diff --git a/framework/core/js/src/admin/AdminApplication.ts b/framework/core/js/src/admin/AdminApplication.ts
index 301662cdfe..5a712ddb12 100644
--- a/framework/core/js/src/admin/AdminApplication.ts
+++ b/framework/core/js/src/admin/AdminApplication.ts
@@ -37,6 +37,8 @@ export interface AdminApplicationData extends ApplicationData {
   extensions: Record<string, Extension>;
   settings: Record<string, string>;
   modelStatistics: Record<string, { total: number }>;
+  displayNameDrivers: string[];
+  slugDrivers: Record<string, string[]>;
 }
 
 export default class AdminApplication extends Application {
diff --git a/framework/core/js/src/admin/components/AdminPage.tsx b/framework/core/js/src/admin/components/AdminPage.tsx
index 658fd53f39..80c663364a 100644
--- a/framework/core/js/src/admin/components/AdminPage.tsx
+++ b/framework/core/js/src/admin/components/AdminPage.tsx
@@ -60,7 +60,7 @@ export type HTMLInputTypes =
 
 export interface CommonSettingsItemOptions extends Mithril.Attributes {
   setting: string;
-  label: Mithril.Children;
+  label?: Mithril.Children;
   help?: Mithril.Children;
   className?: string;
 }
@@ -137,6 +137,8 @@ export type AdminHeaderAttrs = AdminHeaderOptions & Partial<Omit<Mithril.Attribu
 export type SettingValue = string;
 export type MutableSettings = Record<string, Stream<SettingValue>>;
 
+export type SaveSubmitEvent = SubmitEvent & { redraw: boolean };
+
 export default abstract class AdminPage<CustomAttrs extends IPageAttrs = IPageAttrs> extends Page<CustomAttrs> {
   settings: MutableSettings = {};
   loading: boolean = false;
@@ -162,7 +164,7 @@ export default abstract class AdminPage<CustomAttrs extends IPageAttrs = IPageAt
    *
    * Calls `this.saveSettings` when the button is clicked.
    */
-  submitButton(vnode: Mithril.Vnode<CustomAttrs, this>): Mithril.Children {
+  submitButton(): Mithril.Children {
     return (
       <Button onclick={this.saveSettings.bind(this)} className="Button Button--primary" loading={this.loading} disabled={!this.isChanged()}>
         {app.translator.trans('core.admin.settings.submit_button')}
@@ -385,7 +387,7 @@ export default abstract class AdminPage<CustomAttrs extends IPageAttrs = IPageAt
   /**
    * Saves the modified settings to the database.
    */
-  saveSettings(e: SubmitEvent & { redraw: boolean }) {
+  saveSettings(e: SaveSubmitEvent) {
     e.preventDefault();
 
     app.alerts.clear();
diff --git a/framework/core/js/src/admin/components/AppearancePage.tsx b/framework/core/js/src/admin/components/AppearancePage.tsx
index 02aede4bab..e167b05064 100644
--- a/framework/core/js/src/admin/components/AppearancePage.tsx
+++ b/framework/core/js/src/admin/components/AppearancePage.tsx
@@ -6,6 +6,7 @@ import EditCustomFooterModal from './EditCustomFooterModal';
 import UploadImageButton from './UploadImageButton';
 import AdminPage from './AdminPage';
 import ItemList from '../../common/utils/ItemList';
+import type Mithril from 'mithril';
 
 export default class AppearancePage extends AdminPage {
   headerInfo() {
@@ -77,7 +78,7 @@ export default class AppearancePage extends AdminPage {
   }
 
   colorItems() {
-    const items = new ItemList();
+    const items = new ItemList<Mithril.Children>();
 
     items.add('helpText', <div className="helpText">{app.translator.trans('core.admin.appearance.colors_text')}</div>, 80);
 
