diff --git a/src/public/app/components/app_context.ts b/src/public/app/components/app_context.ts
index e9084c4da..63e3144c2 100644
--- a/src/public/app/components/app_context.ts
+++ b/src/public/app/components/app_context.ts
@@ -113,6 +113,8 @@ export type CommandMappings = {
     openNoteInNewWindow: CommandData;
     hideLeftPane: CommandData;
     showLeftPane: CommandData;
+    leaveProtectedSession: CommandData;
+    enterProtectedSession: CommandData;
 
     openInTab: ContextMenuCommandData;
     openNoteInSplit: ContextMenuCommandData;
@@ -214,6 +216,9 @@ export type CommandMappings = {
     scrollContainerToCommand: CommandData & {
         position: number;
     };
+    moveThisNoteSplit: CommandData & {
+        isMovingLeft: boolean;
+    };
 
     // Geomap
     deleteFromMap: { noteId: string },
@@ -295,6 +300,7 @@ type EventMappings = {
     noteContextReorderEvent: {
         oldMainNtxId: string;
         newMainNtxId: string;
+        ntxIdsInOrder: string[];
     };
     newNoteContextCreated: {
         noteContext: NoteContext;
@@ -303,7 +309,7 @@ type EventMappings = {
         ntxIds: string[];
     };
     exportSvg: {
-        ntxId: string;
+        ntxId: string | null | undefined;
     };
     geoMapCreateChildNote: {
         ntxId: string | null | undefined; // TODO: deduplicate ntxId
diff --git a/src/public/app/widgets/bookmark_switch.js b/src/public/app/widgets/bookmark_switch.ts
similarity index 66%
rename from src/public/app/widgets/bookmark_switch.js
rename to src/public/app/widgets/bookmark_switch.ts
index 1bd28ccd2..8ec8b88b5 100644
--- a/src/public/app/widgets/bookmark_switch.js
+++ b/src/public/app/widgets/bookmark_switch.ts
@@ -2,13 +2,23 @@ import SwitchWidget from "./switch.js";
 import server from "../services/server.js";
 import toastService from "../services/toast.js";
 import { t } from "../services/i18n.js";
+import type FNote from "../entities/fnote.js";
+import type { EventData } from "../components/app_context.js";
+
+// TODO: Deduplicate
+type Response = {
+    success: true;
+} | {
+    success: false;
+    message: string;
+}
 
 export default class BookmarkSwitchWidget extends SwitchWidget {
     isEnabled() {
         return (
             super.isEnabled() &&
             // it's not possible to bookmark root because that would clone it under bookmarks and thus create a cycle
-            !["root", "_hidden"].includes(this.noteId)
+            !["root", "_hidden"].includes(this.noteId ?? "")
         );
     }
 
@@ -22,21 +32,21 @@ export default class BookmarkSwitchWidget extends SwitchWidget {
         this.switchOffTooltip = t("bookmark_switch.remove_bookmark");
     }
 
-    async toggle(state) {
-        const resp = await server.put(`notes/${this.noteId}/toggle-in-parent/_lbBookmarks/${!!state}`);
+    async toggle(state: boolean | null | undefined) {
+        const resp = await server.put<Response>(`notes/${this.noteId}/toggle-in-parent/_lbBookmarks/${!!state}`);
 
         if (!resp.success) {
             toastService.showError(resp.message);
         }
     }
 
-    async refreshWithNote(note) {
+    async refreshWithNote(note: FNote) {
         const isBookmarked = !!note.getParentBranches().find((b) => b.parentNoteId === "_lbBookmarks");
 
         this.isToggled = isBookmarked;
     }
 
-    entitiesReloadedEvent({ loadResults }) {
+    entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">) {
         if (loadResults.getBranchRows().find((b) => b.noteId === this.noteId)) {
             this.refresh();
         }
diff --git a/src/public/app/widgets/buttons/abstract_button.ts b/src/public/app/widgets/buttons/abstract_button.ts
index c30c23593..2ba16f8cc 100644
--- a/src/public/app/widgets/buttons/abstract_button.ts
+++ b/src/public/app/widgets/buttons/abstract_button.ts
@@ -19,7 +19,7 @@ export default class AbstractButtonWidget<SettingsT extends AbstractButtonWidget
     protected settings!: SettingsT;
     protected tooltip!: bootstrap.Tooltip;
 
