool.getPackageData(siteId, component, scorm.coursemodule));
 
diff --git a/src/addons/mod/url/components/index/index.ts b/src/addons/mod/url/components/index/index.ts
index e92c6541e..db01da3b2 100644
--- a/src/addons/mod/url/components/index/index.ts
+++ b/src/addons/mod/url/components/index/index.ts
@@ -92,7 +92,7 @@ export class AddonModUrlIndexComponent extends CoreCourseModuleMainResourceCompo
 
             if (url.displayoptions) {
                 const unserialized = CoreTextUtils.unserialize<AddonModUrlDisplayOptions>(url.displayoptions);
-                this.displayDescription = typeof unserialized.printintro == 'undefined' || !!unserialized.printintro;
+                this.displayDescription = unserialized.printintro === undefined || !!unserialized.printintro;
             }
 
             // Try to get module contents, it's needed to get the URL with parameters.
diff --git a/src/addons/mod/wiki/components/index/index.ts b/src/addons/mod/wiki/components/index/index.ts
index 1ae8303a8..45ea90277 100644
--- a/src/addons/mod/wiki/components/index/index.ts
+++ b/src/addons/mod/wiki/components/index/index.ts
@@ -959,28 +959,28 @@ export class AddonModWikiIndexComponent extends CoreCourseModuleMainActivityComp
                         candidateSubwikiId = subwiki.id;
                     }
 
-                    if (typeof candidateSubwikiId != 'undefined') {
+                    if (candidateSubwikiId !== undefined) {
                         if (candidateSubwikiId > 0) {
                             // Subwiki found and created, no need to keep looking.
                             candidateFirstPage = Number(i);
                             break;
-                        } else if (typeof candidateNoFirstPage == 'undefined') {
+                        } else if (candidateNoFirstPage === undefined) {
                             candidateNoFirstPage = Number(i);
                         }
-                    } else if (typeof firstCanEdit == 'undefined') {
+                    } else if (firstCanEdit === undefined) {
                         firstCanEdit = Number(i);
                     }
                 }
             }
 
             let subWikiToTake: number;
-            if (typeof candidateFirstPage != 'undefined') {
+            if (candidateFirstPage !== undefined) {
                 // Take the candidate that already has the first page created.
                 subWikiToTake = candidateFirstPage;
-            } else if (typeof candidateNoFirstPage != 'undefined') {
+            } else if (candidateNoFirstPage !== undefined) {
                 // No first page created, take the first candidate.
                 subWikiToTake = candidateNoFirstPage;
-            } else if (typeof firstCanEdit != 'undefined') {
+            } else if (firstCanEdit !== undefined) {
                 // None selected, take the first the user can edit.
                 subWikiToTake = firstCanEdit;
             } else {
@@ -989,7 +989,7 @@ export class AddonModWikiIndexComponent extends CoreCourseModuleMainActivityComp
             }
 
             const subwiki = subwikiList[subWikiToTake];
-            if (typeof subwiki != 'undefined') {
+            if (subwiki !== undefined) {
                 this.setSelectedWiki(subwiki.id, subwiki.userid, subwiki.groupid);
             }
         }
@@ -1022,7 +1022,7 @@ export class AddonModWikiIndexComponent extends CoreCourseModuleMainActivityComp
             // As we loop over each subwiki, add it to the current group
             subwikiList.forEach((subwiki) => {
                 // Add the subwiki to the currently active grouping.
-                if (typeof subwiki.canedit == 'undefined') {
+                if (subwiki.canedit === undefined) {
                     noGrouping.subwikis.push(subwiki);
                 } else if (subwiki.canedit) {
                     myGroupsGrouping.subwikis.push(subwiki);
diff --git a/src/addons/mod/wiki/services/handlers/edit-link.ts b/src/addons/mod/wiki/services/handlers/edit-link.ts
index 6a164a954..ea0fd3a82 100644
--- a/src/addons/mod/wiki/services/handlers/edit-link.ts
+++ b/src/addons/mod/wiki/services/handlers/edit-link.ts
@@ -54,7 +54,7 @@ export class AddonModWikiEditLinkHandlerService extends CoreContentLinksHandlerB
                     const module = await CoreCourse.getModuleBasicInfoByInstance(pageContents.wikiid, 'wiki', siteId);
 
                     let section = '';
-                    if (typeof params.section != 'undefined') {
+                    if (params.section !== undefined) {
                         section = params.section.replace(/\+/g, ' ');
                     }
 
diff --git a/src/addons/mod/wiki/services/handlers/page-or-map-link.ts b/src/addons/mod/wiki/services/handlers/page-or-map-link.ts
index 78bf94f5f..cc9043db3 100644
--- a/src/addons/mod/wiki/services/handlers/page-or-map-link.ts
+++ b/src/addons/mod/wiki/services/handlers/page-or-map-link.ts
@@ -97,7 +97,7 @@ export class AddonModWikiPageOrMapLinkHandlerService extends CoreContentLinksHan
         if (params.id && !isMap) {
             // ID param is more prioritary than pageid in index page, it's a index URL.
             return false;
-        } else if (isMap && typeof params.option != 'undefined' && params.option != '5') {
+        } else if (isMap && params.option !== undefined && params.option != '5') {
             // Map link but the option isn't "Page list", not supported.
             return false;
         }
diff --git a/src/addons/mod/wiki/services/wiki.ts b/src/addons/mod/wiki/services/wiki.ts
index 580e9f20d..c237c7856 100644
--- a/src/addons/mod/wiki/services/wiki.ts
+++ b/src/addons/mod/wiki/services/wiki.ts
@@ -58,7 +58,7 @@ export class AddonModWikiProvider {
      * @param wikiId wiki Id, if not provided all will be cleared.
      */
     clearSubwikiList(wikiId?: number): void {
-        if (typeof wikiId == 'undefined') {
+        if (wikiId === undefined) {
             this.subwikiListsCache = {};
         } else {
             delete this.subwikiListsCache[wikiId];
diff --git a/src/addons/mod/workshop/components/index/index.ts b/src/addons/mod/workshop/components/index/index.ts
index 91c8bba44..f3cd51e4d 100644
--- a/src/addons/mod/workshop/components/index/index.ts
+++ b/src/addons/mod/workshop/components/index/index.ts
@@ -322,7 +322,7 @@ export class AddonModWorkshopIndexComponent extends CoreCourseModuleMainActivity
 
             const offlineData = await AddonModWorkshopHelper.applyOfflineData(submission, this.offlineSubmissions);
 
-            if (typeof offlineData != 'undefined') {
+            if (offlineData !== undefined) {
                 this.grades!.push(offlineData);
             }
         }));
diff --git a/src/addons/mod/workshop/services/handlers/prefetch.ts b/src/addons/mod/workshop/services/handlers/prefetch.ts
index ad986d253..7700b19cf 100644
--- a/src/addons/mod/workshop/services/handlers/prefetch.ts
+++ b/src/addons/mod/workshop/services/handlers/prefetch.ts
@@ -160,7 +160,7 @@ export class AddonModWorkshopPrefetchHandlerService extends CoreCourseActivityPr
             return {
                 workshop,
                 groups,
-                files: files.filter((file) => typeof file !== 'undefined'),
+                files: files.filter((file) => file !== undefined),
             };
         } catch (error) {
             if (options.omitFail) {
@@ -168,7 +168,7 @@ export class AddonModWorkshopPrefetchHandlerService extends CoreCourseActivityPr
                 return {
                     workshop,
                     groups,
-                    files: files.filter((file) => typeof file !== 'undefined'),
+                    files: files.filter((file) => file !== undefined),
                 };
             }
 
diff --git a/src/addons/mod/workshop/services/workshop-helper.ts b/src/addons/mod/workshop/services/workshop-helper.ts
index 7f355f5ac..94eb54851 100644
--- a/src/addons/mod/workshop/services/workshop-helper.ts
+++ b/src/addons/mod/workshop/services/workshop-helper.ts
@@ -460,7 +460,7 @@ export class AddonModWorkshopHelperProvider {
             return submission;
         }
 
-        if (typeof submission == 'undefined') {
+        if (submission === undefined) {
             submission = {
                 id: 0,
                 workshopid: 0,
@@ -559,7 +559,7 @@ export class AddonModWorkshopHelperProvider {
             return value;
         }
 
-        if (value == null || typeof value == 'undefined') {
+        if (value == null || value === undefined) {
             return undefined;
         }
 
@@ -602,7 +602,7 @@ export class AddonModWorkshopHelperProvider {
      * @return If grade should be shown or not.
      */
     showGrade(grade?: number|string): boolean {
-        return typeof grade !== 'undefined' && grade !== null;
+        return grade !== undefined && grade !== null;
     }
 
 }
diff --git a/src/addons/mod/workshop/services/workshop.ts b/src/addons/mod/workshop/services/workshop.ts
index 53bc85119..59ab0c196 100644
--- a/src/addons/mod/workshop/services/workshop.ts
+++ b/src/addons/mod/workshop/services/workshop.ts
@@ -263,8 +263,8 @@ export class AddonModWorkshopProvider {
         }
 
         // Set submission types for Moodle 3.5.
-        if (typeof workshop.submissiontypetext == 'undefined') {
-            if (typeof workshop.nattachments != 'undefined' && workshop.nattachments > 0) {
+        if (workshop.submissiontypetext === undefined) {
+            if (workshop.nattachments !== undefined && workshop.nattachments > 0) {
                 workshop.submissiontypetext = AddonModWorkshopSubmissionType.SUBMISSION_TYPE_AVAILABLE;
                 workshop.submissiontypefile = AddonModWorkshopSubmissionType.SUBMISSION_TYPE_AVAILABLE;
             } else {
diff --git a/src/addons/notes/pages/list/list.page.ts b/src/addons/notes/pages/list/list.page.ts
index 4480fc250..be375f2dd 100644
--- a/src/addons/notes/pages/list/list.page.ts
+++ b/src/addons/notes/pages/list/list.page.ts
@@ -195,7 +195,7 @@ export class AddonNotesListPage implements OnInit, OnDestroy {
             },
         });
 
-        if (typeof modalData != 'undefined') {
+        if (modalData !== undefined) {
 
             if (modalData.sent && modalData.type) {
                 if (modalData.type != this.type) {
diff --git a/src/addons/notes/services/handlers/course-option.ts b/src/addons/notes/services/handlers/course-option.ts
index 80ae7da99..646af845c 100644
--- a/src/addons/notes/services/handlers/course-option.ts
+++ b/src/addons/notes/services/handlers/course-option.ts
@@ -52,7 +52,7 @@ export class AddonNotesCourseOptionHandlerService implements CoreCourseOptionsHa
             return false; // Not enabled for guests.
         }
 
-        if (navOptions && typeof navOptions.notes != 'undefined') {
+        if (navOptions && navOptions.notes !== undefined) {
             return navOptions.notes;
         }
 
diff --git a/src/addons/notes/services/notes-sync.ts b/src/addons/notes/services/notes-sync.ts
index 218b18418..ba85ee026 100644
--- a/src/addons/notes/services/notes-sync.ts
+++ b/src/addons/notes/services/notes-sync.ts
@@ -75,7 +75,7 @@ export class AddonNotesSyncProvider extends CoreSyncBaseProvider<AddonNotesSyncR
                 ? this.syncNotes(courseId, siteId)
                 : this.syncNotesIfNeeded(courseId, siteId));
 
-            if (typeof result != 'undefined') {
+            if (result !== undefined) {
                 // Sync successful, send event.
                 CoreEvents.trigger(AddonNotesSyncProvider.AUTO_SYNCED, {
                     courseId,
diff --git a/src/addons/qtype/ddimageortext/component/ddimageortext.ts b/src/addons/qtype/ddimageortext/component/ddimageortext.ts
index 88d011139..993f64f04 100644
--- a/src/addons/qtype/ddimageortext/component/ddimageortext.ts
+++ b/src/addons/qtype/ddimageortext/component/ddimageortext.ts
@@ -59,7 +59,7 @@ export class AddonQtypeDdImageOrTextComponent extends CoreQuestionBaseComponent
         const ddArea = element.querySelector('.ddarea');
 
         this.ddQuestion.text = CoreDomUtils.getContentsOfElement(element, '.qtext');
-        if (!ddArea || typeof this.ddQuestion.text == 'undefined') {
+        if (!ddArea || this.ddQuestion.text === undefined) {
             this.logger.warn('Aborting because of an error parsing question.', this.ddQuestion.slot);
 
             return CoreQuestionHelper.showComponentError(this.onAbort);
@@ -71,18 +71,18 @@ export class AddonQtypeDdImageOrTextComponent extends CoreQuestionBaseComponent
 
         if (this.ddQuestion.initObjects) {
             // Moodle version = 3.5.
-            if (typeof this.ddQuestion.initObjects.drops != 'undefined') {
+            if (this.ddQuestion.initObjects.drops !== undefined) {
                 this.drops = <unknown[]> this.ddQuestion.initObjects.drops;
             }
-            if (typeof this.ddQuestion.initObjects.readonly != 'undefined') {
+            if (this.ddQuestion.initObjects.readonly !== undefined) {
                 this.ddQuestion.readOnly = !!this.ddQuestion.initObjects.readonly;
             }
         } else if (this.ddQuestion.amdArgs) {
             // Moodle version >= 3.6.
-            if (typeof this.ddQuestion.amdArgs[1] != 'undefined') {
+            if (this.ddQuestion.amdArgs[1] !== undefined) {
                 this.ddQuestion.readOnly = !!this.ddQuestion.amdArgs[1];
             }
-            if (typeof this.ddQuestion.amdArgs[2] != 'undefined') {
+            if (this.ddQuestion.amdArgs[2] !== undefined) {
                 this.drops = <unknown[]> this.ddQuestion.amdArgs[2];
             }
         }
diff --git a/src/addons/qtype/ddmarker/classes/ddmarker.ts b/src/addons/qtype/ddmarker/classes/ddmarker.ts
index a8fca0b21..1e747e0de 100644
--- a/src/addons/qtype/ddmarker/classes/ddmarker.ts
+++ b/src/addons/qtype/ddmarker/classes/ddmarker.ts
@@ -499,7 +499,7 @@ export class AddonQtypeDdMarkerQuestion {
         const dragging = !!this.doc.dragItemBeingDragged(choiceNo);
         const coords: number[][] = [];
 
-        if (fv !== '' && typeof fv != 'undefined' && fv !== null) {
+        if (fv !== '' && fv !== undefined && fv !== null) {
             // Get all the coordinates in the input and add them to the coords list.
             const coordsStrings = fv.split(';');
 
diff --git a/src/addons/qtype/ddmarker/component/ddmarker.ts b/src/addons/qtype/ddmarker/component/ddmarker.ts
index 547773271..27bd8ca14 100644
--- a/src/addons/qtype/ddmarker/component/ddmarker.ts
+++ b/src/addons/qtype/ddmarker/component/ddmarker.ts
@@ -64,7 +64,7 @@ export class AddonQtypeDdMarkerComponent extends CoreQuestionBaseComponent imple
         const ddForm = element.querySelector('.ddform');
 
         this.ddQuestion.text = CoreDomUtils.getContentsOfElement(element, '.qtext');
-        if (!ddArea || !ddForm || typeof this.ddQuestion.text == 'undefined') {
+        if (!ddArea || !ddForm || this.ddQuestion.text === undefined) {
             this.logger.warn('Aborting because of an error parsing question.', this.ddQuestion.slot);
 
             return CoreQuestionHelper.showComponentError(this.onAbort);
@@ -82,10 +82,10 @@ export class AddonQtypeDdMarkerComponent extends CoreQuestionBaseComponent imple
 
         if (this.ddQuestion.initObjects) {
             // Moodle version = 3.5.
-            if (typeof this.ddQuestion.initObjects.dropzones != 'undefined') {
+            if (this.ddQuestion.initObjects.dropzones !== undefined) {
                 this.dropZones = <unknown[]> this.ddQuestion.initObjects.dropzones;
             }
-            if (typeof this.ddQuestion.initObjects.readonly != 'undefined') {
+            if (this.ddQuestion.initObjects.readonly !== undefined) {
                 this.ddQuestion.readOnly = !!this.ddQuestion.initObjects.readonly;
             }
         } else if (this.ddQuestion.amdArgs) {
@@ -97,12 +97,12 @@ export class AddonQtypeDdMarkerComponent extends CoreQuestionBaseComponent imple
                 nextIndex++;
             }
 
-            if (typeof this.ddQuestion.amdArgs[nextIndex] != 'undefined') {
+            if (this.ddQuestion.amdArgs[nextIndex] !== undefined) {
                 this.ddQuestion.readOnly = !!this.ddQuestion.amdArgs[nextIndex];
             }
             nextIndex++;
 
