diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index f4107103..c7803415 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -1,6 +1,16 @@
 module.exports = {
   plugins: ["matrix-org"],
-  extends: ["plugin:matrix-org/react", "plugin:matrix-org/a11y", "prettier"],
+  extends: [
+    "prettier",
+    "plugin:matrix-org/react",
+    "plugin:matrix-org/a11y",
+    "plugin:matrix-org/typescript",
+  ],
+  parserOptions: {
+    ecmaVersion: 2018,
+    sourceType: "module",
+    project: ["./tsconfig.json"],
+  },
   env: {
     browser: true,
     node: true,
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index a9298638..baa3a5f0 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -19,6 +19,6 @@ jobs:
       - name: i18n
         run: "yarn run i18n:check"
       - name: ESLint
-        run: "yarn run lint:js"
+        run: "yarn run lint:eslint"
       - name: Type check
         run: "yarn run lint:types"
diff --git a/package.json b/package.json
index d70395d7..3d3d938b 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,9 @@
     "build-storybook": "build-storybook",
     "prettier:check": "prettier -c .",
     "prettier:format": "prettier -w .",
-    "lint": "yarn lint:types && yarn lint:js",
-    "lint:js": "eslint --max-warnings 0 src",
+    "lint": "yarn lint:types && yarn lint:eslint",
+    "lint:eslint": "eslint --max-warnings 0 src",
+    "lint:eslint-fix": "eslint --max-warnings 0 src --fix",
     "lint:types": "tsc",
     "i18n": "node_modules/i18next-parser/bin/cli.js",
     "i18n:check": "node_modules/i18next-parser/bin/cli.js --fail-on-warnings --fail-on-update",
@@ -46,6 +47,7 @@
     "@sentry/react": "^6.13.3",
     "@sentry/tracing": "^6.13.3",
     "@types/grecaptcha": "^3.0.4",
+    "@types/react-router-dom": "^5.3.3",
     "@types/sdp-transform": "^2.4.5",
     "@use-gesture/react": "^10.2.11",
     "@vitejs/plugin-basic-ssl": "^1.0.1",
@@ -58,7 +60,7 @@
     "i18next-http-backend": "^1.4.4",
     "livekit-client": "1.12.0",
     "lodash": "^4.17.21",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#9ba44b96202e36d8bd6fbcff3222b7c70fc371d7",
+    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#d79d9ae69c3220c02406706d4a1ec52c22c44fbd",
     "matrix-widget-api": "^1.3.1",
     "mermaid": "^8.13.8",
     "normalize.css": "^8.0.1",
@@ -70,13 +72,15 @@
     "react-dom": "18",
     "react-i18next": "^11.18.6",
     "react-json-view": "^1.21.3",
-    "react-router": "6",
     "react-router-dom": "^5.2.0",
     "react-use-clipboard": "^1.0.7",
     "react-use-measure": "^2.1.1",
     "sdp-transform": "^2.14.1",
     "tinyqueue": "^2.0.3",
-    "unique-names-generator": "^4.6.0"
+    "unique-names-generator": "^4.6.0",
+    "uuid": "9",
+    "@types/uuid": "9",
+    "@types/content-type": "^1.1.5"
   },
   "devDependencies": {
     "@babel/core": "^7.16.5",
diff --git a/src/App.tsx b/src/App.tsx
index d020655d..0ef5bcd6 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -18,6 +18,7 @@ import { Suspense, useEffect, useState } from "react";
 import { BrowserRouter as Router, Switch, Route } from "react-router-dom";
 import * as Sentry from "@sentry/react";
 import { OverlayProvider } from "@react-aria/overlays";
+import { History } from "history";
 
 import { HomePage } from "./home/HomePage";
 import { LoginPage } from "./auth/LoginPage";
@@ -51,6 +52,8 @@ export default function App({ history }: AppProps) {
   const errorPage = <CrashView />;
 
   return (
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     <Router history={history}>
       {loaded ? (
         <Suspense fallback={null}>
diff --git a/src/Avatar.tsx b/src/Avatar.tsx
index 9549cd48..c11d71d4 100644
--- a/src/Avatar.tsx
+++ b/src/Avatar.tsx
@@ -16,7 +16,6 @@ limitations under the License.
 
 import { useMemo, CSSProperties, HTMLAttributes, FC } from "react";
 import classNames from "classnames";
-import { MatrixClient } from "matrix-js-sdk/src/client";
 
 import { getAvatarUrl } from "./matrix-utils";
 import { useClient } from "./ClientContext";
@@ -59,9 +58,6 @@ function hashStringToArrIndex(str: string, arrLength: number) {
   return sum % arrLength;
 }
 
-const resolveAvatarSrc = (client: MatrixClient, src: string, size: number) =>
-  src?.startsWith("mxc://") ? client && getAvatarUrl(client, src, size) : src;
-
 interface Props extends HTMLAttributes<HTMLDivElement> {
   bgKey?: string;
   src?: string;
@@ -99,10 +95,10 @@ export const Avatar: FC<Props> = ({
     [size]
   );
 
-  const resolvedSrc = useMemo(
-    () => resolveAvatarSrc(client, src, sizePx),
-    [client, src, sizePx]
-  );
+  const resolvedSrc = useMemo(() => {
+    if (!client || !src || !sizePx) return undefined;
+    return src.startsWith("mxc://") ? getAvatarUrl(client, src, sizePx) : src;
+  }, [client, src, sizePx]);
 
   const backgroundColor = useMemo(() => {
     const index = hashStringToArrIndex(
diff --git a/src/ClientContext.tsx b/src/ClientContext.tsx
index ba1b217b..d488d6de 100644
--- a/src/ClientContext.tsx
+++ b/src/ClientContext.tsx
@@ -20,9 +20,9 @@ import {
   useEffect,
   useState,
   createContext,
-  useMemo,
   useContext,
   useRef,
+  useMemo,
 } from "react";
 import { useHistory } from "react-router-dom";
 import { MatrixClient } from "matrix-js-sdk/src/client";
@@ -31,9 +31,9 @@ import { useTranslation } from "react-i18next";
 
 import { ErrorView } from "./FullScreenView";
 import {
-  initClient,
   CryptoStoreIntegrityError,
   fallbackICEServerAllowed,
+  initClient,
 } from "./matrix-utils";
 import { widget } from "./widget";
 import {
@@ -47,184 +47,141 @@ import { Config } from "./config/Config";
 declare global {
   interface Window {
     matrixclient: MatrixClient;
-    isPasswordlessUser: boolean;
+    passwordlessUser: boolean;
   }
 }
 
-export interface Session {
-  user_id: string;
-  device_id: string;
-  access_token: string;
+export type ClientState = ValidClientState | ErrorState;
+
+export type ValidClientState = {
+  state: "valid";
+  authenticated?: AuthenticatedClient;
+  setClient: (params?: SetClientParams) => void;
+};
+
+export type AuthenticatedClient = {
+  client: MatrixClient;
+  isPasswordlessUser: boolean;
+  changePassword: (password: string) => Promise<void>;
+  logout: () => void;
+};
+
+export type ErrorState = {
+  state: "error";
+  error: Error;
+};
+
+export type SetClientParams = {
+  client: MatrixClient;
+  session: Session;
+};
+
+const ClientContext = createContext<ClientState | undefined>(undefined);
+
+export const useClientState = () => useContext(ClientContext);
+
+export function useClient(): {
+  client?: MatrixClient;
+  setClient?: (params?: SetClientParams) => void;
+} {
+  let client;
+  let setClient;
+
+  const clientState = useClientState();
+  if (clientState?.state === "valid") {
+    client = clientState.authenticated?.client;
+    setClient = clientState.setClient;
+  }
+
+  return { client, setClient };
+}
+
+// Plain representation of the `ClientContext` as a helper for old components that expected an object with multiple fields.
+export function useClientLegacy(): {
+  client?: MatrixClient;
+  setClient?: (params?: SetClientParams) => void;
   passwordlessUser: boolean;
-  tempPassword?: string;
+  loading: boolean;
+  authenticated: boolean;
+  logout?: () => void;
+  error?: Error;
+} {
+  const clientState = useClientState();
+
+  let client;
+  let setClient;
+  let passwordlessUser = false;
+  let loading = true;
+  let error;
+  let authenticated = false;
+  let logout;
+
+  if (clientState?.state === "valid") {
+    client = clientState.authenticated?.client;
+    setClient = clientState.setClient;
+    passwordlessUser = clientState.authenticated?.isPasswordlessUser ?? false;
+    loading = false;
+    authenticated = client !== undefined;
+    logout = clientState.authenticated?.logout;
+  } else if (clientState?.state === "error") {
+    error = clientState.error;
+    loading = false;
+  }
+
+  return {
+    client,
+    setClient,
+    passwordlessUser,
+    loading,
+    authenticated,
+    logout,
+    error,
+  };
 }
 
 const loadChannel =
   "BroadcastChannel" in window ? new BroadcastChannel("load") : null;
 
-const loadSession = (): Session => {
-  const data = localStorage.getItem("matrix-auth-store");
-  if (data) return JSON.parse(data);
-  return null;
-};
-const saveSession = (session: Session) =>
-  localStorage.setItem("matrix-auth-store", JSON.stringify(session));
-const clearSession = () => localStorage.removeItem("matrix-auth-store");
-
-interface ClientState {
-  loading: boolean;
-  isAuthenticated: boolean;
-  isPasswordlessUser: boolean;
-  client: MatrixClient;
-  userName: string;
-  changePassword: (password: string) => Promise<void>;
-  logout: () => void;
-  setClient: (client: MatrixClient, session: Session) => void;
-  error?: Error;
-}
-
-const ClientContext = createContext<ClientState>(null);
-
-type ClientProviderState = Omit<
-  ClientState,
-  "changePassword" | "logout" | "setClient"
-> & { error?: Error };
-
 interface Props {
   children: JSX.Element;
 }
 
 export const ClientProvider: FC<Props> = ({ children }) => {
   const history = useHistory();
-  const initializing = useRef(false);
-  const [
-    { loading, isAuthenticated, isPasswordlessUser, client, userName, error },
-    setState,
-  ] = useState<ClientProviderState>({
-    loading: true,
-    isAuthenticated: false,
-    isPasswordlessUser: false,
-    client: undefined,
-    userName: null,
-    error: undefined,
-  });
 
+  const [initClientState, setInitClientState] = useState<
+    InitResult | undefined
+  >(undefined);
+
+  const initializing = useRef(false);
   useEffect(() => {
     // In case the component is mounted, unmounted, and remounted quickly (as
     // React does in strict mode), we need to make sure not to doubly initialize
-    // the client
+    // the client.
     if (initializing.current) return;
     initializing.current = true;
 
-    const init = async (): Promise<
-      Pick<ClientProviderState, "client" | "isPasswordlessUser">
-    > => {
-      if (widget) {
-        // We're inside a widget, so let's engage *matryoshka mode*
-        logger.log("Using a matryoshka client");
-        return {
-          client: await widget.client,
-          isPasswordlessUser: false,
-        };
-      } else {
-        // We're running as a standalone application
-        try {
-          const session = loadSession();
-          if (!session) return { client: undefined, isPasswordlessUser: false };
-
-          logger.log("Using a standalone client");
-
-          /* eslint-disable camelcase */
-          const { user_id, device_id, access_token, passwordlessUser } =
-            session;
-
-          const livekit = Config.get().livekit;
-          const foci = livekit
-            ? [
-                {
-                  livekitServiceUrl: livekit.livekit_service_url,
-                },
-              ]
-            : undefined;
-
-          try {
-            return {
-              client: await initClient(
-                {
-                  baseUrl: Config.defaultHomeserverUrl(),
-                  accessToken: access_token,
-                  userId: user_id,
-                  deviceId: device_id,
-                  fallbackICEServerAllowed: fallbackICEServerAllowed,
-                  foci,
-                },
-                true
-              ),
-              isPasswordlessUser: passwordlessUser,
-            };
-          } catch (err) {
-            if (err instanceof CryptoStoreIntegrityError) {
-              // We can't use this session anymore, so let's log it out
-              try {
-                const client = await initClient(
-                  {
-                    baseUrl: Config.defaultHomeserverUrl(),
-                    accessToken: access_token,
-                    userId: user_id,
-                    deviceId: device_id,
-                    fallbackICEServerAllowed: fallbackICEServerAllowed,
-                    foci,
-                  },
-                  false // Don't need the crypto store just to log out
-                );
-                await client.logout(true);
-              } catch (err_) {
-                logger.warn(
-                  "The previous session was lost, and we couldn't log it out, " +
-                    "either"
-                );
-              }
-            }
-            throw err;
-          }
-          /* eslint-enable camelcase */
-        } catch (err) {
-          clearSession();
-          throw err;
+    loadClient()
+      .then((maybeClient) => {
+        if (!maybeClient) {
+          logger.error("Failed to initialize client");
+          return;
         }
-      }
-    };
 
-    init()
-      .then(({ client, isPasswordlessUser }) => {
-        setState({
-          client,
-          loading: false,
-          isAuthenticated: Boolean(client),
-          isPasswordlessUser,
-          userName: client?.getUserIdLocalpart(),
-          error: undefined,
-        });
-      })
-      .catch((err) => {
-        logger.error(err);
-        setState({
-          client: undefined,
-          loading: false,
-          isAuthenticated: false,
-          isPasswordlessUser: false,
-          userName: null,
-          error: undefined,
-        });
+        setInitClientState(maybeClient);
       })
+      .catch((err) => logger.error(err))
       .finally(() => (initializing.current = false));
   }, []);
 
   const changePassword = useCallback(
     async (password: string) => {
-      const { tempPassword, ...session } = loadSession();
+      const session = loadSession();
+      if (!initClientState?.client || !session) {
+        return;
+      }
 
-      await client.setPassword(
+      await initClientState.client.setPassword(
         {
           type: "m.login.password",
           identifier: {
@@ -232,73 +189,56 @@ export const ClientProvider: FC<Props> = ({ children }) => {
             user: session.user_id,
           },
           user: session.user_id,
-          password: tempPassword,
+          password: session.tempPassword,
         },
         password
       );
 
       saveSession({ ...session, passwordlessUser: false });
 
-      setState({
-        client,
-        loading: false,
-        isAuthenticated: true,
-        isPasswordlessUser: false,
-        userName: client.getUserIdLocalpart(),
-        error: undefined,
+      setInitClientState({
+        client: initClientState.client,
+        passwordlessUser: false,
       });
     },
-    [client]
+    [initClientState?.client]
   );
 
   const setClient = useCallback(
-    (newClient: MatrixClient, session: Session) => {
-      if (client && client !== newClient) {
-        client.stopClient();
+    (clientParams?: SetClientParams) => {
+      const oldClient = initClientState?.client;
+      const newClient = clientParams?.client;
+      if (oldClient && oldClient !== newClient) {
+        oldClient.stopClient();
       }
 
-      if (newClient) {
-        saveSession(session);
-
-        setState({
-          client: newClient,
-          loading: false,
-          isAuthenticated: true,
-          isPasswordlessUser: session.passwordlessUser,
-          userName: newClient.getUserIdLocalpart(),
-          error: undefined,
+      if (clientParams) {
+        saveSession(clientParams.session);
+        setInitClientState({
+          client: clientParams.client,
+          passwordlessUser: clientParams.session.passwordlessUser,
         });
       } else {
         clearSession();
-
-        setState({
-          client: undefined,
-          loading: false,
-          isAuthenticated: false,
-          isPasswordlessUser: false,
-          userName: null,
-          error: undefined,
-        });
+        setInitClientState(undefined);
       }
     },
-    [client]
+    [initClientState?.client]
   );
 
   const logout = useCallback(async () => {
+    const client = initClientState?.client;
+    if (!client) {
+      return;
+    }
+
     await client.logout(true);
     await client.clearStores();
     clearSession();
-    setState({
-      client: undefined,
-      loading: false,
-      isAuthenticated: false,
-      isPasswordlessUser: true,
-      userName: "",
-      error: undefined,
-    });
+    setInitClientState(undefined);
     history.push("/");
     PosthogAnalytics.instance.setRegistrationType(RegistrationType.Guest);
-  }, [history, client]);
+  }, [history, initClientState?.client]);
 
   const { t } = useTranslation();
 
@@ -310,61 +250,144 @@ export const ClientProvider: FC<Props> = ({ children }) => {
     if (!widget) loadChannel?.postMessage({});
   }, []);
 
+  const [alreadyOpenedErr, setAlreadyOpenedErr] = useState<Error | undefined>(
+    undefined
+  );
   useEventTarget(
     loadChannel,
     "message",
     useCallback(() => {
-      client?.stopClient();
-
-      setState((prev) => ({
-        ...prev,
-        error: translatedError(
-          "This application has been opened in another tab.",
-          t
-        ),
-      }));
-    }, [client, setState, t])
+      initClientState?.client.stopClient();
+      setAlreadyOpenedErr(
+        translatedError("This application has been opened in another tab.", t)
+      );
+    }, [initClientState?.client, setAlreadyOpenedErr, t])
   );
 
-  const context = useMemo<ClientState>(
-    () => ({
-      loading,
-      isAuthenticated,
-      isPasswordlessUser,
-      client,
-      changePassword,
-      logout,
-      userName,
-      setClient,
-      error: undefined,
-    }),
-    [
-      loading,
-      isAuthenticated,
-      isPasswordlessUser,
-      client,
-      changePassword,
-      logout,
-      userName,
-      setClient,
-    ]
-  );
+  const state: ClientState = useMemo(() => {
+    if (alreadyOpenedErr) {
+      return { state: "error", error: alreadyOpenedErr };
+    }
+
+    let authenticated = undefined;
+    if (initClientState) {
+      authenticated = {
+        client: initClientState.client,
+        isPasswordlessUser: initClientState.passwordlessUser,
+        changePassword,
+        logout,
+      };
+    }
+
+    return { state: "valid", authenticated, setClient };
+  }, [alreadyOpenedErr, changePassword, initClientState, logout, setClient]);
 
   useEffect(() => {
-    window.matrixclient = client;
-    window.isPasswordlessUser = isPasswordlessUser;
+    if (!initClientState) {
+      return;
+    }
+
+    window.matrixclient = initClientState.client;
+    window.passwordlessUser = initClientState.passwordlessUser;
 
     if (PosthogAnalytics.hasInstance())
       PosthogAnalytics.instance.onLoginStatusChanged();
-  }, [client, isPasswordlessUser]);
+  }, [initClientState]);
 
-  if (error) {
-    return <ErrorView error={error} />;
+  if (alreadyOpenedErr) {
+    return <ErrorView error={alreadyOpenedErr} />;
   }
 
   return (
-    <ClientContext.Provider value={context}>{children}</ClientContext.Provider>
+    <ClientContext.Provider value={state}>{children}</ClientContext.Provider>
   );
 };
 