-    isEnabled() {
+    isEnabled(): boolean | null | undefined {
         return true;
     }
 
diff --git a/src/public/app/widgets/buttons/button_from_note.js b/src/public/app/widgets/buttons/button_from_note.ts
similarity index 66%
rename from src/public/app/widgets/buttons/button_from_note.js
rename to src/public/app/widgets/buttons/button_from_note.ts
index 8e64acb41..64e680257 100644
--- a/src/public/app/widgets/buttons/button_from_note.js
+++ b/src/public/app/widgets/buttons/button_from_note.ts
@@ -1,15 +1,19 @@
 import froca from "../../services/froca.js";
 import attributeService from "../../services/attributes.js";
 import CommandButtonWidget from "./command_button.js";
+import type { EventData } from "../../components/app_context.js";
+
+export type ButtonNoteIdProvider = () => string;
 
 export default class ButtonFromNoteWidget extends CommandButtonWidget {
+
     constructor() {
         super();
 
         this.settings.buttonNoteIdProvider = null;
     }
 
-    buttonNoteIdProvider(provider) {
+    buttonNoteIdProvider(provider: ButtonNoteIdProvider) {
         this.settings.buttonNoteIdProvider = provider;
         return this;
     }
@@ -21,6 +25,11 @@ export default class ButtonFromNoteWidget extends CommandButtonWidget {
     }
 
     updateIcon() {
+        if (!this.settings.buttonNoteIdProvider) {
+            console.error(`buttonNoteId for '${this.componentId}' is not defined.`);
+            return;
+        }
+
         const buttonNoteId = this.settings.buttonNoteIdProvider();
 
         if (!buttonNoteId) {
@@ -29,13 +38,18 @@ export default class ButtonFromNoteWidget extends CommandButtonWidget {
         }
 
         froca.getNote(buttonNoteId).then((note) => {
-            this.settings.icon = note.getIcon();
+            const icon = note?.getIcon();
+            if (icon) {
+                this.settings.icon = icon;
+            }
 
             this.refreshIcon();
         });
     }
 
-    entitiesReloadedEvent({ loadResults }) {
+    entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">) {
+        // TODO: this seems incorrect
+        //@ts-ignore
         const buttonNote = froca.getNoteFromCache(this.buttonNoteIdProvider());
 
         if (!buttonNote) {
diff --git a/src/public/app/widgets/buttons/close_pane_button.js b/src/public/app/widgets/buttons/close_pane_button.ts
similarity index 85%
rename from src/public/app/widgets/buttons/close_pane_button.js
rename to src/public/app/widgets/buttons/close_pane_button.ts
index c41bdfc10..09e9aef11 100644
--- a/src/public/app/widgets/buttons/close_pane_button.js
+++ b/src/public/app/widgets/buttons/close_pane_button.ts
@@ -1,3 +1,4 @@
+import type { EventData } from "../../components/app_context.js";
 import { t } from "../../services/i18n.js";
 import OnClickButtonWidget from "./onclick_button.js";
 
@@ -11,7 +12,7 @@ export default class ClosePaneButton extends OnClickButtonWidget {
         );
     }
 
-    async noteContextReorderEvent({ ntxIdsInOrder }) {
+    async noteContextReorderEvent({ ntxIdsInOrder }: EventData<"noteContextReorderEvent">) {
         this.refresh();
     }
 
diff --git a/src/public/app/widgets/buttons/command_button.ts b/src/public/app/widgets/buttons/command_button.ts
index 8929f49a8..ba32fb7f8 100644
--- a/src/public/app/widgets/buttons/command_button.ts
+++ b/src/public/app/widgets/buttons/command_button.ts
@@ -1,6 +1,7 @@
 import type { CommandNames } from "../../components/app_context.js";
 import keyboardActionsService, { type Action } from "../../services/keyboard_actions.js";
 import AbstractButtonWidget, { type AbstractButtonWidgetSettings } from "./abstract_button.js";
+import type { ButtonNoteIdProvider } from "./button_from_note.js";
 
 let actions: Action[];
 