-            if (typeof this.ddQuestion.amdArgs[nextIndex] != 'undefined') {
+            if (this.ddQuestion.amdArgs[nextIndex] !== undefined) {
                 this.dropZones = <unknown[]> this.ddQuestion.amdArgs[nextIndex];
             }
         }
diff --git a/src/addons/qtype/ddwtos/component/ddwtos.ts b/src/addons/qtype/ddwtos/component/ddwtos.ts
index bbafd79cc..befd2c3a3 100644
--- a/src/addons/qtype/ddwtos/component/ddwtos.ts
+++ b/src/addons/qtype/ddwtos/component/ddwtos.ts
@@ -74,7 +74,7 @@ export class AddonQtypeDdwtosComponent extends CoreQuestionBaseComponent impleme
         this.ddQuestion.answers = answerContainer.outerHTML;
 
         this.ddQuestion.text = CoreDomUtils.getContentsOfElement(element, '.qtext');
-        if (typeof this.ddQuestion.text == 'undefined') {
+        if (this.ddQuestion.text === undefined) {
             this.logger.warn('Aborting because of an error parsing question.', this.ddQuestion.slot);
 
             return CoreQuestionHelper.showComponentError(this.onAbort);
diff --git a/src/addons/qtype/essay/component/essay.ts b/src/addons/qtype/essay/component/essay.ts
index 16e1c75d2..64df2a9fc 100644
--- a/src/addons/qtype/essay/component/essay.ts
+++ b/src/addons/qtype/essay/component/essay.ts
@@ -45,7 +45,7 @@ export class AddonQtypeEssayComponent extends CoreQuestionBaseComponent implemen
      * Component being initialized.
      */
     ngOnInit(): void {
-        this.uploadFilesSupported = typeof this.question?.responsefileareas != 'undefined';
+        this.uploadFilesSupported = this.question?.responsefileareas !== undefined;
         this.initEssayComponent(this.review);
         this.essayQuestion = this.question;
 
diff --git a/src/addons/qtype/essay/services/handlers/essay.ts b/src/addons/qtype/essay/services/handlers/essay.ts
index cb6c91646..707c9737e 100644
--- a/src/addons/qtype/essay/services/handlers/essay.ts
+++ b/src/addons/qtype/essay/services/handlers/essay.ts
@@ -143,7 +143,7 @@ export class AddonQtypeEssayHandlerService implements CoreQuestionHandler {
      */
     getPreventSubmitMessage(question: CoreQuestionQuestionParsed): string | undefined {
         const element = CoreDomUtils.convertToElement(question.html);
-        const uploadFilesSupported = typeof question.responsefileareas != 'undefined';
+        const uploadFilesSupported = question.responsefileareas !== undefined;
 
         if (!uploadFilesSupported && element.querySelector('div[id*=filemanager]')) {
             // The question allows attachments. Since the app cannot attach files yet we will prevent submitting the question.
@@ -229,7 +229,7 @@ export class AddonQtypeEssayHandlerService implements CoreQuestionHandler {
     ): number {
 
         const hasTextAnswer = !!answers.answer;
-        const uploadFilesSupported = typeof question.responsefileareas != 'undefined';
+        const uploadFilesSupported = question.responsefileareas !== undefined;
         const allowedOptions = this.getAllowedOptions(question);
 
         if (hasTextAnswer && this.checkInputWordCount(question, <string> answers.answer, undefined)) {
@@ -281,7 +281,7 @@ export class AddonQtypeEssayHandlerService implements CoreQuestionHandler {
         component: string,
         componentId: string | number,
     ): number {
-        if (typeof question.responsefileareas == 'undefined') {
+        if (question.responsefileareas === undefined) {
             return -1;
         }
 
@@ -309,7 +309,7 @@ export class AddonQtypeEssayHandlerService implements CoreQuestionHandler {
         component: string,
         componentId: string | number,
     ): boolean {
-        const uploadFilesSupported = typeof question.responsefileareas != 'undefined';
+        const uploadFilesSupported = question.responsefileareas !== undefined;
         const allowedOptions = this.getAllowedOptions(question);
 
         // First check the inline text.
@@ -355,7 +355,7 @@ export class AddonQtypeEssayHandlerService implements CoreQuestionHandler {
         // Search the textarea to get its name.
         const textarea = <HTMLTextAreaElement> element.querySelector('textarea[name*=_answer]');
 
-        if (textarea && typeof answers[textarea.name] != 'undefined') {
+        if (textarea && answers[textarea.name] !== undefined) {
             await this.prepareTextAnswer(question, answers, textarea, siteId);
         }
 
diff --git a/src/addons/userprofilefield/checkbox/services/handlers/checkbox.ts b/src/addons/userprofilefield/checkbox/services/handlers/checkbox.ts
index 887770465..643738a62 100644
--- a/src/addons/userprofilefield/checkbox/services/handlers/checkbox.ts
+++ b/src/addons/userprofilefield/checkbox/services/handlers/checkbox.ts
@@ -56,7 +56,7 @@ export class AddonUserProfileFieldCheckboxHandlerService implements CoreUserProf
     ): Promise<CoreUserProfileFieldHandlerData | undefined> {
         const name = 'profile_field_' + field.shortname;
 
-        if (typeof formValues[name] != 'undefined') {
+        if (formValues[name] !== undefined) {
             return {
                 type: 'checkbox',
                 name: name,
diff --git a/src/core/classes/base-sync.ts b/src/core/classes/base-sync.ts
index 8849ec24c..417b03ff6 100644
--- a/src/core/classes/base-sync.ts
+++ b/src/core/classes/base-sync.ts
@@ -244,7 +244,7 @@ export class CoreSyncBaseProvider<T = void> {
      * @return Promise resolved when the time is set.
      */
     async setSyncTime(id: string | number, siteId?: string, time?: number): Promise<void> {
-        time = typeof time != 'undefined' ? time : Date.now();
+        time = time !== undefined ? time : Date.now();
 
         await CoreSync.insertOrUpdateSyncRecord(this.component, id, { time: time }, siteId);
     }
diff --git a/src/core/classes/cache.ts b/src/core/classes/cache.ts
index 833ecac56..325669148 100644
--- a/src/core/classes/cache.ts
+++ b/src/core/classes/cache.ts
@@ -58,7 +58,7 @@ export class CoreCache {
     getValue<T = unknown>(id: string, name: string, ignoreInvalidate = false): T | undefined {
         const entry = this.getEntry(id);
 
-        if (entry[name] && typeof entry[name].value != 'undefined') {
+        if (entry[name] && entry[name].value !== undefined) {
             const now = Date.now();
             // Invalidate after 5 minutes.
             if (ignoreInvalidate || entry[name].timemodified + 300000 >= now) {
diff --git a/src/core/classes/delegate.ts b/src/core/classes/delegate.ts
index 3e5e7aac3..588f0ce9f 100644
--- a/src/core/classes/delegate.ts
+++ b/src/core/classes/delegate.ts
@@ -199,7 +199,7 @@ export class CoreDelegate<HandlerType extends CoreDelegateHandler> {
      * @return If the handler is registered or not.
      */
     hasHandler(name: string, enabled: boolean = false): boolean {
-        return enabled ? typeof this.enabledHandlers[name] !== 'undefined' : typeof this.handlers[name] !== 'undefined';
+        return enabled ? this.enabledHandlers[name] !== undefined : this.handlers[name] !== undefined;
     }
 
     /**
@@ -226,7 +226,7 @@ export class CoreDelegate<HandlerType extends CoreDelegateHandler> {
     registerHandler(handler: HandlerType): boolean {
         const key = handler[this.handlerNameProperty] || handler.name;
 
-        if (typeof this.handlers[key] !== 'undefined') {
+        if (this.handlers[key] !== undefined) {
             this.logger.log(`Handler '${handler[this.handlerNameProperty]}' already registered`);
 
             return false;
@@ -293,7 +293,7 @@ export class CoreDelegate<HandlerType extends CoreDelegateHandler> {
      * @return Whether is enabled or disabled in site.
      */
     protected isFeatureDisabled(handler: HandlerType, site: CoreSite): boolean {
-        return typeof this.featurePrefix != 'undefined' && site.isFeatureDisabled(this.featurePrefix + handler.name);
+        return this.featurePrefix !== undefined && site.isFeatureDisabled(this.featurePrefix + handler.name);
     }
 
     /**
diff --git a/src/core/classes/errors/ajaxwserror.ts b/src/core/classes/errors/ajaxwserror.ts
index 338a0706a..b21eedd1b 100644
--- a/src/core/classes/errors/ajaxwserror.ts
+++ b/src/core/classes/errors/ajaxwserror.ts
@@ -41,7 +41,7 @@ export class CoreAjaxWSError extends CoreError {
         this.backtrace = error.backtrace;
 
         this.available = available;
-        if (typeof this.available == 'undefined') {
+        if (this.available === undefined) {
             if (this.errorcode) {
                 this.available = this.errorcode == 'invalidrecord' ? -1 : 1;
             } else {
diff --git a/src/core/classes/interceptor.ts b/src/core/classes/interceptor.ts
index 34c8e4f4d..5ddbe7d11 100644
--- a/src/core/classes/interceptor.ts
+++ b/src/core/classes/interceptor.ts
@@ -53,7 +53,7 @@ export class CoreInterceptor implements HttpInterceptor {
                     innerObj[fullSubName] = subValue;
                     query += this.serialize(innerObj) + '&';
                 }
-            } else if (addNull || (typeof value != 'undefined' && value !== null)) {
+            } else if (addNull || (value !== undefined && value !== null)) {
                 query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&';
             }
         }
diff --git a/src/core/classes/site.ts b/src/core/classes/site.ts
index 201b23ba1..b6f17c472 100644
--- a/src/core/classes/site.ts
+++ b/src/core/classes/site.ts
@@ -355,7 +355,7 @@ export class CoreSite {
      * @return Whether the user authenticated in the site using an OAuth method.
      */
     isOAuth(): boolean {
-        return this.oauthId != null && typeof this.oauthId != 'undefined';
+        return this.oauthId != null && this.oauthId !== undefined;
     }
 
     /**
@@ -366,7 +366,7 @@ export class CoreSite {
     canAccessMyFiles(): boolean {
         const info = this.getInfo();
 
-        return !!(info && (typeof info.usercanmanageownfiles === 'undefined' || info.usercanmanageownfiles));
+        return !!(info && (info.usercanmanageownfiles === undefined || info.usercanmanageownfiles));
     }
 
     /**
@@ -390,7 +390,7 @@ export class CoreSite {
     canUseAdvancedFeature(featureName: string, whenUndefined: boolean = true): boolean {
         const info = this.getInfo();
 
-        if (typeof info?.advancedfeatures === 'undefined') {
+        if (info?.advancedfeatures === undefined) {
             return whenUndefined;
         }
 
@@ -444,13 +444,13 @@ export class CoreSite {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     read<T = unknown>(method: string, data: any, preSets?: CoreSiteWSPreSets): Promise<T> {
         preSets = preSets || {};
-        if (typeof preSets.getFromCache == 'undefined') {
+        if (preSets.getFromCache === undefined) {
             preSets.getFromCache = true;
         }
-        if (typeof preSets.saveToCache == 'undefined') {
+        if (preSets.saveToCache === undefined) {
             preSets.saveToCache = true;
         }
-        if (typeof preSets.reusePending == 'undefined') {
+        if (preSets.reusePending === undefined) {
             preSets.reusePending = true;
         }
 
@@ -468,13 +468,13 @@ export class CoreSite {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     write<T = unknown>(method: string, data: any, preSets?: CoreSiteWSPreSets): Promise<T> {
         preSets = preSets || {};
-        if (typeof preSets.getFromCache == 'undefined') {
+        if (preSets.getFromCache === undefined) {
             preSets.getFromCache = false;
         }
-        if (typeof preSets.saveToCache == 'undefined') {
+        if (preSets.saveToCache === undefined) {
             preSets.saveToCache = false;
         }
-        if (typeof preSets.emergencyCache == 'undefined') {
+        if (preSets.emergencyCache === undefined) {
             preSets.emergencyCache = false;
         }
 
@@ -655,7 +655,7 @@ export class CoreSite {
                     this.saveToCache(method, data, error, preSets);
 
                     throw new CoreWSError(error);
-                } else if (typeof preSets.emergencyCache !== 'undefined' && !preSets.emergencyCache) {
+                } else if (preSets.emergencyCache !== undefined && !preSets.emergencyCache) {
                     this.logger.debug(`WS call '${method}' failed. Emergency cache is forbidden, rejecting.`);
 
                     throw new CoreWSError(error);
@@ -681,7 +681,7 @@ export class CoreSite {
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
         }).then((response: any) => {
             // Check if the response is an error, this happens if the error was stored in the cache.
-            if (response && (typeof response.exception != 'undefined' || typeof response.errorcode != 'undefined')) {
+            if (response && (response.exception !== undefined || response.errorcode !== undefined)) {
                 throw new CoreWSError(response);
             }
 
@@ -857,7 +857,7 @@ export class CoreSite {
                 } else {
                     let responseData = response.data ? CoreTextUtils.parseJSON(response.data) : {};
                     // Match the behaviour of CoreWSProvider.call when no response is expected.
-                    const responseExpected = typeof wsPresets.responseExpected == 'undefined' || wsPresets.responseExpected;
+                    const responseExpected = wsPresets.responseExpected === undefined || wsPresets.responseExpected;
                     if (!responseExpected && (responseData == null || responseData === '')) {
                         responseData = {};
                     }
@@ -938,7 +938,7 @@ export class CoreSite {
             entry = await db.getRecord(CoreSite.WS_CACHE_TABLE, { id });
         }
 
-        if (typeof entry == 'undefined') {
+        if (entry === undefined) {
             throw new CoreError('Cache entry not valid.');
         }
 
@@ -957,7 +957,7 @@ export class CoreSite {
             }
         }
 
-        if (typeof entry.data != 'undefined') {
+        if (entry.data !== undefined) {
             if (!expirationTime) {
                 this.logger.info(`Cached element found, id: ${id}. Expiration time ignored.`);
             } else {
@@ -1206,7 +1206,7 @@ export class CoreSite {
      * @return Fixed URL.
      */
     fixPluginfileURL(url: string): string {
-        const accessKey = this.tokenPluginFileWorks || typeof this.tokenPluginFileWorks == 'undefined' ?
+        const accessKey = this.tokenPluginFileWorks || this.tokenPluginFileWorks === undefined ?
             this.infos && this.infos.userprivateaccesskey : undefined;
 
         return CoreUrlUtils.fixPluginfileURL(url, this.token || '', this.siteUrl, accessKey);
@@ -1829,7 +1829,7 @@ export class CoreSite {
 
             return <T> entry.value;
         } catch (error) {
-            if (typeof defaultValue != 'undefined') {
+            if (defaultValue !== undefined) {
                 return defaultValue;
             }
 
@@ -1876,7 +1876,7 @@ export class CoreSite {
         if (!CoreUrlUtils.canUseTokenPluginFile(url, this.siteUrl, this.infos && this.infos.userprivateaccesskey)) {
             // Cannot use tokenpluginfile.
             return Promise.resolve(false);
-        } else if (typeof this.tokenPluginFileWorks != 'undefined') {
+        } else if (this.tokenPluginFileWorks !== undefined) {
             // Already checked.
             return Promise.resolve(this.tokenPluginFileWorks);
         } else if (this.tokenPluginFileWorksPromise) {
diff --git a/src/core/classes/sqlitedb.ts b/src/core/classes/sqlitedb.ts
index 9455e4c6a..c84c52ccd 100644
--- a/src/core/classes/sqlitedb.ts
+++ b/src/core/classes/sqlitedb.ts
@@ -221,7 +221,7 @@ export class SQLiteDB {
                 columnSql += ` CHECK (${column.check})`;
             }
 
-            if (typeof column.default != 'undefined') {
+            if (column.default !== undefined) {
                 columnSql += ` DEFAULT ${column.default}`;
             }
 
@@ -388,7 +388,7 @@ export class SQLiteDB {
      * @return Promise resolved with the number of affected rows.
      */
     async deleteRecords(table: string, conditions?: SQLiteDBRecordValues): Promise<number> {
-        if (conditions === null || typeof conditions == 'undefined') {
+        if (conditions === null || conditions === undefined) {
             // No conditions, delete the whole table.
             const result = await this.execute(`DELETE FROM ${table}`);
 
@@ -485,7 +485,7 @@ export class SQLiteDB {
 
         // Remove undefined entries and convert null to "NULL".
         for (const name in data) {
-            if (typeof data[name] == 'undefined') {
+            if (data[name] === undefined) {
                 delete data[name];
             }
         }
@@ -581,13 +581,13 @@ export class SQLiteDB {
         let params: SQLiteDBRecordValue[];
 
         // Default behavior, return empty data on empty array.
-        if (Array.isArray(items) && !items.length && typeof onEmptyItems == 'undefined') {
+        if (Array.isArray(items) && !items.length && onEmptyItems === undefined) {
             return { sql: '', params: [] };
         }
 
         // Handle onEmptyItems on empty array of items.
         if (Array.isArray(items) && !items.length) {
-            if (onEmptyItems === null || typeof onEmptyItems === 'undefined') { // Special case, NULL value.
+            if (onEmptyItems === null || onEmptyItems === undefined) { // Special case, NULL value.
                 sql = equal ? ' IS NULL' : ' IS NOT NULL';
 
                 return { sql, params: [] };
@@ -1091,7 +1091,7 @@ export class SQLiteDB {
         for (const key in conditions) {
             const value = conditions[key];
 
