From 88cadd52a8d178ead74abd1ec9f8b6af6f4377a8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 19:54:43 +0200
Subject: [PATCH 01/20] Convert VerificationQRCode to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 ...ificationQRCode.js => VerificationQRCode.tsx} | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)
 rename src/components/views/elements/crypto/{VerificationQRCode.js => VerificationQRCode.tsx} (79%)

diff --git a/src/components/views/elements/crypto/VerificationQRCode.js b/src/components/views/elements/crypto/VerificationQRCode.tsx
similarity index 79%
rename from src/components/views/elements/crypto/VerificationQRCode.js
rename to src/components/views/elements/crypto/VerificationQRCode.tsx
index 76cfb82d353..be9ede59b1d 100644
--- a/src/components/views/elements/crypto/VerificationQRCode.js
+++ b/src/components/views/elements/crypto/VerificationQRCode.tsx
@@ -15,20 +15,20 @@ limitations under the License.
 */
 
 import React from "react";
-import PropTypes from "prop-types";
 import { replaceableComponent } from "../../../../utils/replaceableComponent";
 import QRCode from "../QRCode";
+import { QRCodeData } from "matrix-js-sdk/src/crypto/verification/QRCode";
 
-@replaceableComponent("views.elements.crypto.VerificationQRCode")
-export default class VerificationQRCode extends React.PureComponent {
-    static propTypes = {
-        qrCodeData: PropTypes.object.isRequired,
-    };
+interface IProps {
+    qrCodeData: QRCodeData;
+}
 
-    render() {
+@replaceableComponent("views.elements.crypto.VerificationQRCode")
+export default class VerificationQRCode extends React.PureComponent<IProps> {
+    public render(): JSX.Element {
         return (
             <QRCode
-                data={[{ data: this.props.qrCodeData.buffer, mode: 'byte' }]}
+                data={[{ data: this.props.qrCodeData.getBuffer(), mode: 'byte' }]}
                 className="mx_VerificationQRCode"
                 width={196} />
         );

From 971d375a5c9fb664159870ef1907a2206acf94bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 19:57:22 +0200
Subject: [PATCH 02/20] Convert AppWarning to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../elements/{AppWarning.js => AppWarning.tsx} | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)
 rename src/components/views/elements/{AppWarning.js => AppWarning.tsx} (60%)

diff --git a/src/components/views/elements/AppWarning.js b/src/components/views/elements/AppWarning.tsx
similarity index 60%
rename from src/components/views/elements/AppWarning.js
rename to src/components/views/elements/AppWarning.tsx
index 517242dab5a..bac486d4b80 100644
--- a/src/components/views/elements/AppWarning.js
+++ b/src/components/views/elements/AppWarning.tsx
@@ -1,24 +1,20 @@
-import React from 'react'; // eslint-disable-line no-unused-vars
-import PropTypes from 'prop-types';
+import React from 'react';
 
-const AppWarning = (props) => {
+interface IProps {
+    errorMsg?: string;
+}
+
+const AppWarning: React.FC<IProps> = (props) => {
     return (
         <div className='mx_AppPermissionWarning'>
             <div className='mx_AppPermissionWarningImage'>
                 <img src={require("../../../../res/img/warning.svg")} alt='' />
             </div>
             <div className='mx_AppPermissionWarningText'>
-                <span className='mx_AppPermissionWarningTextLabel'>{ props.errorMsg }</span>
+                <span className='mx_AppPermissionWarningTextLabel'>{ props.errorMsg || "Error" }</span>
             </div>
         </div>
     );
 };
 
-AppWarning.propTypes = {
-    errorMsg: PropTypes.string,
-};
-AppWarning.defaultProps = {
-    errorMsg: 'Error',
-};
-
 export default AppWarning;

From ea623e79bb79e61ca2305e198299cbb3cdba9f49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 20:11:58 +0200
Subject: [PATCH 03/20] Convert DirectorySearchBox to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 ...orySearchBox.js => DirectorySearchBox.tsx} | 81 +++++++++----------
 1 file changed, 37 insertions(+), 44 deletions(-)
 rename src/components/views/elements/{DirectorySearchBox.js => DirectorySearchBox.tsx} (63%)

diff --git a/src/components/views/elements/DirectorySearchBox.js b/src/components/views/elements/DirectorySearchBox.tsx
similarity index 63%
rename from src/components/views/elements/DirectorySearchBox.js
rename to src/components/views/elements/DirectorySearchBox.tsx
index 11b1ed2cd2c..07407af6229 100644
--- a/src/components/views/elements/DirectorySearchBox.js
+++ b/src/components/views/elements/DirectorySearchBox.tsx
@@ -14,71 +14,73 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React from 'react';
-import PropTypes from 'prop-types';
-import * as sdk from '../../../index';
+import React, { ChangeEvent, createRef } from 'react';
 import { _t } from '../../../languageHandler';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import AccessibleButton from "./AccessibleButton";
+
+interface IProps {
+    className?: string;
+    onChange?: (value: string) => void;
+    onClear?: () => void;
+    onJoinClick?: (value: string) => void;
+    placeholder?: string;
+    showJoinButton?: boolean;
+    initialText?: string;
+}
+
+interface IState {
+    value: string;
+}
 
 @replaceableComponent("views.elements.DirectorySearchBox")
-export default class DirectorySearchBox extends React.Component {
-    constructor(props) {
-        super(props);
-        this._collectInput = this._collectInput.bind(this);
-        this._onClearClick = this._onClearClick.bind(this);
-        this._onChange = this._onChange.bind(this);
-        this._onKeyUp = this._onKeyUp.bind(this);
-        this._onJoinButtonClick = this._onJoinButtonClick.bind(this);
+export default class DirectorySearchBox extends React.Component<IProps, IState> {
+    private input = createRef<HTMLInputElement>();
 
-        this.input = null;
+    constructor(props: IProps) {
+        super(props);
 
         this.state = {
             value: this.props.initialText || '',
         };
     }
 
-    _collectInput(e) {
-        this.input = e;
-    }
-
-    _onClearClick() {
+    private onClearClick = (): void => {
         this.setState({ value: '' });
 
-        if (this.input) {
-            this.input.focus();
+        if (this.input.current) {
+            this.input.current.focus();
 
             if (this.props.onClear) {
                 this.props.onClear();
             }
         }
-    }
+    };
 
-    _onChange(ev) {
-        if (!this.input) return;
+    private onChange = (ev: ChangeEvent<HTMLInputElement>): void => {
+        if (!this.input.current) return;
         this.setState({ value: ev.target.value });
 
         if (this.props.onChange) {
             this.props.onChange(ev.target.value);
         }
-    }
+    };
 
-    _onKeyUp(ev) {
+    private onKeyUp = (ev: React.KeyboardEvent): void => {
         if (ev.key == 'Enter' && this.props.showJoinButton) {
             if (this.props.onJoinClick) {
                 this.props.onJoinClick(this.state.value);
             }
         }
-    }
+    };
 
-    _onJoinButtonClick() {
+    private onJoinButtonClick = (): void => {
         if (this.props.onJoinClick) {
             this.props.onJoinClick(this.state.value);
         }
-    }
-
-    render() {
-        const AccessibleButton = sdk.getComponent('elements.AccessibleButton');
+    };
 
+    public render(): JSX.Element {
         const searchboxClasses = {
             mx_DirectorySearchBox: true,
         };
@@ -87,7 +89,7 @@ export default class DirectorySearchBox extends React.Component {
         let joinButton;
         if (this.props.showJoinButton) {
             joinButton = <AccessibleButton className="mx_DirectorySearchBox_joinButton"
-                onClick={this._onJoinButtonClick}
+                onClick={this.onJoinButtonClick}
             >{ _t("Join") }</AccessibleButton>;
         }
 
@@ -97,24 +99,15 @@ export default class DirectorySearchBox extends React.Component {
                 name="dirsearch"
                 value={this.state.value}
                 className="mx_textinput_icon mx_textinput_search"
-                ref={this._collectInput}
-                onChange={this._onChange}
-                onKeyUp={this._onKeyUp}
+                ref={this.input}
+                onChange={this.onChange}
+                onKeyUp={this.onKeyUp}
                 placeholder={this.props.placeholder}
                 autoFocus
             />
             { joinButton }
-            <AccessibleButton className="mx_DirectorySearchBox_clear" onClick={this._onClearClick} />
+            <AccessibleButton className="mx_DirectorySearchBox_clear" onClick={this.onClearClick} />
         </div>;
     }
 }
 
-DirectorySearchBox.propTypes = {
-    className: PropTypes.string,
-    onChange: PropTypes.func,
-    onClear: PropTypes.func,
-    onJoinClick: PropTypes.func,
-    placeholder: PropTypes.string,
-    showJoinButton: PropTypes.bool,
-    initialText: PropTypes.string,
-};

From 17d2998ec1855611d5eed661482d47709ad59c4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 20:22:09 +0200
Subject: [PATCH 04/20] Convert EditableTextContainer to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 ...Container.js => EditableTextContainer.tsx} | 121 +++++++++---------
 1 file changed, 60 insertions(+), 61 deletions(-)
 rename src/components/views/elements/{EditableTextContainer.js => EditableTextContainer.tsx} (65%)

diff --git a/src/components/views/elements/EditableTextContainer.js b/src/components/views/elements/EditableTextContainer.tsx
similarity index 65%
rename from src/components/views/elements/EditableTextContainer.js
rename to src/components/views/elements/EditableTextContainer.tsx
index 5778446355e..9610b188fbb 100644
--- a/src/components/views/elements/EditableTextContainer.js
+++ b/src/components/views/elements/EditableTextContainer.tsx
@@ -15,9 +15,34 @@ limitations under the License.
 */
 
 import React from 'react';
-import PropTypes from 'prop-types';
-import * as sdk from '../../../index';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import Spinner from "./Spinner";
+import EditableText from "./EditableText";
+
+interface IProps {
+    /* callback to retrieve the initial value. */
+    getInitialValue?: () => Promise<string>;
+
+    /* initial value; used if getInitialValue is not given */
+    initialValue?: string;
+
+    /* placeholder text to use when the value is empty (and not being
+     * edited) */
+    placeholder?: string;
+
+    /* callback to update the value. Called with a single argument: the new
+     * value. */
+    onSubmit?: (value: string) => Promise<{} | void>;
+
+    /* should the input submit when focus is lost? */
+    blurToSubmit?: boolean;
+}
+
+interface IState {
+    busy: boolean;
+    errorString: string;
+    value: string;
+}
 