-export const useClient = () => useContext(ClientContext);
+type InitResult = {
+  client: MatrixClient;
+  passwordlessUser: boolean;
+};
+
+async function loadClient(): Promise<InitResult> {
+  if (widget) {
+    // We're inside a widget, so let's engage *matryoshka mode*
+    logger.log("Using a matryoshka client");
+    const client = await widget.client;
+    return {
+      client,
+      passwordlessUser: false,
+    };
+  } else {
+    // We're running as a standalone application
+    try {
+      const session = loadSession();
+      if (!session) {
+        throw new Error("No session stored");
+      }
+
+      logger.log("Using a standalone client");
+
+      const foci = Config.get().livekit
+        ? [{ livekitServiceUrl: Config.get().livekit!.livekit_service_url }]
+        : undefined;
+
+      /* eslint-disable camelcase */
+      const { user_id, device_id, access_token, passwordlessUser } = session;
+      const initClientParams = {
+        baseUrl: Config.defaultHomeserverUrl()!,
+        accessToken: access_token,
+        userId: user_id,
+        deviceId: device_id,
+        fallbackICEServerAllowed: fallbackICEServerAllowed,
+        foci,
+      };
+
+      try {
+        const client = await initClient(initClientParams, true);
+        return {
+          client,
+          passwordlessUser,
+        };
+      } catch (err) {
+        if (err instanceof CryptoStoreIntegrityError) {
+          // We can't use this session anymore, so let's log it out
+          try {
+            const client = await initClient(initClientParams, false); // Don't need the crypto store just to log out)
+            await client.logout(true);
+          } catch (err) {
+            logger.warn(
+              "The previous session was lost, and we couldn't log it out, " +
+                err +
+                "either"
+            );
+          }
+        }
+        throw err;
+      }
+      /* eslint-enable camelcase */
+    } catch (err) {
+      clearSession();
+      throw err;
+    }
+  }
+}
+
+export interface Session {
+  user_id: string;
+  device_id: string;
+  access_token: string;
+  passwordlessUser: boolean;
+  tempPassword?: string;
+}
+
+const clearSession = () => localStorage.removeItem("matrix-auth-store");
+const saveSession = (s: Session) =>
+  localStorage.setItem("matrix-auth-store", JSON.stringify(s));
+const loadSession = (): Session | undefined => {
+  const data = localStorage.getItem("matrix-auth-store");
+  if (!data) {
+    return undefined;
+  }
+
+  return JSON.parse(data);
+};
diff --git a/src/Facepile.tsx b/src/Facepile.tsx
index f5ffff62..0c9ec239 100644
--- a/src/Facepile.tsx
+++ b/src/Facepile.tsx
@@ -47,8 +47,8 @@ export function Facepile({
 }: Props) {
   const { t } = useTranslation();
 
-  const _size = sizes.get(size);
-  const _overlap = overlapMap[size];
+  const _size = sizes.get(size)!;
+  const _overlap = overlapMap[size]!;
 
   const title = useMemo(() => {
     return members.reduce<string | null>(
diff --git a/src/ListBox.tsx b/src/ListBox.tsx
index 0ee2542a..b7ec7c72 100644
--- a/src/ListBox.tsx
+++ b/src/ListBox.tsx
@@ -36,15 +36,16 @@ export function ListBox<T>({
   listBoxRef,
   ...rest
 }: ListBoxProps<T>) {
-  const ref = useRef<HTMLUListElement>();
-  if (!listBoxRef) listBoxRef = ref;
+  const ref = useRef<HTMLUListElement>(null);
 
-  const { listBoxProps } = useListBox(rest, state, listBoxRef);
+  const listRef = listBoxRef ?? ref;
+
+  const { listBoxProps } = useListBox(rest, state, listRef);
 
   return (
     <ul
       {...listBoxProps}
-      ref={listBoxRef}
+      ref={listRef}
       className={classNames(styles.listBox, className)}
     >
       {[...state.collection].map((item) => (
@@ -66,7 +67,7 @@ interface OptionProps<T> {
 }
 
 function Option<T>({ item, state, className }: OptionProps<T>) {
-  const ref = useRef();
+  const ref = useRef(null);
   const { optionProps, isSelected, isFocused, isDisabled } = useOption(
     { key: item.key },
     state,
@@ -83,7 +84,11 @@ function Option<T>({ item, state, className }: OptionProps<T>) {
   const origPointerUp = optionProps.onPointerUp;
   delete optionProps.onPointerUp;
   optionProps.onClick = useCallback(
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     (e) => {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       origPointerUp(e as unknown as PointerEvent<HTMLElement>);
     },
     [origPointerUp]
diff --git a/src/Menu.tsx b/src/Menu.tsx
index 1e158413..d7982df7 100644
--- a/src/Menu.tsx
+++ b/src/Menu.tsx
@@ -26,7 +26,7 @@ import styles from "./Menu.module.css";
 
 interface MenuProps<T> extends AriaMenuOptions<T> {
   className?: String;
-  onClose?: () => void;
+  onClose: () => void;
   onAction: (value: Key) => void;
   label?: string;
 }
@@ -39,7 +39,7 @@ export function Menu<T extends object>({
   ...rest
 }: MenuProps<T>) {
   const state = useTreeState<T>({ ...rest, selectionMode: "none" });
-  const menuRef = useRef();
+  const menuRef = useRef(null);
   const { menuProps } = useMenu<T>(rest, state, menuRef);
 
   return (
@@ -69,7 +69,7 @@ interface MenuItemProps<T> {
 }
 
 function MenuItem<T>({ item, state, onAction, onClose }: MenuItemProps<T>) {
-  const ref = useRef();
+  const ref = useRef(null);
   const { menuItemProps } = useMenuItem(
     {
       key: item.key,
diff --git a/src/Modal.tsx b/src/Modal.tsx
index 07217539..56db481e 100644
--- a/src/Modal.tsx
+++ b/src/Modal.tsx
@@ -55,7 +55,7 @@ export function Modal({
   ...rest
 }: ModalProps) {
   const { t } = useTranslation();
-  const modalRef = useRef();
+  const modalRef = useRef(null);
   const { overlayProps, underlayProps } = useOverlay(
     { ...rest, onClose },
     modalRef
@@ -63,7 +63,7 @@ export function Modal({
   usePreventScroll();
   const { modalProps } = useModal();
   const { dialogProps, titleProps } = useDialog(rest, modalRef);
-  const closeButtonRef = useRef();
+  const closeButtonRef = useRef(null);
   const { buttonProps: closeButtonProps } = useButton(
     {
       onPress: () => onClose(),
diff --git a/src/SequenceDiagramViewerPage.tsx b/src/SequenceDiagramViewerPage.tsx
index 208352fe..9fb66f94 100644
--- a/src/SequenceDiagramViewerPage.tsx
+++ b/src/SequenceDiagramViewerPage.tsx
@@ -36,6 +36,9 @@ export function SequenceDiagramViewerPage() {
 
   const [debugLog, setDebugLog] = useState<DebugLog>();
   const [selectedUserId, setSelectedUserId] = useState<string>();
+
+  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+  // @ts-ignore
   const onChangeDebugLog = useCallback((e) => {
     if (e.target.files && e.target.files.length > 0) {
       e.target.files[0].text().then((text: string) => {
@@ -55,7 +58,7 @@ export function SequenceDiagramViewerPage() {
           onChange={onChangeDebugLog}
         />
       </FieldRow>
-      {debugLog && (
+      {debugLog && selectedUserId && (
         <SequenceDiagramViewer
           localUserId={debugLog.localUserId}
           selectedUserId={selectedUserId}
diff --git a/src/Tooltip.tsx b/src/Tooltip.tsx
index e090633b..da2d52ea 100644
--- a/src/Tooltip.tsx
+++ b/src/Tooltip.tsx
@@ -74,7 +74,7 @@ export const TooltipTrigger = forwardRef<HTMLElement, TooltipTriggerProps>(
     const tooltipTriggerProps = { delay: 250, ...rest };
     const tooltipState = useTooltipTriggerState(tooltipTriggerProps);
     const triggerRef = useObjectRef<HTMLElement>(ref);
-    const overlayRef = useRef();
+    const overlayRef = useRef<HTMLDivElement>(null);
     const { triggerProps, tooltipProps } = useTooltipTrigger(
       tooltipTriggerProps,
       tooltipState,
diff --git a/src/UserMenu.tsx b/src/UserMenu.tsx
index 5648edd9..9df3309d 100644
--- a/src/UserMenu.tsx
+++ b/src/UserMenu.tsx
@@ -36,7 +36,7 @@ interface UserMenuProps {
   isAuthenticated: boolean;
   isPasswordlessUser: boolean;
   displayName: string;
-  avatarUrl: string;
+  avatarUrl?: string;
   onAction: (value: string) => void;
 }
 
@@ -119,21 +119,24 @@ export function UserMenu({
           )}
         </Button>
       </TooltipTrigger>
-      {(props) => (
-        <Menu {...props} label={t("User menu")} onAction={onAction}>
-          {items.map(({ key, icon: Icon, label, dataTestid }) => (
-            <Item key={key} textValue={label}>
-              <Icon
-                width={24}
-                height={24}
-                className={styles.menuIcon}
-                data-testid={dataTestid}
-              />
-              <Body overflowEllipsis>{label}</Body>
-            </Item>
-          ))}
-        </Menu>
-      )}
+      {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        (props: any) => (
+          <Menu {...props} label={t("User menu")} onAction={onAction}>
+            {items.map(({ key, icon: Icon, label, dataTestid }) => (
+              <Item key={key} textValue={label}>
+                <Icon
+                  width={24}
+                  height={24}
+                  className={styles.menuIcon}
+                  data-testid={dataTestid}
+                />
+                <Body overflowEllipsis>{label}</Body>
+              </Item>
+            ))}
+          </Menu>
+        )
+      }
     </PopoverMenuTrigger>
   );
 }
diff --git a/src/UserMenuContainer.tsx b/src/UserMenuContainer.tsx
index 4702c4fe..6a83133e 100644
--- a/src/UserMenuContainer.tsx
+++ b/src/UserMenuContainer.tsx
@@ -17,7 +17,7 @@ limitations under the License.
 import { useCallback, useState } from "react";
 import { useHistory, useLocation } from "react-router-dom";
 
-import { useClient } from "./ClientContext";
+import { useClientLegacy } from "./ClientContext";
 import { useProfile } from "./profile/useProfile";
 import { useModalTriggerState } from "./Modal";
 import { SettingsModal } from "./settings/SettingsModal";
@@ -30,8 +30,7 @@ interface Props {
 export function UserMenuContainer({ preventNavigation = false }: Props) {
   const location = useLocation();
   const history = useHistory();
-  const { isAuthenticated, isPasswordlessUser, logout, userName, client } =
-    useClient();
+  const { client, logout, authenticated, passwordlessUser } = useClientLegacy();
   const { displayName, avatarUrl } = useProfile(client);
   const { modalState, modalProps } = useModalTriggerState();
 
@@ -49,7 +48,7 @@ export function UserMenuContainer({ preventNavigation = false }: Props) {
           modalState.open();
           break;
         case "logout":
-          logout();
+          logout?.();
           break;
         case "login":
           history.push("/login", { state: { from: location } });
@@ -59,19 +58,18 @@ export function UserMenuContainer({ preventNavigation = false }: Props) {
     [history, location, logout, modalState]
   );
 
+  const userName = client?.getUserIdLocalpart() ?? "";
   return (
     <>
       <UserMenu
         preventNavigation={preventNavigation}
-        isAuthenticated={isAuthenticated}
-        isPasswordlessUser={isPasswordlessUser}
+        isAuthenticated={authenticated}
+        isPasswordlessUser={passwordlessUser}
         avatarUrl={avatarUrl}
         onAction={onAction}
-        displayName={
-          displayName || (userName ? userName.replace("@", "") : undefined)
-        }
+        displayName={displayName || (userName ? userName.replace("@", "") : "")}
       />
-      {modalState.isOpen && (
+      {modalState.isOpen && client && (
         <SettingsModal
           client={client}
           defaultTab={defaultSettingsTab}
diff --git a/src/analytics/PosthogAnalytics.ts b/src/analytics/PosthogAnalytics.ts
index 9397eb87..9ef2e70c 100644
--- a/src/analytics/PosthogAnalytics.ts
+++ b/src/analytics/PosthogAnalytics.ts
@@ -98,7 +98,7 @@ export class PosthogAnalytics {
   // set true during the constructor if posthog config is present, otherwise false
   private static internalInstance: PosthogAnalytics | null = null;
 
-  private identificationPromise: Promise<void>;
+  private identificationPromise?: Promise<void>;
   private readonly enabled: boolean = false;
   private anonymity = Anonymity.Disabled;
   private platformSuperProperties = {};
@@ -255,7 +255,9 @@ export class PosthogAnalytics {
       } catch (e) {
         // The above could fail due to network requests, but not essential to starting the application,
         // so swallow it.
-        logger.log("Unable to identify user for tracking" + e.toString());
+        logger.log(
+          "Unable to identify user for tracking" + (e as Error)?.toString()
+        );
       }
       if (analyticsID) {
         this.posthog.identify(analyticsID);
@@ -366,7 +368,7 @@ export class PosthogAnalytics {
 
     if (anonymity === Anonymity.Pseudonymous) {
       this.setRegistrationType(
-        window.matrixclient.isGuest() || window.isPasswordlessUser
+        window.matrixclient.isGuest() || window.passwordlessUser
           ? RegistrationType.Guest
           : RegistrationType.Registered
       );
diff --git a/src/auth/LoginPage.tsx b/src/auth/LoginPage.tsx
index c5a090f1..f17f24fa 100644
--- a/src/auth/LoginPage.tsx
+++ b/src/auth/LoginPage.tsx
@@ -35,8 +35,8 @@ export const LoginPage: FC = () => {
   const { setClient } = useClient();
   const login = useInteractiveLogin();
   const homeserver = Config.defaultHomeserverUrl(); // TODO: Make this configurable
-  const usernameRef = useRef<HTMLInputElement>();
-  const passwordRef = useRef<HTMLInputElement>();
+  const usernameRef = useRef<HTMLInputElement>(null);
+  const passwordRef = useRef<HTMLInputElement>(null);
   const history = useHistory();
   const location = useLocation();
   const [loading, setLoading] = useState(false);
@@ -49,12 +49,27 @@ export const LoginPage: FC = () => {
       e.preventDefault();
       setLoading(true);
 
+      if (!homeserver || !usernameRef.current || !passwordRef.current) {
+        setError(Error("Login parameters are undefined"));
+        setLoading(false);
+        return;
+      }
+
       login(homeserver, usernameRef.current.value, passwordRef.current.value)
         .then(([client, session]) => {
-          setClient(client, session);
+          if (!setClient) {
+            return;
+          }
 
-          if (location.state && location.state.from) {
-            history.push(location.state.from);
+          setClient({ client, session });
+
+          const locationState = location.state;
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          // @ts-ignore
+          if (locationState && locationState.from) {
+            // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+            // @ts-ignore
+            history.push(locationState.from);
           } else {
             history.push("/");
           }
diff --git a/src/auth/RegisterPage.tsx b/src/auth/RegisterPage.tsx
index c96dea29..a486aa46 100644
--- a/src/auth/RegisterPage.tsx
+++ b/src/auth/RegisterPage.tsx
@@ -30,7 +30,7 @@ import { Trans, useTranslation } from "react-i18next";
 
 import { FieldRow, InputField, ErrorMessage } from "../input/Input";
 import { Button } from "../button";
-import { useClient } from "../ClientContext";
+import { useClientLegacy } from "../ClientContext";
 import { useInteractiveRegistration } from "./useInteractiveRegistration";
 import styles from "./LoginPage.module.css";
 import { ReactComponent as Logo } from "../icons/LogoLarge.svg";
@@ -45,9 +45,10 @@ export const RegisterPage: FC = () => {
   const { t } = useTranslation();
   usePageTitle(t("Register"));
 
-  const { loading, isAuthenticated, isPasswordlessUser, client, setClient } =
-    useClient();
-  const confirmPasswordRef = useRef<HTMLInputElement>();
+  const { loading, authenticated, passwordlessUser, client, setClient } =
+    useClientLegacy();
+
+  const confirmPasswordRef = useRef<HTMLInputElement>(null);
   const history = useHistory();
   const location = useLocation();
   const [registering, setRegistering] = useState(false);
@@ -75,10 +76,15 @@ export const RegisterPage: FC = () => {
           userName,
           password,
           userName,
-          recaptchaResponse
+          recaptchaResponse,
+          passwordlessUser
         );
 
-        if (client && isPasswordlessUser) {
+        if (!client || !client.groupCallEventHandler || !setClient) {
+          return;
+        }
+
+        if (passwordlessUser) {
           // Migrate the user's rooms
           for (const groupCall of client.groupCallEventHandler.groupCalls.values()) {
             const roomId = groupCall.room.roomId;
@@ -86,7 +92,11 @@ export const RegisterPage: FC = () => {
             try {
               await newClient.joinRoom(roomId);
             } catch (error) {
+              // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+              // @ts-ignore
               if (error.errcode === "M_LIMIT_EXCEEDED") {
+                // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+                // @ts-ignore
                 await sleep(error.data.retry_after_ms);
                 await newClient.joinRoom(roomId);
               } else {
@@ -97,13 +107,17 @@ export const RegisterPage: FC = () => {
           }
         }
 
-        setClient(newClient, session);
+        setClient({ client: newClient, session });
         PosthogAnalytics.instance.eventSignup.cacheSignupEnd(new Date());
       };
 
       submit()
         .then(() => {
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          // @ts-ignore
           if (location.state?.from) {
+            // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+            // @ts-ignore
             history.push(location.state?.from);
           } else {
             history.push("/");
@@ -119,7 +133,7 @@ export const RegisterPage: FC = () => {
       register,
       location,
       history,
-      isPasswordlessUser,
+      passwordlessUser,
       reset,
       execute,
       client,
@@ -136,10 +150,10 @@ export const RegisterPage: FC = () => {
   }, [password, passwordConfirmation, t]);
 
   useEffect(() => {
-    if (!loading && isAuthenticated && !isPasswordlessUser && !registering) {
+    if (!loading && authenticated && !passwordlessUser && !registering) {
       history.push("/");
     }
-  }, [loading, history, isAuthenticated, isPasswordlessUser, registering]);
+  }, [loading, history, authenticated, passwordlessUser, registering]);
 
   if (loading) {
     return <LoadingView />;
diff --git a/src/auth/useInteractiveLogin.ts b/src/auth/useInteractiveLogin.ts
index 81b923f9..07dec12d 100644
--- a/src/auth/useInteractiveLogin.ts
+++ b/src/auth/useInteractiveLogin.ts
@@ -41,8 +41,10 @@ export const useInteractiveLogin = () =>
           },
           password,
         }),
-      stateUpdated: null,
-      requestEmailToken: null,
+      stateUpdated: (...args) => {},
+      requestEmailToken: (...args): Promise<{ sid: string }> => {
+        return Promise.resolve({ sid: "" });
+      },
     });
 