-            if (typeof value == 'undefined' || value === null) {
+            if (value === undefined || value === null) {
                 where.push(key + ' IS NULL');
             } else {
                 where.push(key + ' = ?');
@@ -1124,7 +1124,7 @@ export class SQLiteDB {
         let sql = '';
 
         values.forEach((value) => {
-            if (typeof value == 'undefined' || value === null) {
+            if (value === undefined || value === null) {
                 sql = field + ' IS NULL';
             } else {
                 params.push(value);
diff --git a/src/core/classes/tabs.ts b/src/core/classes/tabs.ts
index b03b8f827..76527de07 100644
--- a/src/core/classes/tabs.ts
+++ b/src/core/classes/tabs.ts
@@ -427,7 +427,7 @@ export class CoreTabsBaseComponent<T extends CoreTabBase> implements OnInit, Aft
             this.slides!.slideTo(this.maxSlides);
         } else {
             const currentIndex = await this.slides!.getActiveIndex();
-            if (typeof currentIndex !== 'undefined') {
+            if (currentIndex !== undefined) {
                 const nextSlideIndex = currentIndex + this.maxSlides;
                 this.isInTransition = true;
                 if (nextSlideIndex < this.numTabsShown) {
@@ -456,7 +456,7 @@ export class CoreTabsBaseComponent<T extends CoreTabBase> implements OnInit, Aft
             // Slide to the previous of the latest page.
         } else {
             const currentIndex = await this.slides!.getActiveIndex();
-            if (typeof currentIndex !== 'undefined') {
+            if (currentIndex !== undefined) {
                 const prevSlideIndex = currentIndex - this.maxSlides;
                 this.isInTransition = true;
                 if (prevSlideIndex >= 0) {
diff --git a/src/core/components/chart/chart.ts b/src/core/components/chart/chart.ts
index dbff890ca..cd792d859 100644
--- a/src/core/components/chart/chart.ts
+++ b/src/core/components/chart/chart.ts
@@ -64,7 +64,7 @@ export class CoreChartComponent implements OnDestroy, OnInit, OnChanges {
      */
     async ngOnInit(): Promise<void> {
         let legend: ChartLegendOptions = {};
-        if (typeof this.legend == 'undefined') {
+        if (this.legend === undefined) {
             legend = {
                 display: false,
                 labels: {
diff --git a/src/core/components/chrono/chrono.ts b/src/core/components/chrono/chrono.ts
index 179ad69f8..b111a9b0e 100644
--- a/src/core/components/chrono/chrono.ts
+++ b/src/core/components/chrono/chrono.ts
@@ -102,7 +102,7 @@ export class CoreChronoComponent implements OnInit, OnChanges, OnDestroy {
             this.time += Date.now() - lastExecTime;
             lastExecTime = Date.now();
 
-            if (typeof this.endTime != 'undefined' && this.time > this.endTime) {
+            if (this.endTime !== undefined && this.time > this.endTime) {
                 // End time reached, stop the timer and call the end function.
                 this.stop();
                 this.onEnd.emit();
diff --git a/src/core/components/progress-bar/progress-bar.ts b/src/core/components/progress-bar/progress-bar.ts
index ec65e69bc..ae6f86fcc 100644
--- a/src/core/components/progress-bar/progress-bar.ts
+++ b/src/core/components/progress-bar/progress-bar.ts
@@ -44,7 +44,7 @@ export class CoreProgressBarComponent implements OnChanges {
      * Detect changes on input properties.
      */
     ngOnChanges(changes: { [name: string]: SimpleChange }): void {
-        if (changes.text && typeof changes.text.currentValue != 'undefined') {
+        if (changes.text && changes.text.currentValue !== undefined) {
             // User provided a custom text, don't use default.
             this.textSupplied = true;
         }
diff --git a/src/core/components/tabs-outlet/tabs-outlet.ts b/src/core/components/tabs-outlet/tabs-outlet.ts
index 1783496b4..54da61022 100644
--- a/src/core/components/tabs-outlet/tabs-outlet.ts
+++ b/src/core/components/tabs-outlet/tabs-outlet.ts
@@ -80,7 +80,7 @@ export class CoreTabsOutletComponent extends CoreTabsBaseComponent<CoreTabsOutle
      */
     protected initTab(tab: CoreTabsOutletTab): void {
         tab.id = tab.id || 'core-tab-outlet-' + CoreUtils.getUniqueId('CoreTabsOutletComponent');
-        if (typeof tab.enabled == 'undefined') {
+        if (tab.enabled === undefined) {
             tab.enabled = true;
         }
     }
diff --git a/src/core/directives/format-text.ts b/src/core/directives/format-text.ts
index fdb95c34a..b87e1fbe0 100644
--- a/src/core/directives/format-text.ts
+++ b/src/core/directives/format-text.ts
@@ -460,8 +460,8 @@ export class CoreFormatTextDirective implements OnChanges {
             this.contextInstanceId = site.getSiteHomeId();
         }
 
-        const filter = typeof this.filter == 'undefined' ?
-            !!(this.contextLevel && typeof this.contextInstanceId != 'undefined') : CoreUtils.isTrueOrOne(this.filter);
+        const filter = this.filter === undefined ?
+            !!(this.contextLevel && this.contextInstanceId !== undefined) : CoreUtils.isTrueOrOne(this.filter);
 
         const options: CoreFilterFormatTextOptions = {
             clean: CoreUtils.isTrueOrOne(this.clean),
diff --git a/src/core/directives/link.ts b/src/core/directives/link.ts
index 9687868e2..809934e2b 100644
--- a/src/core/directives/link.ts
+++ b/src/core/directives/link.ts
@@ -58,7 +58,7 @@ export class CoreLinkDirective implements OnInit {
      * Function executed when the component is initialized.
      */
     ngOnInit(): void {
-        this.inApp = typeof this.inApp == 'undefined' ? this.inApp : CoreUtils.isTrueOrOne(this.inApp);
+        this.inApp = this.inApp === undefined ? this.inApp : CoreUtils.isTrueOrOne(this.inApp);
 
         if (this.element.tagName != 'BUTTON' && this.element.tagName != 'A') {
             this.element.setAttribute('tabindex', '0');
@@ -233,7 +233,7 @@ export class CoreLinkDirective implements OnInit {
         } else {
             // Priority order is: core-link inApp attribute > forceOpenLinksIn setting > data-open-in HTML attribute.
             let openInApp = this.inApp;
-            if (typeof this.inApp == 'undefined') {
+            if (this.inApp === undefined) {
                 if (CoreConstants.CONFIG.forceOpenLinksIn == 'browser') {
                     openInApp = false;
                 } else if (CoreConstants.CONFIG.forceOpenLinksIn == 'app' || openIn == 'app') {
diff --git a/src/core/directives/supress-events.ts b/src/core/directives/supress-events.ts
index 0ec7aab2e..559558129 100644
--- a/src/core/directives/supress-events.ts
+++ b/src/core/directives/supress-events.ts
@@ -63,7 +63,7 @@ export class CoreSupressEventsDirective implements OnInit {
 
         let events: string[];
 
-        if (this.suppressEvents == 'all' || typeof this.suppressEvents == 'undefined' || this.suppressEvents === null) {
+        if (this.suppressEvents == 'all' || this.suppressEvents === undefined || this.suppressEvents === null) {
             // Suppress all events.
             events = ['click', 'mousedown', 'touchdown', 'touchmove', 'touchstart'];
 
diff --git a/src/core/features/comments/components/comments/comments.ts b/src/core/features/comments/components/comments/comments.ts
index 8e8683cac..04c45f389 100644
--- a/src/core/features/comments/components/comments/comments.ts
+++ b/src/core/features/comments/components/comments/comments.ts
@@ -211,7 +211,7 @@ export class CoreCommentsCommentsComponent implements OnInit, OnChanges, OnDestr
      * @return Whether it's undefined or equal.
      */
     protected undefinedOrEqual(data: Record<string, unknown>, name: string): boolean {
-        return typeof data[name] == 'undefined' || data[name] == this[name];
+        return data[name] === undefined || data[name] == this[name];
     }
 
 }
diff --git a/src/core/features/comments/pages/viewer/viewer.page.ts b/src/core/features/comments/pages/viewer/viewer.page.ts
index befbfd691..fba333730 100644
--- a/src/core/features/comments/pages/viewer/viewer.page.ts
+++ b/src/core/features/comments/pages/viewer/viewer.page.ts
@@ -163,7 +163,7 @@ export class CoreCommentsViewerPage implements OnInit, OnDestroy {
             this.canAddComments = this.addDeleteCommentsAvailable && !!commentsResponse.canpost;
 
             let comments = commentsResponse.comments.sort((a, b) => a.timecreated - b.timecreated);
-            if (typeof commentsResponse.count != 'undefined') {
+            if (commentsResponse.count !== undefined) {
                 this.canLoadMore = (this.comments.length + comments.length) < commentsResponse.count;
             } else {
                 // Old style.
diff --git a/src/core/features/comments/services/comments-sync.ts b/src/core/features/comments/services/comments-sync.ts
index f402366f8..277c7e651 100644
--- a/src/core/features/comments/services/comments-sync.ts
+++ b/src/core/features/comments/services/comments-sync.ts
@@ -92,7 +92,7 @@ export class CoreCommentsSyncProvider extends CoreSyncBaseProvider<CoreCommentsS
                     siteId,
                 ));
 
-            if (typeof result != 'undefined') {
+            if (result !== undefined) {
                 // Sync successful, send event.
                 CoreEvents.trigger(CoreCommentsSyncProvider.AUTO_SYNCED, {
                     contextLevel: comment.contextlevel,
diff --git a/src/core/features/comments/services/comments.ts b/src/core/features/comments/services/comments.ts
index 094fab2ff..19bbff713 100644
--- a/src/core/features/comments/services/comments.ts
+++ b/src/core/features/comments/services/comments.ts
@@ -395,7 +395,7 @@ export class CoreCommentsProvider {
 
         if (response.comments) {
             // Update pageSize with the greatest count at the moment.
-            if (typeof response.count == 'undefined' && response.comments.length > CoreCommentsProvider.pageSize) {
+            if (response.count === undefined && response.comments.length > CoreCommentsProvider.pageSize) {
                 CoreCommentsProvider.pageSize = response.comments.length;
             }
 
@@ -434,7 +434,7 @@ export class CoreCommentsProvider {
                 const response = await this.getComments(contextLevel, instanceId, component, itemId, area, page, siteId);
                 // Count is only available in 3.8 onwards.
 
-                if (typeof response.count != 'undefined') {
+                if (response.count !== undefined) {
                     trueCount = true;
 
                     return response.count;
diff --git a/src/core/features/contentlinks/classes/module-index-handler.ts b/src/core/features/contentlinks/classes/module-index-handler.ts
index 3cd4da191..5efc4c83a 100644
--- a/src/core/features/contentlinks/classes/module-index-handler.ts
+++ b/src/core/features/contentlinks/classes/module-index-handler.ts
@@ -83,7 +83,7 @@ export class CoreContentLinksModuleIndexHandler extends CoreContentLinksHandlerB
         courseId = Number(courseId || params.courseid || params.cid);
         const pageParams = this.getPageParams(url, params, courseId);
 
-        if (this.instanceIdParam && typeof params[this.instanceIdParam] != 'undefined') {
+        if (this.instanceIdParam && params[this.instanceIdParam] !== undefined) {
             const instanceId = parseInt(params[this.instanceIdParam], 10);
 
             return [{
diff --git a/src/core/features/contentlinks/services/contentlinks-delegate.ts b/src/core/features/contentlinks/services/contentlinks-delegate.ts
index 8c40a4724..eeaab8bbc 100644
--- a/src/core/features/contentlinks/services/contentlinks-delegate.ts
+++ b/src/core/features/contentlinks/services/contentlinks-delegate.ts
@@ -278,7 +278,7 @@ export class CoreContentLinksDelegateService {
      * @return True if registered successfully, false otherwise.
      */
     registerHandler(handler: CoreContentLinksHandler): boolean {
-        if (typeof this.handlers[handler.name] !== 'undefined') {
+        if (this.handlers[handler.name] !== undefined) {
             this.logger.log(`Addon '${handler.name}' already registered`);
 
             return false;
diff --git a/src/core/features/course/classes/module-prefetch-handler.ts b/src/core/features/course/classes/module-prefetch-handler.ts
index e68b13c68..ab9bf9fda 100644
--- a/src/core/features/course/classes/module-prefetch-handler.ts
+++ b/src/core/features/course/classes/module-prefetch-handler.ts
@@ -181,7 +181,7 @@ export class CoreCourseModulePrefetchHandlerBase implements CoreCourseModulePref
      */
     getIntroFilesFromInstance(module: CoreCourseAnyModuleData, instance?: ModuleInstance): CoreWSFile[] {
         if (instance) {
-            if (typeof instance.introfiles != 'undefined') {
+            if (instance.introfiles !== undefined) {
                 return instance.introfiles;
             } else if (instance.intro) {
                 return CoreFilepool.extractDownloadableFilesFromHtmlAsFakeFileObjects(instance.intro);
diff --git a/src/core/features/course/components/format/format.ts b/src/core/features/course/components/format/format.ts
index f351df992..32932b687 100644
--- a/src/core/features/course/components/format/format.ts
+++ b/src/core/features/course/components/format/format.ts
@@ -165,9 +165,9 @@ export class CoreCourseFormatComponent implements OnInit, OnChanges, OnDestroy {
 
             let section: CoreCourseSection | undefined;
 
-            if (typeof data.sectionId != 'undefined' && this.sections) {
+            if (data.sectionId !== undefined && this.sections) {
                 section = this.sections.find((section) => section.id == data.sectionId);
-            } else if (typeof data.sectionNumber != 'undefined' && this.sections) {
+            } else if (data.sectionNumber !== undefined && this.sections) {
                 section = this.sections.find((section) => section.section == data.sectionNumber);
             }
 
@@ -399,7 +399,7 @@ export class CoreCourseFormatComponent implements OnInit, OnChanges, OnDestroy {
             }
         }
 
-        if (this.moduleId && typeof previousValue == 'undefined') {
+        if (this.moduleId && previousValue === undefined) {
             setTimeout(() => {
                 CoreDomUtils.scrollToElementBySelector(
                     this.elementRef.nativeElement,
diff --git a/src/core/features/course/format/weeks/services/handlers/weeks-format.ts b/src/core/features/course/format/weeks/services/handlers/weeks-format.ts
index 4e7682eee..10de07200 100644
--- a/src/core/features/course/format/weeks/services/handlers/weeks-format.ts
+++ b/src/core/features/course/format/weeks/services/handlers/weeks-format.ts
@@ -57,7 +57,7 @@ export class CoreCourseFormatWeeksHandlerService implements CoreCourseFormatHand
 
         for (let i = 0; i < sections.length; i++) {
             const section = sections[i];
-            if (typeof section.section == 'undefined' || section.section < 1) {
+            if (section.section === undefined || section.section < 1) {
                 continue;
             }
 
diff --git a/src/core/features/course/pages/contents/contents.ts b/src/core/features/course/pages/contents/contents.ts
index 1cad013f4..69bbfe521 100644
--- a/src/core/features/course/pages/contents/contents.ts
+++ b/src/core/features/course/pages/contents/contents.ts
@@ -296,7 +296,7 @@ export class CoreCourseContentsPage implements OnInit, OnDestroy {
         if (this.course.enablecompletion !== false) {
             const sectionWithModules = sections.find((section) => section.modules.length > 0);
 
-            if (sectionWithModules && typeof sectionWithModules.modules[0].completion != 'undefined') {
+            if (sectionWithModules && sectionWithModules.modules[0].completion !== undefined) {
                 // The module already has completion (3.6 onwards). Load the offline completion.
                 this.modulesHaveCompletion = true;
 
@@ -396,7 +396,7 @@ export class CoreCourseContentsPage implements OnInit, OnDestroy {
      * @return Promise resolved when done.
      */
     async onCompletionChange(completionData: CoreCourseModuleCompletionData): Promise<void> {
-        const shouldReload = typeof completionData.valueused == 'undefined' || completionData.valueused;
+        const shouldReload = completionData.valueused === undefined || completionData.valueused;
 
         if (!shouldReload) {
             // Invalidate the completion.
diff --git a/src/core/features/course/pages/list-mod-type/list-mod-type.page.ts b/src/core/features/course/pages/list-mod-type/list-mod-type.page.ts
index f24a70c92..735cfc346 100644
--- a/src/core/features/course/pages/list-mod-type/list-mod-type.page.ts
+++ b/src/core/features/course/pages/list-mod-type/list-mod-type.page.ts
@@ -85,7 +85,7 @@ export class CoreCourseListModTypePage implements OnInit {
 
                     if (this.modName === 'resources') {
                         // Check that the module is a resource.
-                        if (typeof this.archetypes[mod.modname] == 'undefined') {
+                        if (this.archetypes[mod.modname] === undefined) {
                             this.archetypes[mod.modname] = CoreCourseModuleDelegate.supportsFeature<number>(
                                 mod.modname,
                                 CoreConstants.FEATURE_MOD_ARCHETYPE,
diff --git a/src/core/features/course/pages/preview/preview.page.ts b/src/core/features/course/pages/preview/preview.page.ts
index b7a6aa5e2..65fd8e105 100644
--- a/src/core/features/course/pages/preview/preview.page.ts
+++ b/src/core/features/course/pages/preview/preview.page.ts
@@ -356,7 +356,7 @@ export class CoreCoursePreviewPage implements OnInit, OnDestroy {
                     },
                 );
 