 /**
  * A component which wraps an EditableText, with a spinner while updates take
@@ -31,50 +56,51 @@ import { replaceableComponent } from "../../../utils/replaceableComponent";
  * taken from the 'initialValue' property.
  */
 @replaceableComponent("views.elements.EditableTextContainer")
-export default class EditableTextContainer extends React.Component {
-    constructor(props) {
+export default class EditableTextContainer extends React.Component<IProps, IState> {
+    private _unmounted = false;
+    public static defaultProps: Partial<IProps> = {
+        initialValue: "",
+        placeholder: "",
+        blurToSubmit: false,
+        onSubmit: () => { return Promise.resolve(); },
+    };
+
+    constructor(props: IProps) {
         super(props);
 
-        this._unmounted = false;
         this.state = {
             busy: false,
             errorString: null,
             value: props.initialValue,
         };
-        this._onValueChanged = this._onValueChanged.bind(this);
     }
 
-    componentDidMount() {
-        if (this.props.getInitialValue === undefined) {
-            // use whatever was given in the initialValue property.
-            return;
-        }
+    public async componentDidMount(): Promise<void> {
+        // use whatever was given in the initialValue property.
+        if (this.props.getInitialValue === undefined) return;
 
         this.setState({ busy: true });
-
-        this.props.getInitialValue().then(
-            (result) => {
-                if (this._unmounted) { return; }
-                this.setState({
-                    busy: false,
-                    value: result,
-                });
-            },
-            (error) => {
-                if (this._unmounted) { return; }
-                this.setState({
-                    errorString: error.toString(),
-                    busy: false,
-                });
-            },
-        );
+        try {
+            const initialValue = await this.props.getInitialValue();
+            if (this._unmounted) return;
+            this.setState({
+                busy: false,
+                value: initialValue,
+            });
+        } catch (error) {
+            if (this._unmounted) return;
+            this.setState({
+                errorString: error.toString(),
+                busy: false,
+            });
+        }
     }
 
-    componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._unmounted = true;
     }
 
-    _onValueChanged(value, shouldSubmit) {
+    private onValueChanged = (value: string, shouldSubmit: boolean): void => {
         if (!shouldSubmit) {
             return;
         }
@@ -100,24 +126,22 @@ export default class EditableTextContainer extends React.Component {
                 });
             },
         );
-    }
+    };
 
-    render() {
+    public render(): JSX.Element {
         if (this.state.busy) {
-            const Loader = sdk.getComponent("elements.Spinner");
             return (
-                <Loader />
+                <Spinner />
             );
         } else if (this.state.errorString) {
             return (
                 <div className="error">{ this.state.errorString }</div>
             );
         } else {
-            const EditableText = sdk.getComponent('elements.EditableText');
             return (
                 <EditableText initialValue={this.state.value}
                     placeholder={this.props.placeholder}
-                    onValueChanged={this._onValueChanged}
+                    onValueChanged={this.onValueChanged}
                     blurToSubmit={this.props.blurToSubmit}
                 />
             );
@@ -125,28 +149,3 @@ export default class EditableTextContainer extends React.Component {
     }
 }
 
-EditableTextContainer.propTypes = {
-    /* callback to retrieve the initial value. */
-    getInitialValue: PropTypes.func,
-
-    /* initial value; used if getInitialValue is not given */
-    initialValue: PropTypes.string,
-
-    /* placeholder text to use when the value is empty (and not being
-     * edited) */
-    placeholder: PropTypes.string,
-
-    /* callback to update the value. Called with a single argument: the new
-     * value. */
-    onSubmit: PropTypes.func,
-
-    /* should the input submit when focus is lost? */
-    blurToSubmit: PropTypes.bool,
-};
-
-EditableTextContainer.defaultProps = {
-    initialValue: "",
-    placeholder: "",
-    blurToSubmit: false,
-    onSubmit: function(v) {return Promise.resolve(); },
-};

From 1ee606c693fb3caa9ff8c00aba8f34f45c5cf491 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 20:35:30 +0200
Subject: [PATCH 05/20] Convert LanguageDropdown to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 ...nguageDropdown.js => LanguageDropdown.tsx} | 39 ++++++++++---------
 1 file changed, 21 insertions(+), 18 deletions(-)
 rename src/components/views/elements/{LanguageDropdown.js => LanguageDropdown.tsx} (84%)

diff --git a/src/components/views/elements/LanguageDropdown.js b/src/components/views/elements/LanguageDropdown.tsx
similarity index 84%
rename from src/components/views/elements/LanguageDropdown.js
rename to src/components/views/elements/LanguageDropdown.tsx
index 3f17a78629e..c6c52ee4e82 100644
--- a/src/components/views/elements/LanguageDropdown.js
+++ b/src/components/views/elements/LanguageDropdown.tsx
@@ -16,13 +16,13 @@ limitations under the License.
 */
 
 import React from 'react';
-import PropTypes from 'prop-types';
 
-import * as sdk from '../../../index';
 import * as languageHandler from '../../../languageHandler';
 import SettingsStore from "../../../settings/SettingsStore";
 import { _t } from "../../../languageHandler";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import Spinner from "./Spinner";
+import Dropdown from "./Dropdown";
 
 function languageMatchesSearchQuery(query, language) {
     if (language.label.toUpperCase().includes(query.toUpperCase())) return true;
@@ -30,11 +30,22 @@ function languageMatchesSearchQuery(query, language) {
     return false;
 }
 
+interface IProps {
+    className?: string;
+    onOptionChange: (language: string) => void;
+    value?: string;
+    disabled?: boolean;
+}
+
+interface IState {
+    searchQuery: string;
+    langs: string[];
+}
+
 @replaceableComponent("views.elements.LanguageDropdown")
-export default class LanguageDropdown extends React.Component {
-    constructor(props) {
+export default class LanguageDropdown extends React.Component<IProps, IState> {
+    constructor(props: IProps) {
         super(props);
-        this._onSearchChange = this._onSearchChange.bind(this);
 
         this.state = {
             searchQuery: '',
@@ -42,7 +53,7 @@ export default class LanguageDropdown extends React.Component {
         };
     }
 
-    componentDidMount() {
+    public componentDidMount(): void {
         languageHandler.getAllLanguagesFromJson().then((langs) => {
             langs.sort(function(a, b) {
                 if (a.label < b.label) return -1;
@@ -63,20 +74,17 @@ export default class LanguageDropdown extends React.Component {
         }
     }
 
-    _onSearchChange(search) {
+    private onSearchChange = (search: string): void => {
         this.setState({
             searchQuery: search,
         });
-    }
+    };
 
-    render() {
+    public render(): JSX.Element {
         if (this.state.langs === null) {
-            const Spinner = sdk.getComponent('elements.Spinner');
             return <Spinner />;
         }
 
-        const Dropdown = sdk.getComponent('elements.Dropdown');
-
         let displayedLanguages;
         if (this.state.searchQuery) {
             displayedLanguages = this.state.langs.filter((lang) => {
@@ -107,7 +115,7 @@ export default class LanguageDropdown extends React.Component {
             id="mx_LanguageDropdown"
             className={this.props.className}
             onOptionChange={this.props.onOptionChange}
-            onSearchChange={this._onSearchChange}
+            onSearchChange={this.onSearchChange}
             searchEnabled={true}
             value={value}
             label={_t("Language Dropdown")}
@@ -118,8 +126,3 @@ export default class LanguageDropdown extends React.Component {
     }
 }
 
-LanguageDropdown.propTypes = {
-    className: PropTypes.string,
-    onOptionChange: PropTypes.func.isRequired,
-    value: PropTypes.string,
-};

From 9e2bc28c06f121429ebe2253dd5d4936bc1edce0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 20:44:26 +0200
Subject: [PATCH 06/20] Convert LazyRenderList TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../{LazyRenderList.js => LazyRenderList.tsx} | 89 ++++++++++---------
 1 file changed, 49 insertions(+), 40 deletions(-)
 rename src/components/views/elements/{LazyRenderList.js => LazyRenderList.tsx} (79%)

diff --git a/src/components/views/elements/LazyRenderList.js b/src/components/views/elements/LazyRenderList.tsx
similarity index 79%
rename from src/components/views/elements/LazyRenderList.js
rename to src/components/views/elements/LazyRenderList.tsx
index 070d9bcc8da..65d578b56fa 100644
--- a/src/components/views/elements/LazyRenderList.js
+++ b/src/components/views/elements/LazyRenderList.tsx
@@ -15,17 +15,16 @@ limitations under the License.
 */
 
 import React from "react";
-import PropTypes from 'prop-types';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
 class ItemRange {
-    constructor(topCount, renderCount, bottomCount) {
-        this.topCount = topCount;
-        this.renderCount = renderCount;
-        this.bottomCount = bottomCount;
-    }
+    constructor(
+        public topCount: number,
+        public renderCount: number,
+        public bottomCount: number,
+    ) { }
 
-    contains(range) {
+    public contains(range: ItemRange): boolean {
         // don't contain empty ranges
         // as it will prevent clearing the list
         // once it is scrolled far enough out of view
@@ -36,7 +35,7 @@ class ItemRange {
             (range.topCount + range.renderCount) <= (this.topCount + this.renderCount);
     }
 
-    expand(amount) {
+    public expand(amount: number): ItemRange {
         // don't expand ranges that won't render anything
         if (this.renderCount === 0) {
             return this;
@@ -51,20 +50,55 @@ class ItemRange {
         );
     }
 
-    totalSize() {
+    public totalSize(): number {
         return this.topCount + this.renderCount + this.bottomCount;
     }
 }
 