     // XXX: This claims to return an IAuthData which contains none of these
diff --git a/src/auth/useInteractiveRegistration.ts b/src/auth/useInteractiveRegistration.ts
index 2db33773..a4863671 100644
--- a/src/auth/useInteractiveRegistration.ts
+++ b/src/auth/useInteractiveRegistration.ts
@@ -23,28 +23,32 @@ import { Session } from "../ClientContext";
 import { Config } from "../config/Config";
 
 export const useInteractiveRegistration = (): {
-  privacyPolicyUrl: string;
-  recaptchaKey: string;
+  privacyPolicyUrl?: string;
+  recaptchaKey?: string;
   register: (
     username: string,
     password: string,
     displayName: string,
     recaptchaResponse: string,
-    passwordlessUser?: boolean
+    passwordlessUser: boolean
   ) => Promise<[MatrixClient, Session]>;
 } => {
-  const [privacyPolicyUrl, setPrivacyPolicyUrl] = useState<string>();
-  const [recaptchaKey, setRecaptchaKey] = useState<string>();
+  const [privacyPolicyUrl, setPrivacyPolicyUrl] = useState<string | undefined>(
+    undefined
+  );
+  const [recaptchaKey, setRecaptchaKey] = useState<string | undefined>(
+    undefined
+  );
 
   const authClient = useRef<MatrixClient>();
   if (!authClient.current) {
     authClient.current = createClient({
-      baseUrl: Config.defaultHomeserverUrl(),
+      baseUrl: Config.defaultHomeserverUrl()!,
     });
   }
 
   useEffect(() => {
-    authClient.current.registerRequest({}).catch((error) => {
+    authClient.current!.registerRequest({}).catch((error) => {
       setPrivacyPolicyUrl(
         error.data?.params["m.login.terms"]?.policies?.privacy_policy?.en?.url
       );
@@ -58,12 +62,12 @@ export const useInteractiveRegistration = (): {
       password: string,
       displayName: string,
       recaptchaResponse: string,
-      passwordlessUser?: boolean
+      passwordlessUser: boolean
     ): Promise<[MatrixClient, Session]> => {
       const interactiveAuth = new InteractiveAuth({
-        matrixClient: authClient.current,
+        matrixClient: authClient.current!,
         doRequest: (auth) =>
-          authClient.current.registerRequest({
+          authClient.current!.registerRequest({
             username,
             password,
             auth: auth || undefined,
@@ -84,7 +88,9 @@ export const useInteractiveRegistration = (): {
             });
           }
         },
-        requestEmailToken: null,
+        requestEmailToken: (...args) => {
+          return Promise.resolve({ sid: "dummy" });
+        },
       });
 
       // XXX: This claims to return an IAuthData which contains none of these
@@ -95,7 +101,7 @@ export const useInteractiveRegistration = (): {
 
       const client = await initClient(
         {
-          baseUrl: Config.defaultHomeserverUrl(),
+          baseUrl: Config.defaultHomeserverUrl()!,
           accessToken: access_token,
           userId: user_id,
           deviceId: device_id,
@@ -117,7 +123,7 @@ export const useInteractiveRegistration = (): {
         session.tempPassword = password;
       }
 
-      const user = client.getUser(client.getUserId());
+      const user = client.getUser(client.getUserId()!)!;
       user.setRawDisplayName(displayName);
       user.setDisplayName(displayName);
 
diff --git a/src/auth/useRecaptcha.ts b/src/auth/useRecaptcha.ts
index ef3c7c26..647370da 100644
--- a/src/auth/useRecaptcha.ts
+++ b/src/auth/useRecaptcha.ts
@@ -34,7 +34,7 @@ interface RecaptchaPromiseRef {
   reject: (error: Error) => void;
 }
 
-export const useRecaptcha = (sitekey: string) => {
+export const useRecaptcha = (sitekey?: string) => {
   const { t } = useTranslation();
   const [recaptchaId] = useState(() => randomString(16));
   const promiseRef = useRef<RecaptchaPromiseRef>();
@@ -68,9 +68,9 @@ export const useRecaptcha = (sitekey: string) => {
     }
   }, [recaptchaId, sitekey]);
 
-  const execute = useCallback(() => {
+  const execute = useCallback((): Promise<string> => {
     if (!sitekey) {
-      return Promise.resolve(null);
+      return Promise.resolve("");
     }
 
     if (!window.grecaptcha) {
diff --git a/src/auth/useRegisterPasswordlessUser.ts b/src/auth/useRegisterPasswordlessUser.ts
index 94d40cd2..983789ba 100644
--- a/src/auth/useRegisterPasswordlessUser.ts
+++ b/src/auth/useRegisterPasswordlessUser.ts
@@ -23,9 +23,9 @@ import { generateRandomName } from "../auth/generateRandomName";
 import { useRecaptcha } from "../auth/useRecaptcha";
 
 interface UseRegisterPasswordlessUserType {
-  privacyPolicyUrl: string;
+  privacyPolicyUrl?: string;
   registerPasswordlessUser: (displayName: string) => Promise<void>;
-  recaptchaId: string;
+  recaptchaId?: string;
 }
 
 export function useRegisterPasswordlessUser(): UseRegisterPasswordlessUserType {
@@ -36,6 +36,10 @@ export function useRegisterPasswordlessUser(): UseRegisterPasswordlessUserType {
 
   const registerPasswordlessUser = useCallback(
     async (displayName: string) => {
+      if (!setClient) {
+        throw new Error("No client context");
+      }
+
       try {
         const recaptchaResponse = await execute();
         const userName = generateRandomName();
@@ -46,7 +50,7 @@ export function useRegisterPasswordlessUser(): UseRegisterPasswordlessUserType {
           recaptchaResponse,
           true
         );
-        setClient(client, session);
+        setClient({ client, session });
       } catch (e) {
         reset();
         throw e;
diff --git a/src/button/LinkButton.tsx b/src/button/LinkButton.tsx
index 3f3b1d55..3392935d 100644
--- a/src/button/LinkButton.tsx
+++ b/src/button/LinkButton.tsx
@@ -46,7 +46,7 @@ export function LinkButton({
     <Link
       className={classNames(
         variantToClassName[variant || "secondary"],
-        sizeToClassName[size],
+        size ? sizeToClassName[size] : [],
         className
       )}
       to={to}
diff --git a/src/config/Config.ts b/src/config/Config.ts
index cabd460b..f414c58b 100644
--- a/src/config/Config.ts
+++ b/src/config/Config.ts
@@ -45,11 +45,11 @@ export class Config {
 
   // Convenience accessors
   public static defaultHomeserverUrl(): string | undefined {
-    return Config.get().default_server_config["m.homeserver"].base_url;
+    return Config.get().default_server_config?.["m.homeserver"].base_url;
   }
 
   public static defaultServerName(): string | undefined {
-    return Config.get().default_server_config["m.homeserver"].server_name;
+    return Config.get().default_server_config?.["m.homeserver"].server_name;
   }
 
   public config?: ResolvedConfigOptions;
diff --git a/src/home/CallTypeDropdown.tsx b/src/home/CallTypeDropdown.tsx
index 712523d4..f24d3d48 100644
--- a/src/home/CallTypeDropdown.tsx
+++ b/src/home/CallTypeDropdown.tsx
@@ -42,6 +42,12 @@ interface Props {
 export const CallTypeDropdown: FC<Props> = ({ callType, setCallType }) => {
   const { t } = useTranslation();
 
+  const onAction = (key: React.Key) => {
+    setCallType(key.toString() as CallType);
+  };
+
+  const onClose = () => {};
+
   return (
     <PopoverMenuTrigger placement="bottom">
       <Button variant="dropdown" className={commonStyles.headline}>
@@ -52,7 +58,12 @@ export const CallTypeDropdown: FC<Props> = ({ callType, setCallType }) => {
         </Headline>
       </Button>
       {(props: JSX.IntrinsicAttributes) => (
-        <Menu {...props} label={t("Call type menu")} onAction={setCallType}>
+        <Menu
+          {...props}
+          label={t("Call type menu")}
+          onAction={onAction}
+          onClose={onClose}
+        >
           <Item key={CallType.Video} textValue={t("Video call")}>
             <VideoIcon />
             <span>{t("Video call")}</span>
diff --git a/src/home/HomePage.tsx b/src/home/HomePage.tsx
index 4c5522df..018e0512 100644
--- a/src/home/HomePage.tsx
+++ b/src/home/HomePage.tsx
@@ -16,7 +16,7 @@ limitations under the License.
 
 import { useTranslation } from "react-i18next";
 
-import { useClient } from "../ClientContext";
+import { useClientState } from "../ClientContext";
 import { ErrorView, LoadingView } from "../FullScreenView";
 import { UnauthenticatedView } from "./UnauthenticatedView";
 import { RegisteredView } from "./RegisteredView";
@@ -26,16 +26,18 @@ export function HomePage() {
   const { t } = useTranslation();
   usePageTitle(t("Home"));
 
-  const { isAuthenticated, isPasswordlessUser, loading, error, client } =
-    useClient();
+  const clientState = useClientState();
 
-  if (loading) {
+  if (!clientState) {
     return <LoadingView />;
-  } else if (error) {
-    return <ErrorView error={error} />;
+  } else if (clientState.state === "error") {
+    return <ErrorView error={clientState.error} />;
   } else {
-    return isAuthenticated ? (
-      <RegisteredView isPasswordlessUser={isPasswordlessUser} client={client} />
+    return clientState.authenticated ? (
+      <RegisteredView
+        isPasswordlessUser={clientState.authenticated.isPasswordlessUser}
+        client={clientState.authenticated.client}
+      />
     ) : (
       <UnauthenticatedView />
     );
diff --git a/src/home/RegisteredView.tsx b/src/home/RegisteredView.tsx
index f46376a8..54f52491 100644
--- a/src/home/RegisteredView.tsx
+++ b/src/home/RegisteredView.tsx
@@ -70,10 +70,9 @@ export function RegisteredView({ client, isPasswordlessUser }: Props) {
         setError(undefined);
         setLoading(true);
 
-        const [roomIdOrAlias] = await createRoom(client, roomName, ptt);
-
-        if (roomIdOrAlias) {
-          history.push(`/room/${roomIdOrAlias}`);
+        const [roomAlias] = await createRoom(client, roomName, ptt);
+        if (roomAlias) {
+          history.push(`/room/${roomAlias}`);
         }
       }
 
diff --git a/src/home/UnauthenticatedView.tsx b/src/home/UnauthenticatedView.tsx
index a0ee8904..554d8de6 100644
--- a/src/home/UnauthenticatedView.tsx
+++ b/src/home/UnauthenticatedView.tsx
@@ -79,15 +79,21 @@ export const UnauthenticatedView: FC = () => {
           true
         );
 
-        let roomIdOrAlias: string;
+        let roomAlias: string;
         try {
-          [roomIdOrAlias] = await createRoom(client, roomName, ptt);
+          [roomAlias] = await createRoom(client, roomName, ptt);
         } catch (error) {
+          if (!setClient) {
+            throw error;
+          }
+
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          // @ts-ignore
           if (error.errcode === "M_ROOM_IN_USE") {
             setOnFinished(() => {
-              setClient(client, session);
+              setClient({ client, session });
               const aliasLocalpart = roomAliasLocalpartFromRoomName(roomName);
-              const [, serverName] = client.getUserId().split(":");
+              const [, serverName] = client.getUserId()!.split(":");
               history.push(`/room/#${aliasLocalpart}:${serverName}`);
             });
 
@@ -100,8 +106,12 @@ export const UnauthenticatedView: FC = () => {
         }
 
         // Only consider the registration successful if we managed to create the room, too
-        setClient(client, session);
-        history.push(`/room/${roomIdOrAlias}`);
+        if (!setClient) {
+          throw new Error("setClient is undefined");
+        }
+
+        setClient({ client, session });
+        history.push(`/room/${roomAlias}`);
       }
 
       submit().catch((error) => {
@@ -204,7 +214,7 @@ export const UnauthenticatedView: FC = () => {
           </Body>
         </footer>
       </div>
-      {modalState.isOpen && (
+      {modalState.isOpen && onFinished && (
         <JoinExistingCallModal onJoin={onFinished} {...modalProps} />
       )}
     </>
diff --git a/src/home/useGroupCallRooms.ts b/src/home/useGroupCallRooms.ts
index fcbe67ff..463a1bb3 100644
--- a/src/home/useGroupCallRooms.ts
+++ b/src/home/useGroupCallRooms.ts
@@ -42,7 +42,7 @@ function getLastTs(client: MatrixClient, r: Room) {
     return ts;
   }
 
-  const myUserId = client.getUserId();
+  const myUserId = client.getUserId()!;
 
   if (r.getMyMembership() !== "join") {
     const membershipEvent = r.currentState.getStateEvents(
@@ -79,25 +79,30 @@ function sortRooms(client: MatrixClient, rooms: Room[]): Room[] {
 }
 
 export function useGroupCallRooms(client: MatrixClient): GroupCallRoom[] {
-  const [rooms, setRooms] = useState([]);
+  const [rooms, setRooms] = useState<GroupCallRoom[]>([]);
 
   useEffect(() => {
     function updateRooms() {
+      if (!client.groupCallEventHandler) {
+        return;
+      }
+
       const groupCalls = client.groupCallEventHandler.groupCalls.values();
       const rooms = Array.from(groupCalls).map((groupCall) => groupCall.room);
       const sortedRooms = sortRooms(client, rooms);
       const items = sortedRooms.map((room) => {
-        const groupCall = client.getGroupCallForRoom(room.roomId);
+        const groupCall = client.getGroupCallForRoom(room.roomId)!;
 
         return {
           roomId: room.getCanonicalAlias() || room.roomId,
           roomName: room.name,
-          avatarUrl: room.getMxcAvatarUrl(),
+          avatarUrl: room.getMxcAvatarUrl()!,
           room,
           groupCall,
-          participants: [...groupCall.participants],
+          participants: [...groupCall!.participants.keys()],
         };
       });
+
       setRooms(items);
     }
 
diff --git a/src/initializer.tsx b/src/initializer.tsx
index df5c8af6..f1f37966 100644
--- a/src/initializer.tsx
+++ b/src/initializer.tsx
@@ -229,5 +229,6 @@ export class Initializer {
       resolve();
     }
   }
-  private initPromise: Promise<void> | null;
+
+  private initPromise?: Promise<void>;
 }
diff --git a/src/input/AvatarInputField.tsx b/src/input/AvatarInputField.tsx
index 9280fad4..484f440e 100644
--- a/src/input/AvatarInputField.tsx
+++ b/src/input/AvatarInputField.tsx
@@ -15,10 +15,14 @@ limitations under the License.
 */
 
 import { useObjectRef } from "@react-aria/utils";
-import { AllHTMLAttributes, ChangeEvent, useEffect } from "react";
-import { useCallback } from "react";
-import { useState } from "react";
-import { forwardRef } from "react";
+import {
+  AllHTMLAttributes,
+  useEffect,
+  useCallback,
+  useState,
+  forwardRef,
+  ChangeEvent,
+} from "react";
 import classNames from "classnames";
 import { useTranslation } from "react-i18next";
 
@@ -43,7 +47,7 @@ export const AvatarInputField = forwardRef<HTMLInputElement, Props>(
     const { t } = useTranslation();
 
     const [removed, setRemoved] = useState(false);
-    const [objUrl, setObjUrl] = useState<string>(null);
+    const [objUrl, setObjUrl] = useState<string | undefined>(undefined);
 
     const fileInputRef = useObjectRef(ref);
 
@@ -52,11 +56,11 @@ export const AvatarInputField = forwardRef<HTMLInputElement, Props>(
 
       const onChange = (e: Event) => {
         const inputEvent = e as unknown as ChangeEvent<HTMLInputElement>;
-        if (inputEvent.target.files.length > 0) {
+        if (inputEvent.target.files && inputEvent.target.files.length > 0) {
           setObjUrl(URL.createObjectURL(inputEvent.target.files[0]));
           setRemoved(false);
         } else {
-          setObjUrl(null);
+          setObjUrl(undefined);
         }
       };
 
@@ -77,7 +81,7 @@ export const AvatarInputField = forwardRef<HTMLInputElement, Props>(
         <div className={styles.avatarContainer}>
           <Avatar
             size={Size.XL}
-            src={removed ? null : objUrl || avatarUrl}
+            src={removed ? undefined : objUrl || avatarUrl}
             fallback={displayName.slice(0, 1).toUpperCase()}
           />
           <input
diff --git a/src/input/Input.tsx b/src/input/Input.tsx
index a983f714..387d02d0 100644
--- a/src/input/Input.tsx
+++ b/src/input/Input.tsx
@@ -82,7 +82,7 @@ interface InputFieldProps {
   defaultValue?: string;
   placeholder?: string;
   defaultChecked?: boolean;
-  onChange?: (event: ChangeEvent) => void;
+  onChange?: (event: ChangeEvent<HTMLInputElement>) => void;
 }
 
 export const InputField = forwardRef<
@@ -119,6 +119,8 @@ export const InputField = forwardRef<
       >
         {prefix && <span>{prefix}</span>}
         {type === "textarea" ? (
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          // @ts-ignore
           <textarea
             id={id}
             ref={ref as ForwardedRef<HTMLTextAreaElement>}
diff --git a/src/input/SelectInput.tsx b/src/input/SelectInput.tsx
index cc86e43a..ff6ea7c3 100644
--- a/src/input/SelectInput.tsx
+++ b/src/input/SelectInput.tsx
@@ -34,7 +34,7 @@ export function SelectInput(props: Props): JSX.Element {
   const { t } = useTranslation();
   const state = useSelectState(props);
 
-  const ref = useRef();
+  const ref = useRef(null);
   const { labelProps, triggerProps, valueProps, menuProps } = useSelect(
     props,
     state,
diff --git a/src/livekit/OpenIDLoader.tsx b/src/livekit/OpenIDLoader.tsx
index 9e68d311..66b5cc76 100644
--- a/src/livekit/OpenIDLoader.tsx
+++ b/src/livekit/OpenIDLoader.tsx
@@ -37,7 +37,7 @@ interface Props {
   children: ReactNode;
 }
 
-const SFUConfigContext = createContext<SFUConfig>(undefined);
+const SFUConfigContext = createContext<SFUConfig | undefined>(undefined);
 
 export const useSFUConfig = () => useContext(SFUConfigContext);
 
@@ -62,7 +62,7 @@ export function OpenIDLoader({
         setState({ kind: "loaded", sfuConfig: result });
       } catch (e) {
         logger.error("Failed to fetch SFU config: ", e);
-        setState({ kind: "failed", error: e });
+        setState({ kind: "failed", error: e as Error });
       }
     })();
   }, [client, livekitServiceURL, roomName]);
diff --git a/src/livekit/useLiveKit.ts b/src/livekit/useLiveKit.ts
index c35f4f46..7a0a5330 100644
--- a/src/livekit/useLiveKit.ts
+++ b/src/livekit/useLiveKit.ts
@@ -17,7 +17,7 @@ export type DeviceChoices = {
 
 export function useLiveKit(
   userChoices: UserChoices,
-  sfuConfig: SFUConfig
+  sfuConfig?: SFUConfig
 ): Room | undefined {
   const roomOptions = useMemo((): RoomOptions => {
     const options = defaultLiveKitOptions;
@@ -33,8 +33,8 @@ export function useLiveKit(
   }, [userChoices.video, userChoices.audio]);
 
   const { room } = useLiveKitRoom({
-    token: sfuConfig.jwt,
-    serverUrl: sfuConfig.url,
+    token: sfuConfig?.jwt,
+    serverUrl: sfuConfig?.url,
     audio: userChoices.audio?.enabled ?? false,
     video: userChoices.video?.enabled ?? false,
     options: roomOptions,
diff --git a/src/matrix-utils.ts b/src/matrix-utils.ts
index 9a7645d2..ffbdf4e6 100644
--- a/src/matrix-utils.ts
+++ b/src/matrix-utils.ts
@@ -19,8 +19,7 @@ import { MemoryStore } from "matrix-js-sdk/src/store/memory";
 import { IndexedDBCryptoStore } from "matrix-js-sdk/src/crypto/store/indexeddb-crypto-store";
 import { LocalStorageCryptoStore } from "matrix-js-sdk/src/crypto/store/localStorage-crypto-store";
 import { MemoryCryptoStore } from "matrix-js-sdk/src/crypto/store/memory-crypto-store";
-import { createClient } from "matrix-js-sdk/src/matrix";
-import { ICreateClientOpts } from "matrix-js-sdk/src/matrix";
+import { createClient, ICreateClientOpts } from "matrix-js-sdk/src/matrix";
 import { ClientEvent } from "matrix-js-sdk/src/client";
 import { Visibility, Preset } from "matrix-js-sdk/src/@types/partials";
 import { ISyncStateData, SyncState } from "matrix-js-sdk/src/sync";
@@ -57,8 +56,8 @@ function waitForSync(client: MatrixClient) {
   return new Promise<void>((resolve, reject) => {
     const onSync = (
       state: SyncState,
-      _old: SyncState,
-      data: ISyncStateData
+      _old: SyncState | null,
+      data?: ISyncStateData
     ) => {
       if (state === "PREPARED") {
         resolve();
@@ -87,7 +86,7 @@ export async function initClient(
 ): Promise<MatrixClient> {
   await loadOlm();
 