@@ -13,6 +14,7 @@ type CommandOrCallback = CommandNames | (() => CommandNames);
 interface CommandButtonWidgetSettings extends AbstractButtonWidgetSettings {
     command?: CommandOrCallback;
     onClick?: ClickHandler;
+    buttonNoteIdProvider?: ButtonNoteIdProvider | null;
 }
 
 export default class CommandButtonWidget extends AbstractButtonWidget<CommandButtonWidgetSettings> {
diff --git a/src/public/app/widgets/buttons/create_pane_button.js b/src/public/app/widgets/buttons/create_pane_button.ts
similarity index 100%
rename from src/public/app/widgets/buttons/create_pane_button.js
rename to src/public/app/widgets/buttons/create_pane_button.ts
diff --git a/src/public/app/widgets/buttons/move_pane_button.js b/src/public/app/widgets/buttons/move_pane_button.ts
similarity index 95%
rename from src/public/app/widgets/buttons/move_pane_button.js
rename to src/public/app/widgets/buttons/move_pane_button.ts
index fa1a73783..b1df66991 100644
--- a/src/public/app/widgets/buttons/move_pane_button.js
+++ b/src/public/app/widgets/buttons/move_pane_button.ts
@@ -3,7 +3,10 @@ import appContext from "../../components/app_context.js";
 import { t } from "../../services/i18n.js";
 
 export default class MovePaneButton extends OnClickButtonWidget {
-    constructor(isMovingLeft) {
+
+    private isMovingLeft: boolean;
+
+    constructor(isMovingLeft: boolean) {
         super();
 
         this.isMovingLeft = isMovingLeft;
diff --git a/src/public/app/widgets/buttons/open_note_button_widget.js b/src/public/app/widgets/buttons/open_note_button_widget.ts
similarity index 72%
rename from src/public/app/widgets/buttons/open_note_button_widget.js
rename to src/public/app/widgets/buttons/open_note_button_widget.ts
index 279c5d670..950ded0a6 100644
--- a/src/public/app/widgets/buttons/open_note_button_widget.js
+++ b/src/public/app/widgets/buttons/open_note_button_widget.ts
@@ -2,9 +2,13 @@ import OnClickButtonWidget from "./onclick_button.js";
 import linkContextMenuService from "../../menus/link_context_menu.js";
 import utils from "../../services/utils.js";
 import appContext from "../../components/app_context.js";
+import type FNote from "../../entities/fnote.js";
 
 export default class OpenNoteButtonWidget extends OnClickButtonWidget {
-    constructor(noteToOpen) {
+
+    private noteToOpen: FNote;
+
+    constructor(noteToOpen: FNote) {
         super();
 
         this.noteToOpen = noteToOpen;
@@ -13,10 +17,14 @@ export default class OpenNoteButtonWidget extends OnClickButtonWidget {
             .icon(() => this.noteToOpen.getIcon())
             .onClick((widget, evt) => this.launch(evt))
             .onAuxClick((widget, evt) => this.launch(evt))
-            .onContextMenu((evt) => linkContextMenuService.openContextMenu(this.noteToOpen.noteId, evt));
+            .onContextMenu((evt) => {
+                if (evt) {
+                    linkContextMenuService.openContextMenu(this.noteToOpen.noteId, evt);
+                }
+            });
     }
 
-    async launch(evt) {
+    async launch(evt: JQuery.ClickEvent | JQuery.TriggeredEvent | JQuery.ContextMenuEvent) {
         if (evt.which === 3) {
             return;
         }
diff --git a/src/public/app/widgets/buttons/protected_session_status.js b/src/public/app/widgets/buttons/protected_session_status.ts
similarity index 100%
rename from src/public/app/widgets/buttons/protected_session_status.js
rename to src/public/app/widgets/buttons/protected_session_status.ts
diff --git a/src/public/app/widgets/dialogs/password_not_set.js b/src/public/app/widgets/dialogs/password_not_set.ts
similarity index 88%
rename from src/public/app/widgets/dialogs/password_not_set.js
rename to src/public/app/widgets/dialogs/password_not_set.ts
index b8816f370..be608a4c2 100644
--- a/src/public/app/widgets/dialogs/password_not_set.js
+++ b/src/public/app/widgets/dialogs/password_not_set.ts
@@ -12,7 +12,7 @@ const TPL = `
             </div>
             <div class="modal-body">
                 ${t("password_not_set.body1")}
-                
+
                 ${t("password_not_set.body2")}
             </div>
         </div>
@@ -21,8 +21,13 @@ const TPL = `
 `;
 