+interface IProps<T extends unknown> {
+    // height in pixels of the component returned by `renderItem`
+    itemHeight: number;
+    // function to turn an element of `items` into a react component
+    renderItem: (item: T) => JSX.Element;
+    // scrollTop of the viewport (minus the height of any content above this list like other `LazyRenderList`s)
+    scrollTop: number;
+    // the height of the viewport this content is scrolled in
+    height: number;
+    // all items for the list. These should not be react components, see `renderItem`.
+    items?: T[];
+    // the amount of items to scroll before causing a rerender,
+    // should typically be less than `overflowItems` unless applying
+    // margins in the parent component when using multiple LazyRenderList in one viewport.
+    // use 0 to only rerender when items will come into view.
+    overflowMargin?: number;
+    // the amount of items to add at the top and bottom to render,
+    // so not every scroll of causes a rerender.
+    overflowItems?: number;
+
+    element?: string;
+    className?: string;
+}
+
+interface IState {
+    renderRange: ItemRange;
+}
+
 @replaceableComponent("views.elements.LazyRenderList")
-export default class LazyRenderList extends React.Component {
-    constructor(props) {
+export default class LazyRenderList extends React.Component<IProps<unknown>, IState> {
+    public static defaultProps: Partial<IProps<unknown>> = {
+        overflowItems: 20,
+        overflowMargin: 5,
+    };
+
+    constructor(props: IProps<unknown>) {
         super(props);
 
-        this.state = {};
+        this.state = {
+            renderRange: null,
+        };
     }
 
-    static getDerivedStateFromProps(props, state) {
+    public static getDerivedStateFromProps(props: IProps<unknown>, state: IState): Partial<IState> {
         const range = LazyRenderList.getVisibleRangeFromProps(props);
         const intersectRange = range.expand(props.overflowMargin);
         const renderRange = range.expand(props.overflowItems);
@@ -77,7 +111,7 @@ export default class LazyRenderList extends React.Component {
         return null;
     }
 
-    static getVisibleRangeFromProps(props) {
+    private static getVisibleRangeFromProps(props: IProps<unknown>): ItemRange {
         const { items, itemHeight, scrollTop, height } = props;
         const length = items ? items.length : 0;
         const topCount = Math.min(Math.max(0, Math.floor(scrollTop / itemHeight)), length);
@@ -88,7 +122,7 @@ export default class LazyRenderList extends React.Component {
         return new ItemRange(topCount, renderCount, bottomCount);
     }
 
-    render() {
+    public render(): JSX.Element {
         const { itemHeight, items, renderItem } = this.props;
         const { renderRange } = this.state;
         const { topCount, renderCount, bottomCount } = renderRange;
@@ -109,28 +143,3 @@ export default class LazyRenderList extends React.Component {
     }
 }
 
-LazyRenderList.defaultProps = {
-    overflowItems: 20,
-    overflowMargin: 5,
-};
-
-LazyRenderList.propTypes = {
-    // height in pixels of the component returned by `renderItem`
-    itemHeight: PropTypes.number.isRequired,
-    // function to turn an element of `items` into a react component
-    renderItem: PropTypes.func.isRequired,
-    // scrollTop of the viewport (minus the height of any content above this list like other `LazyRenderList`s)
-    scrollTop: PropTypes.number.isRequired,
-    // the height of the viewport this content is scrolled in
-    height: PropTypes.number.isRequired,
-    // all items for the list. These should not be react components, see `renderItem`.
-    items: PropTypes.array,
-    // the amount of items to scroll before causing a rerender,
-    // should typically be less than `overflowItems` unless applying
-    // margins in the parent component when using multiple LazyRenderList in one viewport.
-    // use 0 to only rerender when items will come into view.
-    overflowMargin: PropTypes.number,
-    // the amount of items to add at the top and bottom to render,
-    // so not every scroll of causes a rerender.
-    overflowItems: PropTypes.number,
-};

From 96d1519ac5b2c3b1ab92233a00b17c4a0f2d9c1b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 20:47:49 +0200
Subject: [PATCH 07/20] Convert Spoiler to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../elements/{Spoiler.js => Spoiler.tsx}      | 21 +++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)
 rename src/components/views/elements/{Spoiler.js => Spoiler.tsx} (82%)

diff --git a/src/components/views/elements/Spoiler.js b/src/components/views/elements/Spoiler.tsx
similarity index 82%
rename from src/components/views/elements/Spoiler.js
rename to src/components/views/elements/Spoiler.tsx
index 802c6cf8412..4779a7d90e1 100644
--- a/src/components/views/elements/Spoiler.js
+++ b/src/components/views/elements/Spoiler.tsx
@@ -17,25 +17,34 @@
 import React from 'react';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
+interface IProps {
+    reason?: string;
+    contentHtml: string;
+}
+
+interface IState {
+    visible: boolean;
+}
+
 @replaceableComponent("views.elements.Spoiler")
-export default class Spoiler extends React.Component {
-    constructor(props) {
+export default class Spoiler extends React.Component<IProps, IState> {
+    constructor(props: IProps) {
         super(props);
         this.state = {
             visible: false,
         };
     }
 
-    toggleVisible(e) {
+    private toggleVisible = (e: React.MouseEvent): void => {
         if (!this.state.visible) {
             // we are un-blurring, we don't want this click to propagate to potential child pills
             e.preventDefault();
             e.stopPropagation();
         }
         this.setState({ visible: !this.state.visible });
-    }
+    };
 
-    render() {
+    public render(): JSX.Element {
         const reason = this.props.reason ? (
             <span className="mx_EventTile_spoiler_reason">{ "(" + this.props.reason + ")" }</span>
         ) : null;
@@ -43,7 +52,7 @@ export default class Spoiler extends React.Component {
         // as such, we pass the this.props.contentHtml instead and then set the raw
         // HTML content. This is secure as the contents have already been parsed previously
         return (
-            <span className={"mx_EventTile_spoiler" + (this.state.visible ? " visible" : "")} onClick={this.toggleVisible.bind(this)}>
+            <span className={"mx_EventTile_spoiler" + (this.state.visible ? " visible" : "")} onClick={this.toggleVisible}>
                 { reason }
                 &nbsp;
                 <span className="mx_EventTile_spoiler_content" dangerouslySetInnerHTML={{ __html: this.props.contentHtml }} />

From 8bf5d97b9e70812714331774271f1777b4a617e8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 21:06:06 +0200
Subject: [PATCH 08/20] Convert TextWithTooltip to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 ...TextWithTooltip.js => TextWithTooltip.tsx} | 38 ++++++++++---------
 1 file changed, 20 insertions(+), 18 deletions(-)
 rename src/components/views/elements/{TextWithTooltip.js => TextWithTooltip.tsx} (71%)

diff --git a/src/components/views/elements/TextWithTooltip.js b/src/components/views/elements/TextWithTooltip.tsx
similarity index 71%
rename from src/components/views/elements/TextWithTooltip.js
rename to src/components/views/elements/TextWithTooltip.tsx
index 288d33f71b1..b7c24771588 100644
--- a/src/components/views/elements/TextWithTooltip.js
+++ b/src/components/views/elements/TextWithTooltip.tsx
@@ -15,42 +15,44 @@
  */
 
 import React from 'react';
-import PropTypes from 'prop-types';
-import * as sdk from '../../../index';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import Tooltip from "./Tooltip";
 
-@replaceableComponent("views.elements.TextWithTooltip")
-export default class TextWithTooltip extends React.Component {
-    static propTypes = {
-        class: PropTypes.string,
-        tooltipClass: PropTypes.string,
-        tooltip: PropTypes.node.isRequired,
-        tooltipProps: PropTypes.object,
-    };
+interface IProps {
+    class?: string;
+    tooltipClass?: string;
+    tooltip: React.ReactNode;
+    tooltipProps?: {};
+    onClick?: (ev?: React.MouseEvent) => void;
+}
 
-    constructor() {
-        super();
+interface IState {
+    hover: boolean;
+}
+
+@replaceableComponent("views.elements.TextWithTooltip")
+export default class TextWithTooltip extends React.Component<IProps, IState> {
+    constructor(props: IProps) {
+        super(props);
 
         this.state = {
             hover: false,
         };
     }
 
-    onMouseOver = () => {
+    private onMouseOver = (): void => {
         this.setState({ hover: true });
     };
 
-    onMouseLeave = () => {
+    private onMouseLeave = (): void => {
         this.setState({ hover: false });
     };
 
-    render() {
-        const Tooltip = sdk.getComponent("elements.Tooltip");
-
+    public render(): JSX.Element {
         const { class: className, children, tooltip, tooltipClass, tooltipProps, ...props } = this.props;
 
         return (
-            <span {...props} onMouseOver={this.onMouseOver} onMouseLeave={this.onMouseLeave} className={className}>
+            <span {...props} onMouseOver={this.onMouseOver} onMouseLeave={this.onMouseLeave} onClick={this.props.onClick} className={className}>
                 { children }
                 { this.state.hover && <Tooltip
                     {...tooltipProps}

From 6f2ef34dd7c8c83eb7fcc9d07f243dfa2fb052ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Wed, 15 Sep 2021 21:09:23 +0200
Subject: [PATCH 09/20] Convert SyntaxHighlight to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 ...SyntaxHighlight.js => SyntaxHighlight.tsx} | 32 +++++++++----------
 1 file changed, 16 insertions(+), 16 deletions(-)
 rename src/components/views/elements/{SyntaxHighlight.js => SyntaxHighlight.tsx} (73%)

diff --git a/src/components/views/elements/SyntaxHighlight.js b/src/components/views/elements/SyntaxHighlight.tsx
similarity index 73%
rename from src/components/views/elements/SyntaxHighlight.js
rename to src/components/views/elements/SyntaxHighlight.tsx
index 2c29f7c989b..cd65cddfba0 100644
--- a/src/components/views/elements/SyntaxHighlight.js
+++ b/src/components/views/elements/SyntaxHighlight.tsx
@@ -15,40 +15,40 @@ limitations under the License.
 */
 
 import React from 'react';
-import PropTypes from 'prop-types';
 import { highlightBlock } from 'highlight.js';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
+interface IProps {
+    className?: string;
+    children?: React.ReactNode;
+}
+
 @replaceableComponent("views.elements.SyntaxHighlight")
-export default class SyntaxHighlight extends React.Component {
-    static propTypes = {
-        className: PropTypes.string,
-        children: PropTypes.node,
-    };
+export default class SyntaxHighlight extends React.Component<IProps> {
+    private el: HTMLPreElement = null;
 
-    constructor(props) {
+    constructor(props: IProps) {
         super(props);
-
-        this._ref = this._ref.bind(this);
     }
 
