diff --git a/lib/Controller/VideoController.php b/lib/Controller/VideoController.php
index 3bbeea50..ab7889ad 100644
--- a/lib/Controller/VideoController.php
+++ b/lib/Controller/VideoController.php
@@ -171,8 +171,12 @@ class VideoController extends GenericApiController
 
                 // Requested only JSON info
                 if ('json' === $format) {
+                    // IPhoto object for the live video
                     return new JSONResponse([
                         'fileid' => $liveFile->getId(),
+                        'etag' => $liveFile->getEtag(),
+                        'basename' => $liveFile->getName(),
+                        'mimetype' => $liveFile->getMimeType(),
                     ]);
                 }
 
diff --git a/src/components/Metadata.vue b/src/components/Metadata.vue
index f3de2880..ad80b235 100644
--- a/src/components/Metadata.vue
+++ b/src/components/Metadata.vue
@@ -91,7 +91,7 @@ import * as utils from '../services/utils';
 import * as dav from '../services/dav';
 import { API } from '../services/API';
 
-import type { IAlbum, IFace, IImageInfo, IPhoto } from '../types';
+import type { IAlbum, IFace, IImageInfo, IPhoto, IExif } from '../types';
 
 interface TopField {
   id?: string;
@@ -117,7 +117,7 @@ export default defineComponent({
   data: () => ({
     fileid: null as number | null,
     filename: '',
-    exif: {} as NonNullable<IImageInfo['exif']>,
+    exif: {} as IExif,
     baseInfo: {} as IImageInfo,
 
     loading: 0,
@@ -198,12 +198,12 @@ export default defineComponent({
 
     /** Title EXIF value */
     title(): string | null {
-      return this.exif['Title'] || null;
+      return this.exif.Title || null;
     },
 
     /** Description EXIF value */
     description(): string | null {
-      return this.exif['Description'] || null;
+      return this.exif.Description || null;
     },
 
     /** Date taken info */
@@ -252,7 +252,7 @@ export default defineComponent({
     dateOriginalTime(): string[] | null {
       if (!this.dateOriginal) return null;
 
-      const fields = ['OffsetTimeOriginal', 'OffsetTime', 'LocationTZID'];
+      const fields: (keyof IExif)[] = ['OffsetTimeOriginal', 'OffsetTime', 'LocationTZID'];
       const hasTz = fields.some((key) => this.exif[key]);
 
       const format = 't' + (hasTz ? ' ZZ' : '');
@@ -262,18 +262,18 @@ export default defineComponent({
 
     /** Camera make and model info */
     camera(): string | null {
-      const make = this.exif['Make'];
-      const model = this.exif['Model'];
+      const make = this.exif.Make;
+      const model = this.exif.Model;
       if (!make || !model) return null;
       if (model.startsWith(make)) return model;
       return `${make} ${model}`;
     },
 
     cameraSub(): string[] {
-      const f = this.exif['FNumber'] || this.exif['Aperture'];
+      const f = this.exif.FNumber || this.exif.Aperture;
       const s = this.shutterSpeed;
-      const len = this.exif['FocalLength'];
-      const iso = this.exif['ISO'];
+      const len = this.exif.FocalLength;
+      const iso = this.exif.ISO;
 
       const parts: string[] = [];
       if (f) parts.push(`f/${f}`);
@@ -285,7 +285,7 @@ export default defineComponent({
 
     /** Convert shutter speed decimal to 1/x format */
     shutterSpeed(): string | null {
-      const speed = Number(this.exif['ShutterSpeedValue'] || this.exif['ShutterSpeed'] || this.exif['ExposureTime']);
+      const speed = Number(this.exif.ShutterSpeedValue || this.exif.ShutterSpeed || this.exif.ExposureTime);
       if (!speed) return null;
 
       if (speed < 1) {
@@ -311,7 +311,7 @@ export default defineComponent({
 
     imageInfoSub(): string[] {
       let parts: string[] = [];
-      let mp = Number(this.exif['Megapixels']);
+      let mp = Number(this.exif.Megapixels);
 
       if (this.baseInfo.w && this.baseInfo.h) {
         parts.push(`${this.baseInfo.w}x${this.baseInfo.h}`);
@@ -341,11 +341,11 @@ export default defineComponent({
     },
 
     lat(): number {
-      return Number(this.exif['GPSLatitude']);
+      return Number(this.exif.GPSLatitude);
     },
 
     lon(): number {
-      return Number(this.exif['GPSLongitude']);
+      return Number(this.exif.GPSLongitude);
     },
 
     tagNames(): string[] {
@@ -452,7 +452,7 @@ export default defineComponent({
       }
     },
 
