Fix React contexts (#12855)

src/components/structures/EmbeddedPage.tsx

@@ -45,10 +45,11 @@ interface IState {
 
 export default class EmbeddedPage extends React.PureComponent<IProps, IState> {
     public static contextType = MatrixClientContext;
+    public context!: React.ContextType<typeof MatrixClientContext>;
     private unmounted = false;
     private dispatcherRef: string | null = null;
 
-    public constructor(props: IProps, context: typeof MatrixClientContext) {
+    public constructor(props: IProps, context: React.ContextType<typeof MatrixClientContext>) {
         super(props, context);
 
         this.state = {

src/components/structures/FilePanel.tsx

@@ -59,6 +59,7 @@ interface IState {
  */
 class FilePanel extends React.Component<IProps, IState> {
     public static contextType = RoomContext;
+    public context!: React.ContextType<typeof RoomContext>;
 
     // This is used to track if a decrypted event was a live event and should be
     // added to the timeline.

src/components/structures/NotificationPanel.tsx

@@ -42,11 +42,12 @@ interface IState {
  */
 export default class NotificationPanel extends React.PureComponent<IProps, IState> {
     public static contextType = RoomContext;
+    public context!: React.ContextType<typeof RoomContext>;
 
     private card = React.createRef<HTMLDivElement>();
 
-    public constructor(props: IProps) {
-        super(props);
+    public constructor(props: IProps, context: React.ContextType<typeof RoomContext>) {
+        super(props, context);
 
         this.state = {
             narrow: false,

src/components/structures/RoomStatusBar.tsx

@@ -15,7 +15,16 @@ limitations under the License.
 */
 
 import React, { ReactNode } from "react";
-import { EventStatus, MatrixEvent, Room, MatrixError, SyncState, SyncStateData } from "matrix-js-sdk/src/matrix";
+import {
+    ClientEvent,
+    EventStatus,
+    MatrixError,
+    MatrixEvent,
+    Room,
+    RoomEvent,
+    SyncState,
+    SyncStateData,
+} from "matrix-js-sdk/src/matrix";
 
 import { Icon as WarningIcon } from "../../../res/img/feather-customised/warning-triangle.svg";
 import { _t, _td } from "../../languageHandler";
@@ -79,8 +88,8 @@ interface IProps {
 }
 
 interface IState {
-    syncState: SyncState;
-    syncStateData: SyncStateData;
+    syncState: SyncState | null;
+    syncStateData: SyncStateData | null;
     unsentMessages: MatrixEvent[];
     isResending: boolean;
 }
@@ -88,9 +97,11 @@ interface IState {
 export default class RoomStatusBar extends React.PureComponent<IProps, IState> {
     private unmounted = false;
     public static contextType = MatrixClientContext;
+    public context!: React.ContextType<typeof MatrixClientContext>;
 
-    public constructor(props: IProps, context: typeof MatrixClientContext) {
+    public constructor(props: IProps, context: React.ContextType<typeof MatrixClientContext>) {
         super(props, context);
+        this.context = context; // XXX: workaround for lack of `declare` support on `public context!:` definition
 
         this.state = {
             syncState: this.context.getSyncState(),
@@ -102,8 +113,8 @@ export default class RoomStatusBar extends React.PureComponent<IProps, IState> {
 
     public componentDidMount(): void {
         const client = this.context;
-        client.on("sync", this.onSyncStateChange);
-        client.on("Room.localEchoUpdated", this.onRoomLocalEchoUpdated);
+        client.on(ClientEvent.Sync, this.onSyncStateChange);
+        client.on(RoomEvent.LocalEchoUpdated, this.onRoomLocalEchoUpdated);
 
         this.checkSize();
     }
@@ -117,19 +128,19 @@ export default class RoomStatusBar extends React.PureComponent<IProps, IState> {
         // we may have entirely lost our client as we're logging out before clicking login on the guest bar...
         const client = this.context;
         if (client) {
-            client.removeListener("sync", this.onSyncStateChange);
-            client.removeListener("Room.localEchoUpdated", this.onRoomLocalEchoUpdated);
+            client.removeListener(ClientEvent.Sync, this.onSyncStateChange);
+            client.removeListener(RoomEvent.LocalEchoUpdated, this.onRoomLocalEchoUpdated);
         }
     }
 
-    private onSyncStateChange = (state: SyncState, prevState: SyncState, data: SyncStateData): void => {
+    private onSyncStateChange = (state: SyncState, prevState: SyncState | null, data?: SyncStateData): void => {
         if (state === "SYNCING" && prevState === "SYNCING") {
             return;
         }
         if (this.unmounted) return;
         this.setState({
             syncState: state,
-            syncStateData: data,
+            syncStateData: data ?? null,
         });
     };
 

src/components/structures/ThreadView.tsx

@@ -93,8 +93,8 @@ export default class ThreadView extends React.Component<IProps, IState> {
     // Set by setEventId in ctor.
     private eventId!: string;
 
-    public constructor(props: IProps) {
-        super(props);
+    public constructor(props: IProps, context: React.ContextType<typeof RoomContext>) {
+        super(props, context);
 
         this.setEventId(this.props.mxEvent);
         const thread = this.props.room.getThread(this.eventId) ?? undefined;

src/components/structures/UserView.tsx

@@ -43,8 +43,8 @@ export default class UserView extends React.Component<IProps, IState> {
     public static contextType = MatrixClientContext;
     public context!: React.ContextType<typeof MatrixClientContext>;
 
-    public constructor(props: IProps) {
-        super(props);
+    public constructor(props: IProps, context: React.ContextType<typeof MatrixClientContext>) {
+        super(props, context);
         this.state = {
             loading: true,
         };