diff --git a/src/autocomplete/Autocompleter.ts b/src/autocomplete/Autocompleter.ts
index 5409825f45..ea8eddbb8d 100644
--- a/src/autocomplete/Autocompleter.ts
+++ b/src/autocomplete/Autocompleter.ts
@@ -15,8 +15,9 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {ReactElement} from 'react';
-import Room from 'matrix-js-sdk/src/models/room';
+import { ReactElement } from 'react';
+import { Room } from 'matrix-js-sdk/src/models/room';
+
 import CommandProvider from './CommandProvider';
 import CommunityProvider from './CommunityProvider';
 import DuckDuckGoProvider from './DuckDuckGoProvider';
@@ -24,7 +25,7 @@ import RoomProvider from './RoomProvider';
 import UserProvider from './UserProvider';
 import EmojiProvider from './EmojiProvider';
 import NotifProvider from './NotifProvider';
-import {timeout} from "../utils/promise";
+import { timeout } from "../utils/promise";
 import AutocompleteProvider, {ICommand} from "./AutocompleteProvider";
 import SettingsStore from "../settings/SettingsStore";
 import SpaceProvider from "./SpaceProvider";
diff --git a/src/autocomplete/NotifProvider.tsx b/src/autocomplete/NotifProvider.tsx
index 0bc7ead097..827f4aa885 100644
--- a/src/autocomplete/NotifProvider.tsx
+++ b/src/autocomplete/NotifProvider.tsx
@@ -15,7 +15,8 @@ limitations under the License.
 */
 
 import React from 'react';
-import Room from "matrix-js-sdk/src/models/room";
+import { Room } from "matrix-js-sdk/src/models/room";
+
 import AutocompleteProvider from './AutocompleteProvider';
 import { _t } from '../languageHandler';
 import {MatrixClientPeg} from '../MatrixClientPeg';
diff --git a/src/autocomplete/RoomProvider.tsx b/src/autocomplete/RoomProvider.tsx
index ad55b19101..a82a757a78 100644
--- a/src/autocomplete/RoomProvider.tsx
+++ b/src/autocomplete/RoomProvider.tsx
@@ -17,16 +17,16 @@ limitations under the License.
 */
 
 import React from "react";
-import {uniqBy, sortBy} from "lodash";
-import Room from "matrix-js-sdk/src/models/room";
+import { uniqBy, sortBy } from "lodash";
+import { Room } from "matrix-js-sdk/src/models/room";
 
 import { _t } from '../languageHandler';
 import AutocompleteProvider from './AutocompleteProvider';
-import {MatrixClientPeg} from '../MatrixClientPeg';
+import { MatrixClientPeg } from '../MatrixClientPeg';
 import QueryMatcher from './QueryMatcher';
-import {PillCompletion} from './Components';
-import {makeRoomPermalink} from "../utils/permalinks/Permalinks";
-import {ICompletion, ISelectionRange} from "./Autocompleter";
+import { PillCompletion } from './Components';
+import { makeRoomPermalink } from "../utils/permalinks/Permalinks";
+import { ICompletion, ISelectionRange } from "./Autocompleter";
 import RoomAvatar from '../components/views/avatars/RoomAvatar';
 import SettingsStore from "../settings/SettingsStore";
 
diff --git a/src/components/views/avatars/BaseAvatar.tsx b/src/components/views/avatars/BaseAvatar.tsx
index 6949c14636..f98f8c88a1 100644
--- a/src/components/views/avatars/BaseAvatar.tsx
+++ b/src/components/views/avatars/BaseAvatar.tsx
@@ -17,16 +17,17 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React, {useCallback, useContext, useEffect, useState} from 'react';
+import React, { useCallback, useContext, useEffect, useState } from 'react';
 import classNames from 'classnames';
+import { ResizeMethod } from 'matrix-js-sdk/src/@types/partials';
+
 import * as AvatarLogic from '../../../Avatar';
 import SettingsStore from "../../../settings/SettingsStore";
 import AccessibleButton from '../elements/AccessibleButton';
 import RoomContext from "../../../contexts/RoomContext";
 import MatrixClientContext from "../../../contexts/MatrixClientContext";
-import {useEventEmitter} from "../../../hooks/useEventEmitter";
-import {toPx} from "../../../utils/units";
-import {ResizeMethod} from "../../../Avatar";
+import { useEventEmitter } from "../../../hooks/useEventEmitter";
+import { toPx } from "../../../utils/units";
 import { _t } from '../../../languageHandler';
 