diff --git a/framework/core/js/src/admin/components/BasicsPage.js b/framework/core/js/src/admin/components/BasicsPage.tsx
similarity index 84%
rename from framework/core/js/src/admin/components/BasicsPage.js
rename to framework/core/js/src/admin/components/BasicsPage.tsx
index 658eaca68d..a4400f0496 100644
--- a/framework/core/js/src/admin/components/BasicsPage.js
+++ b/framework/core/js/src/admin/components/BasicsPage.tsx
@@ -2,24 +2,27 @@ import app from '../../admin/app';
 import FieldSet from '../../common/components/FieldSet';
 import ItemList from '../../common/utils/ItemList';
 import AdminPage from './AdminPage';
+import type { IPageAttrs } from '../../common/components/Page';
+import type Mithril from 'mithril';
 
-export default class BasicsPage extends AdminPage {
-  oninit(vnode) {
+export type HomePageItem = { path: string; label: Mithril.Children };
+
+export default class BasicsPage<CustomAttrs extends IPageAttrs = IPageAttrs> extends AdminPage<CustomAttrs> {
+  localeOptions: Record<string, string> = {};
+  displayNameOptions: Record<string, string> = {};
+  slugDriverOptions: Record<string, Record<string, string>> = {};
+
+  oninit(vnode: Mithril.Vnode<CustomAttrs, this>) {
     super.oninit(vnode);
 
-    this.localeOptions = {};
-    const locales = app.data.locales;
-    for (const i in locales) {
-      this.localeOptions[i] = `${locales[i]} (${i})`;
-    }
+    Object.keys(app.data.locales).forEach((i) => {
+      this.localeOptions[i] = `${app.data.locales[i]} (${i})`;
+    });
 
-    this.displayNameOptions = {};
-    const displayNameDrivers = app.data.displayNameDrivers;
-    displayNameDrivers.forEach(function (identifier) {
+    app.data.displayNameDrivers.forEach((identifier) => {
       this.displayNameOptions[identifier] = identifier;
-    }, this);
+    });
 
-    this.slugDriverOptions = {};
     Object.keys(app.data.slugDrivers).forEach((model) => {
       this.slugDriverOptions[model] = {};
 
@@ -100,6 +103,7 @@ export default class BasicsPage extends AdminPage {
 
         {Object.keys(this.slugDriverOptions).map((model) => {
           const options = this.slugDriverOptions[model];
+
           if (Object.keys(options).length > 1) {
             return this.buildSettingComponent({
               type: 'select',
@@ -109,6 +113,8 @@ export default class BasicsPage extends AdminPage {
               help: app.translator.trans('core.admin.basics.slug_driver_text', { model }),
             });
           }
+
+          return null;
         })}
 
         {this.submitButton()}
@@ -119,11 +125,9 @@ export default class BasicsPage extends AdminPage {
   /**
    * Build a list of options for the default homepage. Each option must be an
    * object with `path` and `label` properties.
-   *
-   * @return {ItemList<{ path: string, label: import('mithril').Children }>}
    */
   homePageItems() {
-    const items = new ItemList();
+    const items = new ItemList<HomePageItem>();
 