-  let indexedDB: IDBFactory;
+  let indexedDB: IDBFactory | undefined;
   try {
     indexedDB = window.indexedDB;
   } catch (e) {}
@@ -247,7 +246,7 @@ export function sanitiseRoomNameInput(input: string): string {
  */
 export function roomNameFromRoomId(roomId: string): string {
   return roomId
-    .match(/([^:]+):.*$/)[1]
+    .match(/([^:]+):.*$/)![1]
     .substring(1)
     .split("-")
     .map((part) =>
@@ -262,7 +261,7 @@ export function isLocalRoomId(roomId: string, client: MatrixClient): boolean {
     return false;
   }
 
-  const parts = roomId.match(/[^:]+:(.*)$/);
+  const parts = roomId.match(/[^:]+:(.*)$/)!;
 
   if (parts.length < 2) {
     return false;
@@ -302,7 +301,7 @@ export async function createRoom(
         "org.matrix.msc3401.call.member": 0,
       },
       users: {
-        [client.getUserId()]: 100,
+        [client.getUserId()!]: 100,
       },
     },
   });
diff --git a/src/otel/OTelCall.ts b/src/otel/OTelCall.ts
index eae1f347..c7a7fb1a 100644
--- a/src/otel/OTelCall.ts
+++ b/src/otel/OTelCall.ts
@@ -61,46 +61,46 @@ export class OTelCall {
   }
 
   public dispose() {
-    this.call.peerConn.removeEventListener(
+    this.call.peerConn?.removeEventListener(
       "connectionstatechange",
       this.onCallConnectionStateChanged
     );
-    this.call.peerConn.removeEventListener(
+    this.call.peerConn?.removeEventListener(
       "signalingstatechange",
       this.onCallSignalingStateChanged
     );
-    this.call.peerConn.removeEventListener(
+    this.call.peerConn?.removeEventListener(
       "iceconnectionstatechange",
       this.onIceConnectionStateChanged
     );
-    this.call.peerConn.removeEventListener(
+    this.call.peerConn?.removeEventListener(
       "icegatheringstatechange",
       this.onIceGatheringStateChanged
     );
-    this.call.peerConn.removeEventListener(
+    this.call.peerConn?.removeEventListener(
       "icecandidateerror",
       this.onIceCandidateError
     );
   }
 
   private addCallPeerConnListeners = (): void => {
-    this.call.peerConn.addEventListener(
+    this.call.peerConn?.addEventListener(
       "connectionstatechange",
       this.onCallConnectionStateChanged
     );
-    this.call.peerConn.addEventListener(
+    this.call.peerConn?.addEventListener(
       "signalingstatechange",
       this.onCallSignalingStateChanged
     );
-    this.call.peerConn.addEventListener(
+    this.call.peerConn?.addEventListener(
       "iceconnectionstatechange",
       this.onIceConnectionStateChanged
     );
-    this.call.peerConn.addEventListener(
+    this.call.peerConn?.addEventListener(
       "icegatheringstatechange",
       this.onIceGatheringStateChanged
     );
-    this.call.peerConn.addEventListener(
+    this.call.peerConn?.addEventListener(
       "icecandidateerror",
       this.onIceCandidateError
     );
@@ -108,25 +108,25 @@ export class OTelCall {
 
   public onCallConnectionStateChanged = (): void => {
     this.span.addEvent("matrix.call.callConnectionStateChange", {
-      callConnectionState: this.call.peerConn.connectionState,
+      callConnectionState: this.call.peerConn?.connectionState,
     });
   };
 
   public onCallSignalingStateChanged = (): void => {
     this.span.addEvent("matrix.call.callSignalingStateChange", {
-      callSignalingState: this.call.peerConn.signalingState,
+      callSignalingState: this.call.peerConn?.signalingState,
     });
   };
 
   public onIceConnectionStateChanged = (): void => {
     this.span.addEvent("matrix.call.iceConnectionStateChange", {
-      iceConnectionState: this.call.peerConn.iceConnectionState,
+      iceConnectionState: this.call.peerConn?.iceConnectionState,
     });
   };
 
   public onIceGatheringStateChanged = (): void => {
     this.span.addEvent("matrix.call.iceGatheringStateChange", {
-      iceGatheringState: this.call.peerConn.iceGatheringState,
+      iceGatheringState: this.call.peerConn?.iceGatheringState,
     });
   };
 
diff --git a/src/otel/OTelGroupCallMembership.ts b/src/otel/OTelGroupCallMembership.ts
index fa1e164e..b60d5aa9 100644
--- a/src/otel/OTelGroupCallMembership.ts
+++ b/src/otel/OTelGroupCallMembership.ts
@@ -172,7 +172,7 @@ export class OTelGroupCallMembership {
       if (
         !userCalls ||
         !userCalls.has(callTrackingInfo.deviceId) ||
-        userCalls.get(callTrackingInfo.deviceId).callId !==
+        userCalls.get(callTrackingInfo.deviceId)?.callId !==
           callTrackingInfo.call.callId
       ) {
         callTrackingInfo.end();
@@ -420,7 +420,7 @@ export class OTelGroupCallMembership {
       ctx
     );
 
-    span.setAttribute("matrix.callId", callId);
+    span.setAttribute("matrix.callId", callId ?? "unknown");
     span.setAttribute(
       "matrix.opponentMemberId",
       report.opponentMemberId ? report.opponentMemberId : "unknown"
diff --git a/src/otel/otel.ts b/src/otel/otel.ts
index 8fc80805..d4629591 100644
--- a/src/otel/otel.ts
+++ b/src/otel/otel.ts
@@ -23,7 +23,6 @@ import { SemanticResourceAttributes } from "@opentelemetry/semantic-conventions"
 import { logger } from "matrix-js-sdk/src/logger";
 
 import { PosthogSpanProcessor } from "../analytics/PosthogSpanProcessor";
-import { Anonymity } from "../analytics/PosthogAnalytics";
 import { Config } from "../config/Config";
 import { RageshakeSpanProcessor } from "../analytics/RageshakeSpanProcessor";
 
@@ -34,8 +33,7 @@ let sharedInstance: ElementCallOpenTelemetry;
 export class ElementCallOpenTelemetry {
   private _provider: WebTracerProvider;
   private _tracer: Tracer;
-  private _anonymity: Anonymity;
-  private otlpExporter: OTLPTraceExporter;
+  private otlpExporter?: OTLPTraceExporter;
   public readonly rageshakeProcessor?: RageshakeSpanProcessor;
 
   static globalInit(): void {
@@ -100,7 +98,7 @@ export class ElementCallOpenTelemetry {
   }
 
   public dispose(): void {
-    opentelemetry.trace.setGlobalTracerProvider(null);
+    opentelemetry.trace.disable();
     this._provider?.shutdown();
   }
 
@@ -115,8 +113,4 @@ export class ElementCallOpenTelemetry {
   public get provider(): WebTracerProvider {
     return this._provider;
   }
-
-  public get anonymity(): Anonymity {
-    return this._anonymity;
-  }
 }
diff --git a/src/popover/PopoverMenu.tsx b/src/popover/PopoverMenu.tsx
index fc6fbc6e..faf7fd71 100644
--- a/src/popover/PopoverMenu.tsx
+++ b/src/popover/PopoverMenu.tsx
@@ -46,7 +46,7 @@ export const PopoverMenuTrigger = forwardRef<
     buttonRef
   );
 
-  const popoverRef = useRef();
+  const popoverRef = useRef(null);
 
   const { overlayProps } = useOverlayPosition({
     targetRef: buttonRef,
diff --git a/src/profile/useProfile.ts b/src/profile/useProfile.ts
index 9f880795..2281bb1e 100644
--- a/src/profile/useProfile.ts
+++ b/src/profile/useProfile.ts
@@ -21,10 +21,10 @@ import { FileType } from "matrix-js-sdk/src/http-api";
 import { useState, useCallback, useEffect } from "react";
 
 interface ProfileLoadState {
-  success?: boolean;
-  loading?: boolean;
-  displayName: string;
-  avatarUrl: string;
+  success: boolean;
+  loading: boolean;
+  displayName?: string;
+  avatarUrl?: string;
   error?: Error;
 }
 
@@ -38,23 +38,26 @@ type ProfileSaveCallback = ({
   removeAvatar: boolean;
 }) => Promise<void>;
 
-export function useProfile(client: MatrixClient) {
-  const [{ loading, displayName, avatarUrl, error, success }, setState] =
+export function useProfile(client: MatrixClient | undefined) {
+  const [{ success, loading, displayName, avatarUrl, error }, setState] =
     useState<ProfileLoadState>(() => {
-      const user = client?.getUser(client.getUserId());
+      let user: User | undefined = undefined;
+      if (client) {
+        user = client.getUser(client.getUserId()!) ?? undefined;
+      }
 
       return {
         success: false,
         loading: false,
         displayName: user?.rawDisplayName,
         avatarUrl: user?.avatarUrl,
-        error: null,
+        error: undefined,
       };
     });
 
   useEffect(() => {
     const onChangeUser = (
-      _event: MatrixEvent,
+      _event: MatrixEvent | undefined,
       { displayName, avatarUrl }: User
     ) => {
       setState({
@@ -62,17 +65,16 @@ export function useProfile(client: MatrixClient) {
         loading: false,
         displayName,
         avatarUrl,
-        error: null,
+        error: undefined,
       });
     };
 
-    let user: User;
-
+    let user: User | null;
     if (client) {
-      const userId = client.getUserId();
+      const userId = client.getUserId()!;
       user = client.getUser(userId);
-      user.on(UserEvent.DisplayName, onChangeUser);
-      user.on(UserEvent.AvatarUrl, onChangeUser);
+      user?.on(UserEvent.DisplayName, onChangeUser);
+      user?.on(UserEvent.AvatarUrl, onChangeUser);
     }
 
     return () => {
@@ -89,7 +91,7 @@ export function useProfile(client: MatrixClient) {
         setState((prev) => ({
           ...prev,
           loading: true,
-          error: null,
+          error: undefined,
           success: false,
         }));
 
@@ -110,7 +112,9 @@ export function useProfile(client: MatrixClient) {
           setState((prev) => ({
             ...prev,
             displayName,
-            avatarUrl: removeAvatar ? null : mxcAvatarUrl ?? prev.avatarUrl,
+            avatarUrl: removeAvatar
+              ? undefined
+              : mxcAvatarUrl ?? prev.avatarUrl,
             loading: false,
             success: true,
           }));
diff --git a/src/room/GridLayoutMenu.tsx b/src/room/GridLayoutMenu.tsx
index dac8f465..1722f20a 100644
--- a/src/room/GridLayoutMenu.tsx
+++ b/src/room/GridLayoutMenu.tsx
@@ -38,6 +38,15 @@ export function GridLayoutMenu({ layout, setLayout }: Props) {
   const { t } = useTranslation();
   const tooltip = useCallback(() => t("Change layout"), [t]);
 
+  const onAction = useCallback(
+    (key: React.Key) => {
+      setLayout(key.toString() as Layout);
+    },
+    [setLayout]
+  );
+
+  const onClose = useCallback(() => {}, []);
+
   return (
     <PopoverMenuTrigger placement="bottom right">
       <TooltipTrigger tooltip={tooltip}>
@@ -46,7 +55,12 @@ export function GridLayoutMenu({ layout, setLayout }: Props) {
         </Button>
       </TooltipTrigger>
       {(props: JSX.IntrinsicAttributes) => (
-        <Menu {...props} label={t("Grid layout menu")} onAction={setLayout}>
+        <Menu
+          {...props}
+          label={t("Grid layout menu")}
+          onAction={onAction}
+          onClose={onClose}
+        >
           <Item key="freedom" textValue={t("Freedom")}>
             <FreedomIcon />
             <span>Freedom</span>
diff --git a/src/room/GroupCallInspector.tsx b/src/room/GroupCallInspector.tsx
index 69986e1e..d3df2c5b 100644
--- a/src/room/GroupCallInspector.tsx
+++ b/src/room/GroupCallInspector.tsx
@@ -1,3 +1,6 @@
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-nocheck
+
 /*
 Copyright 2022 New Vector Ltd
 
@@ -70,7 +73,7 @@ const defaultCollapsedFields = [
 ];
 
 function shouldCollapse({ name }: CollapsedFieldProps) {
-  return defaultCollapsedFields.includes(name);
+  return name ? defaultCollapsedFields.includes(name) : false;
 }
 
 function getUserName(userId: string) {
@@ -196,7 +199,7 @@ export function SequenceDiagramViewer({
   onSelectUserId,
   events,
 }: SequenceDiagramViewerProps) {
-  const mermaidElRef = useRef<HTMLDivElement>();
+  const mermaidElRef = useRef<HTMLDivElement>(null);
 
   useEffect(() => {
     mermaid.initialize({
@@ -217,6 +220,7 @@ export function SequenceDiagramViewer({
     `;
 
     mermaid.mermaidAPI.render("mermaid", graphDefinition, (svgCode: string) => {
+      if (!mermaidElRef.current) return;
       mermaidElRef.current.innerHTML = svgCode;
     });
   }, [events, localUserId, selectedUserId]);
@@ -228,7 +232,7 @@ export function SequenceDiagramViewer({
           className={styles.selectInput}
           label="Remote User"
           selectedKey={selectedUserId}
-          onSelectionChange={onSelectUserId}
+          onSelectionChange={(key) => onSelectUserId(key.toString())}
         >
           {remoteUserIds.map((userId) => (
             <Item key={userId}>{userId}</Item>
@@ -498,7 +502,7 @@ export function GroupCallInspector({
   return (
     <Resizable
       enable={{ top: true }}
-      defaultSize={{ height: 200, width: undefined }}
+      defaultSize={{ height: 200, width: 0 }}
       className={styles.inspector}
     >
       <div className={styles.toolbar}>
@@ -507,15 +511,19 @@ export function GroupCallInspector({
         </button>
         <button onClick={() => setCurrentTab("inspector")}>Inspector</button>
       </div>
-      {currentTab === "sequence-diagrams" && (
-        <SequenceDiagramViewer
-          localUserId={state.localUserId}
-          selectedUserId={selectedUserId}
-          onSelectUserId={setSelectedUserId}
-          remoteUserIds={state.remoteUserIds}
-          events={state.eventsByUserId[selectedUserId]}
-        />
-      )}
+      {currentTab === "sequence-diagrams" &&
+        state.localUserId &&
+        selectedUserId &&
+        state.eventsByUserId &&
+        state.remoteUserIds && (
+          <SequenceDiagramViewer
+            localUserId={state.localUserId}
+            selectedUserId={selectedUserId}
+            onSelectUserId={setSelectedUserId}
+            remoteUserIds={state.remoteUserIds}
+            events={state.eventsByUserId[selectedUserId]}
+          />
+        )}
       {currentTab === "inspector" && (
         <ReactJson
           theme="monokai"
diff --git a/src/room/GroupCallLoader.tsx b/src/room/GroupCallLoader.tsx
index f1161553..ca52a163 100644
--- a/src/room/GroupCallLoader.tsx
+++ b/src/room/GroupCallLoader.tsx
@@ -21,7 +21,6 @@ import { useTranslation } from "react-i18next";
 
 import { useLoadGroupCall } from "./useLoadGroupCall";
 import { ErrorView, FullScreenView } from "../FullScreenView";
-import { usePageTitle } from "../usePageTitle";
 
 interface Props {
   client: MatrixClient;
@@ -39,26 +38,23 @@ export function GroupCallLoader({
   createPtt,
 }: Props): JSX.Element {
   const { t } = useTranslation();
-  const { loading, error, groupCall } = useLoadGroupCall(
+  const groupCallState = useLoadGroupCall(
     client,
     roomIdOrAlias,
     viaServers,
     createPtt
   );
 
-  usePageTitle(groupCall ? groupCall.room.name : t("Loading…"));
-
-  if (loading) {
-    return (
-      <FullScreenView>
-        <h1>{t("Loading…")}</h1>
-      </FullScreenView>
-    );
+  switch (groupCallState.kind) {
+    case "loading":
+      return (
+        <FullScreenView>
+          <h1>{t("Loading…")}</h1>
+        </FullScreenView>
+      );
+    case "loaded":
+      return <>{children(groupCallState.groupCall)}</>;
+    case "failed":
+      return <ErrorView error={groupCallState.error} />;
   }
-
-  if (error) {
-    return <ErrorView error={error} />;
-  }
-
-  return <>{children(groupCall)}</>;
 }
diff --git a/src/room/GroupCallView.tsx b/src/room/GroupCallView.tsx
index 1ed4726c..9afc2ec3 100644
--- a/src/room/GroupCallView.tsx
+++ b/src/room/GroupCallView.tsx
@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useMemo, useState } from "react";
 import { useHistory } from "react-router-dom";
 import { GroupCall, GroupCallState } from "matrix-js-sdk/src/webrtc/groupCall";
 import { MatrixClient } from "matrix-js-sdk/src/client";
@@ -50,7 +50,6 @@ interface Props {
   isEmbedded: boolean;
   preload: boolean;
   hideHeader: boolean;
-  roomIdOrAlias: string;
   groupCall: GroupCall;
 }
 