-    handleFileUpdated({ fileid }: { fileid: number }) {
+    handleFileUpdated({ fileid }: utils.BusEvent['files:file:updated']) {
       if (fileid && this.fileid === fileid) {
         this.refresh();
       }
diff --git a/src/components/MobileHeader.vue b/src/components/MobileHeader.vue
index ef2199d6..a33ce673 100644
--- a/src/components/MobileHeader.vue
+++ b/src/components/MobileHeader.vue
@@ -44,7 +44,7 @@ export default defineComponent({
   },
 
   methods: {
-    onScroll({ current, previous }: { current: number; previous: number }) {
+    onScroll({ current, previous }: utils.BusEvent['memories.recycler.scroll']) {
       this.isScrollDown = (this.isScrollDown && previous - current < 40) || current - previous > 40; // momentum scroll
     },
   },
diff --git a/src/components/ScrollerManager.vue b/src/components/ScrollerManager.vue
index 8a192ba1..33b60674 100644
--- a/src/components/ScrollerManager.vue
+++ b/src/components/ScrollerManager.vue
@@ -476,7 +476,7 @@ export default defineComponent({
     },
 
     /** Handle mouse leave */
-    mouseleave() {
+    mouseleave(event: MouseEvent) {
       this.interactend();
       this.moveHoverCursor(this.cursorY);
     },
@@ -539,7 +539,7 @@ export default defineComponent({
     },
 
     /** Handle touch */
-    touchmove(event: any) {
+    touchmove(event: TouchEvent) {
       if (!this.scrollerRect) return;
       let y = event.targetTouches[0].pageY - this.scrollerRect.top;
       y = Math.max(this.topPadding, y + MOBILE_CURSOR_HH); // middle of touch finger
diff --git a/src/components/frame/XImgWorker.ts b/src/components/frame/XImgWorker.ts
index 5d9429eb..ed2db2d8 100644
--- a/src/components/frame/XImgWorker.ts
+++ b/src/components/frame/XImgWorker.ts
@@ -21,7 +21,7 @@ const pendingUrls = new Map<string, BlobCallback[]>();
 
 // Cache for preview images
 const cacheName = 'memories-images';
-let imageCache: Cache;
+let imageCache: Cache | undefined;
 (async function openCache() {
   try {
     imageCache = await self.caches?.open(cacheName);
diff --git a/src/components/modal/AlbumsList.vue b/src/components/modal/AlbumsList.vue
index 7d2cf8b8..0140c8e1 100644
--- a/src/components/modal/AlbumsList.vue
+++ b/src/components/modal/AlbumsList.vue
@@ -11,7 +11,7 @@
       @click="click($event, album)"
     >
       <template #icon>
-        <XImg v-if="album.last_added_photo !== -1" class="album__image" :src="toCoverUrl(album.last_added_photo)" />
+        <XImg v-if="album.last_added_photo !== -1" class="album__image" :src="toCoverUrl(album)" />
         <div v-else class="album__image album__image--placeholder">
           <ImageMultipleIcon :size="32" />
         </div>
@@ -81,10 +81,10 @@ export default defineComponent({
       };
     },
 
-    toCoverUrl(fileId: string | number) {
+    toCoverUrl(album: IAlbum) {
       return getPreviewUrl({
         photo: {
-          fileid: Number(fileId),
+          fileid: Number(album.last_added_photo),
         } as IPhoto,
         sqsize: 256,
       });
diff --git a/src/components/modal/NodeShareModal.vue b/src/components/modal/NodeShareModal.vue
index c27b7753..7aab2583 100644
--- a/src/components/modal/NodeShareModal.vue
+++ b/src/components/modal/NodeShareModal.vue
@@ -115,7 +115,7 @@ export default defineComponent({
     },
 
     isMobile(): boolean {
-      return globalThis.windowInnerWidth <= 768;
+      return utils.isMobile();
     },
   },
 