     items.add('allDiscussions', {
       path: '/all',
diff --git a/framework/core/js/src/admin/components/ExtensionPage.tsx b/framework/core/js/src/admin/components/ExtensionPage.tsx
index fa6acccaa1..43657d29de 100644
--- a/framework/core/js/src/admin/components/ExtensionPage.tsx
+++ b/framework/core/js/src/admin/components/ExtensionPage.tsx
@@ -140,7 +140,7 @@ export default class ExtensionPage<Attrs extends ExtensionPageAttrs = ExtensionP
           {settings ? (
             <div className="Form">
               {settings.map(this.buildSettingComponent.bind(this))}
-              <div className="Form-group">{this.submitButton(vnode)}</div>
+              <div className="Form-group">{this.submitButton()}</div>
             </div>
           ) : (
             <h3 className="ExtensionPage-subHeader">{app.translator.trans('core.admin.extension.no_settings')}</h3>
diff --git a/framework/core/js/src/admin/components/MailPage.js b/framework/core/js/src/admin/components/MailPage.tsx
similarity index 69%
rename from framework/core/js/src/admin/components/MailPage.js
rename to framework/core/js/src/admin/components/MailPage.tsx
index 9ff161ee23..8ebc49484e 100644
--- a/framework/core/js/src/admin/components/MailPage.js
+++ b/framework/core/js/src/admin/components/MailPage.tsx
@@ -4,12 +4,30 @@ import Button from '../../common/components/Button';
 import Alert from '../../common/components/Alert';
 import LoadingIndicator from '../../common/components/LoadingIndicator';
 import AdminPage from './AdminPage';
+import type { IPageAttrs } from '../../common/components/Page';
+import type { AlertIdentifier } from '../../common/states/AlertManagerState';
+import type Mithril from 'mithril';
+import type { SaveSubmitEvent } from './AdminPage';
+
+export interface MailSettings {
+  data: {
+    attributes: {
+      fields: Record<string, any>;
+      sending: boolean;
+      errors: any[];
+    };
+  };
+}
+
+export default class MailPage<CustomAttrs extends IPageAttrs = IPageAttrs> extends AdminPage<CustomAttrs> {
+  sendingTest = false;
+  status?: { sending: boolean; errors: any };
+  driverFields?: Record<string, any>;
+  testEmailSuccessAlert?: AlertIdentifier;
 
-export default class MailPage extends AdminPage {
-  oninit(vnode) {
+  oninit(vnode: Mithril.Vnode<CustomAttrs, this>) {
     super.oninit(vnode);
 
-    this.sendingTest = false;
     this.refresh();
   }
 
@@ -28,14 +46,14 @@ export default class MailPage extends AdminPage {
     this.status = { sending: false, errors: {} };
 
     app
-      .request({
+      .request<MailSettings>({
         method: 'GET',
         url: app.forum.attribute('apiUrl') + '/mail/settings',
       })
       .then((response) => {
-        this.driverFields = response['data']['attributes']['fields'];
-        this.status.sending = response['data']['attributes']['sending'];
-        this.status.errors = response['data']['attributes']['errors'];
+        this.driverFields = response.data.attributes.fields;
+        this.status!.sending = response.data.attributes.sending;
+        this.status!.errors = response.data.attributes.errors;
 
         this.loading = false;
         m.redraw();
@@ -47,7 +65,7 @@ export default class MailPage extends AdminPage {
       return <LoadingIndicator />;
     }
 
-    const fields = this.driverFields[this.setting('mail_driver')()];
+    const fields = this.driverFields![this.setting('mail_driver')()];
     const fieldKeys = Object.keys(fields);
 
     return (
@@ -60,10 +78,10 @@ export default class MailPage extends AdminPage {
         {this.buildSettingComponent({
           type: 'select',
           setting: 'mail_driver',
-          options: Object.keys(this.driverFields).reduce((memo, val) => ({ ...memo, [val]: val }), {}),
+          options: Object.keys(this.driverFields!).reduce((memo, val) => ({ ...memo, [val]: val }), {}),
           label: app.translator.trans('core.admin.email.driver_heading'),
         })}
-        {this.status.sending ||
+        {this.status!.sending ||
           Alert.component(
             {
               dismissible: false,
@@ -84,7 +102,7 @@ export default class MailPage extends AdminPage {
                     setting: field,
                     options: fieldInfo,
                   }),
-                  this.status.errors[field] && <p className="ValidationError">{this.status.errors[field]}</p>,
+                  this.status!.errors[field] && <p className="ValidationError">{this.status!.errors[field]}</p>,
                 ];
               })}
             </div>
@@ -93,7 +111,7 @@ export default class MailPage extends AdminPage {
         {this.submitButton()}
 
