diff --git a/app/soapbox/actions/modals.ts b/app/soapbox/actions/modals.ts
index 3e1a106cf9..00d4fd01a4 100644
--- a/app/soapbox/actions/modals.ts
+++ b/app/soapbox/actions/modals.ts
@@ -1,8 +1,10 @@
+import type { ModalType } from 'soapbox/features/ui/components/modal_root';
+
 export const MODAL_OPEN  = 'MODAL_OPEN';
 export const MODAL_CLOSE = 'MODAL_CLOSE';
 
 /** Open a modal of the given type */
-export function openModal(type: string, props?: any) {
+export function openModal(type: ModalType, props?: any) {
   return {
     type: MODAL_OPEN,
     modalType: type,
@@ -11,7 +13,7 @@ export function openModal(type: string, props?: any) {
 }
 
 /** Close the modal */
-export function closeModal(type?: string) {
+export function closeModal(type?: ModalType) {
   return {
     type: MODAL_CLOSE,
     modalType: type,
diff --git a/app/soapbox/actions/notifications.ts b/app/soapbox/actions/notifications.ts
index db8fd688f0..8ef0e57156 100644
--- a/app/soapbox/actions/notifications.ts
+++ b/app/soapbox/actions/notifications.ts
@@ -1,6 +1,3 @@
-import {
-  Map as ImmutableMap,
-} from 'immutable';
 import IntlMessageFormat from 'intl-messageformat';
 import 'intl-pluralrules';
 import { defineMessages } from 'react-intl';
@@ -149,13 +146,13 @@ const updateNotificationsQueue = (notification: APIEntity, intlMessages: Record<
 
 const dequeueNotifications = () =>
   (dispatch: AppDispatch, getState: () => RootState) => {
-    const queuedNotifications = getState().notifications.get('queuedNotifications');
-    const totalQueuedNotificationsCount = getState().notifications.get('totalQueuedNotificationsCount');
+    const queuedNotifications = getState().notifications.queuedNotifications;
+    const totalQueuedNotificationsCount = getState().notifications.totalQueuedNotificationsCount;
 
     if (totalQueuedNotificationsCount === 0) {
       return;
     } else if (totalQueuedNotificationsCount > 0 && totalQueuedNotificationsCount <= MAX_QUEUED_NOTIFICATIONS) {
-      queuedNotifications.forEach((block: APIEntity) => {
+      queuedNotifications.forEach((block) => {
         dispatch(updateNotifications(block.notification));
       });
     } else {
@@ -184,7 +181,7 @@ const expandNotifications = ({ maxId }: Record<string, any> = {}, done: () => an
     const notifications = state.notifications;
     const isLoadingMore = !!maxId;
 
-    if (notifications.get('isLoading')) {
+    if (notifications.isLoading) {
       done();
       return dispatch(noOp);
     }
@@ -207,7 +204,7 @@ const expandNotifications = ({ maxId }: Record<string, any> = {}, done: () => an
       }
     }
 
-    if (!maxId && notifications.get('items').size > 0) {
+    if (!maxId && notifications.items.size > 0) {
       params.since_id = notifications.getIn(['items', 0, 'id']);
     }
 
@@ -306,8 +303,8 @@ const markReadNotifications = () =>
     if (!isLoggedIn(getState)) return;
 
     const state = getState();
-    const topNotificationId: string | undefined = state.notifications.get('items').first(ImmutableMap()).get('id');
-    const lastReadId: string | -1 = state.notifications.get('lastRead');
+    const topNotificationId = state.notifications.items.first()?.id;
+    const lastReadId = state.notifications.lastRead;
     const v = parseVersion(state.instance.version);
 