 export default class PasswordNoteSetDialog extends BasicWidget {
+
+    private modal!: bootstrap.Modal;
+    private $openPasswordOptionsButton!: JQuery<HTMLElement>;
+
     doRender() {
         this.$widget = $(TPL);
+        //@ts-ignore fix once bootstrap is imported via JQuery.
         this.modal = bootstrap.Modal.getOrCreateInstance(this.$widget);
         this.$openPasswordOptionsButton = this.$widget.find(".open-password-options-button");
         this.$openPasswordOptionsButton.on("click", () => {
diff --git a/src/public/app/widgets/floating_buttons/copy_image_reference_button.js b/src/public/app/widgets/floating_buttons/copy_image_reference_button.ts
similarity index 81%
rename from src/public/app/widgets/floating_buttons/copy_image_reference_button.js
rename to src/public/app/widgets/floating_buttons/copy_image_reference_button.ts
index 64eff526b..534f895e5 100644
--- a/src/public/app/widgets/floating_buttons/copy_image_reference_button.js
+++ b/src/public/app/widgets/floating_buttons/copy_image_reference_button.ts
@@ -8,13 +8,16 @@ const TPL = `
         class="copy-image-reference-button"
         title="${t("copy_image_reference_button.button_title")}">
         <span class="bx bx-copy"></span>
-        
+
         <div class="hidden-image-copy"></div>
 </button>`;
 
 export default class CopyImageReferenceButton extends NoteContextAwareWidget {
+
+    private $hiddenImageCopy!: JQuery<HTMLElement>;
+
     isEnabled() {
-        return super.isEnabled() && ["mermaid", "canvas", "mindMap"].includes(this.note?.type) && this.note.isContentAvailable() && this.noteContext?.viewScope.viewMode === "default";
+        return super.isEnabled() && ["mermaid", "canvas", "mindMap"].includes(this.note?.type ?? "") && this.note?.isContentAvailable() && this.noteContext?.viewScope?.viewMode === "default";
     }
 
     doRender() {
@@ -24,6 +27,10 @@ export default class CopyImageReferenceButton extends NoteContextAwareWidget {
         this.$hiddenImageCopy = this.$widget.find(".hidden-image-copy");
 
         this.$widget.on("click", () => {
+            if (!this.note) {
+                return;
+            }
+
             this.$hiddenImageCopy.empty().append($("<img>").attr("src", utils.createImageSrcUrl(this.note)));
 
             imageService.copyImageReferenceToClipboard(this.$hiddenImageCopy);
diff --git a/src/public/app/widgets/floating_buttons/hide_floating_buttons_button.js b/src/public/app/widgets/floating_buttons/hide_floating_buttons_button.ts
similarity index 100%
rename from src/public/app/widgets/floating_buttons/hide_floating_buttons_button.js
rename to src/public/app/widgets/floating_buttons/hide_floating_buttons_button.ts
diff --git a/src/public/app/widgets/floating_buttons/svg_export_button.js b/src/public/app/widgets/floating_buttons/svg_export_button.ts
similarity index 84%
rename from src/public/app/widgets/floating_buttons/svg_export_button.js
rename to src/public/app/widgets/floating_buttons/svg_export_button.ts
index b098b18c2..92fa33f41 100644
--- a/src/public/app/widgets/floating_buttons/svg_export_button.js
+++ b/src/public/app/widgets/floating_buttons/svg_export_button.ts
@@ -11,7 +11,7 @@ const TPL = `
 
 export default class SvgExportButton extends NoteContextAwareWidget {
     isEnabled() {
-        return super.isEnabled() && ["mermaid", "mindMap"].includes(this.note?.type) && this.note.isContentAvailable() && this.noteContext?.viewScope.viewMode === "default";
+        return super.isEnabled() && ["mermaid", "mindMap"].includes(this.note?.type ?? "") && this.note?.isContentAvailable() && this.noteContext?.viewScope?.viewMode === "default";
     }
 