         <FieldSet label={app.translator.trans('core.admin.email.send_test_mail_heading')} className="MailPage-MailSettings">
-          <div className="helpText">{app.translator.trans('core.admin.email.send_test_mail_text', { email: app.session.user.email() })}</div>
+          <div className="helpText">{app.translator.trans('core.admin.email.send_test_mail_text', { email: app.session.user!.email() })}</div>
           {Button.component(
             {
               className: 'Button Button--primary',
@@ -108,10 +126,11 @@ export default class MailPage extends AdminPage {
   }
 
   sendTestEmail() {
-    if (this.saving || this.sendingTest) return;
+    if (this.sendingTest) return;
 
     this.sendingTest = true;
-    app.alerts.dismiss(this.testEmailSuccessAlert);
+
+    if (this.testEmailSuccessAlert) app.alerts.dismiss(this.testEmailSuccessAlert);
 
     app
       .request({
@@ -129,7 +148,7 @@ export default class MailPage extends AdminPage {
       });
   }
 
-  saveSettings(e) {
-    super.saveSettings(e).then(this.refresh());
+  saveSettings(e: SaveSubmitEvent) {
+    return super.saveSettings(e).then(() => this.refresh());
   }
 }
diff --git a/framework/core/js/src/admin/components/PermissionsPage.js b/framework/core/js/src/admin/components/PermissionsPage.tsx
similarity index 96%
rename from framework/core/js/src/admin/components/PermissionsPage.js
rename to framework/core/js/src/admin/components/PermissionsPage.tsx
index c985fa35e3..1635484a95 100644
--- a/framework/core/js/src/admin/components/PermissionsPage.js
+++ b/framework/core/js/src/admin/components/PermissionsPage.tsx
@@ -20,8 +20,8 @@ export default class PermissionsPage extends AdminPage {
     return [
       <div className="PermissionsPage-groups">
         {app.store
-          .all('groups')
-          .filter((group) => [Group.GUEST_ID, Group.MEMBER_ID].indexOf(group.id()) === -1)
+          .all<Group>('groups')
+          .filter((group) => [Group.GUEST_ID, Group.MEMBER_ID].indexOf(group.id()!) === -1)
           .map((group) => (
             <button className="Button Group" onclick={() => app.modal.show(EditGroupModal, { group })}>
               {GroupBadge.component({
diff --git a/framework/core/js/src/forum/components/NotificationsPage.js b/framework/core/js/src/forum/components/NotificationsPage.tsx
similarity index 54%
rename from framework/core/js/src/forum/components/NotificationsPage.js
rename to framework/core/js/src/forum/components/NotificationsPage.tsx
index b88da964af..c6059c1635 100644
--- a/framework/core/js/src/forum/components/NotificationsPage.js
+++ b/framework/core/js/src/forum/components/NotificationsPage.tsx
@@ -1,16 +1,18 @@
 import app from '../../forum/app';
-import Page from '../../common/components/Page';
+import Page, { IPageAttrs } from '../../common/components/Page';
 import NotificationList from './NotificationList';
+import type Mithril from 'mithril';
+import extractText from '../../common/utils/extractText';
 
 /**
  * The `NotificationsPage` component shows the notifications list. It is only
  * used on mobile devices where the notifications dropdown is within the drawer.
  */
-export default class NotificationsPage extends Page {
-  oninit(vnode) {
+export default class NotificationsPage<CustomAttrs extends IPageAttrs = IPageAttrs> extends Page<CustomAttrs> {
+  oninit(vnode: Mithril.Vnode<CustomAttrs, this>) {
     super.oninit(vnode);
 
