diff --git a/src/addons/mod/assign/components/components.module.ts b/src/addons/mod/assign/components/components.module.ts
index 233a7c3aa..d215e9d79 100644
--- a/src/addons/mod/assign/components/components.module.ts
+++ b/src/addons/mod/assign/components/components.module.ts
@@ -13,10 +13,6 @@
 // limitations under the License.
 
 import { NgModule } from '@angular/core';
-import { CommonModule } from '@angular/common';
-import { FormsModule } from '@angular/forms';
-import { IonicModule } from '@ionic/angular';
-import { TranslateModule } from '@ngx-translate/core';
 
 import { CoreSharedModule } from '@/core/shared.module';
 import { CoreCourseComponentsModule } from '@features/course/components/components.module';
@@ -35,10 +31,6 @@ import { AddonModAssignEditFeedbackModalComponent } from './edit-feedback-modal/
         AddonModAssignEditFeedbackModalComponent,
     ],
     imports: [
-        CommonModule,
-        IonicModule,
-        TranslateModule.forChild(),
-        FormsModule,
         CoreSharedModule,
         CoreCourseComponentsModule,
     ],
diff --git a/src/addons/mod/assign/components/feedback-plugin/feedback-plugin.ts b/src/addons/mod/assign/components/feedback-plugin/feedback-plugin.ts
index 96f5be1ab..650074442 100644
--- a/src/addons/mod/assign/components/feedback-plugin/feedback-plugin.ts
+++ b/src/addons/mod/assign/components/feedback-plugin/feedback-plugin.ts
@@ -104,20 +104,11 @@ export class AddonModAssignFeedbackPluginComponent implements OnInit {
      *
      * @return Promise resolved with the input data, rejected if cancelled.
      */
-    editFeedback(): Promise<AddonModAssignFeedbackCommentsTextData> {
+    async editFeedback(): Promise<AddonModAssignFeedbackCommentsTextData> {
         if (!this.canEdit) {
             throw new CoreError('Cannot edit feedback');
         }
 
-        return new Promise((resolve, reject): void => {
-            this.showEditFeedbackModal(resolve, reject);
-        });
-    }
-
-    protected async showEditFeedbackModal(
-        resolve: (value: AddonModAssignFeedbackCommentsTextData | PromiseLike<AddonModAssignFeedbackCommentsTextData>) => void,
-        reject: () => void,
-    ): Promise < void> {
         // Create the navigation modal.
         const modal = await ModalController.instance.create({
             component: AddonModAssignEditFeedbackModalComponent,
@@ -134,9 +125,9 @@ export class AddonModAssignFeedbackPluginComponent implements OnInit {
         const result = await modal.onDidDismiss();
 
         if (typeof result.data == 'undefined') {
-            reject();
+            throw null; // User cancelled.
         } else {
-            resolve(result.data);
+            return result.data;
         }
     }
 
diff --git a/src/addons/mod/assign/components/submission/addon-mod-assign-submission.html b/src/addons/mod/assign/components/submission/addon-mod-assign-submission.html
index 2185a1124..93a6b796f 100644
--- a/src/addons/mod/assign/components/submission/addon-mod-assign-submission.html
+++ b/src/addons/mod/assign/components/submission/addon-mod-assign-submission.html
@@ -1,7 +1,8 @@
 <core-loading [hideUntil]="loaded" class="core-loading-center">
 