     if (topNotificationId && (lastReadId === -1 || compareId(topNotificationId, lastReadId) > 0)) {
diff --git a/app/soapbox/components/extended_video_player.js b/app/soapbox/components/extended_video_player.js
deleted file mode 100644
index 59a6b938e5..0000000000
Binary files a/app/soapbox/components/extended_video_player.js and /dev/null differ
diff --git a/app/soapbox/components/extended_video_player.tsx b/app/soapbox/components/extended_video_player.tsx
new file mode 100644
index 0000000000..99a0af01c4
--- /dev/null
+++ b/app/soapbox/components/extended_video_player.tsx
@@ -0,0 +1,64 @@
+import React, { useEffect, useRef } from 'react';
+
+import { isIOS } from 'soapbox/is_mobile';
+
+interface IExtendedVideoPlayer {
+  src: string,
+  alt?: string,
+  width?: number,
+  height?: number,
+  time?: number,
+  controls?: boolean,
+  muted?: boolean,
+  onClick?: () =>  void,
+}
+
+const ExtendedVideoPlayer: React.FC<IExtendedVideoPlayer> = ({ src, alt, time, controls, muted, onClick }) => {
+  const video = useRef<HTMLVideoElement>(null);
+
+  useEffect(() => {
+    const handleLoadedData = () => {
+      if (time) {
+        video.current!.currentTime = time;
+      }
+    };
+
+    video.current?.addEventListener('loadeddata', handleLoadedData);
+
+    return () => {
+      video.current?.removeEventListener('loadeddata', handleLoadedData);
+    };
+  }, [video.current]);
+
+  const handleClick: React.MouseEventHandler<HTMLVideoElement> = e => {
+    e.stopPropagation();
+    const handler = onClick;
+    if (handler) handler();
+  };
+
+  const conditionalAttributes: React.VideoHTMLAttributes<HTMLVideoElement> = {};
+  if (isIOS()) {
+    conditionalAttributes.playsInline = true;
+  }
+
+  return (
+    <div className='extended-video-player'>
+      <video
+        ref={video}
+        src={src}
+        autoPlay
+        role='button'
+        tabIndex={0}
+        aria-label={alt}
+        title={alt}
+        muted={muted}
+        controls={controls}
+        loop={!controls}
+        onClick={handleClick}
+        {...conditionalAttributes}
+      />
+    </div>
+  );
+};
+
+export default ExtendedVideoPlayer;
diff --git a/app/soapbox/components/modal_root.tsx b/app/soapbox/components/modal_root.tsx
index f34597d5b5..d17be3efc4 100644
--- a/app/soapbox/components/modal_root.tsx
+++ b/app/soapbox/components/modal_root.tsx
@@ -9,6 +9,7 @@ import { openModal, closeModal } from 'soapbox/actions/modals';
 import { useAppDispatch, useAppSelector, usePrevious } from 'soapbox/hooks';
 
 import type { UnregisterCallback } from 'history';
+import type { ModalType } from 'soapbox/features/ui/components/modal_root';
 import type { ReducerCompose } from 'soapbox/reducers/compose';
 
 const messages = defineMessages({
@@ -26,8 +27,8 @@ export const checkComposeContent = (compose?: ReturnType<typeof ReducerCompose>)
 
 interface IModalRoot {
   onCancel?: () => void,
-  onClose: (type?: string) => void,
-  type: string,
+  onClose: (type?: ModalType) => void,
+  type: ModalType,
 }
 
 const ModalRoot: React.FC<IModalRoot> = ({ children, onCancel, onClose, type }) => {
diff --git a/app/soapbox/components/sidebar-navigation.tsx b/app/soapbox/components/sidebar-navigation.tsx
index 583006070d..22ad8dfc98 100644
--- a/app/soapbox/components/sidebar-navigation.tsx
+++ b/app/soapbox/components/sidebar-navigation.tsx
@@ -28,7 +28,7 @@ const SidebarNavigation = () => {
   const instance = useAppSelector((state) => state.instance);
   const settings = useAppSelector((state) => getSettings(state));
   const account = useOwnAccount();
-  const notificationCount = useAppSelector((state) => state.notifications.get('unread'));
+  const notificationCount = useAppSelector((state) => state.notifications.unread);
   const chatsCount = useAppSelector((state) => state.chats.items.reduce((acc, curr) => acc + Math.min(curr.unread || 0, 1), 0));
   const followRequestsCount = useAppSelector((state) => state.user_lists.follow_requests.items.count());
   const dashboardCount = useAppSelector((state) => state.admin.openReports.count() + state.admin.awaitingApproval.count());
diff --git a/app/soapbox/features/notifications/components/__tests__/notification.test.tsx b/app/soapbox/features/notifications/components/__tests__/notification.test.tsx
index 9c86474b7b..b9c5df6414 100644
--- a/app/soapbox/features/notifications/components/__tests__/notification.test.tsx
+++ b/app/soapbox/features/notifications/components/__tests__/notification.test.tsx
@@ -13,7 +13,7 @@ const normalize = (notification: any) => {
 