     // componentDidUpdate used here for reusability
-    componentDidUpdate() {
-        if (this._el) highlightBlock(this._el);
+    public componentDidUpdate(): void {
+        if (this.el) highlightBlock(this.el);
     }
 
     // call componentDidUpdate because _ref is fired on initial render
     // which does not fire componentDidUpdate
-    _ref(el) {
-        this._el = el;
+    private ref = (el: HTMLPreElement): void => {
+        this.el = el;
         this.componentDidUpdate();
-    }
+    };
 
-    render() {
+    public render(): JSX.Element {
         const { className, children } = this.props;
 
-        return <pre className={`${className} mx_SyntaxHighlight`} ref={this._ref}>
+        return <pre className={`${className} mx_SyntaxHighlight`} ref={this.ref}>
             <code>{ children }</code>
         </pre>;
     }
 }
+

From 819a2b4416905d4cf28934d69a1de8ca6d695c93 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Thu, 16 Sep 2021 17:55:51 +0200
Subject: [PATCH 10/20] Convert PowerSelector to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../{PowerSelector.js => PowerSelector.tsx}   | 102 ++++++++++--------
 1 file changed, 57 insertions(+), 45 deletions(-)
 rename src/components/views/elements/{PowerSelector.js => PowerSelector.tsx} (61%)

diff --git a/src/components/views/elements/PowerSelector.js b/src/components/views/elements/PowerSelector.tsx
similarity index 61%
rename from src/components/views/elements/PowerSelector.js
rename to src/components/views/elements/PowerSelector.tsx
index 42386ca5c11..f6e24f2bbb4 100644
--- a/src/components/views/elements/PowerSelector.js
+++ b/src/components/views/elements/PowerSelector.tsx
@@ -15,40 +15,52 @@ limitations under the License.
 */
 
 import React from 'react';
-import PropTypes from 'prop-types';
 import * as Roles from '../../../Roles';
 import { _t } from '../../../languageHandler';
 import Field from "./Field";
 import { Key } from "../../../Keyboard";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
-@replaceableComponent("views.elements.PowerSelector")
-export default class PowerSelector extends React.Component {
-    static propTypes = {
-        value: PropTypes.number.isRequired,
-        // The maximum value that can be set with the power selector
-        maxValue: PropTypes.number.isRequired,
+const CUSTOM_VALUE = "SELECT_VALUE_CUSTOM";
 
-        // Default user power level for the room
-        usersDefault: PropTypes.number.isRequired,
+interface IProps {
+    value: number;
+    // The maximum value that can be set with the power selector
+    maxValue: number;
 
-        // should the user be able to change the value? false by default.
-        disabled: PropTypes.bool,
-        onChange: PropTypes.func,
+    // Default user power level for the room
+    usersDefault: number;
 
-        // Optional key to pass as the second argument to `onChange`
-        powerLevelKey: PropTypes.string,
+    // should the user be able to change the value? false by default.
+    disabled?: boolean;
+    onChange?: (value: string, powerLevelKey: string) => void;
 
-        // The name to annotate the selector with
-        label: PropTypes.string,
-    }
+    // Optional key to pass as the second argument to `onChange`
+    powerLevelKey?: string;
+
+    // The name to annotate the selector with
+    label?: string;
+}
+
+interface IState {
+    levelRoleMap: {};
+    // List of power levels to show in the drop-down
+    options: number[];
 
-    static defaultProps = {
+    customValue: number;
+    selectValue: number | string;
+    custom?: boolean;
+    customLevel?: number;
+}
+
+@replaceableComponent("views.elements.PowerSelector")
+export default class PowerSelector extends React.Component<IProps, IState> {
+    public static defaultProps: Partial<IProps> = {
         maxValue: Infinity,
         usersDefault: 0,
     };
 
-    constructor(props) {
+    constructor(props: IProps) {
         super(props);
 
         this.state = {
@@ -62,26 +74,26 @@ export default class PowerSelector extends React.Component {
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    // eslint-disable-next-line camelcase
-    UNSAFE_componentWillMount() {
-        this._initStateFromProps(this.props);
+    // eslint-disable-next-line camelcase, @typescript-eslint/naming-convention
+    public UNSAFE_componentWillMount(): void {
+        this.initStateFromProps(this.props);
     }
 
-    // eslint-disable-next-line camelcase
-    UNSAFE_componentWillReceiveProps(newProps) {
-        this._initStateFromProps(newProps);
+    // eslint-disable-next-line camelcase, @typescript-eslint/naming-convention
+    public UNSAFE_componentWillReceiveProps(newProps: IProps): void {
+        this.initStateFromProps(newProps);
     }
 
-    _initStateFromProps(newProps) {
+    private initStateFromProps(newProps: IProps): void {
         // This needs to be done now because levelRoleMap has translated strings
         const levelRoleMap = Roles.levelRoleMap(newProps.usersDefault);
         const options = Object.keys(levelRoleMap).filter(level => {
             return (
                 level === undefined ||
-                level <= newProps.maxValue ||
-                level == newProps.value
+                parseInt(level) <= newProps.maxValue ||
+                parseInt(level) == newProps.value
             );
-        });
+        }).map(level => parseInt(level));
 
         const isCustom = levelRoleMap[newProps.value] === undefined;
 
@@ -90,32 +102,32 @@ export default class PowerSelector extends React.Component {
             options,
             custom: isCustom,
             customLevel: newProps.value,
-            selectValue: isCustom ? "SELECT_VALUE_CUSTOM" : newProps.value,
+            selectValue: isCustom ? CUSTOM_VALUE : newProps.value,
         });
     }
 
-    onSelectChange = event => {
-        const isCustom = event.target.value === "SELECT_VALUE_CUSTOM";
+    private onSelectChange = (event: React.ChangeEvent<HTMLSelectElement>): void => {
+        const isCustom = event.target.value === CUSTOM_VALUE;
         if (isCustom) {
             this.setState({ custom: true });
         } else {
             this.props.onChange(event.target.value, this.props.powerLevelKey);
-            this.setState({ selectValue: event.target.value });
+            this.setState({ selectValue: parseInt(event.target.value) });
         }
     };
 
-    onCustomChange = event => {
-        this.setState({ customValue: event.target.value });
+    private onCustomChange = (event: React.ChangeEvent<HTMLInputElement>): void => {
+        this.setState({ customValue: parseInt(event.target.value) });
     };
 
-    onCustomBlur = event => {
+    private onCustomBlur = (event: React.FocusEvent): void => {
         event.preventDefault();
         event.stopPropagation();
 
-        this.props.onChange(parseInt(this.state.customValue), this.props.powerLevelKey);
+        this.props.onChange(String(this.state.customValue), this.props.powerLevelKey);
     };
 
-    onCustomKeyDown = event => {
+    private onCustomKeyDown = (event: React.KeyboardEvent<HTMLInputElement>): void => {
         if (event.key === Key.ENTER) {
             event.preventDefault();
             event.stopPropagation();
@@ -125,11 +137,11 @@ export default class PowerSelector extends React.Component {
             // raising a dialog which causes a blur which causes a dialog which causes a blur and
             // so on. By not causing the onChange to be called here, we avoid the loop because we
             // handle the onBlur safely.
-            event.target.blur();
+            (event.target as HTMLInputElement).blur();
         }
     };
 
-    render() {
+    public render(): JSX.Element {
         let picker;
         const label = typeof this.props.label === "undefined" ? _t("Power level") : this.props.label;
         if (this.state.custom) {
@@ -147,14 +159,14 @@ export default class PowerSelector extends React.Component {
             );
         } else {
             // Each level must have a definition in this.state.levelRoleMap
-            let options = this.state.options.map((level) => {
+            const options = this.state.options.map((level) => {
                 return {
-                    value: level,
+                    value: String(level),
                     text: Roles.textualPowerLevel(level, this.props.usersDefault),
                 };
             });
-            options.push({ value: "SELECT_VALUE_CUSTOM", text: _t("Custom level") });
-            options = options.map((op) => {
+            options.push({ value: CUSTOM_VALUE, text: _t("Custom level") });
+            const optionsElements = options.map((op) => {
                 return <option value={op.value} key={op.value}>{ op.text }</option>;
             });
 
@@ -166,7 +178,7 @@ export default class PowerSelector extends React.Component {
                     value={String(this.state.selectValue)}
                     disabled={this.props.disabled}
                 >
-                    { options }
+                    { optionsElements }
                 </Field>
             );
         }

From a8d3bb76efb8f5437a6a79f7b3bae78a513b9381 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Thu, 16 Sep 2021 18:46:18 +0200
Subject: [PATCH 11/20] Convert PersistentApp to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../{PersistentApp.js => PersistentApp.tsx}   | 54 +++++++++++--------
 1 file changed, 33 insertions(+), 21 deletions(-)
 rename src/components/views/elements/{PersistentApp.js => PersistentApp.tsx} (72%)

diff --git a/src/components/views/elements/PersistentApp.js b/src/components/views/elements/PersistentApp.tsx
similarity index 72%
rename from src/components/views/elements/PersistentApp.js
rename to src/components/views/elements/PersistentApp.tsx
index 763ab634873..1f911659e2f 100644
--- a/src/components/views/elements/PersistentApp.js
+++ b/src/components/views/elements/PersistentApp.tsx
@@ -19,57 +19,70 @@ import React from 'react';
 import RoomViewStore from '../../../stores/RoomViewStore';
 import ActiveWidgetStore from '../../../stores/ActiveWidgetStore';
 import WidgetUtils from '../../../utils/WidgetUtils';
-import * as sdk from '../../../index';
 import { MatrixClientPeg } from '../../../MatrixClientPeg';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { EventSubscription } from 'fbemitter';
+import AppTile from "./AppTile";
+import { Room } from "matrix-js-sdk/src/models/room";
+
+interface IState {
+    roomId: string;
+    persistentWidgetId: string;
+}
 
 @replaceableComponent("views.elements.PersistentApp")
-export default class PersistentApp extends React.Component {
-    state = {
-        roomId: RoomViewStore.getRoomId(),
-        persistentWidgetId: ActiveWidgetStore.getPersistentWidgetId(),
-    };
+export default class PersistentApp extends React.Component<{}, IState> {
+    private roomStoreToken: EventSubscription;
+
+    constructor() {
+        super({});
+
+        this.state = {
+            roomId: RoomViewStore.getRoomId(),
+            persistentWidgetId: ActiveWidgetStore.getPersistentWidgetId(),
+        };
+    }
 