     doRender() {
diff --git a/src/public/app/widgets/protected_note_switch.js b/src/public/app/widgets/protected_note_switch.ts
similarity index 61%
rename from src/public/app/widgets/protected_note_switch.js
rename to src/public/app/widgets/protected_note_switch.ts
index 134a3633a..e4926ae84 100644
--- a/src/public/app/widgets/protected_note_switch.js
+++ b/src/public/app/widgets/protected_note_switch.ts
@@ -1,3 +1,5 @@
+import type { EventData } from "../components/app_context.js";
+import type FNote from "../entities/fnote.js";
 import { t } from "../services/i18n.js";
 import protectedSessionService from "../services/protected_session.js";
 import SwitchWidget from "./switch.js";
@@ -14,18 +16,22 @@ export default class ProtectedNoteSwitchWidget extends SwitchWidget {
     }
 
     switchOn() {
-        protectedSessionService.protectNote(this.noteId, true, false);
+        if (this.noteId) {
+            protectedSessionService.protectNote(this.noteId, true, false);
+        }
     }
 
     switchOff() {
-        protectedSessionService.protectNote(this.noteId, false, false);
+        if (this.noteId) {
+            protectedSessionService.protectNote(this.noteId, false, false);
+        }
     }
 
-    async refreshWithNote(note) {
+    async refreshWithNote(note: FNote) {
         this.isToggled = note.isProtected;
     }
 
-    entitiesReloadedEvent({ loadResults }) {
+    entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">) {
         if (loadResults.isNoteReloaded(this.noteId)) {
             this.refresh();
         }
diff --git a/src/public/app/widgets/quick_search_launcher.js b/src/public/app/widgets/quick_search_launcher.ts
similarity index 89%
rename from src/public/app/widgets/quick_search_launcher.js
rename to src/public/app/widgets/quick_search_launcher.ts
index 2cd906470..f64d1ca1d 100644
--- a/src/public/app/widgets/quick_search_launcher.js
+++ b/src/public/app/widgets/quick_search_launcher.ts
@@ -10,7 +10,10 @@ import QuickSearchWidget from "./quick_search.js";
  * - Hiding the widget on mobile.
  */
 export default class QuickSearchLauncherWidget extends QuickSearchWidget {
-    constructor(isHorizontalLayout) {
+
+    private isHorizontalLayout: boolean;
+
+    constructor(isHorizontalLayout: boolean) {
         super();
         this.isHorizontalLayout = isHorizontalLayout;
     }
diff --git a/src/public/app/widgets/ribbon_widgets/note_properties.js b/src/public/app/widgets/ribbon_widgets/note_properties.ts
similarity index 88%
rename from src/public/app/widgets/ribbon_widgets/note_properties.js
rename to src/public/app/widgets/ribbon_widgets/note_properties.ts
index 4aacdcba0..bfccfe51f 100644
--- a/src/public/app/widgets/ribbon_widgets/note_properties.js
+++ b/src/public/app/widgets/ribbon_widgets/note_properties.ts
@@ -1,3 +1,4 @@
+import type FNote from "../../entities/fnote.js";
 import { t } from "../../services/i18n.js";
 import NoteContextAwareWidget from "../note_context_aware_widget.js";
 
@@ -19,6 +20,9 @@ const TPL = `
  * TODO: figure out better name or conceptualize better.
  */
 export default class NotePropertiesWidget extends NoteContextAwareWidget {
+
+    private $pageUrl!: JQuery<HTMLElement>;
+
     isEnabled() {
         return this.note && !!this.note.getLabelValue("pageUrl");
     }
@@ -39,9 +43,9 @@ export default class NotePropertiesWidget extends NoteContextAwareWidget {
         this.$pageUrl = this.$widget.find(".page-url");
     }
 
-    async refreshWithNote(note) {
+    async refreshWithNote(note: FNote) {
         const pageUrl = note.getLabelValue("pageUrl");
 