@@ -231,7 +231,7 @@ export default defineComponent({
     },
 
     refreshSidebar() {
-      if (this.isMobile) return;
+      if (utils.isMobile()) return;
       globalThis.mSidebar.close();
       globalThis.mSidebar.open(0, this.filename, true);
     },
diff --git a/src/components/top-matter/AlbumTopMatter.vue b/src/components/top-matter/AlbumTopMatter.vue
index baabd9d1..dfa97f9d 100644
--- a/src/components/top-matter/AlbumTopMatter.vue
+++ b/src/components/top-matter/AlbumTopMatter.vue
@@ -149,7 +149,7 @@ export default defineComponent({
 
   computed: {
     isAlbumList(): boolean {
-      return !Boolean(this.$route.params.name);
+      return !this.$route.params.name;
     },
 
     canEditAlbum(): boolean {
@@ -158,7 +158,7 @@ export default defineComponent({
 
     name(): string {
       // Album name is displayed in the dynamic top matter (timeline)
-      return this.$route.params.name ? '' : this.t('memories', 'Albums');
+      return this.isAlbumList ? this.t('memories', 'Albums') : String();
     },
 
     isMobile(): boolean {
diff --git a/src/components/top-matter/PublicShareHeader.ts b/src/components/top-matter/PublicShareHeader.ts
index 5056734e..5a0a3591 100644
--- a/src/components/top-matter/PublicShareHeader.ts
+++ b/src/components/top-matter/PublicShareHeader.ts
@@ -10,7 +10,7 @@ if (title) {
   let isHidden = false; // cache state to avoid unnecessary DOM updates
 
   // Hide header when recycler is scrolled down
-  utils.bus.on('memories.recycler.scroll', ({ dynTopMatterVisible }: { dynTopMatterVisible: boolean }) => {
+  utils.bus.on('memories.recycler.scroll', ({ dynTopMatterVisible }) => {
     if (dynTopMatterVisible === isHidden) return;
     header.classList.toggle('hidden', (isHidden = dynTopMatterVisible));
   });
diff --git a/src/components/top-matter/TopMatter.vue b/src/components/top-matter/TopMatter.vue
index f01df2a4..da89d7b6 100644
--- a/src/components/top-matter/TopMatter.vue
+++ b/src/components/top-matter/TopMatter.vue
@@ -61,7 +61,7 @@ export default defineComponent({
   },
 
   methods: {
-    onRecyclerScroll({ dynTopMatterVisible }: { dynTopMatterVisible: boolean }) {
+    onRecyclerScroll({ dynTopMatterVisible }: utils.BusEvent['memories.recycler.scroll']) {
       this.dynamicVisible = dynTopMatterVisible;
     },
   },
diff --git a/src/components/viewer/PsVideo.ts b/src/components/viewer/PsVideo.ts
index 391d9733..79e9d7cd 100644
--- a/src/components/viewer/PsVideo.ts
+++ b/src/components/viewer/PsVideo.ts
@@ -163,7 +163,7 @@ class VideoContentSetup {
     // Create video element
     content.videoElement = document.createElement('video');
     content.videoElement.className = 'video-js';
-    content.videoElement.setAttribute('poster', content.data.msrc);
+    content.videoElement.setAttribute('poster', content.data.msrc!);
     content.videoElement.setAttribute('preload', 'none');
     content.videoElement.setAttribute('controls', '');
     content.videoElement.setAttribute('playsinline', '');
diff --git a/src/components/viewer/Viewer.vue b/src/components/viewer/Viewer.vue
index ed8f3bd6..789fb2e5 100644
--- a/src/components/viewer/Viewer.vue
+++ b/src/components/viewer/Viewer.vue
@@ -468,9 +468,8 @@ export default defineComponent({
         arrowNextTitle: this.t('memories', 'Next'),
         getViewportSizeFn: () => {
           // Ignore the sidebar if mobile or fullscreen
-          const isMobile = globalThis.windowInnerWidth < 768;
           const isFullscreen = Boolean(document.fullscreenElement);
-          const use = this.sidebarOpen && !isMobile && !isFullscreen;
+          const use = this.sidebarOpen && !utils.isMobile() && !isFullscreen;
 
           // Calculate the sidebar width to use and outer width
           const sidebarWidth = use ? globalThis.mSidebar.getWidth() : 0;
@@ -780,7 +779,7 @@ export default defineComponent({
     },
 