     <!-- User and status of the submission. -->
-    <ion-item class="ion-text-wrap" *ngIf="!blindMarking && user" core-user-link [userId]="submitId" [courseId]="courseId" [title]="user!.fullname">
+    <ion-item class="ion-text-wrap" *ngIf="!blindMarking && user" core-user-link [userId]="submitId" [courseId]="courseId"
+        [title]="user!.fullname">
         <core-user-avatar [user]="user" slot="start"></core-user-avatar>
         <ion-label>
             <h2>{{ user!.fullname }}</h2>
diff --git a/src/addons/mod/assign/feedback/comments/comments.module.ts b/src/addons/mod/assign/feedback/comments/comments.module.ts
index 4581d686e..3cf1f28a5 100644
--- a/src/addons/mod/assign/feedback/comments/comments.module.ts
+++ b/src/addons/mod/assign/feedback/comments/comments.module.ts
@@ -28,7 +28,6 @@ import { AddonModAssignFeedbackDelegate } from '../../services/feedback-delegate
         CoreEditorComponentsModule,
     ],
     providers: [
-        AddonModAssignFeedbackCommentsHandler,
         {
             provide: APP_INITIALIZER,
             multi: true,
diff --git a/src/addons/mod/assign/feedback/editpdf/editpdf.module.ts b/src/addons/mod/assign/feedback/editpdf/editpdf.module.ts
index 1db4ecd21..c91596cb2 100644
--- a/src/addons/mod/assign/feedback/editpdf/editpdf.module.ts
+++ b/src/addons/mod/assign/feedback/editpdf/editpdf.module.ts
@@ -26,7 +26,6 @@ import { AddonModAssignFeedbackDelegate } from '../../services/feedback-delegate
         CoreSharedModule,
     ],
     providers: [
-        AddonModAssignFeedbackEditPdfHandler,
         {
             provide: APP_INITIALIZER,
             multi: true,
diff --git a/src/addons/mod/assign/feedback/file/file.module.ts b/src/addons/mod/assign/feedback/file/file.module.ts
index c4e59e063..45bfddd28 100644
--- a/src/addons/mod/assign/feedback/file/file.module.ts
+++ b/src/addons/mod/assign/feedback/file/file.module.ts
@@ -26,7 +26,6 @@ import { AddonModAssignFeedbackDelegate } from '../../services/feedback-delegate
         CoreSharedModule,
     ],
     providers: [
-        AddonModAssignFeedbackFileHandler,
         {
             provide: APP_INITIALIZER,
             multi: true,
diff --git a/src/addons/mod/assign/pages/edit/edit.ts b/src/addons/mod/assign/pages/edit/edit.ts
index 49198b4c4..0b6b1075d 100644
--- a/src/addons/mod/assign/pages/edit/edit.ts
+++ b/src/addons/mod/assign/pages/edit/edit.ts
@@ -15,7 +15,6 @@
 import { Component, OnInit, OnDestroy, ViewChild, ElementRef } from '@angular/core';
 import { ActivatedRoute } from '@angular/router';
 import { CoreError } from '@classes/errors/error';
-import { CoreIonLoadingElement } from '@classes/ion-loading';
 import { CoreFileUploaderHelper } from '@features/fileuploader/services/fileuploader-helper';
 import { CoreNavigator } from '@services/navigator';
 import { CoreSites, CoreSitesReadingStrategy } from '@services/sites';
@@ -208,26 +207,15 @@ export class AddonModAssignEditPage implements OnInit, OnDestroy {
      *
      * @return Promise resolved with boolean: whether data has changed.
      */
-    protected hasDataChanged(): Promise<boolean> {
+    protected async hasDataChanged(): Promise<boolean> {
         // Usually the hasSubmissionDataChanged call will be resolved inmediately, causing the modal to be shown just an instant.
         // We'll wait a bit before showing it to prevent this "blink".
-        let modal: CoreIonLoadingElement;
-        let showModal = true;
-
-        setTimeout(async () => {
-            if (showModal) {
-                modal = await CoreDomUtils.instance.showModalLoading();
-            }
-        }, 100);
+        const modal = await CoreDomUtils.instance.showModalLoading();
 
         const data = this.getInputData();
 
         return AddonModAssignHelper.instance.hasSubmissionDataChanged(this.assign!, this.userSubmission, data).finally(() => {
-            if (modal) {
-                modal.dismiss();
-            } else {
-                showModal = false;
-            }
+            modal.dismiss();
         });
     }
 
diff --git a/src/addons/mod/assign/services/assign-helper.ts b/src/addons/mod/assign/services/assign-helper.ts
index 0e797419d..178408d8b 100644
--- a/src/addons/mod/assign/services/assign-helper.ts
+++ b/src/addons/mod/assign/services/assign-helper.ts
@@ -245,7 +245,6 @@ export class AddonModAssignHelperProvider {
 
         // If no participants returned and all groups specified, get participants by groups.
         const groupsInfo = await CoreGroups.instance.getActivityGroupInfo(assign.cmid, false, undefined, modOptions.siteId);
-        [];
 
         const participantsIndexed: {[id: number]: AddonModAssignParticipant} = {};
 
@@ -582,7 +581,7 @@ export class AddonModAssignHelperProvider {
         siteId?: string,
     ): Promise<AddonModAssignSavePluginData> {
 
-        const pluginData = {};
+        const pluginData: Record<string, unknown> = {};
         const promises = feedback.plugins
             ? feedback.plugins.map((plugin) =>
                 AddonModAssignFeedbackDelegate.instance.preparePluginFeedbackData(assignId, userId, plugin, pluginData, siteId))
diff --git a/src/addons/mod/assign/services/assign.ts b/src/addons/mod/assign/services/assign.ts
index b1d63013b..3a11c8b94 100644
--- a/src/addons/mod/assign/services/assign.ts
+++ b/src/addons/mod/assign/services/assign.ts
@@ -31,6 +31,7 @@ import { AddonModAssignOffline } from './assign-offline';
 import { AddonModAssignSubmissionDelegate } from './submission-delegate';
 import { CoreComments } from '@features/comments/services/comments';
 import { AddonModAssignSubmissionFormatted } from './assign-helper';
+import { CoreWSError } from '@classes/errors/wserror';
 
 const ROOT_CACHE_KEY = 'mmaModAssign:';
 