-        this.$pageUrl.attr("href", pageUrl).attr("title", pageUrl).text(pageUrl);
+        this.$pageUrl.attr("href", pageUrl).attr("title", pageUrl).text(pageUrl ?? "");
     }
 }
diff --git a/src/public/app/widgets/search_options/debug.js b/src/public/app/widgets/search_options/debug.ts
similarity index 96%
rename from src/public/app/widgets/search_options/debug.js
rename to src/public/app/widgets/search_options/debug.ts
index 9a732507b..46d314fca 100644
--- a/src/public/app/widgets/search_options/debug.js
+++ b/src/public/app/widgets/search_options/debug.ts
@@ -27,7 +27,7 @@ export default class Debug extends AbstractSearchOption {
         return "label";
     }
 
-    static async create(noteId) {
+    static async create(noteId: string) {
         await AbstractSearchOption.setAttribute(noteId, "label", "debug");
     }
 
diff --git a/src/public/app/widgets/search_options/fast_search.js b/src/public/app/widgets/search_options/fast_search.ts
similarity index 94%
rename from src/public/app/widgets/search_options/fast_search.js
rename to src/public/app/widgets/search_options/fast_search.ts
index b49e0eee6..70b89619a 100644
--- a/src/public/app/widgets/search_options/fast_search.js
+++ b/src/public/app/widgets/search_options/fast_search.ts
@@ -12,7 +12,7 @@ const TPL = `
             <span class="bx bx-help-circle icon-action" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false"></span>
             <div class="dropdown-menu dropdown-menu-right p-4">
                 ${t("fast_search.description")}
-            </div> 
+            </div>
         </div>
         <span class="bx bx-x icon-action search-option-del"></span>
     </td>
@@ -26,7 +26,7 @@ export default class FastSearch extends AbstractSearchOption {
         return "label";
     }
 
-    static async create(noteId) {
+    static async create(noteId: string) {
         await AbstractSearchOption.setAttribute(noteId, "label", "fastSearch");
     }
 
diff --git a/src/public/app/widgets/search_options/include_archived_notes.js b/src/public/app/widgets/search_options/include_archived_notes.ts
similarity index 94%
rename from src/public/app/widgets/search_options/include_archived_notes.js
rename to src/public/app/widgets/search_options/include_archived_notes.ts
index 0e461d05e..ad7754196 100644
--- a/src/public/app/widgets/search_options/include_archived_notes.js
+++ b/src/public/app/widgets/search_options/include_archived_notes.ts
@@ -20,7 +20,7 @@ export default class IncludeArchivedNotes extends AbstractSearchOption {
         return "label";
     }
 
-    static async create(noteId) {
+    static async create(noteId: string) {
         await AbstractSearchOption.setAttribute(noteId, "label", "includeArchivedNotes");
     }
 
diff --git a/src/public/app/widgets/switch.ts b/src/public/app/widgets/switch.ts
index 585ab9045..aff5587c9 100644
--- a/src/public/app/widgets/switch.ts
+++ b/src/public/app/widgets/switch.ts
@@ -123,13 +123,13 @@ export default class SwitchWidget extends NoteContextAwareWidget {
     private $switchButton!: JQuery<HTMLElement>;
     private $switchToggle!: JQuery<HTMLElement>;
     private $switchName!: JQuery<HTMLElement>;
-    private $helpButton!: JQuery<HTMLElement>;
+    protected $helpButton!: JQuery<HTMLElement>;
 
-    private switchOnName = "";
-    private switchOnTooltip = "";
+    protected switchOnName = "";
+    protected switchOnTooltip = "";
 
-    private switchOffName = "";
-    private switchOffTooltip = "";
+    protected switchOffName = "";
+    protected switchOffTooltip = "";
 
     private disabledTooltip = "";
 
diff --git a/src/public/app/widgets/template_switch.js b/src/public/app/widgets/template_switch.ts
similarity index 63%
rename from src/public/app/widgets/template_switch.js
rename to src/public/app/widgets/template_switch.ts
index 6205b95c6..572426020 100644
--- a/src/public/app/widgets/template_switch.js
+++ b/src/public/app/widgets/template_switch.ts
@@ -1,13 +1,16 @@
 import SwitchWidget from "./switch.js";
 import attributeService from "../services/attributes.js";
 import { t } from "../services/i18n.js";
+import type { EventData } from "../components/app_context.js";
+import type FNote from "../entities/fnote.js";
 