@@ -60,7 +59,6 @@ export function GroupCallView({
   isEmbedded,
   preload,
   hideHeader,
-  roomIdOrAlias,
   groupCall,
 }: Props) {
   const {
@@ -83,13 +81,14 @@ export function GroupCallView({
   }, [groupCall]);
 
   const { displayName, avatarUrl } = useProfile(client);
-
-  const matrixInfo: MatrixInfo = {
-    displayName,
-    avatarUrl,
-    roomName: groupCall.room.name,
-    roomIdOrAlias,
-  };
+  const matrixInfo = useMemo((): MatrixInfo => {
+    return {
+      displayName: displayName!,
+      avatarUrl: avatarUrl!,
+      roomId: groupCall.room.roomId,
+      roomName: groupCall.room.name,
+    };
+  }, [displayName, avatarUrl, groupCall]);
 
   useEffect(() => {
     if (widget && preload) {
@@ -140,14 +139,14 @@ export function GroupCallView({
         PosthogAnalytics.instance.eventCallStarted.track(groupCall.groupCallId);
 
         await Promise.all([
-          widget.api.setAlwaysOnScreen(true),
-          widget.api.transport.reply(ev.detail, {}),
+          widget!.api.setAlwaysOnScreen(true),
+          widget!.api.transport.reply(ev.detail, {}),
         ]);
       };
 
       widget.lazyActions.on(ElementWidgetActions.JoinCall, onJoin);
       return () => {
-        widget.lazyActions.off(ElementWidgetActions.JoinCall, onJoin);
+        widget!.lazyActions.off(ElementWidgetActions.JoinCall, onJoin);
       };
     }
   }, [groupCall, preload, enter]);
@@ -206,12 +205,12 @@ export function GroupCallView({
     if (widget && state === GroupCallState.Entered) {
       const onHangup = async (ev: CustomEvent<IWidgetApiRequest>) => {
         leave();
-        await widget.api.transport.reply(ev.detail, {});
-        widget.api.setAlwaysOnScreen(false);
+        await widget!.api.transport.reply(ev.detail, {});
+        widget!.api.setAlwaysOnScreen(false);
       };
       widget.lazyActions.once(ElementWidgetActions.HangupCall, onHangup);
       return () => {
-        widget.lazyActions.off(ElementWidgetActions.HangupCall, onHangup);
+        widget!.lazyActions.off(ElementWidgetActions.HangupCall, onHangup);
       };
     }
   }, [groupCall, state, leave]);
@@ -222,7 +221,7 @@ export function GroupCallView({
 
   const livekitServiceURL =
     groupCall.foci[0]?.livekitServiceUrl ??
-    Config.get().livekit.livekit_service_url;
+    Config.get().livekit?.livekit_service_url;
   if (!livekitServiceURL) {
     return <ErrorView error={new Error("No livekit_service_url defined")} />;
   }
@@ -243,7 +242,6 @@ export function GroupCallView({
           onLeave={onLeave}
           unencryptedEventsFromUsers={unencryptedEventsFromUsers}
           hideHeader={hideHeader}
-          matrixInfo={matrixInfo}
           userChoices={userChoices}
           otelGroupCallMembership={otelGroupCallMembership}
         />
diff --git a/src/room/InCallView.tsx b/src/room/InCallView.tsx
index 2425266d..b8284975 100644
--- a/src/room/InCallView.tsx
+++ b/src/room/InCallView.tsx
@@ -68,17 +68,15 @@ import { ElementWidgetActions, widget } from "../widget";
 import { GridLayoutMenu } from "./GridLayoutMenu";
 import { GroupCallInspector } from "./GroupCallInspector";
 import styles from "./InCallView.module.css";
-import { MatrixInfo } from "./VideoPreview";
 import { useJoinRule } from "./useJoinRule";
 import { ParticipantInfo } from "./useGroupCall";
-import { ItemData, TileContent } from "../video-grid/VideoTile";
+import { ItemData, TileContent, VideoTile } from "../video-grid/VideoTile";
 import { NewVideoGrid } from "../video-grid/NewVideoGrid";
 import { OTelGroupCallMembership } from "../otel/OTelGroupCallMembership";
 import { SettingsModal } from "../settings/SettingsModal";
 import { InviteModal } from "./InviteModal";
 import { useRageshakeRequestModal } from "../settings/submit-rageshake";
 import { RageshakeRequestModal } from "./RageshakeRequestModal";
-import { VideoTile } from "../video-grid/VideoTile";
 import { UserChoices, useLiveKit } from "../livekit/useLiveKit";
 import { useMediaDevicesSwitcher } from "../livekit/useMediaDevicesSwitcher";
 import { useFullscreen } from "./useFullscreen";
@@ -100,12 +98,14 @@ export function ActiveCall(props: ActiveCallProps) {
   const sfuConfig = useSFUConfig();
   const livekitRoom = useLiveKit(props.userChoices, sfuConfig);
 
+  if (!livekitRoom) {
+    return null;
+  }
+
   return (
-    livekitRoom && (
-      <RoomContext.Provider value={livekitRoom}>
-        <InCallView {...props} livekitRoom={livekitRoom} />
-      </RoomContext.Provider>
-    )
+    <RoomContext.Provider value={livekitRoom}>
+      <InCallView {...props} livekitRoom={livekitRoom} />
+    </RoomContext.Provider>
   );
 }
 
@@ -117,8 +117,7 @@ export interface InCallViewProps {
   onLeave: () => void;
   unencryptedEventsFromUsers: Set<string>;
   hideHeader: boolean;
-  matrixInfo: MatrixInfo;
-  otelGroupCallMembership: OTelGroupCallMembership;
+  otelGroupCallMembership?: OTelGroupCallMembership;
 }
 
 export function InCallView({
@@ -129,7 +128,6 @@ export function InCallView({
   onLeave,
   unencryptedEventsFromUsers,
   hideHeader,
-  matrixInfo,
   otelGroupCallMembership,
 }: InCallViewProps) {
   const { t } = useTranslation();
@@ -203,11 +201,11 @@ export function InCallView({
     if (widget) {
       const onTileLayout = async (ev: CustomEvent<IWidgetApiRequest>) => {
         setLayout("freedom");
-        await widget.api.transport.reply(ev.detail, {});
+        await widget!.api.transport.reply(ev.detail, {});
       };
       const onSpotlightLayout = async (ev: CustomEvent<IWidgetApiRequest>) => {
         setLayout("spotlight");
-        await widget.api.transport.reply(ev.detail, {});
+        await widget!.api.transport.reply(ev.detail, {});
       };
 
       widget.lazyActions.on(ElementWidgetActions.TileLayout, onTileLayout);
@@ -217,8 +215,8 @@ export function InCallView({
       );
 
       return () => {
-        widget.lazyActions.off(ElementWidgetActions.TileLayout, onTileLayout);
-        widget.lazyActions.off(
+        widget!.lazyActions.off(ElementWidgetActions.TileLayout, onTileLayout);
+        widget!.lazyActions.off(
           ElementWidgetActions.SpotlightLayout,
           onSpotlightLayout
         );
@@ -396,7 +394,7 @@ export function InCallView({
       {!hideHeader && maximisedParticipant === null && (
         <Header>
           <LeftNav>
-            <RoomHeaderInfo roomName={matrixInfo.roomName} />
+            <RoomHeaderInfo roomName={groupCall.room.name} />
             <VersionMismatchWarning
               users={unencryptedEventsFromUsers}
               room={groupCall.room}
@@ -416,16 +414,18 @@ export function InCallView({
         {renderContent()}
         {footer}
       </div>
-      <GroupCallInspector
-        client={client}
-        groupCall={groupCall}
-        otelGroupCallMembership={otelGroupCallMembership}
-        show={showInspector}
-      />
+      {otelGroupCallMembership && (
+        <GroupCallInspector
+          client={client}
+          groupCall={groupCall}
+          otelGroupCallMembership={otelGroupCallMembership}
+          show={showInspector}
+        />
+      )}
       {rageshakeRequestModalState.isOpen && !noControls && (
         <RageshakeRequestModal
           {...rageshakeRequestModalProps}
-          roomIdOrAlias={matrixInfo.roomIdOrAlias}
+          roomId={groupCall.room.roomId}
         />
       )}
       {settingsModalState.isOpen && (
@@ -437,10 +437,7 @@ export function InCallView({
         />
       )}
       {inviteModalState.isOpen && (
-        <InviteModal
-          roomIdOrAlias={matrixInfo.roomIdOrAlias}
-          {...inviteModalProps}
-        />
+        <InviteModal roomId={groupCall.room.roomId} {...inviteModalProps} />
       )}
     </div>
   );
diff --git a/src/room/InviteModal.tsx b/src/room/InviteModal.tsx
index 781f2ed6..ce17ac18 100644
--- a/src/room/InviteModal.tsx
+++ b/src/room/InviteModal.tsx
@@ -23,10 +23,10 @@ import { getRoomUrl } from "../matrix-utils";
 import styles from "./InviteModal.module.css";
 
 interface Props extends Omit<ModalProps, "title" | "children"> {
-  roomIdOrAlias: string;
+  roomId: string;
 }
 
-export const InviteModal: FC<Props> = ({ roomIdOrAlias, ...rest }) => {
+export const InviteModal: FC<Props> = ({ roomId, ...rest }) => {
   const { t } = useTranslation();
 
   return (
@@ -40,7 +40,7 @@ export const InviteModal: FC<Props> = ({ roomIdOrAlias, ...rest }) => {
         <p>{t("Copy and share this call link")}</p>
         <CopyButton
           className={styles.copyButton}
-          value={getRoomUrl(roomIdOrAlias)}
+          value={getRoomUrl(roomId)}
           data-testid="modal_inviteLink"
         />
       </ModalContent>
diff --git a/src/room/LobbyView.tsx b/src/room/LobbyView.tsx
index 4224c0cc..0f07ae7d 100644
--- a/src/room/LobbyView.tsx
+++ b/src/room/LobbyView.tsx
@@ -39,7 +39,7 @@ export function LobbyView(props: Props) {
   const { t } = useTranslation();
   useLocationNavigation();
 
-  const joinCallButtonRef = useRef<HTMLButtonElement>();
+  const joinCallButtonRef = useRef<HTMLButtonElement>(null);
   useEffect(() => {
     if (joinCallButtonRef.current) {
       joinCallButtonRef.current.focus();
@@ -81,7 +81,7 @@ export function LobbyView(props: Props) {
             <Body>Or</Body>
             <CopyButton
               variant="secondaryCopy"
-              value={getRoomUrl(props.matrixInfo.roomName)}
+              value={getRoomUrl(props.matrixInfo.roomId)}
               className={styles.copyButton}
               copiedMessage={t("Call link copied")}
               data-testid="lobby_inviteLink"
diff --git a/src/room/RageshakeRequestModal.tsx b/src/room/RageshakeRequestModal.tsx
index 2e08903d..479ff280 100644
--- a/src/room/RageshakeRequestModal.tsx
+++ b/src/room/RageshakeRequestModal.tsx
@@ -25,13 +25,13 @@ import { Body } from "../typography/Typography";
 
 interface Props extends Omit<ModalProps, "title" | "children"> {
   rageshakeRequestId: string;
-  roomIdOrAlias: string;
+  roomId: string;
   onClose: () => void;
 }
 
 export const RageshakeRequestModal: FC<Props> = ({
   rageshakeRequestId,
-  roomIdOrAlias,
+  roomId,
   ...rest
 }) => {
   const { t } = useTranslation();
@@ -57,7 +57,7 @@ export const RageshakeRequestModal: FC<Props> = ({
               submitRageshake({
                 sendLogs: true,
                 rageshakeRequestId,
-                roomId: roomIdOrAlias, // Possibly not a room ID, but oh well
+                roomId,
               })
             }
             disabled={sending}
diff --git a/src/room/RoomAuthView.tsx b/src/room/RoomAuthView.tsx
index 8a50d310..28c1ec6c 100644
--- a/src/room/RoomAuthView.tsx
+++ b/src/room/RoomAuthView.tsx
@@ -36,6 +36,8 @@ export function RoomAuthView() {
     useRegisterPasswordlessUser();
 
   const onSubmit = useCallback(
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     (e) => {
       e.preventDefault();
       const data = new FormData(e.target);
diff --git a/src/room/RoomPage.tsx b/src/room/RoomPage.tsx
index 4974d343..afd7beca 100644
--- a/src/room/RoomPage.tsx
+++ b/src/room/RoomPage.tsx
@@ -18,7 +18,7 @@ import { FC, useEffect, useState, useCallback } from "react";
 import { useTranslation } from "react-i18next";
 
 import type { GroupCall } from "matrix-js-sdk/src/webrtc/groupCall";
-import { useClient } from "../ClientContext";
+import { useClientLegacy } from "../ClientContext";
 import { ErrorView, LoadingView } from "../FullScreenView";
 import { RoomAuthView } from "./RoomAuthView";
 import { GroupCallLoader } from "./GroupCallLoader";
@@ -30,8 +30,6 @@ import { useOptInAnalytics } from "../settings/useSetting";
 
 export const RoomPage: FC = () => {
   const { t } = useTranslation();
-  const { loading, isAuthenticated, error, client, isPasswordlessUser } =
-    useClient();
 
   const {
     roomAlias,
@@ -52,39 +50,41 @@ export const RoomPage: FC = () => {
 
   useEffect(() => {
     // During the beta, opt into analytics by default
-    if (optInAnalytics === null) setOptInAnalytics(true);
+    if (optInAnalytics === null && setOptInAnalytics) setOptInAnalytics(true);
   }, [optInAnalytics, setOptInAnalytics]);
 
+  const { loading, authenticated, client, error, passwordlessUser } =
+    useClientLegacy();
+
   useEffect(() => {
     // If we've finished loading, are not already authed and we've been given a display name as
     // a URL param, automatically register a passwordless user
-    if (!loading && !isAuthenticated && displayName) {
+    if (!loading && !authenticated && displayName) {
       setIsRegistering(true);
       registerPasswordlessUser(displayName).finally(() => {
         setIsRegistering(false);
       });
     }
   }, [
-    isAuthenticated,
+    loading,
+    authenticated,
     displayName,
     setIsRegistering,
     registerPasswordlessUser,
-    loading,
   ]);
 
   const groupCallView = useCallback(
     (groupCall: GroupCall) => (
       <GroupCallView
-        client={client}
-        roomIdOrAlias={roomIdOrAlias}
+        client={client!}
         groupCall={groupCall}
-        isPasswordlessUser={isPasswordlessUser}
+        isPasswordlessUser={passwordlessUser}
         isEmbedded={isEmbedded}
         preload={preload}
         hideHeader={hideHeader}
       />
     ),
-    [client, roomIdOrAlias, isPasswordlessUser, isEmbedded, preload, hideHeader]
+    [client, passwordlessUser, isEmbedded, preload, hideHeader]
   );
 
   if (loading || isRegistering) {
@@ -95,7 +95,7 @@ export const RoomPage: FC = () => {
     return <ErrorView error={error} />;
   }
 
-  if (!isAuthenticated) {
+  if (!client) {
     return <RoomAuthView />;
   }
 
diff --git a/src/room/VideoPreview.tsx b/src/room/VideoPreview.tsx
index beeea010..f76c8e5b 100644
--- a/src/room/VideoPreview.tsx
+++ b/src/room/VideoPreview.tsx
@@ -34,8 +34,8 @@ import { useDefaultDevices } from "../settings/useSetting";
 export type MatrixInfo = {
   displayName: string;
   avatarUrl: string;
+  roomId: string;
   roomName: string;
-  roomIdOrAlias: string;
 };
 
 interface Props {
@@ -209,7 +209,7 @@ export function VideoPreview({ matrixInfo, onUserChoicesChanged }: Props) {
           <SettingsButton onPress={openSettings} />
         </div>
       </>
-      {settingsModalState.isOpen && (
+      {settingsModalState.isOpen && client && (
         <SettingsModal
           client={client}
           mediaDevicesSwitcher={mediaSwitcher}
diff --git a/src/room/useGroupCall.ts b/src/room/useGroupCall.ts
index b58b2da7..63e19443 100644
--- a/src/room/useGroupCall.ts
+++ b/src/room/useGroupCall.ts
@@ -58,12 +58,12 @@ export interface ParticipantInfo {
 
 interface UseGroupCallReturnType {
   state: GroupCallState;
-  localCallFeed: CallFeed;
-  activeSpeaker: CallFeed | null;
+  localCallFeed?: CallFeed;
+  activeSpeaker?: CallFeed;
   userMediaFeeds: CallFeed[];
   microphoneMuted: boolean;
   localVideoMuted: boolean;
-  error: TranslatedError | null;
+  error?: TranslatedError;
   initLocalCallFeed: () => void;
   enter: () => Promise<void>;
   leave: () => void;
@@ -74,23 +74,21 @@ interface UseGroupCallReturnType {
   requestingScreenshare: boolean;
   isScreensharing: boolean;
   screenshareFeeds: CallFeed[];
-  localDesktopCapturerSourceId: string; // XXX: This looks unused?
   participants: Map<RoomMember, Map<string, ParticipantInfo>>;
   hasLocalParticipant: boolean;
   unencryptedEventsFromUsers: Set<string>;
-  otelGroupCallMembership: OTelGroupCallMembership;
+  otelGroupCallMembership?: OTelGroupCallMembership;
 }
 
 interface State {
   state: GroupCallState;
-  localCallFeed: CallFeed;
-  activeSpeaker: CallFeed | null;
+  localCallFeed?: CallFeed;
+  activeSpeaker?: CallFeed;
   userMediaFeeds: CallFeed[];
-  error: TranslatedError | null;
+  error?: TranslatedError;
   microphoneMuted: boolean;
   localVideoMuted: boolean;
   screenshareFeeds: CallFeed[];
-  localDesktopCapturerSourceId: string;
   isScreensharing: boolean;
   requestingScreenshare: boolean;
   participants: Map<RoomMember, Map<string, ParticipantInfo>>;
@@ -101,7 +99,7 @@ interface State {
 // level so that it doesn't pop in & out of existence as react mounts & unmounts
 // components. The right solution is probably for this to live in the js-sdk and have
 // the same lifetime as groupcalls themselves.
-let groupCallOTelMembership: OTelGroupCallMembership;
+let groupCallOTelMembership: OTelGroupCallMembership | undefined;
 let groupCallOTelMembershipGroupCallId: string;
 
 function getParticipants(
@@ -159,7 +157,6 @@ export function useGroupCall(
       localVideoMuted,
       isScreensharing,
       screenshareFeeds,
-      localDesktopCapturerSourceId,
       participants,
       hasLocalParticipant,
       requestingScreenshare,
@@ -167,15 +164,11 @@ export function useGroupCall(
     setState,
   ] = useState<State>({
     state: GroupCallState.LocalCallFeedUninitialized,
-    localCallFeed: null,
-    activeSpeaker: null,
     userMediaFeeds: [],
-    error: null,
     microphoneMuted: false,
     localVideoMuted: false,
     isScreensharing: false,
     screenshareFeeds: [],
-    localDesktopCapturerSourceId: null,
     requestingScreenshare: false,
     participants: new Map(),
     hasLocalParticipant: false,
@@ -248,12 +241,11 @@ export function useGroupCall(
       updateState({
         state: groupCall.state,
         localCallFeed: groupCall.localCallFeed,
-        activeSpeaker: groupCall.activeSpeaker ?? null,
+        activeSpeaker: groupCall.activeSpeaker,
         userMediaFeeds: [...groupCall.userMediaFeeds],
         microphoneMuted: groupCall.isMicrophoneMuted(),
         localVideoMuted: groupCall.isLocalVideoMuted(),
         isScreensharing: groupCall.isScreensharing(),
-        localDesktopCapturerSourceId: groupCall.localDesktopCapturerSourceId,
         screenshareFeeds: [...groupCall.screenshareFeeds],
       });
     }
@@ -303,7 +295,7 @@ export function useGroupCall(
 
     function onActiveSpeakerChanged(activeSpeaker: CallFeed | undefined): void {
       updateState({
-        activeSpeaker: activeSpeaker ?? null,
+        activeSpeaker: activeSpeaker,
       });
     }
 
@@ -319,12 +311,11 @@ export function useGroupCall(
 
     function onLocalScreenshareStateChanged(
       isScreensharing: boolean,
-      _localScreenshareFeed: CallFeed,
-      localDesktopCapturerSourceId: string
+      _localScreenshareFeed?: CallFeed,
+      localDesktopCapturerSourceId?: string
     ): void {
       updateState({
         isScreensharing,
-        localDesktopCapturerSourceId,
       });
     }
 