-    componentDidMount() {
-        this._roomStoreToken = RoomViewStore.addListener(this._onRoomViewStoreUpdate);
-        ActiveWidgetStore.on('update', this._onActiveWidgetStoreUpdate);
-        MatrixClientPeg.get().on("Room.myMembership", this._onMyMembership);
+    public componentDidMount(): void {
+        this.roomStoreToken = RoomViewStore.addListener(this.onRoomViewStoreUpdate);
+        ActiveWidgetStore.on('update', this.onActiveWidgetStoreUpdate);
+        MatrixClientPeg.get().on("Room.myMembership", this.onMyMembership);
     }
 
-    componentWillUnmount() {
-        if (this._roomStoreToken) {
-            this._roomStoreToken.remove();
+    public componentWillUnmount(): void {
+        if (this.roomStoreToken) {
+            this.roomStoreToken.remove();
         }
-        ActiveWidgetStore.removeListener('update', this._onActiveWidgetStoreUpdate);
+        ActiveWidgetStore.removeListener('update', this.onActiveWidgetStoreUpdate);
         if (MatrixClientPeg.get()) {
-            MatrixClientPeg.get().removeListener("Room.myMembership", this._onMyMembership);
+            MatrixClientPeg.get().removeListener("Room.myMembership", this.onMyMembership);
         }
     }
 
-    _onRoomViewStoreUpdate = payload => {
+    private onRoomViewStoreUpdate = (): void => {
         if (RoomViewStore.getRoomId() === this.state.roomId) return;
         this.setState({
             roomId: RoomViewStore.getRoomId(),
         });
     };
 
-    _onActiveWidgetStoreUpdate = () => {
+    private onActiveWidgetStoreUpdate = (): void => {
         this.setState({
             persistentWidgetId: ActiveWidgetStore.getPersistentWidgetId(),
         });
     };
 
-    _onMyMembership = async (room, membership) => {
+    private onMyMembership = async (room: Room, membership: string): Promise<void> => {
         const persistentWidgetInRoomId = ActiveWidgetStore.getRoomId(this.state.persistentWidgetId);
         if (membership !== "join") {
             // we're not in the room anymore - delete
-            if (room.roomId === persistentWidgetInRoomId) {
+            if (room .roomId === persistentWidgetInRoomId) {
                 ActiveWidgetStore.destroyPersistentWidget(this.state.persistentWidgetId);
             }
         }
     };
 
-    render() {
+    public render(): JSX.Element {
         if (this.state.persistentWidgetId) {
             const persistentWidgetInRoomId = ActiveWidgetStore.getRoomId(this.state.persistentWidgetId);
 
@@ -89,7 +102,6 @@ export default class PersistentApp extends React.Component {
                     appEvent.getStateKey(), appEvent.getContent(), appEvent.getSender(),
                     persistentWidgetInRoomId, appEvent.getId(),
                 );
-                const AppTile = sdk.getComponent('elements.AppTile');
                 return <AppTile
                     key={app.id}
                     app={app}

From cebf256dc00ad2ae945424f93d3d99ac03f9ef7d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Thu, 16 Sep 2021 18:57:32 +0200
Subject: [PATCH 12/20] Convert PersistedElement to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 ...rsistedElement.js => PersistedElement.tsx} | 101 +++++++++---------
 1 file changed, 50 insertions(+), 51 deletions(-)
 rename src/components/views/elements/{PersistedElement.js => PersistedElement.tsx} (69%)

diff --git a/src/components/views/elements/PersistedElement.js b/src/components/views/elements/PersistedElement.tsx
similarity index 69%
rename from src/components/views/elements/PersistedElement.js
rename to src/components/views/elements/PersistedElement.tsx
index 03aa9e0d6de..8dda530097c 100644
--- a/src/components/views/elements/PersistedElement.js
+++ b/src/components/views/elements/PersistedElement.tsx
@@ -16,25 +16,26 @@ limitations under the License.
 
 import React from 'react';
 import ReactDOM from 'react-dom';
-import PropTypes from 'prop-types';
 import { throttle } from "lodash";
-import ResizeObserver from 'resize-observer-polyfill';
 
 import dis from '../../../dispatcher/dispatcher';
 import MatrixClientContext from "../../../contexts/MatrixClientContext";
 import { MatrixClientPeg } from "../../../MatrixClientPeg";
 import { isNullOrUndefined } from "matrix-js-sdk/src/utils";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { ActionPayload } from "../../../dispatcher/payloads";
+
+export const getPersistKey = (appId: string) => 'widget_' + appId;
 
 // Shamelessly ripped off Modal.js.  There's probably a better way
 // of doing reusable widgets like dialog boxes & menus where we go and
 // pass in a custom control as the actual body.
 
-function getContainer(containerId) {
-    return document.getElementById(containerId);
+function getContainer(containerId: string): HTMLDivElement {
+    return document.getElementById(containerId) as HTMLDivElement;
 }
 
-function getOrCreateContainer(containerId) {
+function getOrCreateContainer(containerId: string): HTMLDivElement {
     let container = getContainer(containerId);
 
     if (!container) {
@@ -46,7 +47,19 @@ function getOrCreateContainer(containerId) {
     return container;
 }
 
-/*
+interface IProps {
+    // Unique identifier for this PersistedElement instance
+    // Any PersistedElements with the same persistKey will use
+    // the same DOM container.
+    persistKey: string;
+
+    // z-index for the element. Defaults to 9.
+    zIndex?: number;
+
+    style?: React.StyleHTMLAttributes<HTMLDivElement>;
+}
+
+/**
  * Class of component that renders its children in a separate ReactDOM virtual tree
  * in a container element appended to document.body.
  *
@@ -58,53 +71,40 @@ function getOrCreateContainer(containerId) {
  * bounding rect as the parent of PE.
  */
 @replaceableComponent("views.elements.PersistedElement")
-export default class PersistedElement extends React.Component {
-    static propTypes = {
-        // Unique identifier for this PersistedElement instance
-        // Any PersistedElements with the same persistKey will use
-        // the same DOM container.
-        persistKey: PropTypes.string.isRequired,
-
-        // z-index for the element. Defaults to 9.
-        zIndex: PropTypes.number,
-    };
+export default class PersistedElement extends React.Component<IProps> {
+    private resizeObserver: ResizeObserver;
+    private dispatcherRef: string;
+    private childContainer: HTMLDivElement;
+    private child: HTMLDivElement;
 
-    constructor() {
-        super();
-        this.collectChildContainer = this.collectChildContainer.bind(this);
-        this.collectChild = this.collectChild.bind(this);
-        this._repositionChild = this._repositionChild.bind(this);
-        this._onAction = this._onAction.bind(this);
+    constructor(props: IProps) {
+        super(props);
 
-        this.resizeObserver = new ResizeObserver(this._repositionChild);
+        this.resizeObserver = new ResizeObserver(this.repositionChild);
         // Annoyingly, a resize observer is insufficient, since we also care
         // about when the element moves on the screen without changing its
         // dimensions. Doesn't look like there's a ResizeObserver equivalent
         // for this, so we bodge it by listening for document resize and
         // the timeline_resize action.
-        window.addEventListener('resize', this._repositionChild);
-        this._dispatcherRef = dis.register(this._onAction);
+        window.addEventListener('resize', this.repositionChild);
+        this.dispatcherRef = dis.register(this.onAction);
     }
 
     /**
      * Removes the DOM elements created when a PersistedElement with the given
      * persistKey was mounted. The DOM elements will be re-added if another
-     * PeristedElement is mounted in the future.
+     * PersistedElement is mounted in the future.
      *
      * @param {string} persistKey Key used to uniquely identify this PersistedElement
      */
-    static destroyElement(persistKey) {
+    public static destroyElement(persistKey: string): void {
         const container = getContainer('mx_persistedElement_' + persistKey);
         if (container) {
             container.remove();
         }
     }
 
-    static isMounted(persistKey) {
-        return Boolean(getContainer('mx_persistedElement_' + persistKey));
-    }
-
-    collectChildContainer(ref) {
+    private collectChildContainer = (ref: HTMLDivElement): void => {
         if (this.childContainer) {
             this.resizeObserver.unobserve(this.childContainer);
         }
@@ -112,48 +112,48 @@ export default class PersistedElement extends React.Component {
         if (ref) {
             this.resizeObserver.observe(ref);
         }
-    }
+    };
 
-    collectChild(ref) {
+    private collectChild = (ref: HTMLDivElement): void => {
         this.child = ref;
         this.updateChild();
-    }
+    };
 
-    componentDidMount() {
+    public componentDidMount(): void {
         this.updateChild();
         this.renderApp();
     }
 
-    componentDidUpdate() {
+    public componentDidUpdate(): void {
         this.updateChild();
         this.renderApp();
     }
 
-    componentWillUnmount() {
+    public componentWillUnmount(): void {
         this.updateChildVisibility(this.child, false);
         this.resizeObserver.disconnect();
-        window.removeEventListener('resize', this._repositionChild);
-        dis.unregister(this._dispatcherRef);
+        window.removeEventListener('resize', this.repositionChild);
+        dis.unregister(this.dispatcherRef);
     }
 
-    _onAction(payload) {
+    private onAction = (payload: ActionPayload): void => {
         if (payload.action === 'timeline_resize') {
-            this._repositionChild();
+            this.repositionChild();
         } else if (payload.action === 'logout') {
             PersistedElement.destroyElement(this.props.persistKey);
         }
-    }
+    };
 
-    _repositionChild() {
+    private repositionChild = (): void => {
         this.updateChildPosition(this.child, this.childContainer);
-    }
+    };
 
-    updateChild() {
+    private updateChild(): void {
         this.updateChildPosition(this.child, this.childContainer);
         this.updateChildVisibility(this.child, true);
     }
 
-    renderApp() {
+    private renderApp(): void {
         const content = <MatrixClientContext.Provider value={MatrixClientPeg.get()}>
             <div ref={this.collectChild} style={this.props.style}>
                 { this.props.children }
@@ -163,12 +163,12 @@ export default class PersistedElement extends React.Component {
         ReactDOM.render(content, getOrCreateContainer('mx_persistedElement_'+this.props.persistKey));
     }
 