-    app.history.push('notifications');
+    app.history.push('notifications', extractText(app.translator.trans('core.forum.notifications.title')));
 
     app.notifications.load();
 
diff --git a/framework/core/js/src/forum/components/SettingsPage.js b/framework/core/js/src/forum/components/SettingsPage.tsx
similarity index 70%
rename from framework/core/js/src/forum/components/SettingsPage.js
rename to framework/core/js/src/forum/components/SettingsPage.tsx
index 40f82e20bc..347e99a1e2 100644
--- a/framework/core/js/src/forum/components/SettingsPage.js
+++ b/framework/core/js/src/forum/components/SettingsPage.tsx
@@ -1,5 +1,5 @@
 import app from '../../forum/app';
-import UserPage from './UserPage';
+import UserPage, { IUserPageAttrs } from './UserPage';
 import ItemList from '../../common/utils/ItemList';
 import Switch from '../../common/components/Switch';
 import Button from '../../common/components/Button';
@@ -8,18 +8,22 @@ import NotificationGrid from './NotificationGrid';
 import ChangePasswordModal from './ChangePasswordModal';
 import ChangeEmailModal from './ChangeEmailModal';
 import listItems from '../../common/helpers/listItems';
+import extractText from '../../common/utils/extractText';
+import type Mithril from 'mithril';
 
 /**
  * The `SettingsPage` component displays the user's settings control panel, in
  * the context of their user profile.
  */
-export default class SettingsPage extends UserPage {
-  oninit(vnode) {
+export default class SettingsPage<CustomAttrs extends IUserPageAttrs = IUserPageAttrs> extends UserPage<CustomAttrs> {
+  discloseOnlineLoading?: boolean;
+
+  oninit(vnode: Mithril.Vnode<CustomAttrs, this>) {
     super.oninit(vnode);
 
-    this.show(app.session.user);
+    this.show(app.session.user!);
 
-    app.setTitle(app.translator.trans('core.forum.settings.title'));
+    app.setTitle(extractText(app.translator.trans('core.forum.settings.title')));
   }
 
   content() {
@@ -32,17 +36,17 @@ export default class SettingsPage extends UserPage {
 
   /**
    * Build an item list for the user's settings controls.
-   *
-   * @return {ItemList<import('mithril').Children>}
    */
   settingsItems() {
-    const items = new ItemList();
+    const items = new ItemList<Mithril.Children>();
 
     ['account', 'notifications', 'privacy'].forEach((section) => {
+      const sectionItems = `${section}Items` as 'accountItems' | 'notificationsItems' | 'privacyItems';
+
       items.add(
         section,
         <FieldSet className={`Settings-${section}`} label={app.translator.trans(`core.forum.settings.${section}_heading`)}>
-          {this[`${section}Items`]().toArray()}
+          {this[sectionItems]().toArray()}
         </FieldSet>
       );
     });
@@ -52,11 +56,9 @@ export default class SettingsPage extends UserPage {
 
   /**
    * Build an item list for the user's account settings.
-   *
-   * @return {ItemList<import('mithril').Children>}
    */
   accountItems() {
-    const items = new ItemList();
+    const items = new ItemList<Mithril.Children>();
 
     items.add(
       'changePassword',
@@ -77,11 +79,9 @@ export default class SettingsPage extends UserPage {
 
   /**
    * Build an item list for the user's notification settings.
-   *
-   * @return {ItemList<import('mithril').Children>}
    */
   notificationsItems() {
-    const items = new ItemList();
+    const items = new ItemList<Mithril.Children>();
 
     items.add('notificationGrid', <NotificationGrid user={this.user} />);
 
@@ -90,20 +90,18 @@ export default class SettingsPage extends UserPage {
 
   /**
    * Build an item list for the user's privacy settings.
-   *
-   * @return {ItemList<import('mithril').Children>}
    */
   privacyItems() {
-    const items = new ItemList();
+    const items = new ItemList<Mithril.Children>();
 
     items.add(
       'discloseOnline',
       <Switch
-        state={this.user.preferences().discloseOnline}
-        onchange={(value) => {
+        state={this.user!.preferences()?.discloseOnline}
+        onchange={(value: boolean) => {
           this.discloseOnlineLoading = true;
 
-          this.user.savePreferences({ discloseOnline: value }).then(() => {
+          this.user!.savePreferences({ discloseOnline: value }).then(() => {
             this.discloseOnlineLoading = false;
             m.redraw();
           });