   return {
     // @ts-ignore
-    notification: state.notifications.items.get(notification.id),
+    notification: state.notifications.items.get(notification.id)!,
     state,
   };
 };
diff --git a/app/soapbox/features/placeholder/components/placeholder_media_gallery.js b/app/soapbox/features/placeholder/components/placeholder_media_gallery.js
deleted file mode 100644
index c1b2dd3b9d..0000000000
Binary files a/app/soapbox/features/placeholder/components/placeholder_media_gallery.js and /dev/null differ
diff --git a/app/soapbox/features/placeholder/components/placeholder_media_gallery.tsx b/app/soapbox/features/placeholder/components/placeholder_media_gallery.tsx
new file mode 100644
index 0000000000..3eab10e4d0
--- /dev/null
+++ b/app/soapbox/features/placeholder/components/placeholder_media_gallery.tsx
@@ -0,0 +1,93 @@
+import { List as ImmutableList, Record as ImmutableRecord } from 'immutable';
+import React, { useState } from 'react';
+
+import type { Attachment as AttachmentEntity } from 'soapbox/types/entities';
+
+interface IPlaceholderMediaGallery {
+  media: ImmutableList<AttachmentEntity>;
+  defaultWidth?: number;
+}
+
+const SizeData = ImmutableRecord({
+  style: {} as React.CSSProperties,
+  itemsDimensions: [] as Record<string, string>[],
+  size: 1 as number,
+  width: 0 as number,
+});
+
+const PlaceholderMediaGallery: React.FC<IPlaceholderMediaGallery> = ({ media, defaultWidth }) => {
+  const [width, setWidth] = useState(defaultWidth);
+
+  const handleRef = (node: HTMLDivElement) => {
+    if (node) {
+      setWidth(node.offsetWidth);
+    }
+  };
+
+  const getSizeData = (size: number) => {
+    const style: React.CSSProperties = {};
+    let itemsDimensions: Record<string, string>[] = [];
+
+    if (size === 1) {
+      style.height = width! * 9 / 16;
+
+      itemsDimensions = [
+        { w: '100%', h: '100%' },
+      ];
+    } else if (size === 2) {
+      style.height = width! / 2;
+
+      itemsDimensions = [
+        { w: '50%', h: '100%', r: '2px' },
+        { w: '50%', h: '100%', l: '2px' },
+      ];
+    } else if (size === 3) {
+      style.height = width;
+
+      itemsDimensions = [
+        { w: '50%', h: '50%', b: '2px', r: '2px' },
+        { w: '50%', h: '50%', b: '2px', l: '2px' },
+        { w: '100%', h: '50%', t: '2px' },
+      ];
+    } else if (size >= 4) {
+      style.height = width;
+
+      itemsDimensions = [
+        { w: '50%', h: '50%', b: '2px', r: '2px' },
+        { w: '50%', h: '50%', b: '2px', l: '2px' },
+        { w: '50%', h: '50%', t: '2px', r: '2px' },
+        { w: '50%', h: '50%', t: '2px', l: '2px' },
+      ];
+    }
+
+    return SizeData({
+      style,
+      itemsDimensions,
+      size,
+      width,
+    });
+  };
+
+  const renderItem = (dimensions: Record<string, string>, i: number) => {
+    const width = dimensions.w;
+    const height = dimensions.h;
+    const top = dimensions.t || 'auto';
+    const right = dimensions.r || 'auto';
+    const bottom = dimensions.b || 'auto';
+    const left = dimensions.l || 'auto';
+    const float = dimensions.float as any || 'left';
+    const position = dimensions.pos as any || 'relative';
+
+    return <div key={i} className='media-gallery__item' style={{ position, float, left, top, right, bottom, height, width }} />;
+  };
+
+  const sizeData = getSizeData(media.size);
+
+  return (
+    <div className='media-gallery media-gallery--placeholder' style={sizeData.get('style')} ref={handleRef}>
+      {media.take(4).map((_, i) => renderItem(sizeData.get('itemsDimensions')[i], i))}
+    </div>
+  );
+};
+
+export default PlaceholderMediaGallery;
diff --git a/app/soapbox/features/placeholder/utils.js b/app/soapbox/features/placeholder/utils.ts
similarity index 68%
rename from app/soapbox/features/placeholder/utils.js
rename to app/soapbox/features/placeholder/utils.ts
index f2001a61d5..15eb4e5e52 100644
Binary files a/app/soapbox/features/placeholder/utils.js and b/app/soapbox/features/placeholder/utils.ts differ
diff --git a/app/soapbox/features/ui/components/bundle.tsx b/app/soapbox/features/ui/components/bundle.tsx
index 55f6478bca..79851b9789 100644
--- a/app/soapbox/features/ui/components/bundle.tsx
+++ b/app/soapbox/features/ui/components/bundle.tsx
@@ -3,10 +3,10 @@ import React from 'react';
 const emptyComponent = () => null;
 const noop = () => { };
 