@@ -405,15 +396,14 @@ export function useGroupCall(
     );
 
     updateState({
-      error: null,
+      error: undefined,
       state: groupCall.state,
       localCallFeed: groupCall.localCallFeed,
-      activeSpeaker: groupCall.activeSpeaker ?? null,
+      activeSpeaker: groupCall.activeSpeaker,
       userMediaFeeds: [...groupCall.userMediaFeeds],
       microphoneMuted: groupCall.isMicrophoneMuted(),
       localVideoMuted: groupCall.isLocalVideoMuted(),
       isScreensharing: groupCall.isScreensharing(),
-      localDesktopCapturerSourceId: groupCall.localDesktopCapturerSourceId,
       screenshareFeeds: [...groupCall.screenshareFeeds],
       participants: getParticipants(groupCall),
       hasLocalParticipant: groupCall.hasLocalParticipant(),
@@ -516,7 +506,7 @@ export function useGroupCall(
   }, [groupCall]);
 
   const setMicrophoneMuted = useCallback(
-    (setMuted) => {
+    (setMuted: boolean) => {
       groupCall.setMicrophoneMuted(setMuted);
       groupCallOTelMembership?.onSetMicrophoneMuted(setMuted);
       PosthogAnalytics.instance.eventMuteMicrophone.track(
@@ -575,7 +565,7 @@ export function useGroupCall(
         desktopCapturerSourceId: data.desktopCapturerSourceId as string,
         audio: !data.desktopCapturerSourceId,
       });
-      await widget.api.transport.reply(ev.detail, {});
+      await widget?.api.transport.reply(ev.detail, {});
     },
     [groupCall, updateState]
   );
@@ -584,7 +574,7 @@ export function useGroupCall(
     async (ev: CustomEvent<IWidgetApiRequest>) => {
       updateState({ requestingScreenshare: false });
       await groupCall.setScreensharingEnabled(false);
-      await widget.api.transport.reply(ev.detail, {});
+      await widget?.api.transport.reply(ev.detail, {});
     },
     [groupCall, updateState]
   );
@@ -601,11 +591,11 @@ export function useGroupCall(
       );
 
       return () => {
-        widget.lazyActions.off(
+        widget?.lazyActions.off(
           ElementWidgetActions.ScreenshareStart,
           onScreenshareStart
         );
-        widget.lazyActions.off(
+        widget?.lazyActions.off(
           ElementWidgetActions.ScreenshareStop,
           onScreenshareStop
         );
@@ -644,7 +634,6 @@ export function useGroupCall(
     requestingScreenshare,
     isScreensharing,
     screenshareFeeds,
-    localDesktopCapturerSourceId,
     participants,
     hasLocalParticipant,
     unencryptedEventsFromUsers,
diff --git a/src/room/useLoadGroupCall.ts b/src/room/useLoadGroupCall.ts
index 57175537..4aa82f11 100644
--- a/src/room/useLoadGroupCall.ts
+++ b/src/room/useLoadGroupCall.ts
@@ -34,8 +34,26 @@ import { widget } from "../widget";
 
 const STATS_COLLECT_INTERVAL_TIME_MS = 10000;
 
+export type GroupCallLoaded = {
+  kind: "loaded";
+  groupCall: GroupCall;
+};
+
+export type GroupCallLoadFailed = {
+  kind: "failed";
+  error: Error;
+};
+
+export type GroupCallLoading = {
+  kind: "loading";
+};
+
+export type GroupCallStatus =
+  | GroupCallLoaded
+  | GroupCallLoadFailed
+  | GroupCallLoading;
+
 export interface GroupCallLoadState {
-  loading: boolean;
   error?: Error;
   groupCall?: GroupCall;
 }
@@ -45,13 +63,11 @@ export const useLoadGroupCall = (
   roomIdOrAlias: string,
   viaServers: string[],
   createPtt: boolean
-): GroupCallLoadState => {
+): GroupCallStatus => {
   const { t } = useTranslation();
-  const [state, setState] = useState<GroupCallLoadState>({ loading: true });
+  const [state, setState] = useState<GroupCallStatus>({ kind: "loading" });
 
   useEffect(() => {
-    setState({ loading: true });
-
     const fetchOrCreateRoom = async (): Promise<Room> => {
       try {
         // We lowercase the localpart when we create the room, so we must lowercase
@@ -74,8 +90,14 @@ export const useLoadGroupCall = (
       } catch (error) {
         if (
           isLocalRoomId(roomIdOrAlias, client) &&
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          // @ts-ignore
           (error.errcode === "M_NOT_FOUND" ||
+            // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+            // @ts-ignore
             (error.message &&
+              // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+              // @ts-ignore
               error.message.indexOf("Failed to fetch alias") !== -1))
         ) {
           // The room doesn't exist, but we can create it
@@ -86,7 +108,7 @@ export const useLoadGroupCall = (
           );
           // likewise, wait for the room
           await client.waitUntilRoomReadyForGroupCalls(roomId);
-          return client.getRoom(roomId);
+          return client.getRoom(roomId)!;
         } else {
           throw error;
         }
@@ -170,12 +192,8 @@ export const useLoadGroupCall = (
 
     waitForClientSyncing()
       .then(fetchOrCreateGroupCall)
-      .then((groupCall) =>
-        setState((prevState) => ({ ...prevState, loading: false, groupCall }))
-      )
-      .catch((error) =>
-        setState((prevState) => ({ ...prevState, loading: false, error }))
-      );
+      .then((groupCall) => setState({ kind: "loaded", groupCall }))
+      .catch((error) => setState({ kind: "failed", error }));
   }, [client, roomIdOrAlias, viaServers, createPtt, t]);
 
   return state;
diff --git a/src/room/usePageUnload.ts b/src/room/usePageUnload.ts
index 271704ae..a6db816d 100644
--- a/src/room/usePageUnload.ts
+++ b/src/room/usePageUnload.ts
@@ -55,14 +55,22 @@ export function usePageUnload(callback: () => void) {
     // iOS doesn't fire beforeunload event, so leave the call when you hide the page.
     if (isIOS()) {
       window.addEventListener("pagehide", onBeforeUnload);
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       document.addEventListener("visibilitychange", onBeforeUnload);
     }
 
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     window.addEventListener("beforeunload", onBeforeUnload);
 
     return () => {
       window.removeEventListener("pagehide", onBeforeUnload);
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       document.removeEventListener("visibilitychange", onBeforeUnload);
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       window.removeEventListener("beforeunload", onBeforeUnload);
       clearTimeout(pageVisibilityTimeout);
     };
diff --git a/src/settings/FeedbackSettingsTab.tsx b/src/settings/FeedbackSettingsTab.tsx
index 18e5073e..e1af3fcb 100644
--- a/src/settings/FeedbackSettingsTab.tsx
+++ b/src/settings/FeedbackSettingsTab.tsx
@@ -35,6 +35,8 @@ export function FeedbackSettingsTab({ roomId }: Props) {
   const sendRageshakeRequest = useRageshakeRequest();
 
   const onSubmitFeedback = useCallback(
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     (e) => {
       e.preventDefault();
       const data = new FormData(e.target);
diff --git a/src/settings/ProfileSettingsTab.tsx b/src/settings/ProfileSettingsTab.tsx
index edb78738..8de8dd52 100644
--- a/src/settings/ProfileSettingsTab.tsx
+++ b/src/settings/ProfileSettingsTab.tsx
@@ -59,8 +59,14 @@ export function ProfileSettingsTab({ client }: Props) {
             ? displayNameDataEntry
             : displayNameDataEntry?.name ?? null;
 
+        if (!displayName) {
+          return;
+        }
+
         saveProfile({
           displayName,
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          // @ts-ignore
           avatar: avatar && avatarSize > 0 ? avatar : undefined,
           removeAvatar: removeAvatar.current && (!avatar || avatarSize === 0),
         });
@@ -71,14 +77,16 @@ export function ProfileSettingsTab({ client }: Props) {
   return (
     <form onChange={onFormChange} ref={formRef} className={styles.content}>
       <FieldRow className={styles.avatarFieldRow}>
-        <AvatarInputField
-          id="avatar"
-          name="avatar"
-          label={t("Avatar")}
-          avatarUrl={avatarUrl}
-          displayName={displayName}
-          onRemoveAvatar={onRemoveAvatar}
-        />
+        {avatarUrl && displayName && (
+          <AvatarInputField
+            id="avatar"
+            name="avatar"
+            label={t("Avatar")}
+            avatarUrl={avatarUrl}
+            displayName={displayName}
+            onRemoveAvatar={onRemoveAvatar}
+          />
+        )}
       </FieldRow>
       <FieldRow>
         <InputField
diff --git a/src/settings/SettingsModal.tsx b/src/settings/SettingsModal.tsx
index bdb9fae6..19379cb4 100644
--- a/src/settings/SettingsModal.tsx
+++ b/src/settings/SettingsModal.tsx
@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { ChangeEvent, useCallback, useState } from "react";
+import { ChangeEvent, Key, useCallback, useState } from "react";
 import { Item } from "@react-stately/collections";
 import { Trans, useTranslation } from "react-i18next";
 import { MatrixClient } from "matrix-js-sdk";
@@ -99,8 +99,8 @@ export const SettingsModal = (props: Props) => {
   const [selectedTab, setSelectedTab] = useState<string | undefined>();
 
   const onSelectedTabChanged = useCallback(
-    (tab) => {
-      setSelectedTab(tab);
+    (tab: Key) => {
+      setSelectedTab(tab.toString());
     },
     [setSelectedTab]
   );
@@ -118,6 +118,144 @@ export const SettingsModal = (props: Props) => {
 
   const devices = props.mediaDevicesSwitcher;
 
+  const tabs = [
+    <TabItem
+      key="audio"
+      title={
+        <>
+          <AudioIcon width={16} height={16} />
+          <span className={styles.tabLabel}>{t("Audio")}</span>
+        </>
+      }
+    >
+      {devices && generateDeviceSelection(devices.audioIn, t("Microphone"))}
+      {devices && generateDeviceSelection(devices.audioOut, t("Speaker"))}
+    </TabItem>,
+    <TabItem
+      key="video"
+      title={
+        <>
+          <VideoIcon width={16} height={16} />
+          <span>{t("Video")}</span>
+        </>
+      }
+    >
+      {devices && generateDeviceSelection(devices.videoIn, t("Camera"))}
+    </TabItem>,
+    <TabItem
+      key="feedback"
+      title={
+        <>
+          <FeedbackIcon width={16} height={16} />
+          <span>{t("Feedback")}</span>
+        </>
+      }
+    >
+      <FeedbackSettingsTab roomId={props.roomId} />
+    </TabItem>,
+    <TabItem
+      key="more"
+      title={
+        <>
+          <OverflowIcon width={16} height={16} />
+          <span>{t("More")}</span>
+        </>
+      }
+    >
+      <h4>Developer</h4>
+      <p>Version: {(import.meta.env.VITE_APP_VERSION as string) || "dev"}</p>
+      <FieldRow>
+        <InputField
+          id="developerSettingsTab"
+          type="checkbox"
+          checked={developerSettingsTab}
+          label={t("Developer Settings")}
+          description={t("Expose developer settings in the settings window.")}
+          onChange={(event: ChangeEvent<HTMLInputElement>) =>
+            setDeveloperSettingsTab(event.target.checked)
+          }
+        />
+      </FieldRow>
+      <h4>Analytics</h4>
+      <FieldRow>
+        <InputField
+          id="optInAnalytics"
+          type="checkbox"
+          checked={optInAnalytics ?? undefined}
+          description={optInDescription}
+          onChange={(event: ChangeEvent<HTMLInputElement>) => {
+            setOptInAnalytics?.(event.target.checked);
+          }}
+        />
+      </FieldRow>
+    </TabItem>,
+  ];
+
+  if (!isEmbedded) {
+    tabs.push(
+      <TabItem
+        key="profile"
+        title={
+          <>
+            <UserIcon width={15} height={15} />
+            <span>{t("Profile")}</span>
+          </>
+        }
+      >
+        <ProfileSettingsTab client={props.client} />
+      </TabItem>
+    );
+  }
+
+  if (developerSettingsTab) {
+    tabs.push(
+      <TabItem
+        key="developer"
+        title={
+          <>
+            <DeveloperIcon width={16} height={16} />
+            <span>{t("Developer")}</span>
+          </>
+        }
+      >
+        <FieldRow>
+          <Body className={styles.fieldRowText}>
+            {t("Version: {{version}}", {
+              version: import.meta.env.VITE_APP_VERSION || "dev",
+            })}
+          </Body>
+        </FieldRow>
+        <FieldRow>
+          <InputField
+            id="showInspector"
+            name="inspector"
+            label={t("Show call inspector")}
+            type="checkbox"
+            checked={showInspector}
+            onChange={(e: ChangeEvent<HTMLInputElement>) =>
+              setShowInspector(e.target.checked)
+            }
+          />
+        </FieldRow>
+        <FieldRow>
+          <InputField
+            id="showConnectionStats"
+            name="connection-stats"
+            label={t("Show connection stats")}
+            type="checkbox"
+            checked={showConnectionStats}
+            onChange={(e: ChangeEvent<HTMLInputElement>) =>
+              setShowConnectionStats(e.target.checked)
+            }
+          />
+        </FieldRow>
+        <FieldRow>
+          <Button onPress={downloadDebugLog}>{t("Download debug logs")}</Button>
+        </FieldRow>
+      </TabItem>
+    );
+  }
+
   return (
     <Modal
       title={t("Settings")}
@@ -131,141 +269,7 @@ export const SettingsModal = (props: Props) => {
         selectedKey={selectedTab ?? props.defaultTab ?? "audio"}
         className={styles.tabContainer}
       >
-        <TabItem
-          key="audio"
-          title={
-            <>
-              <AudioIcon width={16} height={16} />
-              <span className={styles.tabLabel}>{t("Audio")}</span>
-            </>
-          }
-        >
-          {devices && generateDeviceSelection(devices.audioIn, t("Microphone"))}
-          {devices && generateDeviceSelection(devices.audioOut, t("Speaker"))}
-        </TabItem>
-        <TabItem
-          key="video"
-          title={
-            <>
-              <VideoIcon width={16} height={16} />
-              <span>{t("Video")}</span>
-            </>
-          }
-        >
-          {devices && generateDeviceSelection(devices.videoIn, t("Camera"))}
-        </TabItem>
-        {!isEmbedded && (
-          <TabItem
-            key="profile"
-            title={
-              <>
-                <UserIcon width={15} height={15} />
-                <span>{t("Profile")}</span>
-              </>
-            }
-          >
-            <ProfileSettingsTab client={props.client} />
-          </TabItem>
-        )}
-        <TabItem
-          key="feedback"
-          title={
-            <>
-              <FeedbackIcon width={16} height={16} />
-              <span>{t("Feedback")}</span>
-            </>
-          }
-        >
-          <FeedbackSettingsTab roomId={props.roomId} />
-        </TabItem>
-        <TabItem
-          key="more"
-          title={
-            <>
-              <OverflowIcon width={16} height={16} />
-              <span>{t("More")}</span>
-            </>
-          }
-        >
-          <h4>Developer</h4>
-          <p>
-            Version: {(import.meta.env.VITE_APP_VERSION as string) || "dev"}
-          </p>
-          <FieldRow>
-            <InputField
-              id="developerSettingsTab"
-              type="checkbox"
-              checked={developerSettingsTab}
-              label={t("Developer Settings")}
-              description={t(
-                "Expose developer settings in the settings window."
-              )}
-              onChange={(event: ChangeEvent<HTMLInputElement>) =>
-                setDeveloperSettingsTab(event.target.checked)
-              }
-            />
-          </FieldRow>
-          <h4>Analytics</h4>
-          <FieldRow>
-            <InputField
-              id="optInAnalytics"
-              type="checkbox"
-              checked={optInAnalytics}
-              description={optInDescription}
-              onChange={(event: ChangeEvent<HTMLInputElement>) =>
-                setOptInAnalytics(event.target.checked)
-              }
-            />
-          </FieldRow>
-        </TabItem>
-        {developerSettingsTab && (
-          <TabItem
-            key="developer"
-            title={
-              <>
-                <DeveloperIcon width={16} height={16} />
-                <span>{t("Developer")}</span>
-              </>
-            }
-          >
-            <FieldRow>
-              <Body className={styles.fieldRowText}>
-                {t("Version: {{version}}", {
-                  version: import.meta.env.VITE_APP_VERSION || "dev",
-                })}
-              </Body>
-            </FieldRow>
-            <FieldRow>
-              <InputField
-                id="showInspector"
-                name="inspector"
-                label={t("Show call inspector")}
-                type="checkbox"
-                checked={showInspector}
-                onChange={(e: ChangeEvent<HTMLInputElement>) =>
-                  setShowInspector(e.target.checked)
-                }
-              />
-            </FieldRow>
-            <FieldRow>
-              <InputField
-                id="showConnectionStats"
-                name="connection-stats"
-                label={t("Show connection stats")}
-                type="checkbox"
-                checked={showConnectionStats}
-                onChange={(e: ChangeEvent<HTMLInputElement>) =>
-                  setShowConnectionStats(e.target.checked)
-                }
-              />
-            </FieldRow>
-            <FieldRow>
-              <Button onPress={downloadDebugLog}>
-                {t("Download debug logs")}
-              </Button>
-            </FieldRow>
-          </TabItem>
-        )}
+        {tabs}
       </TabContainer>
     </Modal>
   );
diff --git a/src/settings/rageshake.ts b/src/settings/rageshake.ts
index 1f3f71c7..8fcc19da 100644
--- a/src/settings/rageshake.ts
+++ b/src/settings/rageshake.ts
@@ -79,11 +79,17 @@ class ConsoleLogger extends EventEmitter {
       warn: "W",
       error: "E",
     };
-    Object.keys(consoleFunctionsToLevels).forEach((fnName) => {
-      const level = consoleFunctionsToLevels[fnName];
-      const originalFn = consoleObj[fnName].bind(consoleObj);
-      this.originalFunctions[fnName] = originalFn;
-      consoleObj[fnName] = (...args) => {
+
+    Object.entries(consoleFunctionsToLevels).forEach(([name, level]) => {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
+      const originalFn = consoleObj[name].bind(consoleObj);
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
+      this.originalFunctions[name] = originalFn;
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
+      consoleObj[name] = (...args) => {
         this.log(level, ...args);
         originalFn(...args);
       };
@@ -147,9 +153,9 @@ class ConsoleLogger extends EventEmitter {
 // A class which stores log lines in an IndexedDB instance.
 class IndexedDBLogStore {
   private index = 0;
-  private db: IDBDatabase = null;
-  private flushPromise: Promise<void> = null;
-  private flushAgainPromise: Promise<void> = null;
+  private db?: IDBDatabase;
+  private flushPromise?: Promise<void>;
+  private flushAgainPromise?: Promise<void>;
   private id: string;
 
   constructor(
@@ -175,7 +181,7 @@ class IndexedDBLogStore {
       };
 
       req.onerror = () => {
-        const err = "Failed to open log database: " + req.error.name;
+        const err = "Failed to open log database: " + req?.error?.name;
         logger.error(err);
         reject(new Error(err));
       };
@@ -264,7 +270,7 @@ class IndexedDBLogStore {
           return this.flush();
         })
         .then(() => {
-          this.flushAgainPromise = null;
+          this.flushAgainPromise = undefined;
         });
       return this.flushAgainPromise;
     }
@@ -288,13 +294,13 @@ class IndexedDBLogStore {
       };
       txn.onerror = (event) => {
         logger.error("Failed to flush logs : ", event);
-        reject(new Error("Failed to write logs: " + txn.error.message));
+        reject(new Error("Failed to write logs: " + txn?.error?.message));
       };
       objStore.add(this.generateLogEntry(lines));
       const lastModStore = txn.objectStore("logslastmod");
       lastModStore.put(this.generateLastModifiedTime());
     }).then(() => {
-      this.flushPromise = null;
+      this.flushPromise = undefined;
     });
     return this.flushPromise;
   };
@@ -311,11 +317,14 @@ class IndexedDBLogStore {
    */
   public async consume(): Promise<LogEntry[]> {
     const db = this.db;
+    if (!db) {
+      return Promise.reject(new Error("No connected database"));
+    }
 