 interface IProps {
diff --git a/src/components/views/avatars/GroupAvatar.tsx b/src/components/views/avatars/GroupAvatar.tsx
index 3734ba9504..13dbbfec09 100644
--- a/src/components/views/avatars/GroupAvatar.tsx
+++ b/src/components/views/avatars/GroupAvatar.tsx
@@ -15,10 +15,11 @@ limitations under the License.
 */
 
 import React from 'react';
+import { ResizeMethod } from 'matrix-js-sdk/src/@types/partials';
+
 import BaseAvatar from './BaseAvatar';
-import {replaceableComponent} from "../../../utils/replaceableComponent";
-import {mediaFromMxc} from "../../../customisations/Media";
-import {ResizeMethod} from "../../../Avatar";
+import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { mediaFromMxc } from "../../../customisations/Media";
 
 export interface IProps {
         groupId?: string;
diff --git a/src/components/views/avatars/MemberAvatar.tsx b/src/components/views/avatars/MemberAvatar.tsx
index 3205ca372c..862563a8b4 100644
--- a/src/components/views/avatars/MemberAvatar.tsx
+++ b/src/components/views/avatars/MemberAvatar.tsx
@@ -16,14 +16,14 @@ limitations under the License.
 */
 
 import React from 'react';
-import {RoomMember} from "matrix-js-sdk/src/models/room-member";
+import { RoomMember } from "matrix-js-sdk/src/models/room-member";
+import { ResizeMethod } from 'matrix-js-sdk/src/@types/partials';
 
 import dis from "../../../dispatcher/dispatcher";
-import {Action} from "../../../dispatcher/actions";
+import { Action } from "../../../dispatcher/actions";
 import BaseAvatar from "./BaseAvatar";
-import {replaceableComponent} from "../../../utils/replaceableComponent";
-import {mediaFromMxc} from "../../../customisations/Media";
-import {ResizeMethod} from "../../../Avatar";
+import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { mediaFromMxc } from "../../../customisations/Media";
 
 interface IProps extends Omit<React.ComponentProps<typeof BaseAvatar>, "name" | "idName" | "url"> {
     member: RoomMember;
diff --git a/src/components/views/avatars/RoomAvatar.tsx b/src/components/views/avatars/RoomAvatar.tsx
index 4693d907ba..bd820509c5 100644
--- a/src/components/views/avatars/RoomAvatar.tsx
+++ b/src/components/views/avatars/RoomAvatar.tsx
@@ -13,17 +13,17 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-import React, {ComponentProps} from 'react';
-import Room from 'matrix-js-sdk/src/models/room';
+import React, { ComponentProps } from 'react';
+import { Room } from 'matrix-js-sdk/src/models/room';
+import { ResizeMethod } from 'matrix-js-sdk/src/@types/partials';
 
 import BaseAvatar from './BaseAvatar';
 import ImageView from '../elements/ImageView';
-import {MatrixClientPeg} from '../../../MatrixClientPeg';
+import { MatrixClientPeg } from '../../../MatrixClientPeg';
 import Modal from '../../../Modal';
 import * as Avatar from '../../../Avatar';
-import {ResizeMethod} from "../../../Avatar";
-import {replaceableComponent} from "../../../utils/replaceableComponent";
-import {mediaFromMxc} from "../../../customisations/Media";
+import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { mediaFromMxc } from "../../../customisations/Media";
 
 interface IProps extends Omit<ComponentProps<typeof BaseAvatar>, "name" | "idName" | "url" | "onClick"> {
     // Room may be left unset here, but if it is,
diff --git a/src/components/views/elements/RoomName.tsx b/src/components/views/elements/RoomName.tsx
index 9178155d19..cdd83aedc2 100644
--- a/src/components/views/elements/RoomName.tsx
+++ b/src/components/views/elements/RoomName.tsx
@@ -14,10 +14,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {useEffect, useState} from "react";
-import {Room} from "matrix-js-sdk/src/models/room";
+import React, { useEffect, useState } from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
 