-interface BundleProps {
+export interface BundleProps {
   fetchComponent: () => Promise<any>,
   loading: React.ComponentType,
-  error: React.ComponentType<{ onRetry: (props: BundleProps) => void }>,
+  error: React.ComponentType<{ onRetry: (props?: BundleProps) => void }>,
   children: (mod: any) => React.ReactNode,
   renderDelay?: number,
   onFetch: () => void,
@@ -57,7 +57,7 @@ class Bundle extends React.PureComponent<BundleProps, BundleState> {
     }
   }
 
-  load = (props: BundleProps) => {
+  load = (props?: BundleProps) => {
     const { fetchComponent, onFetch, onFetchSuccess, onFetchFail, renderDelay } = props || this.props;
     const cachedMod = Bundle.cache.get(fetchComponent);
 
diff --git a/app/soapbox/features/ui/components/media-modal.tsx b/app/soapbox/features/ui/components/media-modal.tsx
index 92b5ecad98..1a432de3b7 100644
--- a/app/soapbox/features/ui/components/media-modal.tsx
+++ b/app/soapbox/features/ui/components/media-modal.tsx
@@ -225,7 +225,6 @@ const MediaModal: React.FC<IMediaModal> = (props) => {
           muted
           controls={false}
           width={width}
-          link={link}
           height={height}
           key={attachment.preview_url}
           alt={attachment.description}
@@ -298,4 +297,4 @@ const MediaModal: React.FC<IMediaModal> = (props) => {
   );
 };
 
-export default MediaModal;
\ No newline at end of file
+export default MediaModal;
diff --git a/app/soapbox/features/ui/components/modal_root.js b/app/soapbox/features/ui/components/modal_root.tsx
similarity index 83%
rename from app/soapbox/features/ui/components/modal_root.js
rename to app/soapbox/features/ui/components/modal_root.tsx
index 32425cffd3..f9900d569b 100644
Binary files a/app/soapbox/features/ui/components/modal_root.js and b/app/soapbox/features/ui/components/modal_root.tsx differ
diff --git a/app/soapbox/features/ui/containers/bundle_container.tsx b/app/soapbox/features/ui/containers/bundle_container.tsx
index 12e4b37877..50a8b8629b 100644
--- a/app/soapbox/features/ui/containers/bundle_container.tsx
+++ b/app/soapbox/features/ui/containers/bundle_container.tsx
@@ -1,6 +1,7 @@
 import { connect } from 'react-redux';
 
-import { fetchBundleRequest, fetchBundleSuccess, fetchBundleFail } from '../../../actions/bundles';
+import { fetchBundleRequest, fetchBundleSuccess, fetchBundleFail } from 'soapbox/actions/bundles';
+
 import Bundle from '../components/bundle';
 
 import type { AppDispatch } from 'soapbox/store';
diff --git a/app/soapbox/features/ui/containers/modal_container.js b/app/soapbox/features/ui/containers/modal_container.ts
similarity index 65%
rename from app/soapbox/features/ui/containers/modal_container.js
rename to app/soapbox/features/ui/containers/modal_container.ts
index 54f07a371f..dc24254c39 100644
Binary files a/app/soapbox/features/ui/containers/modal_container.js and b/app/soapbox/features/ui/containers/modal_container.ts differ
diff --git a/app/soapbox/reducers/notifications.js b/app/soapbox/reducers/notifications.ts
similarity index 64%
rename from app/soapbox/reducers/notifications.js
rename to app/soapbox/reducers/notifications.ts
index 4d5dd99214..d8c27292b0 100644
Binary files a/app/soapbox/reducers/notifications.js and b/app/soapbox/reducers/notifications.ts differ