diff --git a/react/features/base/app/components/BaseApp.tsx b/react/features/base/app/components/BaseApp.tsx
index 35b2c0145c..e26107b921 100644
--- a/react/features/base/app/components/BaseApp.tsx
+++ b/react/features/base/app/components/BaseApp.tsx
@@ -250,7 +250,7 @@ export default class BaseApp
extends Component
{
* @returns {Promise}
*/
_navigate(route: {
- component?: ComponentType;
+ component?: ComponentType;
href?: string;
props?: Object;
}): Promise {
diff --git a/react/features/base/avatar/components/Avatar.tsx b/react/features/base/avatar/components/Avatar.tsx
index 3cff264a29..e684026cd5 100644
--- a/react/features/base/avatar/components/Avatar.tsx
+++ b/react/features/base/avatar/components/Avatar.tsx
@@ -71,7 +71,7 @@ export interface IProps {
/**
* The size of the avatar.
*/
- size: number;
+ size?: number;
/**
* One of the expected status strings (e.g. 'available') to render a badge on the avatar, if necessary.
diff --git a/react/features/calendar-sync/components/UpdateCalendarEventDialog.web.js b/react/features/calendar-sync/components/UpdateCalendarEventDialog.web.ts
similarity index 100%
rename from react/features/calendar-sync/components/UpdateCalendarEventDialog.web.js
rename to react/features/calendar-sync/components/UpdateCalendarEventDialog.web.ts
diff --git a/react/features/chat/components/AbstractChat.ts b/react/features/chat/components/AbstractChat.ts
index 98b9cfb56e..ec6b6e5103 100644
--- a/react/features/chat/components/AbstractChat.ts
+++ b/react/features/chat/components/AbstractChat.ts
@@ -5,6 +5,7 @@ import { IReduxState, IStore } from '../../app/types';
import { getLocalParticipant } from '../../base/participants/functions';
import { sendMessage, setIsPollsTabFocused } from '../actions';
import { SMALL_WIDTH_THRESHOLD } from '../constants';
+import { IMessage } from '../reducer';
/**
* The type of the React {@code Component} props of {@code AbstractChat}.
@@ -34,7 +35,7 @@ export interface IProps extends WithTranslation {
/**
* All the chat messages in the conference.
*/
- _messages: Array