-import {useEventEmitter} from "../../../hooks/useEventEmitter";
+import { useEventEmitter } from "../../../hooks/useEventEmitter";
 
 interface IProps {
     room: Room;
@@ -34,7 +34,7 @@ const RoomName = ({ room, children }: IProps): JSX.Element => {
     }, [room]);
 
     if (children) return children(name);
-    return name || "";
+    return <>{ name || "" }</>;
 };
 
 export default RoomName;
diff --git a/src/components/views/rooms/WhoIsTypingTile.tsx b/src/components/views/rooms/WhoIsTypingTile.tsx
index 3a1d2051b4..93078ff645 100644
--- a/src/components/views/rooms/WhoIsTypingTile.tsx
+++ b/src/components/views/rooms/WhoIsTypingTile.tsx
@@ -16,7 +16,7 @@ limitations under the License.
 */
 
 import React from 'react';
-import Room from "matrix-js-sdk/src/models/room";
+import { Room } from "matrix-js-sdk/src/models/room";
 import { RoomMember } from "matrix-js-sdk/src/models/room-member";
 import { MatrixEvent } from "matrix-js-sdk/src/models/event";
 
diff --git a/src/customisations/Media.ts b/src/customisations/Media.ts
index f9d957b60c..37e91fc54b 100644
--- a/src/customisations/Media.ts
+++ b/src/customisations/Media.ts
@@ -14,10 +14,11 @@
  * limitations under the License.
  */
 
-import {MatrixClientPeg} from "../MatrixClientPeg";
-import {IMediaEventContent, IPreparedMedia, prepEventContentAsMedia} from "./models/IMediaEventContent";
-import {ResizeMethod} from "../Avatar";
-import {MatrixClient} from "matrix-js-sdk/src/client";
+import { MatrixClient } from "matrix-js-sdk/src/client";
+import { ResizeMethod } from "matrix-js-sdk/src/@types/partials";
+
+import { MatrixClientPeg } from "../MatrixClientPeg";
+import { IMediaEventContent, IPreparedMedia, prepEventContentAsMedia } from "./models/IMediaEventContent";
 
 // Populate this class with the details of your customisations when copying it.
 
diff --git a/src/utils/ShieldUtils.ts b/src/utils/ShieldUtils.ts
index 5fe653fed0..c855b81bf8 100644
--- a/src/utils/ShieldUtils.ts
+++ b/src/utils/ShieldUtils.ts
@@ -1,30 +1,31 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { MatrixClient } from "matrix-js-sdk/src/client";
+import { Room } from "matrix-js-sdk/src/models/room";
+
 import DMRoomMap from './DMRoomMap';
 
-/* For now, a cut-down type spec for the client */
-interface Client {
-    getUserId: () => string;
-    checkUserTrust: (userId: string) => {
-        isCrossSigningVerified: () => boolean
-        wasCrossSigningVerified: () => boolean
-    };
-    getStoredDevicesForUser: (userId: string) => [{ deviceId: string }];
-    checkDeviceTrust: (userId: string, deviceId: string) => {
-        isVerified: () => boolean
-    };
-}
-
-interface Room {
-    getEncryptionTargetMembers: () => Promise<[{userId: string}]>;
-    roomId: string;
-}
-
 export enum E2EStatus {
     Warning = "warning",
     Verified = "verified",
     Normal = "normal"
 }
 
-export async function shieldStatusForRoom(client: Client, room: Room): Promise<E2EStatus> {
+export async function shieldStatusForRoom(client: MatrixClient, room: Room): Promise<E2EStatus> {
     const members = (await room.getEncryptionTargetMembers()).map(({userId}) => userId);
     const inDMMap = !!DMRoomMap.shared().getUserIdForRoomId(room.roomId);