     // Returns: a string representing the concatenated logs for this ID.
     // Stops adding log fragments when the size exceeds maxSize
     function fetchLogs(id: string, maxSize: number): Promise<string> {
-      const objectStore = db
+      const objectStore = db!
         .transaction("logs", "readonly")
         .objectStore("logs");
 
@@ -325,7 +334,7 @@ class IndexedDBLogStore {
           .openCursor(IDBKeyRange.only(id), "prev");
         let lines = "";
         query.onerror = () => {
-          reject(new Error("Query failed: " + query.error.message));
+          reject(new Error("Query failed: " + query?.error?.message));
         };
         query.onsuccess = () => {
           const cursor = query.result;
@@ -346,7 +355,7 @@ class IndexedDBLogStore {
     // Returns: A sorted array of log IDs. (newest first)
     function fetchLogIds(): Promise<string[]> {
       // To gather all the log IDs, query for all records in logslastmod.
-      const o = db
+      const o = db!
         .transaction("logslastmod", "readonly")
         .objectStore("logslastmod");
       return selectQuery<{ ts: number; id: string }>(o, undefined, (cursor) => {
@@ -366,7 +375,7 @@ class IndexedDBLogStore {
 
     function deleteLogs(id: number): Promise<void> {
       return new Promise<void>((resolve, reject) => {
-        const txn = db.transaction(["logs", "logslastmod"], "readwrite");
+        const txn = db!.transaction(["logs", "logslastmod"], "readwrite");
         const o = txn.objectStore("logs");
         // only load the key path, not the data which may be huge
         const query = o.index("id").openKeyCursor(IDBKeyRange.only(id));
@@ -384,7 +393,7 @@ class IndexedDBLogStore {
         txn.onerror = () => {
           reject(
             new Error(
-              "Failed to delete logs for " + `'${id}' : ${txn.error.message}`
+              "Failed to delete logs for " + `'${id}' : ${txn?.error?.message}`
             )
           );
         };
@@ -395,7 +404,7 @@ class IndexedDBLogStore {
     }
 
     const allLogIds = await fetchLogIds();
-    let removeLogIds = [];
+    let removeLogIds: number[] = [];
     const logs: LogEntry[] = [];
     let size = 0;
     for (let i = 0; i < allLogIds.length; i++) {
@@ -414,7 +423,7 @@ class IndexedDBLogStore {
       if (size >= MAX_LOG_SIZE) {
         // the remaining log IDs should be removed. If we go out of
         // bounds this is just []
-        removeLogIds = allLogIds.slice(i + 1);
+        removeLogIds = allLogIds.slice(i + 1).map((id) => parseInt(id, 10));
         break;
       }
     }
@@ -462,14 +471,14 @@ class IndexedDBLogStore {
  */
 function selectQuery<T>(
   store: IDBObjectStore,
-  keyRange: IDBKeyRange,
+  keyRange: IDBKeyRange | undefined,
   resultMapper: (cursor: IDBCursorWithValue) => T
 ): Promise<T[]> {
   const query = store.openCursor(keyRange);
   return new Promise((resolve, reject) => {
-    const results = [];
+    const results: T[] = [];
     query.onerror = () => {
-      reject(new Error("Query failed: " + query.error.message));
+      reject(new Error("Query failed: " + query?.error?.message));
     };
     // collect results
     query.onsuccess = () => {
diff --git a/src/settings/submit-rageshake.ts b/src/settings/submit-rageshake.ts
index e5200c31..dcefb851 100644
--- a/src/settings/submit-rageshake.ts
+++ b/src/settings/submit-rageshake.ts
@@ -15,10 +15,12 @@ limitations under the License.
 */
 
 import { useCallback, useContext, useEffect, useState } from "react";
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore
 import pako from "pako";
 import { MatrixEvent } from "matrix-js-sdk/src/models/event";
 import { OverlayTriggerState } from "@react-stately/overlays";
-import { MatrixClient, ClientEvent } from "matrix-js-sdk/src/client";
+import { ClientEvent } from "matrix-js-sdk/src/client";
 
 import { getLogsForReport } from "./rageshake";
 import { useClient } from "../ClientContext";
@@ -46,20 +48,27 @@ export function useSubmitRageshake(): {
   submitRageshake: (opts: RageShakeSubmitOptions) => Promise<void>;
   sending: boolean;
   sent: boolean;
-  error: Error;
+  error?: Error;
 } {
-  const client: MatrixClient = useClient().client;
+  const { client } = useClient();
+
   // The value of the context is the whole tuple returned from setState,
   // so we just want the current state.
   const [inspectorState] = useContext(InspectorContext);
 
-  const [{ sending, sent, error }, setState] = useState({
+  const [{ sending, sent, error }, setState] = useState<{
+    sending: boolean;
+    sent: boolean;
+    error?: Error;
+  }>({
     sending: false,
     sent: false,
-    error: null,
+    error: undefined,
   });
 
   const submitRageshake = useCallback(
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     async (opts) => {
       if (!Config.get().rageshake?.submit_url) {
         throw new Error("No rageshake URL is configured");
@@ -70,7 +79,7 @@ export function useSubmitRageshake(): {
       }
 
       try {
-        setState({ sending: true, sent: false, error: null });
+        setState({ sending: true, sent: false, error: undefined });
 
         let userAgent = "UNKNOWN";
         if (window.navigator && window.navigator.userAgent) {
@@ -104,11 +113,11 @@ export function useSubmitRageshake(): {
         body.append("call_backend", "livekit");
 
         if (client) {
-          const userId = client.getUserId();
+          const userId = client.getUserId()!;
           const user = client.getUser(userId);
-          body.append("display_name", user?.displayName);
-          body.append("user_id", client.credentials.userId);
-          body.append("device_id", client.deviceId);
+          body.append("display_name", user?.displayName ?? "");
+          body.append("user_id", client.credentials.userId ?? "");
+          body.append("device_id", client.deviceId ?? "");
 
           if (opts.roomId) {
             body.append("room_id", opts.roomId);
@@ -120,11 +129,11 @@ export function useSubmitRageshake(): {
               keys.push(`curve25519:${client.getDeviceCurve25519Key()}`);
             }
             body.append("device_keys", keys.join(", "));
-            body.append("cross_signing_key", client.getCrossSigningId());
+            body.append("cross_signing_key", client.getCrossSigningId()!);
 
             // add cross-signing status information
-            const crossSigning = client.crypto.crossSigningInfo;
-            const secretStorage = client.crypto.secretStorage;
+            const crossSigning = client.crypto!.crossSigningInfo;
+            const secretStorage = client.crypto!.secretStorage;
 
             body.append(
               "cross_signing_ready",
@@ -138,7 +147,7 @@ export function useSubmitRageshake(): {
                 )
               )
             );
-            body.append("cross_signing_key", crossSigning.getId());
+            body.append("cross_signing_key", crossSigning.getId()!);
             body.append(
               "cross_signing_privkey_in_secret_storage",
               String(
@@ -150,14 +159,17 @@ export function useSubmitRageshake(): {
             body.append(
               "cross_signing_master_privkey_cached",
               String(
-                !!(pkCache && (await pkCache.getCrossSigningKeyCache("master")))
+                !!(
+                  pkCache?.getCrossSigningKeyCache &&
+                  (await pkCache.getCrossSigningKeyCache("master"))
+                )
               )
             );
             body.append(
               "cross_signing_self_signing_privkey_cached",
               String(
                 !!(
-                  pkCache &&
+                  pkCache?.getCrossSigningKeyCache &&
                   (await pkCache.getCrossSigningKeyCache("self_signing"))
                 )
               )
@@ -166,7 +178,7 @@ export function useSubmitRageshake(): {
               "cross_signing_user_signing_privkey_cached",
               String(
                 !!(
-                  pkCache &&
+                  pkCache?.getCrossSigningKeyCache &&
                   (await pkCache.getCrossSigningKeyCache("user_signing"))
                 )
               )
@@ -186,7 +198,7 @@ export function useSubmitRageshake(): {
               String(!!(await client.isKeyBackupKeyStored()))
             );
             const sessionBackupKeyFromCache =
-              await client.crypto.getSessionBackupPrivateKey();
+              await client.crypto!.getSessionBackupPrivateKey();
             body.append(
               "session_backup_key_cached",
               String(!!sessionBackupKeyFromCache)
@@ -233,7 +245,7 @@ export function useSubmitRageshake(): {
               Object.keys(estimate.usageDetails).forEach((k) => {
                 body.append(
                   `storageManager_usage_${k}`,
-                  String(estimate.usageDetails[k])
+                  String(estimate.usageDetails![k])
                 );
               });
             }
@@ -271,14 +283,14 @@ export function useSubmitRageshake(): {
           );
         }
 
-        await fetch(Config.get().rageshake?.submit_url, {
+        await fetch(Config.get().rageshake!.submit_url, {
           method: "POST",
           body,
         });
 
-        setState({ sending: false, sent: true, error: null });
+        setState({ sending: false, sent: true, error: undefined });
       } catch (error) {
-        setState({ sending: false, sent: false, error });
+        setState({ sending: false, sent: false, error: error as Error });
         console.error(error);
       }
     },
@@ -307,7 +319,7 @@ export function useDownloadDebugLog(): () => void {
     el.click();
     setTimeout(() => {
       URL.revokeObjectURL(url);
-      el.parentNode.removeChild(el);
+      el.parentNode!.removeChild(el);
     }, 0);
   }, [json]);
 
@@ -321,8 +333,8 @@ export function useRageshakeRequest(): (
   const { client } = useClient();
 
   const sendRageshakeRequest = useCallback(
-    (roomId, rageshakeRequestId) => {
-      client.sendEvent(roomId, "org.matrix.rageshake_request", {
+    (roomId: string, rageshakeRequestId: string) => {
+      client!.sendEvent(roomId, "org.matrix.rageshake_request", {
         request_id: rageshakeRequestId,
       });
     },
@@ -347,10 +359,12 @@ export function useRageshakeRequestModal(roomId: string): {
     modalState: OverlayTriggerState;
     modalProps: ModalProps;
   };
-  const client: MatrixClient = useClient().client;
+  const { client } = useClient();
   const [rageshakeRequestId, setRageshakeRequestId] = useState<string>();
 
   useEffect(() => {
+    if (!client) return;
+
     const onEvent = (event: MatrixEvent) => {
       const type = event.getType();
 
@@ -371,5 +385,8 @@ export function useRageshakeRequestModal(roomId: string): {
     };
   }, [modalState.open, roomId, client, modalState]);
 
-  return { modalState, modalProps: { ...modalProps, rageshakeRequestId } };
+  return {
+    modalState,
+    modalProps: { ...modalProps, rageshakeRequestId: rageshakeRequestId ?? "" },
+  };
 }
diff --git a/src/tabs/Tabs.tsx b/src/tabs/Tabs.tsx
index fec060ae..5ed75a05 100644
--- a/src/tabs/Tabs.tsx
+++ b/src/tabs/Tabs.tsx
@@ -32,7 +32,7 @@ export function TabContainer<T extends object>(
   props: TabContainerProps<T>
 ): JSX.Element {
   const state = useTabListState<T>(props);
-  const ref = useRef<HTMLUListElement>();
+  const ref = useRef<HTMLUListElement>(null);
   const { tabListProps } = useTabList(props, state, ref);
   return (
     <div className={classNames(styles.tabContainer, props.className)}>
@@ -53,7 +53,7 @@ interface TabProps<T> {
 
 function Tab<T>({ item, state }: TabProps<T>): JSX.Element {
   const { key, rendered } = item;
-  const ref = useRef<HTMLLIElement>();
+  const ref = useRef<HTMLLIElement>(null);
   const { tabProps } = useTab({ key }, state, ref);
 
   return (
@@ -75,7 +75,7 @@ interface TabPanelProps<T> extends AriaTabPanelProps {
 }
 
 function TabPanel<T>({ state, ...props }: TabPanelProps<T>): JSX.Element {
-  const ref = useRef<HTMLDivElement>();
+  const ref = useRef<HTMLDivElement>(null);
   const { tabPanelProps } = useTabPanel(props, state, ref);
   return (
     <div {...tabPanelProps} ref={ref} className={styles.tabPanel}>
diff --git a/src/typography/Typography.tsx b/src/typography/Typography.tsx
index bc67377c..2c3687ae 100644
--- a/src/typography/Typography.tsx
+++ b/src/typography/Typography.tsx
@@ -46,7 +46,7 @@ export const Headline = forwardRef<HTMLHeadingElement, TypographyProps>(
       {
         ...rest,
         className: classNames(
-          styles[fontWeight],
+          styles[fontWeight ?? ""],
           { [styles.overflowEllipsis]: overflowEllipsis },
           className
         ),
@@ -74,7 +74,7 @@ export const Title = forwardRef<HTMLHeadingElement, TypographyProps>(
       {
         ...rest,
         className: classNames(
-          styles[fontWeight],
+          styles[fontWeight ?? ""],
           { [styles.overflowEllipsis]: overflowEllipsis },
           className
         ),
@@ -102,7 +102,7 @@ export const Subtitle = forwardRef<HTMLParagraphElement, TypographyProps>(
       {
         ...rest,
         className: classNames(
-          styles[fontWeight],
+          styles[fontWeight ?? ""],
           { [styles.overflowEllipsis]: overflowEllipsis },
           className
         ),
@@ -130,7 +130,7 @@ export const Body = forwardRef<HTMLParagraphElement, TypographyProps>(
       {
         ...rest,
         className: classNames(
-          styles[fontWeight],
+          styles[fontWeight ?? ""],
           { [styles.overflowEllipsis]: overflowEllipsis },
           className
         ),
@@ -159,7 +159,7 @@ export const Caption = forwardRef<HTMLParagraphElement, TypographyProps>(
         ...rest,
         className: classNames(
           styles.caption,
-          styles[fontWeight],
+          styles[fontWeight ?? ""],
           { [styles.overflowEllipsis]: overflowEllipsis },
           className
         ),
@@ -188,7 +188,7 @@ export const Micro = forwardRef<HTMLParagraphElement, TypographyProps>(
         ...rest,
         className: classNames(
           styles.micro,
-          styles[fontWeight],
+          styles[fontWeight ?? ""],
           { [styles.overflowEllipsis]: overflowEllipsis },
           className
         ),
@@ -219,6 +219,8 @@ export const Link = forwardRef<HTMLAnchorElement, LinkProps>(
     },
     ref
   ) => {
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     const Component: string | RouterLink = as || (to ? RouterLink : "a");
     let externalLinkProps: { href: string; target: string; rel: string };
 
@@ -233,12 +235,16 @@ export const Link = forwardRef<HTMLAnchorElement, LinkProps>(
     return createElement(
       Component,
       {
+        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+        // @ts-ignore
         ...externalLinkProps,
         ...rest,
+        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+        // @ts-ignore
         to: to,
         className: classNames(
           styles[color],
-          styles[fontWeight],
+          styles[fontWeight ?? ""],
           { [styles.overflowEllipsis]: overflowEllipsis },
           className
         ),
diff --git a/src/useEvents.ts b/src/useEvents.ts
index 54f23693..91a03abd 100644
--- a/src/useEvents.ts
+++ b/src/useEvents.ts
@@ -31,8 +31,13 @@ export const useEventTarget = <T extends Event>(
 ) => {
   useEffect(() => {
     if (target) {
-      target.addEventListener(eventType, listener, options);
-      return () => target.removeEventListener(eventType, listener, options);
+      target.addEventListener(eventType, listener as EventListener, options);
+      return () =>
+        target.removeEventListener(
+          eventType,
+          listener as EventListener,
+          options
+        );
     }
   }, [target, eventType, listener, options]);
 };
diff --git a/src/useLocationNavigation.ts b/src/useLocationNavigation.ts
index 33115a3f..08f28fc9 100644
--- a/src/useLocationNavigation.ts
+++ b/src/useLocationNavigation.ts
@@ -21,7 +21,9 @@ export function useLocationNavigation(enabled = false): void {
   const history = useHistory();
 
   useEffect(() => {
-    let unblock;
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
+    let unblock = undefined;
 
     if (enabled) {
       unblock = history.block((tx) => {
@@ -33,6 +35,8 @@ export function useLocationNavigation(enabled = false): void {
     }
 
     return () => {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       if (unblock) {
         unblock();
       }
diff --git a/src/video-grid/BigGrid.tsx b/src/video-grid/BigGrid.tsx
index 7eaaed0b..d8f7a859 100644
--- a/src/video-grid/BigGrid.tsx
+++ b/src/video-grid/BigGrid.tsx
@@ -55,7 +55,7 @@ export interface Grid {
   cells: Cell[];
 }
 