-                if (typeof modalData != 'undefined') {
+                if (modalData !== undefined) {
                     this.selfEnrolInCourse(modalData, instanceId);
 
                     return;
diff --git a/src/core/features/course/services/course-helper.ts b/src/core/features/course/services/course-helper.ts
index 8d246dcd2..e254f5b2f 100644
--- a/src/core/features/course/services/course-helper.ts
+++ b/src/core/features/course/services/course-helper.ts
@@ -1253,7 +1253,7 @@ export class CoreCourseHelperProvider {
                 const module = section.modules[j];
                 const offlineCompletion = offlineCompletionsMap[module.id];
 
-                if (offlineCompletion && typeof module.completiondata != 'undefined' &&
+                if (offlineCompletion && module.completiondata !== undefined &&
                     offlineCompletion.timecompleted >= module.completiondata.timecompleted * 1000) {
                     // The module has offline completion. Load it.
                     module.completiondata.state = offlineCompletion.completed;
@@ -1771,7 +1771,7 @@ export class CoreCourseHelperProvider {
             promises.push(CoreCourses.getCoursesByField('id', course.id));
 
             const sectionWithModules = sections.find((section) => section.modules && section.modules.length > 0);
-            if (!sectionWithModules || typeof sectionWithModules.modules[0].completion == 'undefined') {
+            if (!sectionWithModules || sectionWithModules.modules[0].completion === undefined) {
                 promises.push(CoreCourse.getActivitiesCompletionStatus(course.id));
             }
 
@@ -1988,7 +1988,7 @@ export class CoreCourseHelperProvider {
             return false;
         }
 
-        return (typeof section.availabilityinfo != 'undefined' && section.availabilityinfo != '') ||
+        return (section.availabilityinfo !== undefined && section.availabilityinfo != '') ||
             section.summary != '' || (section.modules && section.modules.length > 0);
     }
 
diff --git a/src/core/features/course/services/course-options-delegate.ts b/src/core/features/course/services/course-options-delegate.ts
index 87765a546..038b5d51a 100644
--- a/src/core/features/course/services/course-options-delegate.ts
+++ b/src/core/features/course/services/course-options-delegate.ts
@@ -585,7 +585,7 @@ export class CoreCourseOptionsDelegateService extends CoreDelegate<CoreCourseOpt
      * @return Promise resolved when done.
      */
     protected async loadCourseOptions(course: CoreCourseAnyCourseDataWithOptions, refresh = false): Promise<void> {
-        if (typeof course.navOptions == 'undefined' || typeof course.admOptions == 'undefined' || refresh) {
+        if (course.navOptions === undefined || course.admOptions === undefined || refresh) {
 
             const options = await CoreCourses.getCoursesAdminAndNavOptions([course.id]);
             course.navOptions = options.navOptions[course.id];
diff --git a/src/core/features/course/services/course.ts b/src/core/features/course/services/course.ts
index 3d440e2a8..c8da4ec5f 100644
--- a/src/core/features/course/services/course.ts
+++ b/src/core/features/course/services/course.ts
@@ -293,7 +293,7 @@ export class CoreCourseProvider {
 
             offlineCompletions.forEach((offlineCompletion) => {
 
-                if (offlineCompletion && typeof completionStatus[offlineCompletion.cmid] != 'undefined') {
+                if (offlineCompletion && completionStatus[offlineCompletion.cmid] !== undefined) {
                     const onlineCompletion = completionStatus[offlineCompletion.cmid];
 
                     // If the activity uses manual completion, override the value with the offline one.
@@ -992,7 +992,7 @@ export class CoreCourseProvider {
         };
         const wsName = 'core_course_view_course';
 
-        if (typeof sectionNumber != 'undefined') {
+        if (sectionNumber !== undefined) {
             params.sectionnumber = sectionNumber;
         }
 
@@ -1135,7 +1135,7 @@ export class CoreCourseProvider {
         // Wait for site plugins to be fetched.
         await CoreUtils.ignoreErrors(CoreSitePlugins.waitFetchPlugins());
 
-        if (!('format' in course) || typeof course.format == 'undefined') {
+        if (!('format' in course) || course.format === undefined) {
             const result = await CoreCourseHelper.getCourse(course.id);
 
             course = result.course;
@@ -1255,7 +1255,7 @@ export class CoreCourseProvider {
 
         try {
             const entry = await this.getCourseStatusData(courseId, siteId);
-            if (typeof downloadTime == 'undefined') {
+            if (downloadTime === undefined) {
                 // Keep previous download time.
                 downloadTime = entry.downloadTime;
                 previousDownloadTime = entry.previousDownloadTime;
diff --git a/src/core/features/course/services/module-prefetch-delegate.ts b/src/core/features/course/services/module-prefetch-delegate.ts
index f835799eb..e1166739b 100644
--- a/src/core/features/course/services/module-prefetch-delegate.ts
+++ b/src/core/features/course/services/module-prefetch-delegate.ts
@@ -392,7 +392,7 @@ export class CoreCourseModulePrefetchDelegateService extends CoreDelegate<CoreCo
 
         const packageId = CoreFilepool.getPackageId(handler.component, module.id);
         const downloadSize = this.statusCache.getValue<CoreFileSizeSum>(packageId, 'downloadSize');
-        if (typeof downloadSize != 'undefined') {
+        if (downloadSize !== undefined) {
             return downloadSize;
         }
 
@@ -430,7 +430,7 @@ export class CoreCourseModulePrefetchDelegateService extends CoreDelegate<CoreCo
 
         const packageId = CoreFilepool.getPackageId(handler.component, module.id);
         const downloadedSize = this.statusCache.getValue<number>(packageId, 'downloadedSize');
-        if (typeof downloadedSize != 'undefined') {
+        if (downloadedSize !== undefined) {
             return downloadedSize;
         }
 
@@ -558,7 +558,7 @@ export class CoreCourseModulePrefetchDelegateService extends CoreDelegate<CoreCo
         const packageId = CoreFilepool.getPackageId(handler.component, module.id);
         const status = this.statusCache.getValue<string>(packageId, 'status');
 
-        if (!refresh && typeof status != 'undefined') {
+        if (!refresh && status !== undefined) {
             this.storeCourseAndSection(packageId, courseId, sectionId);
 
             return this.determineModuleStatus(module, status);
@@ -612,7 +612,7 @@ export class CoreCourseModulePrefetchDelegateService extends CoreDelegate<CoreCo
         }
 
         // Module is downloaded. Determine if there are updated in the module to show them outdated.
-        if (typeof updates == 'undefined') {
+        if (updates === undefined) {
             try {
                 // We don't have course updates, calculate them.
                 updates = await this.getCourseUpdatesByCourseId(courseId);
@@ -729,7 +729,7 @@ export class CoreCourseModulePrefetchDelegateService extends CoreDelegate<CoreCo
             } catch (error) {
                 const packageId = CoreFilepool.getPackageId(handler.component, module.id);
                 const cacheStatus = this.statusCache.getValue<string>(packageId, 'status', true);
-                if (typeof cacheStatus == 'undefined') {
+                if (cacheStatus === undefined) {
                     throw error;
                 }
 
@@ -769,7 +769,7 @@ export class CoreCourseModulePrefetchDelegateService extends CoreDelegate<CoreCo
         const packageId = CoreFilepool.getPackageId(handler.component, module.id);
         const status = this.statusCache.getValue<string>(packageId, 'status');
 
-        if (typeof status != 'undefined' && !CoreFileHelper.isStateDownloaded(status)) {
+        if (status !== undefined && !CoreFileHelper.isStateDownloaded(status)) {
             // Module isn't downloaded, just return the status.
             return { status };
         }
@@ -976,7 +976,7 @@ export class CoreCourseModulePrefetchDelegateService extends CoreDelegate<CoreCo
         const packageId = CoreFilepool.getPackageId(handler.component, module.id);
         let downloadable = this.statusCache.getValue<boolean>(packageId, 'downloadable');
 
-        if (typeof downloadable != 'undefined') {
+        if (downloadable !== undefined) {
             return downloadable;
         }
 
diff --git a/src/core/features/courses/components/course-progress/course-progress.ts b/src/core/features/courses/components/course-progress/course-progress.ts
index 7b1e37c7b..9d295b906 100644
--- a/src/core/features/courses/components/course-progress/course-progress.ts
+++ b/src/core/features/courses/components/course-progress/course-progress.ts
@@ -82,7 +82,7 @@ export class CoreCoursesCourseProgressComponent implements OnInit, OnDestroy, On
 
         // This field is only available from 3.6 onwards.
         this.courseOptionMenuEnabled = this.showAll && 'isfavourite' in this.course &&
-            typeof this.course.isfavourite != 'undefined';
+            this.course.isfavourite !== undefined;
 
         // Refresh the enabled flag if site is updated.
         this.siteUpdatedObserver = CoreEvents.on(CoreEvents.SITE_UPDATED, () => {
diff --git a/src/core/features/courses/services/courses-helper.ts b/src/core/features/courses/services/courses-helper.ts
index 62f98ed70..aa794077b 100644
--- a/src/core/features/courses/services/courses-helper.ts
+++ b/src/core/features/courses/services/courses-helper.ts
@@ -270,12 +270,12 @@ export class CoreCoursesHelperProvider {
         courses = slice > 0 ? courses.slice(0, slice) : courses;
 
         return Promise.all(courses.map(async (course) => {
-            if (typeof course.completed != 'undefined') {
+            if (course.completed !== undefined) {
                 // The WebService already returns the completed status, no need to fetch it.
                 return course;
             }
 
-            if (typeof course.enablecompletion != 'undefined' && !course.enablecompletion) {
+            if (course.enablecompletion !== undefined && !course.enablecompletion) {
                 // Completion is disabled for this course, there is no need to fetch the completion status.
                 return course;
             }
diff --git a/src/core/features/courses/services/courses.ts b/src/core/features/courses/services/courses.ts
index 002d3fc28..a724803f0 100644
--- a/src/core/features/courses/services/courses.ts
+++ b/src/core/features/courses/services/courses.ts
@@ -524,15 +524,15 @@ export class CoreCoursesProvider {
 
         // Courses will be sorted using sortorder if available.
         return response.courses.sort((a, b) => {
-            if (typeof a.sortorder == 'undefined' && typeof b.sortorder == 'undefined') {
+            if (a.sortorder === undefined && b.sortorder === undefined) {
                 return b.id - a.id;
             }
 
-            if (typeof a.sortorder == 'undefined') {
+            if (a.sortorder === undefined) {
                 return 1;
             }
 
-            if (typeof b.sortorder == 'undefined') {
+            if (b.sortorder === undefined) {
                 return -1;
             }
 
diff --git a/src/core/features/courses/services/handlers/course-link.ts b/src/core/features/courses/services/handlers/course-link.ts
index dfe5426a7..5e1800ddb 100644
--- a/src/core/features/courses/services/handlers/course-link.ts
+++ b/src/core/features/courses/services/handlers/course-link.ts
@@ -65,7 +65,7 @@ export class CoreCoursesCourseLinkHandlerService extends CoreContentLinksHandler
         const pageParams: Params = {
             sectionId: sectionId || null,
         };
-        let sectionNumber = typeof params.section != 'undefined' ? parseInt(params.section, 10) : NaN;
+        let sectionNumber = params.section !== undefined ? parseInt(params.section, 10) : NaN;
 
         if (!sectionId && !sectionNumber) {
             // Check if the URL has a hash to navigate to the section.
@@ -294,7 +294,7 @@ export class CoreCoursesCourseLinkHandlerService extends CoreContentLinksHandler
                 let body = ' '; // Empty message.
                 const placeholder = Translate.instant('core.courses.password');
 
-                if (typeof password != 'undefined') {
+                if (password !== undefined) {
                     // The user attempted a password. Show an error message.
                     body = CoreTextUtils.getErrorMessageFromError(error) || body;
                 }
diff --git a/src/core/features/editor/components/rich-text-editor/rich-text-editor.ts b/src/core/features/editor/components/rich-text-editor/rich-text-editor.ts
index 84c2931ef..2b82866d7 100644
--- a/src/core/features/editor/components/rich-text-editor/rich-text-editor.ts
+++ b/src/core/features/editor/components/rich-text-editor/rich-text-editor.ts
@@ -484,7 +484,7 @@ export class CoreEditorRichTextEditorComponent implements OnInit, AfterContentIn
         };
 
         let range = document.createRange();
-        if (typeof chars === 'undefined') {
+        if (chars === undefined) {
             // Select all so it will go to the end.
             range.selectNode(parent);
             range.selectNodeContents(parent);
@@ -601,7 +601,7 @@ export class CoreEditorRichTextEditorComponent implements OnInit, AfterContentIn
      * @param value text
      */
     protected isNullOrWhiteSpace(value: string | null): boolean {
-        if (value == null || typeof value == 'undefined') {
+        if (value == null || value === undefined) {
             return true;
         }
 
@@ -926,10 +926,10 @@ export class CoreEditorRichTextEditorComponent implements OnInit, AfterContentIn
      */
     protected shouldAutoSaveDrafts(): boolean {
         return !!CoreSites.getCurrentSite() &&
-                (typeof this.autoSave == 'undefined' || CoreUtils.isTrueOrOne(this.autoSave)) &&
-                typeof this.contextLevel != 'undefined' &&
-                typeof this.contextInstanceId != 'undefined' &&
-                typeof this.elementId != 'undefined';
+                (this.autoSave === undefined || CoreUtils.isTrueOrOne(this.autoSave)) &&
+                this.contextLevel !== undefined &&
+                this.contextInstanceId !== undefined &&
+                this.elementId !== undefined;
     }
 
     /**
@@ -948,7 +948,7 @@ export class CoreEditorRichTextEditorComponent implements OnInit, AfterContentIn
                 this.originalContent,
             );
 
-            if (typeof entry == 'undefined') {
+            if (entry === undefined) {
                 // No draft found.
                 return;
             }
diff --git a/src/core/features/emulator/services/capture-helper.ts b/src/core/features/emulator/services/capture-helper.ts
index daee4b3d7..a65ebca93 100644
--- a/src/core/features/emulator/services/capture-helper.ts
+++ b/src/core/features/emulator/services/capture-helper.ts
@@ -192,7 +192,7 @@ export class CoreEmulatorCaptureHelperProvider {
      * @return Promise resolved when loaded.
      */
     load(): Promise<void> {
-        if (typeof window.MediaRecorder != 'undefined' && this.initGetUserMedia()) {
+        if (window.MediaRecorder !== undefined && this.initGetUserMedia()) {
             this.initMimeTypes();
         }
 
diff --git a/src/core/features/emulator/services/file.ts b/src/core/features/emulator/services/file.ts
index bde3461bd..71eae6136 100644
--- a/src/core/features/emulator/services/file.ts
+++ b/src/core/features/emulator/services/file.ts
@@ -344,10 +344,10 @@ export class FileMock extends File {
             // eslint-disable-next-line @typescript-eslint/no-explicit-any
             const win = <any> window; // Convert to <any> to be able to use non-standard properties.
 