 /**
  * Switch for the basic properties widget which allows the user to select whether the note is a template or not, which toggles the `#template` attribute.
  */
 export default class TemplateSwitchWidget extends SwitchWidget {
+
     isEnabled() {
-        return super.isEnabled() && !this.noteId.startsWith("_options");
+        return super.isEnabled() && !this.noteId?.startsWith("_options");
     }
 
     doRender() {
@@ -23,21 +26,25 @@ export default class TemplateSwitchWidget extends SwitchWidget {
     }
 
     async switchOn() {
-        await attributeService.setLabel(this.noteId, "template");
-    }
-
-    async switchOff() {
-        for (const templateAttr of this.note.getOwnedLabels("template")) {
-            await attributeService.removeAttributeById(this.noteId, templateAttr.attributeId);
+        if (this.noteId) {
+            await attributeService.setLabel(this.noteId, "template");
         }
     }
 
-    async refreshWithNote(note) {
+    async switchOff() {
+        if (this.note && this.noteId) {
+            for (const templateAttr of this.note.getOwnedLabels("template")) {
+                await attributeService.removeAttributeById(this.noteId, templateAttr.attributeId);
+            }
+        }
+    }
+
+    async refreshWithNote(note: FNote) {
         const isTemplate = note.hasLabel("template");
         this.isToggled = isTemplate;
     }
 
-    entitiesReloadedEvent({ loadResults }) {
+    entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">) {
         if (loadResults.getAttributeRows().find((attr) => attr.type === "label" && attr.name === "template" && attr.noteId === this.noteId)) {
             this.refresh();
         }
diff --git a/src/public/app/widgets/type_widgets/book.js b/src/public/app/widgets/type_widgets/book.ts
similarity index 80%
rename from src/public/app/widgets/type_widgets/book.js
rename to src/public/app/widgets/type_widgets/book.ts
index 17276c396..bb872d50e 100644
--- a/src/public/app/widgets/type_widgets/book.js
+++ b/src/public/app/widgets/type_widgets/book.ts
@@ -1,5 +1,6 @@
 import TypeWidget from "./type_widget.js";
 import { t } from "../../services/i18n.js";
+import type FNote from "../../entities/fnote.js";
 
 const TPL = `
 <div class="note-detail-book note-detail-printable">
@@ -19,6 +20,9 @@ const TPL = `
 </div>`;
 
 export default class BookTypeWidget extends TypeWidget {
+
+    private $helpNoChildren!: JQuery<HTMLElement>;
+
     static getType() {
         return "book";
     }
@@ -30,7 +34,7 @@ export default class BookTypeWidget extends TypeWidget {
         super.doRender();
     }
 
-    async doRefresh(note) {
-        this.$helpNoChildren.toggle(!this.note.hasChildren());
+    async doRefresh(note: FNote) {
+        this.$helpNoChildren.toggle(!this.note?.hasChildren());
     }
 }
diff --git a/src/public/app/widgets/type_widgets/note_map.js b/src/public/app/widgets/type_widgets/note_map.ts
similarity index 82%
rename from src/public/app/widgets/type_widgets/note_map.js
rename to src/public/app/widgets/type_widgets/note_map.ts
index dea9a9f00..c942b3d89 100644
--- a/src/public/app/widgets/type_widgets/note_map.js
+++ b/src/public/app/widgets/type_widgets/note_map.ts
@@ -1,9 +1,13 @@
 import TypeWidget from "./type_widget.js";
 import NoteMapWidget from "../note_map.js";
+import type FNote from "../../entities/fnote.js";
 
 const TPL = `<div class="note-detail-note-map note-detail-printable"></div>`;
 
 export default class NoteMapTypeWidget extends TypeWidget {
+
+    private noteMapWidget: NoteMapWidget;
+
     static getType() {
         return "noteMap";
     }
@@ -22,7 +26,7 @@ export default class NoteMapTypeWidget extends TypeWidget {
         super.doRender();
     }
 
-    async doRefresh(note) {
+    async doRefresh(note: FNote) {
         await this.noteMapWidget.refresh();
     }
 }