-interface SparseGrid {
+export interface SparseGrid {
   columns: number;
   /**
    * The cells of the grid, in left-to-right top-to-bottom order.
@@ -803,7 +803,7 @@ export function setTileSize<G extends Grid | SparseGrid>(
 
     const result: SparseGrid = gridWithoutTile;
     placeTile(to, toEnd, result);
-    return fillGaps(result, true, (i) => inArea(i, to, toEnd, g)) as G;
+    return fillGaps(result, true, (i: number) => inArea(i, to, toEnd, g)) as G;
   } else if (toWidth >= fromWidth && toHeight >= fromHeight) {
     // The tile is growing, which might be able to happen in-place
     const to = findNearestCell(
@@ -1054,7 +1054,8 @@ export const BigGrid: Layout<Grid> = {
   emptyState: { columns: 4, cells: [] },
   updateTiles,
   updateBounds,
-  getTiles: <T,>(g) => g.cells.filter((c) => c.origin).map((c) => c!.item as T),
+  getTiles: <T,>(g: Grid) =>
+    g.cells.filter((c) => c.origin).map((c) => c!.item as T),
   canDragTile: () => true,
   dragTile,
   toggleFocus: cycleTileSize,
diff --git a/src/video-grid/NewVideoGrid.tsx b/src/video-grid/NewVideoGrid.tsx
index 57be72fa..3363c573 100644
--- a/src/video-grid/NewVideoGrid.tsx
+++ b/src/video-grid/NewVideoGrid.tsx
@@ -271,10 +271,19 @@ export function NewVideoGrid<T>({
   // gesture using the much more sensible ref-based method.
   const onTileDrag = (
     tileId: string,
+
     {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       tap,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       initial: [initialX, initialY],
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       delta: [dx, dy],
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       last,
     }: Parameters<Handler<"drag", EventTypes["drag"]>>[0]
   ) => {
@@ -325,6 +334,8 @@ export function NewVideoGrid<T>({
   const scrollOffset = useRef(0);
 
   useScroll(
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
     ({ xy: [, y], delta: [, dy] }) => {
       scrollOffset.current = y;
 
diff --git a/src/video-grid/VideoGrid.tsx b/src/video-grid/VideoGrid.tsx
index e6590931..77393b8b 100644
--- a/src/video-grid/VideoGrid.tsx
+++ b/src/video-grid/VideoGrid.tsx
@@ -695,7 +695,7 @@ function getSubGridPositions(
 // Calculates the number of possible tiles that can be displayed
 function displayedTileCount(
   layout: Layout,
-  tileCount,
+  tileCount: number,
   gridWidth: number,
   gridHeight: number
 ): number {
@@ -854,7 +854,7 @@ export function VideoGrid<T>({
     tilePositions: [],
   });
   const [scrollPosition, setScrollPosition] = useState<number>(0);
-  const draggingTileRef = useRef<DragTileData>(null);
+  const draggingTileRef = useRef<DragTileData | null>(null);
   const lastTappedRef = useRef<{ [index: Key]: number }>({});
   const lastLayoutRef = useRef<Layout>(layout);
   const isMounted = useIsMounted();
@@ -1189,11 +1189,23 @@ export function VideoGrid<T>({
   const onTileDrag = (
     tileId: string,
     {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       active,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       xy,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       movement,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       tap,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       last,
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       event,
     }: Parameters<Handler<"drag", EventTypes["drag"]>>[0]
   ) => {
@@ -1345,7 +1357,11 @@ export function VideoGrid<T>({
 
   const bindGrid = useGesture(
     {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       onWheel: (e) => onGridGesture(e, true),
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
       onDrag: (e) => onGridGesture(e, false),
     },
     {}
diff --git a/src/video-grid/VideoTile.tsx b/src/video-grid/VideoTile.tsx
index e736896e..63ceddf2 100644
--- a/src/video-grid/VideoTile.tsx
+++ b/src/video-grid/VideoTile.tsx
@@ -136,7 +136,7 @@ export const VideoTile = forwardRef<HTMLDivElement, Props>(
           <AudioButton
             key="localVolume"
             className={styles.button}
-            volume={(sfuParticipant as RemoteParticipant).getVolume()}
+            volume={(sfuParticipant as RemoteParticipant).getVolume() ?? 0}
             onPress={onOptionsPress}
           />
         );
diff --git a/src/video-grid/VideoTileSettingsModal.tsx b/src/video-grid/VideoTileSettingsModal.tsx
index eed2ccf4..00d41c50 100644
--- a/src/video-grid/VideoTileSettingsModal.tsx
+++ b/src/video-grid/VideoTileSettingsModal.tsx
@@ -32,7 +32,7 @@ const LocalVolume: React.FC<LocalVolumeProps> = ({
   participant,
 }: LocalVolumeProps) => {
   const [localVolume, setLocalVolume] = useState<number>(
-    participant.getVolume()
+    participant.getVolume() ?? 0
   );
 
   const onLocalVolumeChanged = (event: ChangeEvent<HTMLInputElement>) => {
diff --git a/test/otel/ObjectFlattener-test.ts b/test/otel/ObjectFlattener-test.ts
index b2fdce37..bbaf1146 100644
--- a/test/otel/ObjectFlattener-test.ts
+++ b/test/otel/ObjectFlattener-test.ts
@@ -102,7 +102,7 @@ describe("ObjectFlattener", () => {
           localCandidateType: "srfx",
           remoteCandidateType: "srfx",
           networkType: "ethernet",
-          rtt: null,
+          rtt: 0,
         },
       ],
       audioConcealment: new Map([
@@ -167,7 +167,7 @@ describe("ObjectFlattener", () => {
         "matrix.call.stats.connection.transport.1.localCandidateType": "srfx",
         "matrix.call.stats.connection.transport.1.remoteCandidateType": "srfx",
         "matrix.call.stats.connection.transport.1.networkType": "ethernet",
-        "matrix.call.stats.connection.transport.1.rtt": "null",
+        "matrix.call.stats.connection.transport.1.rtt": 0,
       });
     });
   });
@@ -234,7 +234,7 @@ describe("ObjectFlattener", () => {
         "matrix.call.stats.connection.transport.1.localCandidateType": "srfx",
         "matrix.call.stats.connection.transport.1.remoteCandidateType": "srfx",
         "matrix.call.stats.connection.transport.1.networkType": "ethernet",
-        "matrix.call.stats.connection.transport.1.rtt": "null",
+        "matrix.call.stats.connection.transport.1.rtt": 0,
         "matrix.call.stats.connection.audioConcealment.REMOTE_AUDIO_TRACK_ID.concealedAudio": 0,
         "matrix.call.stats.connection.audioConcealment.REMOTE_AUDIO_TRACK_ID.totalAudioDuration": 0,
         "matrix.call.stats.connection.audioConcealment.REMOTE_VIDEO_TRACK_ID.concealedAudio": 0,
diff --git a/test/video-grid/BigGrid-test.ts b/test/video-grid/BigGrid-test.ts
index 0c74b612..7bc20a95 100644
--- a/test/video-grid/BigGrid-test.ts
+++ b/test/video-grid/BigGrid-test.ts
@@ -21,6 +21,7 @@ import {
   fillGaps,
   forEachCellInArea,
   Grid,
+  SparseGrid,
   resize,
   row,
   moveTile,
@@ -339,7 +340,9 @@ function testAddItems(
   output: string
 ): void {
   test(`addItems ${title}`, () => {
-    expect(showGrid(addItems(items, mkGrid(input)))).toBe(output);
+    expect(showGrid(addItems(items, mkGrid(input) as SparseGrid) as Grid)).toBe(
+      output
+    );
   });
 }
 
diff --git a/tsconfig.json b/tsconfig.json
index c588d0e2..d81219c9 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,23 +1,31 @@
 {
   "compilerOptions": {
     "target": "es2016",
-    "esModuleInterop": true,
     "module": "es2020",
-    "moduleResolution": "node",
-    "noEmit": true,
-    "noImplicitAny": false,
-    "noUnusedLocals": true,
     "jsx": "react-jsx",
     "lib": ["es2020", "dom", "dom.iterable"],
-    "strict": false,
-    "plugins": [
-      {
-        "name": "typescript-strict-plugin",
-        "paths": ["src"]
-      }
-    ]
+
+    // From Matrix-JS-SDK
+    "strict": true,
+    "noEmit": true,
+    "noEmitOnError": true,
+    "experimentalDecorators": true,
+    "esModuleInterop": true,
+    "noUnusedLocals": true,
+    "moduleResolution": "node",
+    "declaration": true
+
+    // TODO: Enable the following options later.
+    // "forceConsistentCasingInFileNames": true,
+    // "noFallthroughCasesInSwitch": true,
+    // "noImplicitOverride": true,
+    // "noImplicitReturns": true,
+    // "noPropertyAccessFromIndexSignature": true,
+    // "noUncheckedIndexedAccess": true,
+    // "noUnusedParameters": true,
   },
   "include": [
+    "./node_modules/matrix-js-sdk/src/@types/*.d.ts",
     "./src/**/*.ts",
     "./src/**/*.tsx",
     "./test/**/*.ts",
diff --git a/yarn.lock b/yarn.lock
index 1b0ad142..7073bdf9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2186,10 +2186,10 @@
     "@react-hook/latest" "^1.0.3"
     clsx "^1.2.1"
 
-"@matrix-org/matrix-sdk-crypto-js@^0.1.0-alpha.10":
-  version "0.1.0-alpha.10"
-  resolved "https://registry.yarnpkg.com/@matrix-org/matrix-sdk-crypto-js/-/matrix-sdk-crypto-js-0.1.0-alpha.10.tgz#b6a6395cffd3197ae2e0a88f4eeae8b315571fd2"
-  integrity sha512-8V2NKuzGOFzEZeZVgF2is7gmuopdRbMZ064tzPDE0vN34iX6s3O8A4oxIT7SA3qtymwm3t1yEvTnT+0gfbmh4g==
+"@matrix-org/matrix-sdk-crypto-js@^0.1.1":
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/@matrix-org/matrix-sdk-crypto-js/-/matrix-sdk-crypto-js-0.1.2.tgz#b58679e161f3d734359a8665922956309b1a4417"
+  integrity sha512-bbal0RcWwerS/DgqhOgM7wkXJ2YSv9fySK/qgLlrAsdYLpMSTqG8wDQ89/v+RYo9WmA5hwUN/wXcCDdFaFEXQQ==
 
 "@matrix-org/olm@https://gitlab.matrix.org/api/v4/projects/27/packages/npm/@matrix-org/olm/-/@matrix-org/olm-3.2.14.tgz":
   version "3.2.14"
@@ -3893,6 +3893,11 @@
   resolved "https://registry.yarnpkg.com/@types/caseless/-/caseless-0.12.2.tgz#f65d3d6389e01eeb458bd54dc8f52b95a9463bc8"
   integrity sha512-6ckxMjBBD8URvjB6J3NcnuAn5Pkl7t3TizAg+xdlzzQGSPSmBcXf8KoIH0ua/i+tio+ZRUHEXp0HEmvaR4kt0w==
 
+"@types/content-type@^1.1.5":
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/@types/content-type/-/content-type-1.1.5.tgz#aa02dca40864749a9e2bf0161a6216da57e3ede5"
+  integrity sha512-dgMN+syt1xb7Hk8LU6AODOfPlvz5z1CbXpPuJE5ZrX9STfBOIXF09pEB8N7a97WT9dbngt3ksDCm6GW6yMrxfQ==
+
 "@types/eslint-scope@^3.7.3":
   version "3.7.4"
   resolved "https://registry.yarnpkg.com/@types/eslint-scope/-/eslint-scope-3.7.4.tgz#37fc1223f0786c39627068a12e94d6e6fc61de16"
@@ -3956,6 +3961,11 @@
   dependencies:
     "@types/unist" "*"
 
+"@types/history@^4.7.11":
+  version "4.7.11"
+  resolved "https://registry.yarnpkg.com/@types/history/-/history-4.7.11.tgz#56588b17ae8f50c53983a524fc3cc47437969d64"
+  integrity sha512-qjDJRrmvBMiTx+jyLxvLfJU7UznFuokDv4f3WRuriHKERccVpFU+8XMQUAbDzoiJCsmexxRExQeMwwCdamSKDA==
+
 "@types/html-minifier-terser@^5.0.0":
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/@types/html-minifier-terser/-/html-minifier-terser-5.1.2.tgz#693b316ad323ea97eed6b38ed1a3cc02b1672b57"
@@ -4104,6 +4114,23 @@
   dependencies:
     "@types/react" "*"
 
+"@types/react-router-dom@^5.3.3":
+  version "5.3.3"
+  resolved "https://registry.yarnpkg.com/@types/react-router-dom/-/react-router-dom-5.3.3.tgz#e9d6b4a66fcdbd651a5f106c2656a30088cc1e83"
+  integrity sha512-kpqnYK4wcdm5UaWI3fLcELopqLrHgLqNsdpHauzlQktfkHL3npOSwtj1Uz9oKBAzs7lFtVkV8j83voAz2D8fhw==
+  dependencies:
+    "@types/history" "^4.7.11"
+    "@types/react" "*"
+    "@types/react-router" "*"
+
+"@types/react-router@*":
+  version "5.1.20"
+  resolved "https://registry.yarnpkg.com/@types/react-router/-/react-router-5.1.20.tgz#88eccaa122a82405ef3efbcaaa5dcdd9f021387c"
+  integrity sha512-jGjmu/ZqS7FjSH6owMcD5qpq19+1RS9DeVRqfl1FeBMxTDQAGwlMWOcs52NDoXaNKyG3d1cYQFMs9rCrb88o9Q==
+  dependencies:
+    "@types/history" "^4.7.11"
+    "@types/react" "*"
+
 "@types/react-syntax-highlighter@11.0.5":
   version "11.0.5"
   resolved "https://registry.yarnpkg.com/@types/react-syntax-highlighter/-/react-syntax-highlighter-11.0.5.tgz#0d546261b4021e1f9d85b50401c0a42acb106087"
@@ -4194,6 +4221,11 @@
   resolved "https://registry.yarnpkg.com/@types/unist/-/unist-2.0.6.tgz#250a7b16c3b91f672a24552ec64678eeb1d3a08d"
   integrity sha512-PBjIUxZHOuj0R15/xuwJYjFi+KZdNFrehocChv4g5hu6aFroHue8m0lBP0POdK2nKzbw0cgV1mws8+V/JAcEkQ==
 
+"@types/uuid@9":
+  version "9.0.2"
+  resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-9.0.2.tgz#ede1d1b1e451548d44919dc226253e32a6952c4b"
+  integrity sha512-kNnC1GFBLuhImSnV7w4njQkUiJi0ZXUycu1rUaouPqiKlXkh77JKgdRnTAp1x5eBwcIwbtI+3otwzuIDEuDoxQ==
+
 "@types/webpack-env@^1.16.0":
   version "1.17.0"
   resolved "https://registry.yarnpkg.com/@types/webpack-env/-/webpack-env-1.17.0.tgz#f99ce359f1bfd87da90cc4a57cab0a18f34a48d0"
@@ -6404,6 +6436,11 @@ crypto-browserify@^3.11.0:
     randombytes "^2.0.0"
     randomfill "^1.0.3"
 
+crypto-js@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/crypto-js/-/crypto-js-4.1.1.tgz#9e485bcf03521041bd85844786b83fb7619736cf"
+  integrity sha512-o2JlM7ydqd3Qk9CA0L4NL6mTzU2sdx96a+oOfPu8Mkl/PK51vSyoi8/rQ8NknZtk44vq15lmhAj9CIAGwgeWKw==
+
 css-blank-pseudo@^3.0.3:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/css-blank-pseudo/-/css-blank-pseudo-3.0.3.tgz#36523b01c12a25d812df343a32c322d2a2324561"
@@ -9175,13 +9212,6 @@ history@^4.9.0:
     tiny-warning "^1.0.0"
     value-equal "^1.0.1"
 
-history@^5.2.0:
-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/history/-/history-5.3.0.tgz#1548abaa245ba47992f063a0783db91ef201c73b"
-  integrity sha512-ZqaKwjjrAYUYfLG+htGaIIZ4nioX2L70ZUMIFysS3xvBsSG4x/n1V6TXV3N8ZYNuFGlDirFg32T7B6WOUPDYcQ==
-  dependencies:
-    "@babel/runtime" "^7.7.6"
-
 hmac-drbg@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
@@ -10618,6 +10648,11 @@ junk@^3.1.0:
   resolved "https://registry.yarnpkg.com/junk/-/junk-3.1.0.tgz#31499098d902b7e98c5d9b9c80f43457a88abfa1"
   integrity sha512-pBxcB3LFc8QVgdggvZWyeys+hnrNWg4OcZIU/1X59k5jQdLBlCsYGRQaz234SqoRLTCgMH00fY0xRJH+F9METQ==
 
+jwt-decode@^3.1.2:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/jwt-decode/-/jwt-decode-3.1.2.tgz#3fb319f3675a2df0c2895c8f5e9fa4b67b04ed59"
+  integrity sha512-UfpWE/VZn0iP50d8cz9NrZLM9lSWhcJ+0Gt/nm4by88UL+J1SiKN8/5dkjMmbEzwL2CAe+67GsegCbIKtbp75A==
+
 khroma@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/khroma/-/khroma-1.4.1.tgz#ad6a5b6a972befc5112ce5129887a1a83af2c003"
@@ -10977,18 +11012,20 @@ matrix-events-sdk@0.0.1:
   resolved "https://registry.yarnpkg.com/matrix-events-sdk/-/matrix-events-sdk-0.0.1.tgz#c8c38911e2cb29023b0bbac8d6f32e0de2c957dd"
   integrity sha512-1QEOsXO+bhyCroIe2/A5OwaxHvBm7EsSQ46DEDn8RBIfQwN5HWBpFvyWWR4QY0KHPPnnJdI99wgRiAl7Ad5qaA==
 
-"matrix-js-sdk@github:matrix-org/matrix-js-sdk#9ba44b96202e36d8bd6fbcff3222b7c70fc371d7":
-  version "26.0.1"
-  resolved "https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/9ba44b96202e36d8bd6fbcff3222b7c70fc371d7"
+"matrix-js-sdk@github:matrix-org/matrix-js-sdk#d79d9ae69c3220c02406706d4a1ec52c22c44fbd":
+  version "26.2.0"
+  resolved "https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/d79d9ae69c3220c02406706d4a1ec52c22c44fbd"
   dependencies:
     "@babel/runtime" "^7.12.5"
-    "@matrix-org/matrix-sdk-crypto-js" "^0.1.0-alpha.10"
+    "@matrix-org/matrix-sdk-crypto-js" "^0.1.1"
     another-json "^0.2.0"
     bs58 "^5.0.0"
     content-type "^1.0.4"
+    jwt-decode "^3.1.2"
     loglevel "^1.7.1"
     matrix-events-sdk "0.0.1"
     matrix-widget-api "^1.3.1"
+    oidc-client-ts "^2.2.4"
     p-retry "4"
     sdp-transform "^2.14.1"
     unhomoglyph "^1.0.6"
@@ -11675,6 +11712,14 @@ objectorarray@^1.0.5:
   resolved "https://registry.yarnpkg.com/objectorarray/-/objectorarray-1.0.5.tgz#2c05248bbefabd8f43ad13b41085951aac5e68a5"
   integrity sha512-eJJDYkhJFFbBBAxeh8xW+weHlkI28n2ZdQV/J/DNfWfSKlGEf2xcfAbZTv3riEXHAhL9SVOTs2pRmXiSTf78xg==
 
+oidc-client-ts@^2.2.4:
+  version "2.2.4"
+  resolved "https://registry.yarnpkg.com/oidc-client-ts/-/oidc-client-ts-2.2.4.tgz#7d86b5efe2248f3637a6f3a0ee1af86764aea125"
+  integrity sha512-nOZwIomju+AmXObl5Oq5PjrES/qTt8bLsENJCIydVgi9TEWk7SCkOU6X3RNkY7yfySRM1OJJvDKdREZdmnDT2g==
+  dependencies:
+    crypto-js "^4.1.1"
+    jwt-decode "^3.1.2"
+
 on-finished@2.4.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/on-finished/-/on-finished-2.4.1.tgz#58c8c44116e54845ad57f14ab10b03533184ac3f"
@@ -12986,13 +13031,6 @@ react-router@5.3.3:
     tiny-invariant "^1.0.2"
     tiny-warning "^1.0.0"
 
-react-router@6:
-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/react-router/-/react-router-6.3.0.tgz#3970cc64b4cb4eae0c1ea5203a80334fdd175557"
-  integrity sha512-7Wh1DzVQ+tlFjkeo+ujvjSqSJmkt1+8JO+T5xklPlgrh70y7ogx75ODRW0ThWhY7S+6yEDks8TYrtQe/aoboBQ==
-  dependencies:
-    history "^5.2.0"
-
 react-syntax-highlighter@^15.4.5:
   version "15.5.0"
   resolved "https://registry.yarnpkg.com/react-syntax-highlighter/-/react-syntax-highlighter-15.5.0.tgz#4b3eccc2325fa2ec8eff1e2d6c18fa4a9e07ab20"