-            if (typeof win.requestFileSystem == 'undefined') {
+            if (win.requestFileSystem === undefined) {
                 win.requestFileSystem = win.webkitRequestFileSystem;
             }
-            if (typeof win.resolveLocalFileSystemURL == 'undefined') {
+            if (win.resolveLocalFileSystemURL === undefined) {
                 win.resolveLocalFileSystemURL = win.webkitResolveLocalFileSystemURL;
             }
             win.LocalFileSystem = {
diff --git a/src/core/features/fileuploader/services/fileuploader-helper.ts b/src/core/features/fileuploader/services/fileuploader-helper.ts
index b00769de3..33b70931d 100644
--- a/src/core/features/fileuploader/services/fileuploader-helper.ts
+++ b/src/core/features/fileuploader/services/fileuploader-helper.ts
@@ -123,8 +123,8 @@ export class CoreFileUploaderHelperProvider {
             throw new CoreError(Translate.instant('core.fileuploader.errormustbeonlinetoupload'));
         }
 
-        wifiThreshold = typeof wifiThreshold == 'undefined' ? CoreFileUploaderProvider.WIFI_SIZE_WARNING : wifiThreshold;
-        limitedThreshold = typeof limitedThreshold == 'undefined' ?
+        wifiThreshold = wifiThreshold === undefined ? CoreFileUploaderProvider.WIFI_SIZE_WARNING : wifiThreshold;
+        limitedThreshold = limitedThreshold === undefined ?
             CoreFileUploaderProvider.LIMITED_SIZE_WARNING : limitedThreshold;
 
         if (size < 0) {
@@ -203,7 +203,7 @@ export class CoreFileUploaderHelperProvider {
         const fileName = options?.fileName || CoreFile.getFileAndDirectoryFromPath(path).name;
 
         // Check that size isn't too large.
-        if (typeof maxSize != 'undefined' && maxSize != -1) {
+        if (maxSize !== undefined && maxSize != -1) {
             try {
                 const fileEntry = await CoreFile.getExternalFile(path);
 
diff --git a/src/core/features/filter/services/filter.ts b/src/core/features/filter/services/filter.ts
index 4b7dd89ca..e413084d5 100644
--- a/src/core/features/filter/services/filter.ts
+++ b/src/core/features/filter/services/filter.ts
@@ -205,11 +205,11 @@ export class CoreFilterProvider {
         // Clone object if needed so we can modify it.
         options = options ? Object.assign({}, options) : {};
 
-        if (typeof options.clean == 'undefined') {
+        if (options.clean === undefined) {
             options.clean = false;
         }
 
-        if (typeof options.filter == 'undefined') {
+        if (options.filter === undefined) {
             options.filter = true;
         }
 
diff --git a/src/core/features/grades/services/grades-helper.ts b/src/core/features/grades/services/grades-helper.ts
index 319dc9313..b602a8df5 100644
--- a/src/core/features/grades/services/grades-helper.ts
+++ b/src/core/features/grades/services/grades-helper.ts
@@ -184,13 +184,13 @@ export class CoreGradesHelperProvider {
         let normalRow = formatted.rows.find(
             row =>
                 row.itemtype != 'leader' &&
-                (typeof row.grade != 'undefined' || typeof row.percentage != 'undefined'),
+                (row.grade !== undefined || row.percentage !== undefined),
         );
 
         // Decide if grades or percentage is being shown on phones.
-        if (normalRow && typeof normalRow.grade != 'undefined') {
+        if (normalRow && normalRow.grade !== undefined) {
             columns.grade = true;
-        } else if (normalRow && typeof normalRow.percentage != 'undefined') {
+        } else if (normalRow && normalRow.percentage !== undefined) {
             columns.percentage = true;
         } else {
             normalRow = formatted.rows.find((e) => e.itemtype != 'leader');
@@ -198,7 +198,7 @@ export class CoreGradesHelperProvider {
         }
 
         for (const colName in columns) {
-            if (normalRow && typeof normalRow[colName] != 'undefined') {
+            if (normalRow && normalRow[colName] !== undefined) {
                 formatted.columns.push({
                     name: colName,
                     colspan: colName == 'gradeitem' ? maxDepth : 1,
@@ -562,7 +562,7 @@ export class CoreGradesHelperProvider {
             row.iconAlt = Translate.instant('core.grades.calculatedgrade');
         } else if (text.indexOf('/mod/') > -1) {
             const module = text.match(/mod\/([^/]*)\//);
-            if (typeof module?.[1] != 'undefined') {
+            if (module?.[1] !== undefined) {
                 row.itemtype = 'mod';
                 row.itemmodule = module[1];
                 row.iconAlt = CoreCourse.translateModuleName(row.itemmodule) || '';
@@ -613,7 +613,7 @@ export class CoreGradesHelperProvider {
         defaultValue: string | number = '',
         scale?: string,
     ): Promise<CoreGradesMenuItem[]> {
-        if (typeof gradingType == 'undefined') {
+        if (gradingType === undefined) {
             return [];
         }
 
diff --git a/src/core/features/grades/services/grades.ts b/src/core/features/grades/services/grades.ts
index 00280957d..80b588e8a 100644
--- a/src/core/features/grades/services/grades.ts
+++ b/src/core/features/grades/services/grades.ts
@@ -318,7 +318,7 @@ export class CoreGradesProvider {
 
         const course = await CoreCourses.getUserCourse(courseId, true, siteId);
 
-        return !(course && typeof course.showgrades != 'undefined' && !course.showgrades);
+        return !(course && course.showgrades !== undefined && !course.showgrades);
     }
 
     /**
diff --git a/src/core/features/grades/services/handlers/course-option.ts b/src/core/features/grades/services/handlers/course-option.ts
index d3954b748..21fb0053b 100644
--- a/src/core/features/grades/services/handlers/course-option.ts
+++ b/src/core/features/grades/services/handlers/course-option.ts
@@ -41,7 +41,7 @@ export class CoreGradesCourseOptionHandlerService implements CoreCourseOptionsHa
      * @return Promise resolved when done.
      */
     invalidateEnabledForCourse(courseId: number, navOptions?: CoreCourseUserAdminOrNavOptionIndexed): Promise<void> {
-        if (navOptions && typeof navOptions.grades != 'undefined') {
+        if (navOptions && navOptions.grades !== undefined) {
             // No need to invalidate anything.
             return Promise.resolve();
         }
@@ -75,7 +75,7 @@ export class CoreGradesCourseOptionHandlerService implements CoreCourseOptionsHa
             return false; // Not enabled for guests.
         }
 
-        if (navOptions && typeof navOptions.grades != 'undefined') {
+        if (navOptions && navOptions.grades !== undefined) {
             return navOptions.grades;
         }
 
diff --git a/src/core/features/h5p/classes/content-validator.ts b/src/core/features/h5p/classes/content-validator.ts
index fb3468d5c..e3e916ba6 100644
--- a/src/core/features/h5p/classes/content-validator.ts
+++ b/src/core/features/h5p/classes/content-validator.ts
@@ -91,7 +91,7 @@ export class CoreH5PContentValidator {
         const group = CoreUtils.clone(metadata || {});
 
         // Stop complaining about "invalid selected option in select" for old content without license chosen.
-        if (typeof group.license == 'undefined') {
+        if (group.license === undefined) {
             group.license = 'U';
         }
 
@@ -168,7 +168,7 @@ export class CoreH5PContentValidator {
         }
 
         // Check if string is within allowed length.
-        if (typeof semantics.maxLength != 'undefined') {
+        if (semantics.maxLength !== undefined) {
             text = text.substr(0, semantics.maxLength);
         }
 
@@ -202,22 +202,22 @@ export class CoreH5PContentValidator {
             num = 0;
         }
         // Check if number is within valid bounds. Move within bounds if not.
-        if (typeof semantics.min != 'undefined' && num < semantics.min) {
+        if (semantics.min !== undefined && num < semantics.min) {
             num = semantics.min;
         }
-        if (typeof semantics.max != 'undefined' && num > semantics.max) {
+        if (semantics.max !== undefined && num > semantics.max) {
             num = semantics.max;
         }
         // Check if number is within allowed bounds even if step value is set.
-        if (typeof semantics.step != 'undefined') {
-            const testNumber = num - (typeof semantics.min != 'undefined' ? semantics.min : 0);
+        if (semantics.step !== undefined) {
+            const testNumber = num - (semantics.min !== undefined ? semantics.min : 0);
             const rest = testNumber % semantics.step;
             if (rest !== 0) {
                 num -= rest;
             }
         }
         // Check if number has proper number of decimals.
-        if (typeof semantics.decimals != 'undefined') {
+        if (semantics.decimals !== undefined) {
             num = Number(num.toFixed(semantics.decimals));
         }
 
@@ -303,7 +303,7 @@ export class CoreH5PContentValidator {
         let keys = Object.keys(list);
 
         // Check that list is not longer than allowed length.
-        if (typeof semantics.max != 'undefined') {
+        if (semantics.max !== undefined) {
             keys = keys.slice(0, semantics.max);
         }
 
@@ -392,8 +392,8 @@ export class CoreH5PContentValidator {
             file.bitrate = parseInt(file.bitrate, 10);
         }
 
-        if (typeof file.quality != 'undefined') {
-            if (file.quality === null || typeof file.quality.level == 'undefined' || typeof file.quality.label == 'undefined') {
+        if (file.quality !== undefined) {
+            if (file.quality === null || file.quality.level === undefined || file.quality.label === undefined) {
                 delete file.quality;
             } else {
                 this.filterParams(file.quality, ['level', 'label']);
@@ -402,7 +402,7 @@ export class CoreH5PContentValidator {
             }
         }
 
-        if (typeof file.copyright != 'undefined') {
+        if (file.copyright !== undefined) {
             await this.validateGroup(file.copyright, this.getCopyrightSemantics());
         }
 
diff --git a/src/core/features/h5p/classes/core.ts b/src/core/features/h5p/classes/core.ts
index 6ba4aeec8..ac6dddb45 100644
--- a/src/core/features/h5p/classes/core.ts
+++ b/src/core/features/h5p/classes/core.ts
@@ -241,7 +241,7 @@ export class CoreH5PCore {
             return content.filtered;
         }
 
-        if (typeof content.library == 'undefined' || typeof content.params == 'undefined') {
+        if (content.library === undefined || content.params === undefined) {
             return null;
         }
 
diff --git a/src/core/features/h5p/classes/framework.ts b/src/core/features/h5p/classes/framework.ts
index cfb77cac5..6386d853e 100644
--- a/src/core/features/h5p/classes/framework.ts
+++ b/src/core/features/h5p/classes/framework.ts
@@ -388,7 +388,7 @@ export class CoreH5PFramework {
      * @return Library parameter values separated by ', '
      */
     libraryParameterValuesToCsv(libraryData: CoreH5PLibraryBeingSaved, key: string, searchParam: string = 'path'): string {
-        if (typeof libraryData[key] != 'undefined') {
+        if (libraryData[key] !== undefined) {
             const parameterValues: string[] = [];
 
             libraryData[key].forEach((file) => {
@@ -489,7 +489,7 @@ export class CoreH5PFramework {
             params.metadata.title = params.title;
         }
         content.metadata = params.metadata;
-        content.params = JSON.stringify(typeof params.params != 'undefined' && params.params != null ? params.params : params);
+        content.params = JSON.stringify(params.params !== undefined && params.params != null ? params.params : params);
 
         return content;
     }
@@ -690,15 +690,15 @@ export class CoreH5PFramework {
         const preloadedCSS = this.libraryParameterValuesToCsv(libraryData, 'preloadedCss', 'path');
         const dropLibraryCSS = this.libraryParameterValuesToCsv(libraryData, 'dropLibraryCss', 'machineName');
 
-        if (typeof libraryData.semantics == 'undefined') {
+        if (libraryData.semantics === undefined) {
             libraryData.semantics = [];
         }
-        if (typeof libraryData.fullscreen == 'undefined') {
+        if (libraryData.fullscreen === undefined) {
             libraryData.fullscreen = 0;
         }
 
         let embedTypes = '';
-        if (typeof libraryData.embedTypes != 'undefined') {
+        if (libraryData.embedTypes !== undefined) {
             embedTypes = libraryData.embedTypes.join(', ');
         }
 
@@ -717,9 +717,9 @@ export class CoreH5PFramework {
             preloadedjs: preloadedJS,
             preloadedcss: preloadedCSS,
             droplibrarycss: dropLibraryCSS,
-            semantics: typeof libraryData.semantics != 'undefined' ? JSON.stringify(libraryData.semantics) : null,
-            addto: typeof libraryData.addTo != 'undefined' ? JSON.stringify(libraryData.addTo) : null,
-            metadatasettings: typeof libraryData.metadataSettings != 'undefined' ?
+            semantics: libraryData.semantics !== undefined ? JSON.stringify(libraryData.semantics) : null,
+            addto: libraryData.addTo !== undefined ? JSON.stringify(libraryData.addTo) : null,
+            metadatasettings: libraryData.metadataSettings !== undefined ?
                 CoreH5PMetadata.boolifyAndEncodeSettings(libraryData.metadataSettings) : null,
         };
 
@@ -841,7 +841,7 @@ export class CoreH5PFramework {
         const db = await CoreSites.getSiteDb(siteId);
 
         // If the libraryid declared in the package is empty, get the latest version.
-        if (content.library && typeof content.library.libraryId == 'undefined') {
+        if (content.library && content.library.libraryId === undefined) {
             const mainLibrary = await this.getLatestLibraryVersion(content.library.machineName, siteId);
 
             content.library.libraryId = mainLibrary.id;
@@ -867,7 +867,7 @@ export class CoreH5PFramework {
         };
         let contentId: number | undefined;
 
-        if (typeof content.id != 'undefined') {
+        if (content.id !== undefined) {
             data.id = content.id;
             contentId = content.id;
         } else {
diff --git a/src/core/features/h5p/classes/metadata.ts b/src/core/features/h5p/classes/metadata.ts
index 359b0af26..b0639e57d 100644
--- a/src/core/features/h5p/classes/metadata.ts
+++ b/src/core/features/h5p/classes/metadata.ts
@@ -32,10 +32,10 @@ export class CoreH5PMetadata {
         }
 
         // Convert metadataSettings values to boolean.
-        if (typeof metadataSettings.disable != 'undefined') {
+        if (metadataSettings.disable !== undefined) {
             metadataSettings.disable = metadataSettings.disable === 1;
         }
-        if (typeof metadataSettings.disableExtraTitleField != 'undefined') {
+        if (metadataSettings.disableExtraTitleField !== undefined) {
             metadataSettings.disableExtraTitleField = metadataSettings.disableExtraTitleField === 1;
         }
 
diff --git a/src/core/features/h5p/classes/storage.ts b/src/core/features/h5p/classes/storage.ts
index c79bdd305..984dd022d 100644
--- a/src/core/features/h5p/classes/storage.ts
+++ b/src/core/features/h5p/classes/storage.ts
@@ -94,7 +94,7 @@ export class CoreH5PStorage {
                 throw error;
             }
 
-            if (typeof libraryData.libraryId != 'undefined') {
+            if (libraryData.libraryId !== undefined) {
                 const promises: Promise<void>[] = [];
 
                 // Remove all indexes of contents that use this library.
@@ -127,17 +127,17 @@ export class CoreH5PStorage {
             // Insert the different new ones.
             const promises: Promise<void>[] = [];
 
-            if (typeof libraryData.preloadedDependencies != 'undefined') {
+            if (libraryData.preloadedDependencies !== undefined) {
                 promises.push(this.h5pFramework.saveLibraryDependencies(
                     libraryData,
                     libraryData.preloadedDependencies,
                     'preloaded',
                 ));
             }
-            if (typeof libraryData.dynamicDependencies != 'undefined') {
+            if (libraryData.dynamicDependencies !== undefined) {
                 promises.push(this.h5pFramework.saveLibraryDependencies(libraryData, libraryData.dynamicDependencies, 'dynamic'));
             }
-            if (typeof libraryData.editorDependencies != 'undefined') {
+            if (libraryData.editorDependencies !== undefined) {
                 promises.push(this.h5pFramework.saveLibraryDependencies(libraryData, libraryData.editorDependencies, 'editor'));
             }
 
diff --git a/src/core/features/h5p/classes/validator.ts b/src/core/features/h5p/classes/validator.ts
index ac300f409..b95399f4b 100644
--- a/src/core/features/h5p/classes/validator.ts
+++ b/src/core/features/h5p/classes/validator.ts
@@ -65,13 +65,13 @@ export class CoreH5PValidator {
         const missing: Record<string, CoreH5PMissingLibrary> = {};
 
         Object.values(libraries).forEach((library) => {
-            if (typeof library.preloadedDependencies !== 'undefined') {
+            if (library.preloadedDependencies !== undefined) {
                 Object.assign(missing, this.getMissingDependencies(library.preloadedDependencies, library, libraries));
             }
-            if (typeof library.dynamicDependencies !== 'undefined') {
+            if (library.dynamicDependencies !== undefined) {
                 Object.assign(missing, this.getMissingDependencies(library.dynamicDependencies, library, libraries));
             }
-            if (typeof library.editorDependencies !== 'undefined') {
+            if (library.editorDependencies !== undefined) {
                 Object.assign(missing, this.getMissingDependencies(library.editorDependencies, library, libraries));
             }
         });
diff --git a/src/core/features/login/pages/email-signup/email-signup.ts b/src/core/features/login/pages/email-signup/email-signup.ts
index 02812cc92..794e81e1d 100644
--- a/src/core/features/login/pages/email-signup/email-signup.ts
+++ b/src/core/features/login/pages/email-signup/email-signup.ts
@@ -165,7 +165,7 @@ export class CoreLoginEmailSignupPage implements OnInit {
 
             if (this.treatSiteConfig()) {
                 // Check content verification.
-                if (typeof this.ageDigitalConsentVerification == 'undefined') {
+                if (this.ageDigitalConsentVerification === undefined) {
 
                     const result = await CoreUtils.ignoreErrors(
                         CoreWS.callAjax<IsAgeVerificationEnabledWSResponse>(
diff --git a/src/core/features/login/services/login-helper.ts b/src/core/features/login/services/login-helper.ts
index 627547671..ec3052968 100644
--- a/src/core/features/login/services/login-helper.ts
+++ b/src/core/features/login/services/login-helper.ts
@@ -323,7 +323,7 @@ export class CoreLoginHelperProvider {
      * @return OAuth ID.
      */
     getOAuthIdFromParams(params?: CoreUrlParams): number | undefined {
-        return params && typeof params.oauthsso != 'undefined' ? Number(params.oauthsso) : undefined;
+        return params && params.oauthsso !== undefined ? Number(params.oauthsso) : undefined;
     }
 
     /**
@@ -530,7 +530,7 @@ export class CoreLoginHelperProvider {
      * @return Whether email signup is disabled.
      */
     isFeatureDisabled(feature: string, config?: CoreSitePublicConfigResponse, disabledFeatures?: string): boolean {
-        if (typeof disabledFeatures == 'undefined') {
+        if (disabledFeatures === undefined) {
             disabledFeatures = this.getDisabledFeatures(config);
         }
 
@@ -978,7 +978,7 @@ export class CoreLoginHelperProvider {
                 }
 
                 const info = currentSite.getInfo();
-                if (typeof info != 'undefined' && typeof info.username != 'undefined') {
+                if (info !== undefined && info.username !== undefined) {
                     // If current page is already reconnect, stop.
                     if (CoreNavigator.isCurrent('/login/reconnect')) {
                         return;
@@ -1249,7 +1249,7 @@ export class CoreLoginHelperProvider {
      * @return Whether the QR reader should be displayed in site screen.
      */
     displayQRInSiteScreen(): boolean {
-        return CoreUtils.canScanQR() && (typeof CoreConstants.CONFIG.displayqronsitescreen == 'undefined' ||
+        return CoreUtils.canScanQR() && (CoreConstants.CONFIG.displayqronsitescreen === undefined ||
             !!CoreConstants.CONFIG.displayqronsitescreen);
     }
 
diff --git a/src/core/features/mainmenu/pages/home/home.ts b/src/core/features/mainmenu/pages/home/home.ts
index c7dfce575..a4d89d00e 100644
--- a/src/core/features/mainmenu/pages/home/home.ts
+++ b/src/core/features/mainmenu/pages/home/home.ts
@@ -109,7 +109,7 @@ export class CoreMainMenuHomePage implements OnInit {
         // Sort them by priority so new handlers are in the right position.
         newTabs.sort((a, b) => (handlersMap[b.title].priority || 0) - (handlersMap[a.title].priority || 0));
 