     /** Get base data object */
-    getItemData(photo: IPhoto) {
+    getItemData(photo: IPhoto): PsContent['data'] {
       let previewUrl = utils.getPreviewUrl({ photo, size: 'screen' });
       const isvideo = photo.flag & this.c.FLAG_IS_VIDEO;
 
diff --git a/src/components/viewer/types.ts b/src/components/viewer/types.ts
index 7a910563..29dacd1a 100644
--- a/src/components/viewer/types.ts
+++ b/src/components/viewer/types.ts
@@ -4,9 +4,16 @@ import { IPhoto } from '../../types';
 
 type PsAugment = {
   data: _SlideData & {
+    /** The original source of the image.*/
     src: string;
-    msrc: string;
+    /** The original photo object. */
     photo: IPhoto;
+    /** The source of the high resolution image. */
+    highSrc: string | null;
+    /** The condition for loading the high resolution image. */
+    highSrcCond: 'always' | 'zoom' | 'never';
+    /** The type of content. */
+    type: 'image' | 'video';
   };
 };
 export type PsSlide = Slide &
diff --git a/src/mixins/UserConfig.ts b/src/mixins/UserConfig.ts
index 4c2fe1b0..a3d8545c 100644
--- a/src/mixins/UserConfig.ts
+++ b/src/mixins/UserConfig.ts
@@ -8,7 +8,7 @@ import * as utils from '../services/utils';
 import { IConfig } from '../types';
 import staticConfig from '../services/static-config';
 
-const eventName = 'memories:user-config-changed';
+const eventName: keyof utils.BusEvent = 'memories:user-config-changed';
 
 const localSettings: (keyof IConfig)[] = [
   'square_thumbs',
diff --git a/src/services/dav/base.ts b/src/services/dav/base.ts
index b1927fdf..cd277d1b 100644
--- a/src/services/dav/base.ts
+++ b/src/services/dav/base.ts
@@ -231,13 +231,9 @@ async function extendWithLivePhotos(photos: IPhoto[]) {
       photos
         .filter((p) => p.liveid && !p.liveid.startsWith('self__'))
         .map(async (p) => {
-          const url = API.Q(utils.getLivePhotoVideoUrl(p, false), { format: 'json' });
           try {
-            const response = await axios.get(url);
-            const data = response.data;
-            return {
-              fileid: data.fileid,
-            } as IPhoto;
+            const url = API.Q(utils.getLivePhotoVideoUrl(p, false), { format: 'json' });
+            return (await axios.get<IPhoto>(url)).data;
           } catch (error) {
             console.error(error);
             return null;
diff --git a/src/services/dav/tags.ts b/src/services/dav/tags.ts
index 1706d6a7..9c82189c 100644
--- a/src/services/dav/tags.ts
+++ b/src/services/dav/tags.ts
@@ -67,8 +67,8 @@ function parseIdFromLocation(url: string): number {
     url = url.substring(0, queryPos);
   }
 
-  const parts = url.split('/');
-  let result;
+  const parts: string[] = url.split('/');
+  let result: string | undefined;
   do {
     result = parts[parts.length - 1];
     parts.pop();
diff --git a/src/services/utils/algo.ts b/src/services/utils/algo.ts
index 275c64d6..ea24fcb8 100644
--- a/src/services/utils/algo.ts
+++ b/src/services/utils/algo.ts
@@ -66,11 +66,11 @@ export function randomChoice<T>(arr: T[]): T {
  */
 export function randomSubarray<T>(arr: T[], size: number): T[] {
   if (arr.length <= size) return arr;
-  var shuffled = arr.slice(0),
-    i = arr.length,
-    min = i - size,
-    temp,
-    index;
+  let shuffled: T[] = arr.slice(0),
+    i: number = arr.length,
+    min: number = i - size,
+    temp: T,
+    index: number;
   while (i-- > min) {
     index = Math.floor((i + 1) * Math.random());
     temp = shuffled[index];
diff --git a/src/services/utils/date.ts b/src/services/utils/date.ts
index ceb0a34a..e5429a4a 100644
--- a/src/services/utils/date.ts
+++ b/src/services/utils/date.ts
@@ -17,7 +17,7 @@ export function dateToDayId(date: Date) {
 }
 