-    updateChildVisibility(child, visible) {
+    private updateChildVisibility(child: HTMLDivElement, visible: boolean): void {
         if (!child) return;
         child.style.display = visible ? 'block' : 'none';
     }
 
-    updateChildPosition = throttle((child, parent) => {
+    private updateChildPosition = throttle((child: HTMLDivElement, parent: HTMLDivElement): void => {
         if (!child || !parent) return;
 
         const parentRect = parent.getBoundingClientRect();
@@ -182,9 +182,8 @@ export default class PersistedElement extends React.Component {
         });
     }, 100, { trailing: true, leading: true });
 
-    render() {
+    public render(): JSX.Element {
         return <div ref={this.collectChildContainer} />;
     }
 }
 
-export const getPersistKey = (appId) => 'widget_' + appId;

From af853e1d86aa71fe78ed24a2b2ca780453df4b7a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Thu, 16 Sep 2021 19:16:36 +0200
Subject: [PATCH 13/20] Convert DialogButtons to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../eventindex/ManageEventIndexDialog.tsx     |  5 +-
 .../views/dialogs/CryptoStoreTooNewDialog.tsx |  5 +-
 .../{DialogButtons.js => DialogButtons.tsx}   | 71 ++++++++++---------
 3 files changed, 40 insertions(+), 41 deletions(-)
 rename src/components/views/elements/{DialogButtons.js => DialogButtons.tsx} (64%)

diff --git a/src/async-components/views/dialogs/eventindex/ManageEventIndexDialog.tsx b/src/async-components/views/dialogs/eventindex/ManageEventIndexDialog.tsx
index 2748fda35ac..ac7875b920a 100644
--- a/src/async-components/views/dialogs/eventindex/ManageEventIndexDialog.tsx
+++ b/src/async-components/views/dialogs/eventindex/ManageEventIndexDialog.tsx
@@ -26,10 +26,9 @@ import { SettingLevel } from "../../../../settings/SettingLevel";
 import Field from '../../../../components/views/elements/Field';
 import BaseDialog from "../../../../components/views/dialogs/BaseDialog";
 import DialogButtons from "../../../../components/views/elements/DialogButtons";
+import { IDialogProps } from "../../../../components/views/dialogs/IDialogProps";
 
-interface IProps {
-    onFinished: (confirmed: boolean) => void;
-}
+interface IProps extends IDialogProps {}
 
 interface IState {
     eventIndexSize: number;
diff --git a/src/components/views/dialogs/CryptoStoreTooNewDialog.tsx b/src/components/views/dialogs/CryptoStoreTooNewDialog.tsx
index d03b668cd93..3bb78233eac 100644
--- a/src/components/views/dialogs/CryptoStoreTooNewDialog.tsx
+++ b/src/components/views/dialogs/CryptoStoreTooNewDialog.tsx
@@ -23,10 +23,9 @@ import Modal from '../../../Modal';
 import BaseDialog from "./BaseDialog";
 import DialogButtons from "../elements/DialogButtons";
 import QuestionDialog from "./QuestionDialog";
+import { IDialogProps } from "./IDialogProps";
 
-interface IProps {
-    onFinished: (success: boolean) => void;
-}
+interface IProps extends IDialogProps {}
 
 const CryptoStoreTooNewDialog: React.FC<IProps> = (props: IProps) => {
     const brand = SdkConfig.get().brand;
diff --git a/src/components/views/elements/DialogButtons.js b/src/components/views/elements/DialogButtons.tsx
similarity index 64%
rename from src/components/views/elements/DialogButtons.js
rename to src/components/views/elements/DialogButtons.tsx
index 9dd4a84b9a6..0dff64c0b4b 100644
--- a/src/components/views/elements/DialogButtons.js
+++ b/src/components/views/elements/DialogButtons.tsx
@@ -17,60 +17,61 @@ limitations under the License.
 */
 
 import React from "react";
-import PropTypes from "prop-types";
 import { _t } from '../../../languageHandler';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
-/**
- * Basic container for buttons in modal dialogs.
- */
-@replaceableComponent("views.elements.DialogButtons")
-export default class DialogButtons extends React.Component {
-    static propTypes = {
-        // The primary button which is styled differently and has default focus.
-        primaryButton: PropTypes.node.isRequired,
+interface IProps {
+    // The primary button which is styled differently and has default focus.
+    primaryButton: React.ReactNode;
 
-        // A node to insert into the cancel button instead of default "Cancel"
-        cancelButton: PropTypes.node,
+    // A node to insert into the cancel button instead of default "Cancel"
+    cancelButton?: React.ReactNode;
 
-        // If true, make the primary button a form submit button (input type="submit")
-        primaryIsSubmit: PropTypes.bool,
+    // If true, make the primary button a form submit button (input type="submit")
+    primaryIsSubmit?: boolean;
 
-        // onClick handler for the primary button.
-        onPrimaryButtonClick: PropTypes.func,
+    // onClick handler for the primary button.
+    onPrimaryButtonClick?: (ev: React.MouseEvent) => void;
 
-        // should there be a cancel button? default: true
-        hasCancel: PropTypes.bool,
+    // should there be a cancel button? default: true
+    hasCancel?: boolean;
 
-        // The class of the cancel button, only used if a cancel button is
-        // enabled
-        cancelButtonClass: PropTypes.node,
+    // The class of the cancel button, only used if a cancel button is
+    // enabled
+    cancelButtonClass?: string;
 
-        // onClick handler for the cancel button.
-        onCancel: PropTypes.func,
+    // onClick handler for the cancel button.
+    onCancel?: (...args: any[]) => void;
 
-        focus: PropTypes.bool,
+    focus?: boolean;
 
-        // disables the primary and cancel buttons
-        disabled: PropTypes.bool,
+    // disables the primary and cancel buttons
+    disabled?: boolean;
 
-        // disables only the primary button
-        primaryDisabled: PropTypes.bool,
+    // disables only the primary button
+    primaryDisabled?: boolean;
 
-        // something to stick next to the buttons, optionally
-        additive: PropTypes.element,
-    };
+    // something to stick next to the buttons, optionally
+    additive?: React.ReactNode;
 
-    static defaultProps = {
+    primaryButtonClass?: string;
+}
+
+/**
+ * Basic container for buttons in modal dialogs.
+ */
+@replaceableComponent("views.elements.DialogButtons")
+export default class DialogButtons extends React.Component<IProps> {
+    public static defaultProps: Partial<IProps> = {
         hasCancel: true,
         disabled: false,
     };
 
-    _onCancelClick = () => {
-        this.props.onCancel();
+    private onCancelClick = (event: React.MouseEvent): void => {
+        this.props.onCancel(event);
     };
 
-    render() {
+    public render(): JSX.Element {
         let primaryButtonClassName = "mx_Dialog_primary";
         if (this.props.primaryButtonClass) {
             primaryButtonClassName += " " + this.props.primaryButtonClass;
@@ -82,7 +83,7 @@ export default class DialogButtons extends React.Component {
                 // important: the default type is 'submit' and this button comes before the
                 // primary in the DOM so will get form submissions unless we make it not a submit.
                 type="button"
-                onClick={this._onCancelClick}
+                onClick={this.onCancelClick}
                 className={this.props.cancelButtonClass}
                 disabled={this.props.disabled}
             >

From 03ce568a5de18b177232f228417fc82fb738846c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Thu, 16 Sep 2021 19:33:17 +0200
Subject: [PATCH 14/20] Convert EditableText to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../{EditableText.js => EditableText.tsx}     | 143 +++++++++---------
 1 file changed, 68 insertions(+), 75 deletions(-)
 rename src/components/views/elements/{EditableText.js => EditableText.tsx} (62%)

diff --git a/src/components/views/elements/EditableText.js b/src/components/views/elements/EditableText.tsx
similarity index 62%
rename from src/components/views/elements/EditableText.js
rename to src/components/views/elements/EditableText.tsx
index 6dbc8b87713..b3ff8ee245a 100644
--- a/src/components/views/elements/EditableText.js
+++ b/src/components/views/elements/EditableText.tsx
@@ -16,33 +16,42 @@ limitations under the License.
 */
 
 import React, { createRef } from 'react';
-import PropTypes from 'prop-types';
 import { Key } from "../../../Keyboard";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
-@replaceableComponent("views.elements.EditableText")
-export default class EditableText extends React.Component {
-    static propTypes = {
-        onValueChanged: PropTypes.func,
-        initialValue: PropTypes.string,
-        label: PropTypes.string,
-        placeholder: PropTypes.string,
-        className: PropTypes.string,
-        labelClassName: PropTypes.string,
-        placeholderClassName: PropTypes.string,
-        // Overrides blurToSubmit if true
-        blurToCancel: PropTypes.bool,
-        // Will cause onValueChanged(value, true) to fire on blur
-        blurToSubmit: PropTypes.bool,
-        editable: PropTypes.bool,
-    };
+enum Phases {
+    Display = "display",
+    Edit = "edit",
+}
 
-    static Phases = {
-        Display: "display",
-        Edit: "edit",
-    };
+interface IProps {
+    onValueChanged?: (value: string, shouldSubmit: boolean) => void;
+    initialValue?: string;
+    label?: string;
+    placeholder?: string;
+    className?: string;
+    labelClassName?: string;
+    placeholderClassName?: string;
+    // Overrides blurToSubmit if true
+    blurToCancel?: boolean;
+    // Will cause onValueChanged(value, true) to fire on blur
+    blurToSubmit?: boolean;
+    editable?: boolean;
+}
 
-    static defaultProps = {
+interface IState {
+    phase: Phases;
+}
+
+@replaceableComponent("views.elements.EditableText")
+export default class EditableText extends React.Component<IProps, IState> {
+    // we track value as an JS object field rather than in React state
+    // as React doesn't play nice with contentEditable.
+    public value = '';
+    private placeholder = false;
+    private editableDiv = createRef<HTMLDivElement>();
+
+    public static defaultProps: Partial<IProps> = {
         onValueChanged() {},
         initialValue: '',
         label: '',
@@ -53,81 +62,61 @@ export default class EditableText extends React.Component {
         blurToSubmit: false,
     };
 
-    constructor(props) {
+    constructor(props: IProps) {
         super(props);
 