-        if (typeof this.selectedTab == 'undefined' && newTabs.length > 0) {
+        if (this.selectedTab === undefined && newTabs.length > 0) {
             let maxPriority = 0;
 
             this.selectedTab = Object.entries(newTabs).reduce((maxIndex, [index, tab]) => {
diff --git a/src/core/features/mainmenu/services/mainmenu.ts b/src/core/features/mainmenu/services/mainmenu.ts
index d34ecde37..f1c09fef0 100644
--- a/src/core/features/mainmenu/services/mainmenu.ts
+++ b/src/core/features/mainmenu/services/mainmenu.ts
@@ -176,7 +176,7 @@ export class CoreMainMenuProvider {
         }
 
         // Remove undefined values.
-        return result.filter((entry) => typeof entry != 'undefined');
+        return result.filter((entry) => entry !== undefined);
     }
 
     /**
diff --git a/src/core/features/pushnotifications/services/push-delegate.ts b/src/core/features/pushnotifications/services/push-delegate.ts
index 548301644..b897d0324 100644
--- a/src/core/features/pushnotifications/services/push-delegate.ts
+++ b/src/core/features/pushnotifications/services/push-delegate.ts
@@ -150,7 +150,7 @@ export class CorePushNotificationsDelegateService {
      * @return Observer to subscribe.
      */
     on<T = CorePushNotificationsNotificationBasicData>(eventName: string): Subject<T> {
-        if (typeof this.observables[eventName] == 'undefined') {
+        if (this.observables[eventName] === undefined) {
             const eventNames = Object.keys(this.observables).join(', ');
             this.logger.warn(`'${eventName}' event name is not allowed. Use one of the following: '${eventNames}'.`);
 
@@ -167,7 +167,7 @@ export class CorePushNotificationsDelegateService {
      * @return True if registered successfully, false otherwise.
      */
     registerClickHandler(handler: CorePushNotificationsClickHandler): boolean {
-        if (typeof this.clickHandlers[handler.name] !== 'undefined') {
+        if (this.clickHandlers[handler.name] !== undefined) {
             this.logger.log(`Addon '${handler.name}' already registered`);
 
             return false;
@@ -186,7 +186,7 @@ export class CorePushNotificationsDelegateService {
      * @param name Handler's name.
      */
     registerCounterHandler(name: string): void {
-        if (typeof this.counterHandlers[name] == 'undefined') {
+        if (this.counterHandlers[name] === undefined) {
             this.logger.debug(`Registered handler '${name}' as badge counter handler.`);
             this.counterHandlers[name] = name;
         } else {
@@ -201,7 +201,7 @@ export class CorePushNotificationsDelegateService {
      * @return If handler name is present.
      */
     isCounterHandlerRegistered(name: string): boolean {
-        return typeof this.counterHandlers[name] != 'undefined';
+        return this.counterHandlers[name] !== undefined;
     }
 
     /**
diff --git a/src/core/features/question/classes/base-question-component.ts b/src/core/features/question/classes/base-question-component.ts
index 630142130..7753c9d86 100644
--- a/src/core/features/question/classes/base-question-component.ts
+++ b/src/core/features/question/classes/base-question-component.ts
@@ -164,7 +164,7 @@ export class CoreQuestionBaseComponent {
         for (const i in options) {
             const optionEl = options[i];
 
-            if (typeof optionEl.value == 'undefined') {
+            if (optionEl.value === undefined) {
                 this.logger.warn('Aborting because couldn\'t find input.', this.question?.slot);
                 CoreQuestionHelper.showComponentError(this.onAbort);
 
@@ -225,7 +225,7 @@ export class CoreQuestionBaseComponent {
 
         // Extract question text.
         this.question.text = CoreDomUtils.getContentsOfElement(element, '.qtext');
-        if (typeof this.question.text == 'undefined') {
+        if (this.question.text === undefined) {
             this.logger.warn('Aborting because of an error parsing question.', this.question.slot);
 
             return CoreQuestionHelper.showComponentError(this.onAbort);
@@ -554,7 +554,7 @@ export class CoreQuestionBaseComponent {
             for (const j in options) {
                 const optionEl = options[j];
 
-                if (typeof optionEl.value == 'undefined') {
+                if (optionEl.value === undefined) {
                     this.logger.warn('Aborting because couldn\'t find the value of an option.', question.slot);
 
                     return CoreQuestionHelper.showComponentError(this.onAbort);
diff --git a/src/core/features/question/services/question-helper.ts b/src/core/features/question/services/question-helper.ts
index 6aacaca8a..b8ab02ad4 100644
--- a/src/core/features/question/services/question-helper.ts
+++ b/src/core/features/question/services/question-helper.ts
@@ -153,7 +153,7 @@ export class CoreQuestionHelperProvider {
         });
 
         // If we have a certainty value stored in local we'll use that one.
-        if (question.localAnswers && typeof question.localAnswers['-certainty'] != 'undefined') {
+        if (question.localAnswers && question.localAnswers['-certainty'] !== undefined) {
             question.behaviourCertaintySelected = question.localAnswers['-certainty'];
         }
 
diff --git a/src/core/features/rating/components/rate/rate.ts b/src/core/features/rating/components/rate/rate.ts
index 55f489c7f..cf2c43639 100644
--- a/src/core/features/rating/components/rate/rate.ts
+++ b/src/core/features/rating/components/rate/rate.ts
@@ -142,7 +142,7 @@ export class CoreRatingRateComponent implements OnChanges, OnDestroy {
                 this.aggregateMethod,
             );
 
-            if (typeof response == 'undefined') {
+            if (response === undefined) {
                 CoreDomUtils.showToast('core.datastoredoffline', true, 3000);
             } else {
                 this.onUpdate.emit();
diff --git a/src/core/features/settings/services/settings-helper.ts b/src/core/features/settings/services/settings-helper.ts
index 51e7a9c1f..3ca96984a 100644
--- a/src/core/features/settings/services/settings-helper.ts
+++ b/src/core/features/settings/services/settings-helper.ts
@@ -290,7 +290,7 @@ export class CoreSettingsHelperProvider {
         // Check old setting and update the new.
         try {
             const fontSize = await CoreConfig.get<number>('CoreSettingsFontSize');
-            if (typeof fontSize == 'undefined') {
+            if (fontSize === undefined) {
                 // Already upgraded.
                 return;
             }
diff --git a/src/core/features/siteplugins/classes/call-ws-click-directive.ts b/src/core/features/siteplugins/classes/call-ws-click-directive.ts
index 4e822ba1c..94c8b28f6 100644
--- a/src/core/features/siteplugins/classes/call-ws-click-directive.ts
+++ b/src/core/features/siteplugins/classes/call-ws-click-directive.ts
@@ -48,7 +48,7 @@ export class CoreSitePluginsCallWSOnClickBaseDirective extends CoreSitePluginsCa
             ev.preventDefault();
             ev.stopPropagation();
 
-            if (typeof this.confirmMessage != 'undefined') {
+            if (this.confirmMessage !== undefined) {
                 // Ask for confirm.
                 try {
                     await CoreDomUtils.showConfirm(this.confirmMessage || Translate.instant('core.areyousure'));
@@ -71,7 +71,7 @@ export class CoreSitePluginsCallWSOnClickBaseDirective extends CoreSitePluginsCa
         try {
             await super.callWS();
         } catch (error) {
-            if (typeof this.showError == 'undefined' || CoreUtils.isTrueOrOne(this.showError)) {
+            if (this.showError === undefined || CoreUtils.isTrueOrOne(this.showError)) {
                 CoreDomUtils.showErrorModalDefault(error, 'core.serverconnection', true);
             }
         } finally {
diff --git a/src/core/features/siteplugins/classes/handlers/module-handler.ts b/src/core/features/siteplugins/classes/handlers/module-handler.ts
index 847d2894b..9a945b48a 100644
--- a/src/core/features/siteplugins/classes/handlers/module-handler.ts
+++ b/src/core/features/siteplugins/classes/handlers/module-handler.ts
@@ -87,7 +87,7 @@ export class CoreSitePluginsModuleHandler extends CoreSitePluginsBaseHandler imp
             title: module.name,
             icon: this.getIconSrc(),
             class: this.handlerSchema.displaydata?.class,
-            showDownloadButton: typeof showDowloadButton != 'undefined' ? showDowloadButton : hasOffline,
+            showDownloadButton: showDowloadButton !== undefined ? showDowloadButton : hasOffline,
         };
 
         if (this.handlerSchema.method) {
diff --git a/src/core/features/siteplugins/directives/call-ws.ts b/src/core/features/siteplugins/directives/call-ws.ts
index e2b2226a4..6c232973e 100644
--- a/src/core/features/siteplugins/directives/call-ws.ts
+++ b/src/core/features/siteplugins/directives/call-ws.ts
@@ -72,7 +72,7 @@ export class CoreSitePluginsCallWSDirective extends CoreSitePluginsCallWSOnClick
             this.parentContent.refreshContent(true);
         }
 
-        if (typeof this.successMessage != 'undefined') {
+        if (this.successMessage !== undefined) {
             // Display the success message.
             CoreDomUtils.showToast(this.successMessage || Translate.instant('core.success'));
         }
diff --git a/src/core/features/siteplugins/services/siteplugins.ts b/src/core/features/siteplugins/services/siteplugins.ts
index c03ffbe91..70e85ea13 100644
--- a/src/core/features/siteplugins/services/siteplugins.ts
+++ b/src/core/features/siteplugins/services/siteplugins.ts
@@ -403,7 +403,7 @@ export class CoreSitePluginsProvider {
             return false;
         }
 
-        if (restrictEnrolled || typeof restrictEnrolled == 'undefined') {
+        if (restrictEnrolled || restrictEnrolled === undefined) {
             // Only enabled for courses the user is enrolled to. Check if the user is enrolled in the course.
             try {
                 await CoreCourses.getUserCourse(courseId, true);
@@ -485,7 +485,7 @@ export class CoreSitePluginsProvider {
 
         otherData = otherData || {};
 
-        if (typeof useOtherData == 'undefined') {
+        if (useOtherData === undefined) {
             // No need to add other data, return args as they are.
             return args;
         } else if (Array.isArray(useOtherData)) {
@@ -560,12 +560,12 @@ export class CoreSitePluginsProvider {
                     for (const i in paramsList) {
                         const paramName = paramsList[i];
 
-                        if (typeof args[paramName] != 'undefined') {
+                        if (args[paramName] !== undefined) {
                             params[paramName] = args[paramName];
                         } else {
                             // The param is not one of the default ones. Try to calculate the param to use.
                             const value = this.getDownloadParam(component, paramName, courseId, module);
-                            if (typeof value != 'undefined') {
+                            if (value !== undefined) {
                                 params[paramName] = value;
                             }
                         }
diff --git a/src/core/features/user/services/handlers/course-option.ts b/src/core/features/user/services/handlers/course-option.ts
index 8d0484c9e..37de80356 100644
--- a/src/core/features/user/services/handlers/course-option.ts
+++ b/src/core/features/user/services/handlers/course-option.ts
@@ -42,7 +42,7 @@ export class CoreUserCourseOptionHandlerService implements CoreCourseOptionsHand
      * @return Promise resolved when done.
      */
     invalidateEnabledForCourse(courseId: number, navOptions?: CoreCourseUserAdminOrNavOptionIndexed): Promise<void> {
-        if (navOptions && typeof navOptions.participants != 'undefined') {
+        if (navOptions && navOptions.participants !== undefined) {
             // No need to invalidate anything.
             return Promise.resolve();
         }
@@ -76,7 +76,7 @@ export class CoreUserCourseOptionHandlerService implements CoreCourseOptionsHand
             return false; // Not enabled for guests.
         }
 
-        if (navOptions && typeof navOptions.participants != 'undefined') {
+        if (navOptions && navOptions.participants !== undefined) {
             return navOptions.participants;
         }
 
diff --git a/src/core/features/user/services/user-delegate.ts b/src/core/features/user/services/user-delegate.ts
index df503bc7d..6adebcf06 100644
--- a/src/core/features/user/services/user-delegate.ts
+++ b/src/core/features/user/services/user-delegate.ts
@@ -367,14 +367,14 @@ export class CoreUserDelegateService extends CoreDelegate<CoreUserProfileHandler
             return handler.isEnabledForUser(user, courseId);
         }
 
-        if (typeof this.enabledForUserCache[handler.name] == 'undefined') {
+        if (this.enabledForUserCache[handler.name] === undefined) {
             this.enabledForUserCache[handler.name] = {};
         }
 
         const cacheKey = this.getCacheKey(courseId, user.id);
         const cache = this.enabledForUserCache[handler.name][cacheKey];
 
-        if (typeof cache != 'undefined') {
+        if (cache !== undefined) {
             return cache;
         }
 
diff --git a/src/core/features/user/services/user-offline.ts b/src/core/features/user/services/user-offline.ts
index 4fd5f1c6a..1eafad1c1 100644
--- a/src/core/features/user/services/user-offline.ts
+++ b/src/core/features/user/services/user-offline.ts
@@ -61,7 +61,7 @@ export class CoreUserOfflineProvider {
     async setPreference(name: string, value: string, onlineValue?: string, siteId?: string): Promise<void> {
         const site = await CoreSites.getSite(siteId);
 
-        if (typeof onlineValue == 'undefined') {
+        if (onlineValue === undefined) {
             const preference = await this.getPreference(name, site.id);
 
             onlineValue = preference.onlinevalue;
diff --git a/src/core/features/user/services/user-profile-field-delegate.ts b/src/core/features/user/services/user-profile-field-delegate.ts
index 93f893b5b..0432a8ea0 100644
--- a/src/core/features/user/services/user-profile-field-delegate.ts
+++ b/src/core/features/user/services/user-profile-field-delegate.ts
@@ -140,7 +140,7 @@ export class CoreUserProfileFieldDelegateService extends CoreDelegate<CoreUserPr
 
             if (handler.getData) {
                 return await handler.getData(field, signup, registerAuth, formValues);
-            } else if (field.shortname && typeof formValues[name] != 'undefined') {
+            } else if (field.shortname && formValues[name] !== undefined) {
                 // Handler doesn't implement the function, but the form has data for the field.
                 return {
                     type: type,
diff --git a/src/core/features/user/services/user.ts b/src/core/features/user/services/user.ts
index 23cf37c5b..15e2236ad 100644
--- a/src/core/features/user/services/user.ts
+++ b/src/core/features/user/services/user.ts
@@ -820,7 +820,7 @@ export class CoreUserProvider {
             responseExpected: false,
         };
 
-        if (typeof disableNotifications != 'undefined') {
+        if (disableNotifications !== undefined) {
             params.emailstop = disableNotifications ? 1 : 0;
         }
 
diff --git a/src/core/initializers/index.ts b/src/core/initializers/index.ts
index f9f60ea14..56c30b171 100644
--- a/src/core/initializers/index.ts
+++ b/src/core/initializers/index.ts
@@ -20,7 +20,7 @@ export function getInitializerProviders(): Provider[] {
     return context.keys().reduce((providers, fileName) => {
         const name = (fileName.match(/^(?:\.\/)?(.+)\.ts$/) || [])[1];
 
-        if (typeof name !== 'undefined' && name !== 'index') {
+        if (name !== undefined && name !== 'index') {
             providers.push({
                 provide: APP_INITIALIZER,
                 useValue: context(fileName).default,
diff --git a/src/core/pipes/format-date.ts b/src/core/pipes/format-date.ts
index 960ec19c0..2e49d275a 100644
--- a/src/core/pipes/format-date.ts
+++ b/src/core/pipes/format-date.ts
@@ -59,7 +59,7 @@ export class CoreFormatDatePipe implements PipeTransform {
             format = 'core.' + format;
         }
 