@@ -1119,7 +1120,7 @@ export class AddonModAssignProvider {
 
         if (warnings.length) {
             // The WebService returned warnings, reject.
-            throw warnings[0];
+            throw new CoreWSError(warnings[0]);
         }
     }
 
@@ -1202,7 +1203,7 @@ export class AddonModAssignProvider {
 
         if (warnings.length) {
             // The WebService returned warnings, reject.
-            throw warnings[0];
+            throw new CoreWSError(warnings[0]);
         }
     }
 
@@ -1371,7 +1372,7 @@ export class AddonModAssignProvider {
 
             if (warnings.length) {
                 // The WebService returned warnings, reject.
-                throw warnings[0];
+                throw new CoreWSError(warnings[0]);
             }
         }
 
diff --git a/src/addons/mod/assign/services/database/assign.ts b/src/addons/mod/assign/services/database/assign.ts
index 949a1e580..7a4a608f1 100644
--- a/src/addons/mod/assign/services/database/assign.ts
+++ b/src/addons/mod/assign/services/database/assign.ts
@@ -16,7 +16,8 @@ import { CoreSiteSchema } from '@services/sites';
 
 /**
  * Database variables for AddonModAssignOfflineProvider.
- */export const SUBMISSIONS_TABLE = 'addon_mod_assign_submissions';
+ */
+export const SUBMISSIONS_TABLE = 'addon_mod_assign_submissions';
 export const SUBMISSIONS_GRADES_TABLE = 'addon_mod_assign_submissions_grading';
 export const OFFLINE_SITE_SCHEMA: CoreSiteSchema = {
     name: 'AddonModAssignOfflineProvider',
diff --git a/src/addons/mod/assign/submission/comments/comments.module.ts b/src/addons/mod/assign/submission/comments/comments.module.ts
index bb05dbd18..91faee3aa 100644
--- a/src/addons/mod/assign/submission/comments/comments.module.ts
+++ b/src/addons/mod/assign/submission/comments/comments.module.ts
@@ -28,7 +28,6 @@ import { CoreCommentsComponentsModule } from '@features/comments/components/comp
         CoreCommentsComponentsModule,
     ],
     providers: [
-        AddonModAssignSubmissionCommentsHandler,
         {
             provide: APP_INITIALIZER,
             multi: true,
diff --git a/src/addons/mod/assign/submission/file/file.module.ts b/src/addons/mod/assign/submission/file/file.module.ts
index cf97e85f7..be02d065a 100644
--- a/src/addons/mod/assign/submission/file/file.module.ts
+++ b/src/addons/mod/assign/submission/file/file.module.ts
@@ -26,7 +26,6 @@ import { AddonModAssignSubmissionDelegate } from '../../services/submission-dele
         CoreSharedModule,
     ],
     providers: [
-        AddonModAssignSubmissionFileHandler,
         {
             provide: APP_INITIALIZER,
             multi: true,
diff --git a/src/addons/mod/assign/submission/onlinetext/onlinetext.module.ts b/src/addons/mod/assign/submission/onlinetext/onlinetext.module.ts
index cbcaaa5ba..77a69e767 100644
--- a/src/addons/mod/assign/submission/onlinetext/onlinetext.module.ts
+++ b/src/addons/mod/assign/submission/onlinetext/onlinetext.module.ts
@@ -28,7 +28,6 @@ import { AddonModAssignSubmissionDelegate } from '../../services/submission-dele
         CoreEditorComponentsModule,
     ],
     providers: [
-        AddonModAssignSubmissionOnlineTextHandler,
         {
             provide: APP_INITIALIZER,
             multi: true,
diff --git a/src/core/classes/ion-loading.ts b/src/core/classes/ion-loading.ts
index 450e0aced..5f4dc9e2a 100644
--- a/src/core/classes/ion-loading.ts
+++ b/src/core/classes/ion-loading.ts
@@ -42,7 +42,7 @@ export class CoreIonLoadingElement {
      * Present the loading.
      */
     async present(): Promise<void> {
-        // Wait a bit before presenting the modal, to prevent it being displayed if dissmiss is called fast.
+        // Wait a bit before presenting the modal, to prevent it being displayed if dismiss is called fast.
         await CoreUtils.instance.wait(40);
 
         if (!this.isDismissed) {