 /** Get month name from number */
-export function getShortDateStr(date: Date) {
+export function getShortDateStr(date: Date): string {
   const dayId = dateToDayId(date);
   if (!shortDateStrMemo.has(dayId)) {
     shortDateStrMemo.set(
@@ -29,7 +29,7 @@ export function getShortDateStr(date: Date) {
       })
     );
   }
-  return shortDateStrMemo.get(dayId);
+  return shortDateStrMemo.get(dayId)!;
 }
 
 /** Get long date string with optional year if same as current */
diff --git a/src/services/utils/event-bus.ts b/src/services/utils/event-bus.ts
index 05622fed..dabea5e6 100644
--- a/src/services/utils/event-bus.ts
+++ b/src/services/utils/event-bus.ts
@@ -1,7 +1,7 @@
 import { emit, subscribe, unsubscribe } from '@nextcloud/event-bus';
 import { IConfig, IPhoto } from '../../types';
 
-type BusEvent = {
+export type BusEvent = {
   /** Open/close the navigation drawer */
   'toggle-navigation': { open: boolean };
   /** File was created */
@@ -26,7 +26,10 @@ type BusEvent = {
     value: IConfig[keyof IConfig];
   } | null;
 
-  /** Delete these photos from the timeline */
+  /**
+   * Remove these photos from the timeline.
+   * Each photo object is required to have the `d` (day) property.
+   */
   'memories:timeline:deleted': IPhoto[];
   /** Viewer has requested fetching day */
   'memories:timeline:fetch-day': number;
@@ -46,17 +49,32 @@ type BusEvent = {
 };
 
 /**
- * Emit an event on the Nextcloud event bus.
- * @param name Name of event
- * @param data arguments
+ * Wrapper around Nextcloud's event bus.
  */
 export const bus = {
+  /**
+   * Emit an event on the Nextcloud event bus.
+   * @param name Name of event
+   * @param data arguments
+   */
   emit<T extends keyof BusEvent>(name: T, data: BusEvent[T]): void {
     emit(name, data as any);
   },
+
+  /**
+   * Subscribe to an event on the Nextcloud event bus.
+   * @param name Name of event
+   * @param callback Callback to be called when the event is emitted
+   */
   on<T extends keyof BusEvent>(name: T, callback: (data: BusEvent[T]) => void): void {
     subscribe(name, callback);
   },
+
+  /**
+   * Unsubscribe from an event on the Nextcloud event bus.
+   * @param name Name of event
+   * @param callback Same callback that was passed to `on`
+   */
   off<T extends keyof BusEvent>(name: T, callback: (data: BusEvent[T]) => void): void {
     unsubscribe(name, callback);
   },
diff --git a/src/types.ts b/src/types.ts
index 140e0b02..01e4d25a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -106,24 +106,7 @@ export interface IImageInfo {
   address?: string;
   tags?: { [id: string]: string };
 
-  exif?: {
-    Rotation?: number;
-    Orientation?: number;
-    ImageWidth?: number;
-    ImageHeight?: number;
-
-    Title?: string;
-    Description?: string;
-    Make?: string;
-    Model?: string;
-
-    DateTimeEpoch?: number;
-    OffsetTimeOriginal?: string;
-    OffsetTime?: string;
-    LocationTZID?: string;
-
-    [other: string]: unknown;
-  };
+  exif?: IExif;
 
   clusters?: {
     albums?: IAlbum[];
@@ -132,6 +115,37 @@ export interface IImageInfo {
   };
 }
 
+export interface IExif {
+  Rotation?: number;
+  Orientation?: number;
+  ImageWidth?: number;
+  ImageHeight?: number;
+  Megapixels?: number;
+
+  Title?: string;
+  Description?: string;
+  Make?: string;
+  Model?: string;
+
+  DateTimeEpoch?: number;
+  OffsetTimeOriginal?: string;
+  OffsetTime?: string;
+  LocationTZID?: string;
+
+  ExposureTime?: number;
+  ShutterSpeed?: number;
+  ShutterSpeedValue?: number;
+  Aperture?: number;
+  ApertureValue?: number;
+  ISO?: number;
+  FNumber?: number;
+  FocalLength?: number;
+
+  GPSAltitude?: number;
+  GPSLatitude?: number;
+  GPSLongitude?: number;
+}
+
 export interface IFolder extends IPhoto {
   /** Path to folder */
   path: string;