-        if (typeof convert == 'undefined') {
+        if (convert === undefined) {
             // Initialize convert param. Set it to false if it's a core.df format, set it to true otherwise.
             convert = format.indexOf('core.df') != 0;
         }
diff --git a/src/core/services/config.ts b/src/core/services/config.ts
index 37c65708e..70d6982ef 100644
--- a/src/core/services/config.ts
+++ b/src/core/services/config.ts
@@ -73,7 +73,7 @@ export class CoreConfigProvider {
 
             return entry.value;
         } catch (error) {
-            if (typeof defaultValue != 'undefined') {
+            if (defaultValue !== undefined) {
                 return defaultValue;
             }
 
diff --git a/src/core/services/cron.ts b/src/core/services/cron.ts
index 76a043947..a5b82dfa3 100644
--- a/src/core/services/cron.ts
+++ b/src/core/services/cron.ts
@@ -337,7 +337,7 @@ export class CoreCronDelegateService {
             // Invalid handler.
             return;
         }
-        if (typeof this.handlers[handler.name] != 'undefined') {
+        if (this.handlers[handler.name] !== undefined) {
             this.logger.debug(`The cron handler '${handler.name}' is already registered.`);
 
             return;
diff --git a/src/core/services/db.ts b/src/core/services/db.ts
index 1d1b2efea..a715625c8 100644
--- a/src/core/services/db.ts
+++ b/src/core/services/db.ts
@@ -36,7 +36,7 @@ export class CoreDbProvider {
      * @return DB.
      */
     getDB(name: string, forceNew?: boolean): SQLiteDB {
-        if (typeof this.dbInstances[name] === 'undefined' || forceNew) {
+        if (this.dbInstances[name] === undefined || forceNew) {
             if (Platform.is('cordova')) {
                 this.dbInstances[name] = new SQLiteDB(name);
             } else {
@@ -54,7 +54,7 @@ export class CoreDbProvider {
      * @return Promise resolved when the DB is deleted.
      */
     async deleteDB(name: string): Promise<void> {
-        if (typeof this.dbInstances[name] != 'undefined') {
+        if (this.dbInstances[name] !== undefined) {
             // Close the database first.
             await this.dbInstances[name].close();
 
diff --git a/src/core/services/file-helper.ts b/src/core/services/file-helper.ts
index 17b5f0d21..136d1291e 100644
--- a/src/core/services/file-helper.ts
+++ b/src/core/services/file-helper.ts
@@ -449,7 +449,7 @@ export class CoreFileHelperProvider {
     getFilenameFromPath(file: CoreFileEntry): string | undefined {
         const path = CoreUtils.isFileEntry(file) ? file.fullPath : file.filepath;
 
-        if (typeof path == 'undefined' || path.length == 0) {
+        if (path === undefined || path.length == 0) {
             return;
         }
 
diff --git a/src/core/services/file.ts b/src/core/services/file.ts
index 2316855b8..698cdac02 100644
--- a/src/core/services/file.ts
+++ b/src/core/services/file.ts
@@ -157,7 +157,7 @@ export class CoreFileProvider {
      * @return Whether the plugin is available.
      */
     isAvailable(): boolean {
-        return typeof window.resolveLocalFileSystemURL !== 'undefined';
+        return window.resolveLocalFileSystemURL !== undefined;
     }
 
     /**
@@ -982,7 +982,7 @@ export class CoreFileProvider {
     async replaceInFile(path: string, search: string | RegExp, newValue: string): Promise<void> {
         let content = <string> await this.readFile(path);
 
-        if (typeof content == 'undefined' || content === null || !content.replace) {
+        if (content === undefined || content === null || !content.replace) {
             throw new CoreError(`Error reading file ${path}`);
         }
 
@@ -1139,7 +1139,7 @@ export class CoreFileProvider {
      * @return Unique name.
      */
     calculateUniqueName(usedNames: Record<string, unknown>, name: string): string {
-        if (typeof usedNames[name.toLowerCase()] == 'undefined') {
+        if (usedNames[name.toLowerCase()] === undefined) {
             // No file with the same name.
             return name;
         }
@@ -1153,7 +1153,7 @@ export class CoreFileProvider {
         do {
             name = nameWithoutExtension + '(' + num + ')' + extension;
             num++;
-        } while (typeof usedNames[name.toLowerCase()] != 'undefined');
+        } while (usedNames[name.toLowerCase()] !== undefined);
 
         return name;
     }
diff --git a/src/core/services/filepool.ts b/src/core/services/filepool.ts
index 98efbef5f..d0c00aece 100644
--- a/src/core/services/filepool.ts
+++ b/src/core/services/filepool.ts
@@ -466,7 +466,7 @@ export class CoreFilepoolProvider {
 
         let size: number;
 
-        if (typeof this.sizeCache[fileUrl] != 'undefined') {
+        if (this.sizeCache[fileUrl] !== undefined) {
             size = this.sizeCache[fileUrl];
         } else {
             if (!CoreApp.isOnline()) {
@@ -594,7 +594,7 @@ export class CoreFilepoolProvider {
      * @return Link, null if nothing to link.
      */
     protected createComponentLink(component?: string, componentId?: string | number): CoreFilepoolComponentLink | undefined {
-        if (typeof component != 'undefined' && component != null) {
+        if (component !== undefined && component != null) {
             return { component, componentId: this.fixComponentId(componentId) };
         }
     }
@@ -681,7 +681,7 @@ export class CoreFilepoolProvider {
         }
 
         const extension = CoreMimetypeUtils.guessExtensionFromUrl(fileUrl);
-        const addExtension = typeof filePath == 'undefined';
+        const addExtension = filePath === undefined;
         const path = filePath || (await this.getFilePath(siteId, fileId, extension));
 
         if (poolFileObject && poolFileObject.fileId !== fileId) {
@@ -994,7 +994,7 @@ export class CoreFilepoolProvider {
         const links = this.createComponentLinks(component, componentId);
 
         const finishSuccessfulDownload = (url: string): string => {
-            if (typeof component != 'undefined') {
+            if (component !== undefined) {
                 CoreUtils.ignoreErrors(this.addFileLink(siteId, fileId, component, componentId));
             }
 
@@ -1104,7 +1104,7 @@ export class CoreFilepoolProvider {
      * @return Promise resolved when done.
      */
     protected async fillExtensionInFile(entry: CoreFilepoolFileEntry, siteId: string): Promise<void> {
-        if (typeof entry.extension != 'undefined') {
+        if (entry.extension !== undefined) {
             // Already filled.
             return;
         }
@@ -1149,7 +1149,7 @@ export class CoreFilepoolProvider {
             return componentId;
         }
 
-        if (typeof componentId == 'undefined' || componentId === null) {
+        if (componentId === undefined || componentId === null) {
             return -1;
         }
 
@@ -1335,7 +1335,7 @@ export class CoreFilepoolProvider {
     protected async getFilePath(siteId: string, fileId: string, extension?: string): Promise<string> {
         let path = this.getFilepoolFolderPath(siteId) + '/' + fileId;
 
-        if (typeof extension == 'undefined') {
+        if (extension === undefined) {
             // We need the extension to be able to open files properly.
             try {
                 const entry = await this.hasFileInPool(siteId, fileId);
@@ -1555,7 +1555,7 @@ export class CoreFilepoolProvider {
         try {
             const entry = await this.hasFileInPool(siteId, fileId);
 
-            if (typeof entry === 'undefined') {
+            if (entry === undefined) {
                 throw new CoreError('File not downloaded.');
             }
 
@@ -1949,7 +1949,7 @@ export class CoreFilepoolProvider {
         }
 
         const matches = url.match(revisionRegex);
-        if (matches && typeof matches[1] != 'undefined') {
+        if (matches && matches[1] !== undefined) {
             return parseInt(matches[1], 10);
         }
 
@@ -2131,7 +2131,7 @@ export class CoreFilepoolProvider {
         const db = await CoreSites.getSiteDb(siteId);
         const entry = await db.getRecord<CoreFilepoolFileEntry>(FILES_TABLE_NAME, { fileId });
 
-        if (typeof entry === 'undefined') {
+        if (entry === undefined) {
             throw new CoreError('File not found in filepool.');
         }
 
@@ -2149,7 +2149,7 @@ export class CoreFilepoolProvider {
         const db = await this.appDB;
         const entry = await db.getRecord<CoreFilepoolQueueEntry>(QUEUE_TABLE_NAME, { siteId, fileId });
 
-        if (typeof entry === 'undefined') {
+        if (entry === undefined) {
             throw new CoreError('File not found in queue.');
         }
         // Convert the links to an object.
@@ -2872,7 +2872,7 @@ export class CoreFilepoolProvider {
             const entry = await site.getDb().getRecord<CoreFilepoolPackageEntry>(PACKAGES_TABLE_NAME, { id: packageId });
 
             extra = extra ?? entry.extra;
-            if (typeof downloadTime == 'undefined') {
+            if (downloadTime === undefined) {
                 // Keep previous download time.
                 downloadTime = entry.downloadTime;
                 previousDownloadTime = entry.previousDownloadTime;
diff --git a/src/core/services/groups.ts b/src/core/services/groups.ts
index b0d63b803..39320f09a 100644
--- a/src/core/services/groups.ts
+++ b/src/core/services/groups.ts
@@ -214,7 +214,7 @@ export class CoreGroupsProvider {
         const response: CoreGroupGetActivityGroupModeWSResponse =
             await site.read('core_group_get_activity_groupmode', params, preSets);
 
-        if (!response || typeof response.groupmode == 'undefined') {
+        if (!response || response.groupmode === undefined) {
             throw new CoreError('Activity group mode not found.');
         }
 
diff --git a/src/core/services/lang.ts b/src/core/services/lang.ts
index f0430b64f..e8c09518c 100644
--- a/src/core/services/lang.ts
+++ b/src/core/services/lang.ts
@@ -223,7 +223,7 @@ export class CoreLangProvider {
      * @return Promise resolved with the current language.
      */
     async getCurrentLanguage(): Promise<string> {
-        if (typeof this.currentLanguage != 'undefined') {
+        if (this.currentLanguage !== undefined) {
             return this.currentLanguage;
         }
 
@@ -254,13 +254,13 @@ export class CoreLangProvider {
         let preferredLanguage = navigator.language.toLowerCase();
         if (preferredLanguage.indexOf('-') > -1) {
             // Language code defined by locale has a dash, like en-US or es-ES. Check if it's supported.
-            if (CoreConstants.CONFIG.languages && typeof CoreConstants.CONFIG.languages[preferredLanguage] == 'undefined') {
+            if (CoreConstants.CONFIG.languages && CoreConstants.CONFIG.languages[preferredLanguage] === undefined) {
                 // Code is NOT supported. Fallback to language without dash. E.g. 'en-US' would fallback to 'en'.
                 preferredLanguage = preferredLanguage.substr(0, preferredLanguage.indexOf('-'));
             }
         }
 
-        if (typeof CoreConstants.CONFIG.languages[preferredLanguage] == 'undefined') {
+        if (CoreConstants.CONFIG.languages[preferredLanguage] === undefined) {
             // Language not supported, use default language.
             return this.defaultLanguage;
         }
@@ -349,7 +349,7 @@ export class CoreLangProvider {
     loadCustomStringsFromSite(currentSite: CoreSite): void {
         const customStrings = currentSite.getStoredConfig('tool_mobile_customlangstrings');
 
-        if (typeof customStrings != 'undefined') {
+        if (customStrings !== undefined) {
             this.loadCustomStrings(customStrings);
         }
     }
diff --git a/src/core/services/local-notifications.ts b/src/core/services/local-notifications.ts
index 9b69435e0..f486e79e9 100644
--- a/src/core/services/local-notifications.ts
+++ b/src/core/services/local-notifications.ts
@@ -227,7 +227,7 @@ export class CoreLocalNotificationsProvider {
         const key = table + '#' + id;
 
         // Check if the code is already in memory.
-        if (typeof this.codes[key] != 'undefined') {
+        if (this.codes[key] !== undefined) {
             return this.codes[key];
         }
 
@@ -413,7 +413,7 @@ export class CoreLocalNotificationsProvider {
     protected async processNextRequest(): Promise<void> {
         const nextKey = Object.keys(this.codeRequestsQueue)[0];
 
-        if (typeof nextKey == 'undefined') {
+        if (nextKey === undefined) {
             // No more requests in queue, stop.
             return;
         }
@@ -469,11 +469,11 @@ export class CoreLocalNotificationsProvider {
     ): CoreEventObserver {
         this.logger.debug(`Register observer '${component}' for event '${eventName}'.`);
 
-        if (typeof this.observables[eventName] == 'undefined') {
+        if (this.observables[eventName] === undefined) {
             this.observables[eventName] = {};
         }
 
-        if (typeof this.observables[eventName][component] == 'undefined') {
+        if (this.observables[eventName][component] === undefined) {
             // No observable for this component, create a new one.
             this.observables[eventName][component] = new Subject<T>();
         }
@@ -511,7 +511,7 @@ export class CoreLocalNotificationsProvider {
         const key = table + '#' + id;
         const isQueueEmpty = Object.keys(this.codeRequestsQueue).length == 0;
 
-        if (typeof this.codeRequestsQueue[key] != 'undefined') {
+        if (this.codeRequestsQueue[key] !== undefined) {
             // There's already a pending request for this store and ID, add the promise to it.
             this.codeRequestsQueue[key].deferreds.push(deferred);
         } else {
diff --git a/src/core/services/plugin-file-delegate.ts b/src/core/services/plugin-file-delegate.ts
index 9c566fec0..ef78e78ae 100644
--- a/src/core/services/plugin-file-delegate.ts
+++ b/src/core/services/plugin-file-delegate.ts
@@ -167,7 +167,7 @@ export class CorePluginFileDelegateService extends CoreDelegate<CorePluginFileHa
         await Promise.all(files.map(async (file) => {
             const size = await this.getFileSize(file, siteId);
 
-            if (typeof size == 'undefined') {
+            if (size === undefined) {
                 // We don't have the file size, cannot calculate its total size.
                 result.total = false;
             } else {
diff --git a/src/core/services/sites.ts b/src/core/services/sites.ts
index 116f125dd..f90b14ace 100644
--- a/src/core/services/sites.ts
+++ b/src/core/services/sites.ts
@@ -121,7 +121,7 @@ export class CoreSitesProvider {
         const demoSites = CoreConstants.CONFIG.demo_sites;
         name = name.toLowerCase();
 
-        if (typeof demoSites != 'undefined' && typeof demoSites[name] != 'undefined') {
+        if (demoSites !== undefined && demoSites[name] !== undefined) {
             return demoSites[name];
         }
     }
@@ -364,13 +364,13 @@ export class CoreSitesProvider {
             throw new CoreError(Translate.instant('core.cannotconnecttrouble'));
         }
 
-        if (typeof data == 'undefined') {
+        if (data === undefined) {
             throw new CoreError(Translate.instant('core.cannotconnecttrouble'));
         } else {
-            if (typeof data.token != 'undefined') {
+            if (data.token !== undefined) {
                 return { token: data.token, siteUrl, privateToken: data.privatetoken };
             } else {
-                if (typeof data.error != 'undefined') {
+                if (data.error !== undefined) {
                     // We only allow one retry (to avoid loops).
                     if (!retry && data.errorcode == 'requirecorrectaccess') {
                         siteUrl = CoreUrlUtils.addOrRemoveWWW(siteUrl);
@@ -468,7 +468,7 @@ export class CoreSitesProvider {
                 }
             }
 
-            if (typeof config != 'undefined') {
+            if (config !== undefined) {
                 candidateSite.setConfig(config);
             }
 
@@ -891,7 +891,7 @@ export class CoreSitesProvider {
      * @return Whether the user is logged in a site.
      */
     isLoggedIn(): boolean {
-        return typeof this.currentSite != 'undefined' && typeof this.currentSite.token != 'undefined' &&
+        return this.currentSite !== undefined && this.currentSite.token !== undefined &&
             this.currentSite.token != '';
     }
 
@@ -904,7 +904,7 @@ export class CoreSitesProvider {
     async deleteSite(siteId: string): Promise<void> {
         this.logger.debug(`Delete site ${siteId}`);
 
-        if (typeof this.currentSite != 'undefined' && this.currentSite.id == siteId) {
+        if (this.currentSite !== undefined && this.currentSite.id == siteId) {
             this.logout();
         }
 
@@ -956,7 +956,7 @@ export class CoreSitesProvider {
             throw new CoreError('No current site found.');
         } else if (this.currentSite && this.currentSite.getId() == siteId) {
             return this.currentSite;
-        } else if (typeof this.sites[siteId] != 'undefined') {
+        } else if (this.sites[siteId] !== undefined) {
             return this.sites[siteId];
         } else {
             // Retrieve and create the site.
@@ -981,7 +981,7 @@ export class CoreSitesProvider {
         const db = await this.appDB;
         const data = await db.getRecord<SiteDBEntry>(SITES_TABLE_NAME, { siteUrl });
 
-        if (typeof this.sites[data.id] != 'undefined') {
+        if (this.sites[data.id] !== undefined) {
             return this.sites[data.id];
         }
 
@@ -1326,7 +1326,7 @@ export class CoreSitesProvider {
                 loggedOut: site.isLoggedOut() ? 1 : 0,
             };
 
-            if (typeof config != 'undefined') {
+            if (config !== undefined) {
                 site.setConfig(config);
                 newValues.config = JSON.stringify(config);
             }
diff --git a/src/core/services/utils/dom.ts b/src/core/services/utils/dom.ts
index 9b22c544e..945871287 100644
--- a/src/core/services/utils/dom.ts
+++ b/src/core/services/utils/dom.ts
@@ -200,8 +200,8 @@ export class CoreDomUtilsProvider {
 
         const availableSpace = getAvailableSpace(availableBytes);
 
-        wifiThreshold = typeof wifiThreshold == 'undefined' ? CoreConstants.WIFI_DOWNLOAD_THRESHOLD : wifiThreshold;
-        limitedThreshold = typeof limitedThreshold == 'undefined' ? CoreConstants.DOWNLOAD_THRESHOLD : limitedThreshold;
+        wifiThreshold = wifiThreshold === undefined ? CoreConstants.WIFI_DOWNLOAD_THRESHOLD : wifiThreshold;
+        limitedThreshold = limitedThreshold === undefined ? CoreConstants.DOWNLOAD_THRESHOLD : limitedThreshold;
 
         let wifiPrefix = '';
         if (CoreApp.isNetworkAccessLimited()) {
@@ -948,7 +948,7 @@ export class CoreDomUtilsProvider {
                 paths[CoreUrlUtils.removeUrlParams(CoreTextUtils.decodeURIComponent(currentSrc))] :
                 undefined;
 