-        // we track value as an JS object field rather than in React state
-        // as React doesn't play nice with contentEditable.
-        this.value = '';
-        this.placeholder = false;
-
-        this._editable_div = createRef();
+        this.state = {
+            phase: Phases.Display,
+        };
     }
 
-    state = {
-        phase: EditableText.Phases.Display,
-    };
-
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    // eslint-disable-next-line camelcase
-    UNSAFE_componentWillReceiveProps(nextProps) {
+    // eslint-disable-next-line @typescript-eslint/naming-convention, camelcase
+    public UNSAFE_componentWillReceiveProps(nextProps: IProps): void {
         if (nextProps.initialValue !== this.props.initialValue) {
             this.value = nextProps.initialValue;
-            if (this._editable_div.current) {
+            if (this.editableDiv.current) {
                 this.showPlaceholder(!this.value);
             }
         }
     }
 
-    componentDidMount() {
+    public componentDidMount(): void {
         this.value = this.props.initialValue;
-        if (this._editable_div.current) {
+        if (this.editableDiv.current) {
             this.showPlaceholder(!this.value);
         }
     }
 
-    showPlaceholder = show => {
+    private showPlaceholder = (show: boolean): void => {
         if (show) {
-            this._editable_div.current.textContent = this.props.placeholder;
-            this._editable_div.current.setAttribute("class", this.props.className
+            this.editableDiv.current.textContent = this.props.placeholder;
+            this.editableDiv.current.setAttribute("class", this.props.className
                 + " " + this.props.placeholderClassName);
             this.placeholder = true;
             this.value = '';
         } else {
-            this._editable_div.current.textContent = this.value;
-            this._editable_div.current.setAttribute("class", this.props.className);
+            this.editableDiv.current.textContent = this.value;
+            this.editableDiv.current.setAttribute("class", this.props.className);
             this.placeholder = false;
         }
     };
 
-    getValue = () => this.value;
-
-    setValue = value => {
-        this.value = value;
-        this.showPlaceholder(!this.value);
-    };
-
-    edit = () => {
-        this.setState({
-            phase: EditableText.Phases.Edit,
-        });
-    };
-
-    cancelEdit = () => {
+    private cancelEdit = (): void => {
         this.setState({
-            phase: EditableText.Phases.Display,
+            phase: Phases.Display,
         });
         this.value = this.props.initialValue;
         this.showPlaceholder(!this.value);
         this.onValueChanged(false);
-        this._editable_div.current.blur();
+        this.editableDiv.current.blur();
     };
 
-    onValueChanged = shouldSubmit => {
+    private onValueChanged = (shouldSubmit: boolean): void => {
         this.props.onValueChanged(this.value, shouldSubmit);
     };
 
-    onKeyDown = ev => {
+    private onKeyDown = (ev: React.KeyboardEvent<HTMLDivElement>): void => {
         // console.log("keyDown: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);
 
         if (this.placeholder) {
@@ -142,13 +131,13 @@ export default class EditableText extends React.Component {
         // console.log("keyDown: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);
     };
 
-    onKeyUp = ev => {
+    private onKeyUp = (ev: React.KeyboardEvent<HTMLDivElement>): void => {
         // console.log("keyUp: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);
 
-        if (!ev.target.textContent) {
+        if (!(ev.target as HTMLDivElement).textContent) {
             this.showPlaceholder(true);
         } else if (!this.placeholder) {
-            this.value = ev.target.textContent;
+            this.value = (ev.target as HTMLDivElement).textContent;
         }
 
         if (ev.key === Key.ENTER) {
@@ -160,22 +149,22 @@ export default class EditableText extends React.Component {
         // console.log("keyUp: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);
     };
 
-    onClickDiv = ev => {
+    private onClickDiv = (): void => {
         if (!this.props.editable) return;
 
         this.setState({
-            phase: EditableText.Phases.Edit,
+            phase: Phases.Edit,
         });
     };
 
-    onFocus = ev => {
+    private onFocus = (ev: React.FocusEvent<HTMLDivElement>): void => {
         //ev.target.setSelectionRange(0, ev.target.textContent.length);
 
         const node = ev.target.childNodes[0];
         if (node) {
             const range = document.createRange();
             range.setStart(node, 0);
-            range.setEnd(node, node.length);
+            range.setEnd(node, ev.target.childNodes.length);
 
             const sel = window.getSelection();
             sel.removeAllRanges();
@@ -183,11 +172,15 @@ export default class EditableText extends React.Component {
         }
     };
 
-    onFinish = (ev, shouldSubmit) => {
+    private onFinish = (
+        ev: React.KeyboardEvent<HTMLDivElement> | React.FocusEvent<HTMLDivElement>,
+        shouldSubmit?: boolean,
+    ): void => {
+        // eslint-disable-next-line @typescript-eslint/no-this-alias
         const self = this;
-        const submit = (ev.key === Key.ENTER) || shouldSubmit;
+        const submit = ("key" in ev && ev.key === Key.ENTER) || shouldSubmit;
         this.setState({
-            phase: EditableText.Phases.Display,
+            phase: Phases.Display,
         }, () => {
             if (this.value !== this.props.initialValue) {
                 self.onValueChanged(submit);
@@ -195,7 +188,7 @@ export default class EditableText extends React.Component {
         });
     };
 
-    onBlur = ev => {
+    private onBlur = (ev: React.FocusEvent<HTMLDivElement>): void => {
         const sel = window.getSelection();
         sel.removeAllRanges();
 
@@ -208,11 +201,11 @@ export default class EditableText extends React.Component {
         this.showPlaceholder(!this.value);
     };
 
-    render() {
+    public render(): JSX.Element {
         const { className, editable, initialValue, label, labelClassName } = this.props;
         let editableEl;
 
-        if (!editable || (this.state.phase === EditableText.Phases.Display &&
+        if (!editable || (this.state.phase === Phases.Display &&
             (label || labelClassName) && !this.value)
         ) {
             // show the label
@@ -222,7 +215,7 @@ export default class EditableText extends React.Component {
         } else {
             // show the content editable div, but manually manage its contents as react and contentEditable don't play nice together
             editableEl = <div
-                ref={this._editable_div}
+                ref={this.editableDiv}
                 contentEditable={true}
                 className={className}
                 onKeyDown={this.onKeyDown}

From e1445f71bd9da37f3dd61ea8f895fa8ab159f64f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Thu, 16 Sep 2021 20:05:57 +0200
Subject: [PATCH 15/20] Convert AppTile to TS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 src/components/structures/LeftPanelWidget.tsx |   1 -
 .../elements/{AppTile.js => AppTile.tsx}      | 273 +++++++++---------
 .../views/right_panel/WidgetCard.tsx          |   1 -
 src/components/views/rooms/Stickerpicker.tsx  |  19 +-
 src/stores/widgets/StopGapWidget.ts           |   2 +-
 5 files changed, 149 insertions(+), 147 deletions(-)
 rename src/components/views/elements/{AppTile.js => AppTile.tsx} (73%)

diff --git a/src/components/structures/LeftPanelWidget.tsx b/src/components/structures/LeftPanelWidget.tsx
index 331e4283552..6b91acb5f80 100644
--- a/src/components/structures/LeftPanelWidget.tsx
+++ b/src/components/structures/LeftPanelWidget.tsx
@@ -76,7 +76,6 @@ const LeftPanelWidget: React.FC = () => {
             <AppTile
                 app={app}
                 fullWidth
-                show
                 showMenubar={false}
                 userWidget
                 userId={cli.getUserId()}
diff --git a/src/components/views/elements/AppTile.js b/src/components/views/elements/AppTile.tsx
similarity index 73%
rename from src/components/views/elements/AppTile.js
rename to src/components/views/elements/AppTile.tsx
index a02465d01ee..1485462ab29 100644
--- a/src/components/views/elements/AppTile.js
+++ b/src/components/views/elements/AppTile.tsx
@@ -19,7 +19,6 @@ limitations under the License.
 
 import url from 'url';
 import React, { createRef } from 'react';
-import PropTypes from 'prop-types';
 import { MatrixClientPeg } from '../../../MatrixClientPeg';
 import AccessibleButton from './AccessibleButton';
 import { _t } from '../../../languageHandler';
@@ -39,33 +38,96 @@ import { MatrixCapabilities } from "matrix-widget-api";
 import RoomWidgetContextMenu from "../context_menus/WidgetContextMenu";
 import WidgetAvatar from "../avatars/WidgetAvatar";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { Room } from "matrix-js-sdk/src/models/room";
+import { IApp } from "../../../stores/WidgetStore";
+
+interface IProps {
+    app: IApp;
+    // If room is not specified then it is an account level widget
+    // which bypasses permission prompts as it was added explicitly by that user
+    room: Room;
+    // Specifying 'fullWidth' as true will render the app tile to fill the width of the app drawer continer.
+    // This should be set to true when there is only one widget in the app drawer, otherwise it should be false.
+    fullWidth?: boolean;
+    // Optional. If set, renders a smaller view of the widget
+    miniMode?: boolean;
+    // UserId of the current user
+    userId: string;
+    // UserId of the entity that added / modified the widget
+    creatorUserId: string;
+    waitForIframeLoad: boolean;
+    showMenubar?: boolean;
+    // Optional onEditClickHandler (overrides default behaviour)
+    onEditClick?: () => void;
+    // Optional onDeleteClickHandler (overrides default behaviour)
+    onDeleteClick?: () => void;
+    // Optionally hide the tile title
+    showTitle?: boolean;
+    // Optionally handle minimise button pointer events (default false)
+    handleMinimisePointerEvents?: boolean;
+    // Optionally hide the popout widget icon
+    showPopout?: boolean;
+    // Is this an instance of a user widget
+    userWidget: boolean;
+    // sets the pointer-events property on the iframe
+    pointerEvents?: string;
+    widgetPageTitle?: string;
+}
+
+interface IState {
+    initialising: boolean; // True while we are mangling the widget URL
+    // True while the iframe content is loading
+    loading: boolean;
+    // Assume that widget has permission to load if we are the user who
+    // added it to the room, or if explicitly granted by the user
+    hasPermissionToLoad: boolean;
+    error: Error;
+    menuDisplayed: boolean;
+    widgetPageTitle: string;
+}
 