-            if (typeof newSrc != 'undefined') {
+            if (newSrc !== undefined) {
                 media.setAttribute('src', newSrc);
             }
 
@@ -956,7 +956,7 @@ export class CoreDomUtilsProvider {
             if (media.tagName == 'VIDEO' && media.getAttribute('poster')) {
                 const currentPoster = media.getAttribute('poster');
                 const newPoster = paths[CoreTextUtils.decodeURIComponent(currentPoster!)];
-                if (typeof newPoster !== 'undefined') {
+                if (newPoster !== undefined) {
                     media.setAttribute('poster', newPoster);
                 }
             }
@@ -970,7 +970,7 @@ export class CoreDomUtilsProvider {
                 paths[CoreUrlUtils.removeUrlParams(CoreTextUtils.decodeURIComponent(currentHref))] :
                 undefined;
 
-            if (typeof newHref != 'undefined') {
+            if (newHref !== undefined) {
                 anchor.setAttribute('href', newHref);
 
                 if (typeof anchorFn == 'function') {
@@ -1226,7 +1226,7 @@ export class CoreDomUtilsProvider {
                 if (options.buttons) {
                     // Execute dismiss function if any.
                     const cancelButton = <AlertButton> options.buttons.find(
-                        (button) => typeof button != 'string' && typeof button.handler != 'undefined' && button.role == 'cancel',
+                        (button) => typeof button != 'string' && button.handler !== undefined && button.role == 'cancel',
                     );
                     cancelButton.handler?.(null);
                 }
diff --git a/src/core/services/utils/mimetype.ts b/src/core/services/utils/mimetype.ts
index ddf65901d..98ab537a6 100644
--- a/src/core/services/utils/mimetype.ts
+++ b/src/core/services/utils/mimetype.ts
@@ -325,7 +325,7 @@ export class CoreMimetypeUtilsProvider {
         }
 
         // Check extension corresponds to a mimetype to know if it's valid.
-        if (extension && typeof this.getMimeType(extension) == 'undefined') {
+        if (extension && this.getMimeType(extension) === undefined) {
             this.logger.warn('Guess file extension: Not valid extension ' + extension);
 
             return;
@@ -350,7 +350,7 @@ export class CoreMimetypeUtilsProvider {
             ext = this.cleanExtension(ext);
 
             // Check extension corresponds to a mimetype to know if it's valid.
-            if (typeof this.getMimeType(ext) == 'undefined') {
+            if (this.getMimeType(ext) === undefined) {
                 this.logger.warn('Get file extension: Not valid extension ' + ext);
 
                 return;
@@ -370,7 +370,7 @@ export class CoreMimetypeUtilsProvider {
     getGroupMimeInfo(group: string): MimeTypeGroupInfo;
     getGroupMimeInfo(group: string, field: string): string[] | undefined;
     getGroupMimeInfo(group: string, field?: string): MimeTypeGroupInfo | string[] | undefined {
-        if (typeof this.groupsMimeInfo[group] == 'undefined') {
+        if (this.groupsMimeInfo[group] === undefined) {
             this.fillGroupMimeInfo(group);
         }
 
@@ -590,7 +590,7 @@ export class CoreMimetypeUtilsProvider {
         if (position > -1) {
             // Check extension corresponds to a mimetype to know if it's valid.
             extension = path.substr(position + 1).toLowerCase();
-            if (typeof this.getMimeType(extension) != 'undefined') {
+            if (this.getMimeType(extension) !== undefined) {
                 return path.substr(0, position); // Remove extension.
             }
         }
diff --git a/src/core/services/utils/text.ts b/src/core/services/utils/text.ts
index 362298e18..c37c3f8a9 100644
--- a/src/core/services/utils/text.ts
+++ b/src/core/services/utils/text.ts
@@ -215,7 +215,7 @@ export class CoreTextUtilsProvider {
      * @return Size in human readable format.
      */
     bytesToSize(bytes: number, precision: number = 2): string {
-        if (typeof bytes == 'undefined' || bytes === null || bytes < 0) {
+        if (bytes === undefined || bytes === null || bytes < 0) {
             return Translate.instant('core.notapplicable');
         }
 
@@ -347,7 +347,7 @@ export class CoreTextUtilsProvider {
      * @return Decoded text.
      */
     decodeHTML(text: string | number): string {
-        if (typeof text == 'undefined' || text === null || (typeof text == 'number' && isNaN(text))) {
+        if (text === undefined || text === null || (typeof text == 'number' && isNaN(text))) {
             return '';
         } else if (typeof text != 'string') {
             return '' + text;
@@ -430,7 +430,7 @@ export class CoreTextUtilsProvider {
      * @return Escaped text.
      */
     escapeHTML(text?: string | number | null, doubleEncode: boolean = true): string {
-        if (typeof text == 'undefined' || text === null || (typeof text == 'number' && isNaN(text))) {
+        if (text === undefined || text === null || (typeof text == 'number' && isNaN(text))) {
             return '';
         } else if (typeof text != 'string') {
             return '' + text;
@@ -673,7 +673,7 @@ export class CoreTextUtilsProvider {
         }
 
         // Error parsing, return the default value or the original value.
-        if (typeof defaultValue != 'undefined') {
+        if (defaultValue !== undefined) {
             return defaultValue;
         }
 
diff --git a/src/core/services/utils/time.ts b/src/core/services/utils/time.ts
index 684c741b0..60457d388 100644
--- a/src/core/services/utils/time.ts
+++ b/src/core/services/utils/time.ts
@@ -97,7 +97,7 @@ export class CoreTimeUtilsProvider {
                     converted += ']';
                 }
 
-                converted += typeof CoreTimeUtilsProvider.FORMAT_REPLACEMENTS[char] != 'undefined' ?
+                converted += CoreTimeUtilsProvider.FORMAT_REPLACEMENTS[char] !== undefined ?
                     CoreTimeUtilsProvider.FORMAT_REPLACEMENTS[char] : char;
             } else {
                 // Not a PHP format. We need to escape them, otherwise the letters could be confused with Moment formats.
@@ -338,7 +338,7 @@ export class CoreTimeUtilsProvider {
     convertToTimestamp(date: string, applyOffset?: boolean): number {
         const timestamp = moment(date).unix();
 
-        if (typeof applyOffset !== 'undefined') {
+        if (applyOffset !== undefined) {
             return applyOffset ? timestamp - moment().utcOffset() * 60 : timestamp;
         }
 
diff --git a/src/core/services/utils/url.ts b/src/core/services/utils/url.ts
index 1fbf79211..15ed16dfc 100644
--- a/src/core/services/utils/url.ts
+++ b/src/core/services/utils/url.ts
@@ -146,7 +146,7 @@ export class CoreUrlUtilsProvider {
         }
 
         urlAndHash[0].replace(regex, (match: string, key: string, value: string): string => {
-            params[key] = typeof value != 'undefined' ? CoreTextUtils.decodeURIComponent(value) : '';
+            params[key] = value !== undefined ? CoreTextUtils.decodeURIComponent(value) : '';
 
             if (subParams) {
                 params[key] = params[key].replace(subParamsPlaceholder, subParams);
@@ -246,7 +246,7 @@ export class CoreUrlUtilsProvider {
     async getDocsUrl(release?: string, page: string = 'Mobile_app'): Promise<string> {
         let docsUrl = 'https://docs.moodle.org/en/' + page;
 
-        if (typeof release != 'undefined') {
+        if (release !== undefined) {
             const version = CoreSites.getMajorReleaseNumber(release).replace('.', '');
 
             // Check is a valid number.
diff --git a/src/core/services/utils/utils.ts b/src/core/services/utils/utils.ts
index 1ffe37ddf..e66e673fd 100644
--- a/src/core/services/utils/utils.ts
+++ b/src/core/services/utils/utils.ts
@@ -150,7 +150,7 @@ export class CoreUtilsProvider {
     ): Record<string, T[]> {
         for (const entry of array) {
             const key = propertyName ? entry[propertyName] : entry;
-            if (typeof result[key] == 'undefined') {
+            if (result[key] === undefined) {
                 result[key] = [];
             }
 
@@ -202,7 +202,7 @@ export class CoreUtilsProvider {
             return equal;
         } else {
             if (undefinedIsNull && (
-                (typeof itemA == 'undefined' && itemB === null) || (itemA === null && typeof itemB == 'undefined'))) {
+                (itemA === undefined && itemB === null) || (itemA === null && itemB === undefined))) {
                 return true;
             }
 
@@ -524,7 +524,7 @@ export class CoreUtilsProvider {
      * @return Locale float.
      */
     formatFloat(float: unknown): string {
-        if (typeof float == 'undefined' || float === null || typeof float == 'boolean') {
+        if (float === undefined || float === null || typeof float == 'boolean') {
             return '';
         }
 
@@ -836,7 +836,7 @@ export class CoreUtilsProvider {
      */
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     isFalseOrZero(value: any): boolean {
-        return typeof value != 'undefined' && (value === false || value === 'false' || parseInt(value, 10) === 0);
+        return value !== undefined && (value === false || value === 'false' || parseInt(value, 10) === 0);
     }
 
     /**
@@ -847,7 +847,7 @@ export class CoreUtilsProvider {
      */
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     isTrueOrOne(value: any): boolean {
-        return typeof value != 'undefined' && (value === true || value === 'true' || parseInt(value, 10) === 1);
+        return value !== undefined && (value === true || value === 'true' || parseInt(value, 10) === 1);
     }
 
     /**
@@ -858,7 +858,7 @@ export class CoreUtilsProvider {
      */
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     isWebServiceError(error: any): boolean {
-        return error && (typeof error.warningcode != 'undefined' || (typeof error.errorcode != 'undefined' &&
+        return error && (error.warningcode !== undefined || (error.errorcode !== undefined &&
                 error.errorcode != 'userdeleted' && error.errorcode != 'upgraderunning' &&
                 error.errorcode != 'forcepasswordchangenotice' && error.errorcode != 'usernotfullysetup' &&
                 error.errorcode != 'sitepolicynotagreed' && error.errorcode != 'sitemaintenance' &&
@@ -929,7 +929,7 @@ export class CoreUtilsProvider {
      */
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     notNullOrUndefined(value: any): boolean {
-        return typeof value != 'undefined' && value !== null;
+        return value !== undefined && value !== null;
     }
 
     /**
@@ -1183,7 +1183,7 @@ export class CoreUtilsProvider {
     ): A[] {
         // Get the entries from an object or primitive value.
         const getEntries = (elKey: string, value: unknown): Record<string, unknown>[] | unknown => {
-            if (typeof value == 'undefined' || value == null) {
+            if (value === undefined || value == null) {
                 // Filter undefined and null values.
                 return;
             } else if (this.isObject(value)) {
@@ -1277,7 +1277,7 @@ export class CoreUtilsProvider {
         for (const name in flattened) {
             let value = flattened[name];
 
-            if (removeEmpty && (value === null || typeof value == 'undefined')) {
+            if (removeEmpty && (value === null || value === undefined)) {
                 continue;
             }
 
@@ -1379,8 +1379,8 @@ export class CoreUtilsProvider {
         obj2: Record<string, unknown> | unknown[],
         key: string,
     ): boolean {
-        let value1 = typeof obj1[key] != 'undefined' ? obj1[key] : '';
-        let value2 = typeof obj2[key] != 'undefined' ? obj2[key] : '';
+        let value1 = obj1[key] !== undefined ? obj1[key] : '';
+        let value2 = obj2[key] !== undefined ? obj2[key] : '';
 
         if (typeof value1 == 'number' || typeof value1 == 'boolean') {
             value1 = '' + value1;
@@ -1484,7 +1484,7 @@ export class CoreUtilsProvider {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     unformatFloat(localeFloat: any, strict?: boolean): false | '' | number {
         // Bad format on input type number.
-        if (typeof localeFloat == 'undefined') {
+        if (localeFloat === undefined) {
             return false;
         }
 
@@ -1656,7 +1656,7 @@ export class CoreUtilsProvider {
 
         if (error) {
             this.qrScanData.deferred.reject(data);
-        } else if (typeof data != 'undefined') {
+        } else if (data !== undefined) {
             this.qrScanData.deferred.resolve(data as string);
         } else {
             this.qrScanData.deferred.reject(new CoreCanceledError());
diff --git a/src/core/services/ws.ts b/src/core/services/ws.ts
index ff2d7e869..d1ab15a5e 100644
--- a/src/core/services/ws.ts
+++ b/src/core/services/ws.ts
@@ -100,7 +100,7 @@ export class CoreWSProvider {
         }
 
         preSets.typeExpected = preSets.typeExpected || 'object';
-        if (typeof preSets.responseExpected == 'undefined') {
+        if (preSets.responseExpected === undefined) {
             preSets.responseExpected = true;
         }
 
@@ -323,7 +323,7 @@ export class CoreWSProvider {
      */
     protected getPromiseHttp<T = unknown>(method: string, url: string, params?: Record<string, unknown>): Promise<T> | undefined {
         const queueItemId = this.getQueueItemId(method, url, params);
-        if (typeof this.ongoingCalls[queueItemId] != 'undefined') {
+        if (this.ongoingCalls[queueItemId] !== undefined) {
             return this.ongoingCalls[queueItemId];
         }
     }
@@ -414,13 +414,13 @@ export class CoreWSProvider {
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
         let promise: Promise<HttpResponse<any>>;
 
-        if (typeof preSets.siteUrl == 'undefined') {
+        if (preSets.siteUrl === undefined) {
             throw new CoreAjaxError(Translate.instant('core.unexpectederror'));
         } else if (!CoreApp.isOnline()) {
             throw new CoreAjaxError(Translate.instant('core.networkerrormsg'));
         }
 
-        if (typeof preSets.responseExpected == 'undefined') {
+        if (preSets.responseExpected === undefined) {
             preSets.responseExpected = true;
         }
 
@@ -655,7 +655,7 @@ export class CoreWSProvider {
                 }
             }
 
-            if (typeof data.exception !== 'undefined') {
+            if (data.exception !== undefined) {
                 // Special debugging for site plugins, otherwise it's hard to debug errors if the data is cached.
                 if (method == 'tool_mobile_get_content') {
                     this.logger.error('Error calling WS', method, data);
@@ -664,7 +664,7 @@ export class CoreWSProvider {
                 throw new CoreWSError(data);
             }
 
-            if (typeof data.debuginfo != 'undefined') {
+            if (data.debuginfo !== undefined) {
                 throw new CoreError('Error. ' + data.message);
             }
 
@@ -787,7 +787,7 @@ export class CoreWSProvider {
         }
 
         preSets.typeExpected = preSets.typeExpected || 'object';
-        if (typeof preSets.responseExpected == 'undefined') {
+        if (preSets.responseExpected === undefined) {
             preSets.responseExpected = true;
         }
 
@@ -838,7 +838,7 @@ export class CoreWSProvider {
             throw new CoreError(Translate.instant('core.errorinvalidresponse'));
         }
 
-        if (typeof data.exception != 'undefined' || typeof data.debuginfo != 'undefined') {
+        if (data.exception !== undefined || data.debuginfo !== undefined) {
             throw new CoreWSError(data);
         }
 
@@ -907,14 +907,14 @@ export class CoreWSProvider {
                 throw new CoreError(Translate.instant('core.errorinvalidresponse'));
             }
 
-            if (typeof data.exception !== 'undefined') {
+            if (data.exception !== undefined) {
                 throw new CoreWSError(data);
-            } else if (typeof data.error !== 'undefined') {
+            } else if (data.error !== undefined) {
                 throw new CoreWSError({
                     errorcode: data.errortype,
                     message: data.error,
                 });
-            } else if (data[0] && typeof data[0].error !== 'undefined') {
+            } else if (data[0] && data[0].error !== undefined) {
                 throw new CoreWSError({
                     errorcode: data[0].errortype,
                     message: data[0].error,
@@ -966,7 +966,7 @@ export class CoreWSProvider {
     async sendHTTPRequest<T = unknown>(url: string, options: HttpRequestOptions): Promise<HttpResponse<T>> {
         // Set default values.
         options.responseType = options.responseType || 'json';
-        options.timeout = typeof options.timeout == 'undefined' ? this.getRequestTimeout() : options.timeout;
+        options.timeout = options.timeout === undefined ? this.getRequestTimeout() : options.timeout;
 
         if (CoreApp.isMobile()) {
             // Use the cordova plugin.
diff --git a/src/core/singletons/events.ts b/src/core/singletons/events.ts
index a88ea0722..ecc3a9ad8 100644
--- a/src/core/singletons/events.ts
+++ b/src/core/singletons/events.ts
@@ -137,7 +137,7 @@ export class CoreEvents {
 
         this.logger.debug(`New observer listening to event '${eventName}'`);
 
-        if (typeof this.observables[eventName] == 'undefined') {
+        if (this.observables[eventName] === undefined) {
             // No observable for this event, create a new one.
             this.observables[eventName] = new Subject();
         }