 @replaceableComponent("views.elements.AppTile")
-export default class AppTile extends React.Component {
-    constructor(props) {
+export default class AppTile extends React.Component<IProps, IState> {
+    displayName = 'AppTile';
+    public static defaultProps: Partial<IProps> = {
+        waitForIframeLoad: true,
+        showMenubar: true,
+        showTitle: true,
+        showPopout: true,
+        handleMinimisePointerEvents: false,
+        userWidget: false,
+        miniMode: false,
+    };
+
+    private contextMenuButton = createRef<any>();
+    private iframe: HTMLIFrameElement; // ref to the iframe (callback style)
+    private allowedWidgetsWatchRef: string;
+    private persistKey: string;
+    private sgWidget: StopGapWidget;
+    private dispatcherRef: string;
+
+    constructor(props: IProps) {
         super(props);
 
         // The key used for PersistedElement
-        this._persistKey = getPersistKey(this.props.app.id);
+        this.persistKey = getPersistKey(this.props.app.id);
         try {
-            this._sgWidget = new StopGapWidget(this.props);
-            this._sgWidget.on("preparing", this._onWidgetPrepared);
-            this._sgWidget.on("ready", this._onWidgetReady);
+            this.sgWidget = new StopGapWidget(this.props);
+            this.sgWidget.on("preparing", this.onWidgetPrepared);
+            this.sgWidget.on("ready", this.onWidgetReady);
         } catch (e) {
             console.log("Failed to construct widget", e);
-            this._sgWidget = null;
+            this.sgWidget = null;
         }
-        this.iframe = null; // ref to the iframe (callback style)
 
-        this.state = this._getNewState(props);
-        this._contextMenuButton = createRef();
+        this.state = this.getNewState(props);
 
-        this._allowedWidgetsWatchRef = SettingsStore.watchSetting("allowedWidgets", null, this.onAllowedWidgetsChange);
+        this.allowedWidgetsWatchRef = SettingsStore.watchSetting("allowedWidgets", null, this.onAllowedWidgetsChange);
     }
 
     // This is a function to make the impact of calling SettingsStore slightly less
-    hasPermissionToLoad = (props) => {
-        if (this._usingLocalWidget()) return true;
+    private hasPermissionToLoad = (props: IProps): boolean => {
+        if (this.usingLocalWidget()) return true;
         if (!props.room) return true; // user widgets always have permissions
 
         const currentlyAllowedWidgets = SettingsStore.getValue("allowedWidgets", props.room.roomId);
@@ -81,34 +143,34 @@ export default class AppTile extends React.Component {
      * @param  {Object} newProps The new properties of the component
      * @return {Object} Updated component state to be set with setState
      */
-    _getNewState(newProps) {
+    private getNewState(newProps: IProps): IState {
         return {
             initialising: true, // True while we are mangling the widget URL
             // True while the iframe content is loading
-            loading: this.props.waitForIframeLoad && !PersistedElement.isMounted(this._persistKey),
+            loading: this.props.waitForIframeLoad,
             // Assume that widget has permission to load if we are the user who
             // added it to the room, or if explicitly granted by the user
             hasPermissionToLoad: this.hasPermissionToLoad(newProps),
             error: null,
-            widgetPageTitle: newProps.widgetPageTitle,
             menuDisplayed: false,
+            widgetPageTitle: this.props.widgetPageTitle,
         };
     }
 
-    onAllowedWidgetsChange = () => {
+    private onAllowedWidgetsChange = (): void => {
         const hasPermissionToLoad = this.hasPermissionToLoad(this.props);
 
         if (this.state.hasPermissionToLoad && !hasPermissionToLoad) {
             // Force the widget to be non-persistent (able to be deleted/forgotten)
             ActiveWidgetStore.destroyPersistentWidget(this.props.app.id);
-            PersistedElement.destroyElement(this._persistKey);
-            if (this._sgWidget) this._sgWidget.stop();
+            PersistedElement.destroyElement(this.persistKey);
+            if (this.sgWidget) this.sgWidget.stop();
         }
 
         this.setState({ hasPermissionToLoad });
     };
 
-    isMixedContent() {
+    private isMixedContent(): boolean {
         const parentContentProtocol = window.location.protocol;
         const u = url.parse(this.props.app.url);
         const childContentProtocol = u.protocol;
@@ -120,77 +182,72 @@ export default class AppTile extends React.Component {
         return false;
     }
 
-    componentDidMount() {
+    public componentDidMount(): void {
         // Only fetch IM token on mount if we're showing and have permission to load
-        if (this._sgWidget && this.state.hasPermissionToLoad) {
-            this._startWidget();
+        if (this.sgWidget && this.state.hasPermissionToLoad) {
+            this.startWidget();
         }
 
         // Widget action listeners
-        this.dispatcherRef = dis.register(this._onAction);
+        this.dispatcherRef = dis.register(this.onAction);
     }
 
-    componentWillUnmount() {
+    public componentWillUnmount(): void {
         // Widget action listeners
         if (this.dispatcherRef) dis.unregister(this.dispatcherRef);
 
         // if it's not remaining on screen, get rid of the PersistedElement container
         if (!ActiveWidgetStore.getWidgetPersistence(this.props.app.id)) {
             ActiveWidgetStore.destroyPersistentWidget(this.props.app.id);
-            PersistedElement.destroyElement(this._persistKey);
+            PersistedElement.destroyElement(this.persistKey);
         }
 
-        if (this._sgWidget) {
-            this._sgWidget.stop();
+        if (this.sgWidget) {
+            this.sgWidget.stop();
         }
 
-        SettingsStore.unwatchSetting(this._allowedWidgetsWatchRef);
+        SettingsStore.unwatchSetting(this.allowedWidgetsWatchRef);
     }
 
-    _resetWidget(newProps) {
-        if (this._sgWidget) {
-            this._sgWidget.stop();
+    private resetWidget(newProps: IProps): void {
+        if (this.sgWidget) {
+            this.sgWidget.stop();
         }
         try {
-            this._sgWidget = new StopGapWidget(newProps);
-            this._sgWidget.on("preparing", this._onWidgetPrepared);
-            this._sgWidget.on("ready", this._onWidgetReady);
-            this._startWidget();
+            this.sgWidget = new StopGapWidget(newProps);
+            this.sgWidget.on("preparing", this.onWidgetPrepared);
+            this.sgWidget.on("ready", this.onWidgetReady);
+            this.startWidget();
         } catch (e) {
             console.log("Failed to construct widget", e);
-            this._sgWidget = null;
+            this.sgWidget = null;
         }
     }
 
-    _startWidget() {
-        this._sgWidget.prepare().then(() => {
+    private startWidget(): void {
+        this.sgWidget.prepare().then(() => {
             this.setState({ initialising: false });
         });
     }
 
-    _iframeRefChange = (ref) => {
+    private iframeRefChange = (ref: HTMLIFrameElement): void => {
         this.iframe = ref;
         if (ref) {
-            if (this._sgWidget) this._sgWidget.start(ref);
+            if (this.sgWidget) this.sgWidget.start(ref);
         } else {
-            this._resetWidget(this.props);
+            this.resetWidget(this.props);
         }
     };
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    UNSAFE_componentWillReceiveProps(nextProps) { // eslint-disable-line camelcase
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    public UNSAFE_componentWillReceiveProps(nextProps: IProps): void { // eslint-disable-line camelcase
         if (nextProps.app.url !== this.props.app.url) {
-            this._getNewState(nextProps);
+            this.getNewState(nextProps);
             if (this.state.hasPermissionToLoad) {
-                this._resetWidget(nextProps);
+                this.resetWidget(nextProps);
             }
         }
-
-        if (nextProps.widgetPageTitle !== this.props.widgetPageTitle) {
-            this.setState({
-                widgetPageTitle: nextProps.widgetPageTitle,
-            });
-        }
     }
 
     /**
@@ -198,7 +255,7 @@ export default class AppTile extends React.Component {
      * @private
      * @returns {Promise<*>} Resolves when the widget is terminated, or timeout passed.
      */
-    async _endWidgetActions() { // widget migration dev note: async to maintain signature
+    private async endWidgetActions(): Promise<void> { // widget migration dev note: async to maintain signature
         // HACK: This is a really dirty way to ensure that Jitsi cleans up
         // its hold on the webcam. Without this, the widget holds a media
         // stream open, even after death. See https://github.com/vector-im/element-web/issues/7351
@@ -217,27 +274,27 @@ export default class AppTile extends React.Component {
         }
 
         // Delete the widget from the persisted store for good measure.
-        PersistedElement.destroyElement(this._persistKey);
+        PersistedElement.destroyElement(this.persistKey);
         ActiveWidgetStore.destroyPersistentWidget(this.props.app.id);
 
-        if (this._sgWidget) this._sgWidget.stop({ forceDestroy: true });
+        if (this.sgWidget) this.sgWidget.stop({ forceDestroy: true });
     }
 
-    _onWidgetPrepared = () => {
+    private onWidgetPrepared = (): void => {
         this.setState({ loading: false });
     };
 
-    _onWidgetReady = () => {
+    private onWidgetReady = (): void => {
         if (WidgetType.JITSI.matches(this.props.app.type)) {
-            this._sgWidget.widgetApi.transport.send(ElementWidgetActions.ClientReady, {});
+            this.sgWidget.widgetApi.transport.send(ElementWidgetActions.ClientReady, {});
         }
     };
 
-    _onAction = payload => {
+    private onAction = (payload): void => {
         if (payload.widgetId === this.props.app.id) {
             switch (payload.action) {
                 case 'm.sticker':
-                    if (this._sgWidget.widgetApi.hasCapability(MatrixCapabilities.StickerSending)) {
+                    if (this.sgWidget.widgetApi.hasCapability(MatrixCapabilities.StickerSending)) {
                         dis.dispatch({ action: 'post_sticker_message', data: payload.data });
                         dis.dispatch({ action: 'stickerpicker_close' });
                     } else {
@@ -248,7 +305,7 @@ export default class AppTile extends React.Component {
         }
     };
 
-    _grantWidgetPermission = () => {
+    private grantWidgetPermission = (): void => {
         const roomId = this.props.room.roomId;
         console.info("Granting permission for widget to load: " + this.props.app.eventId);
         const current = SettingsStore.getValue("allowedWidgets", roomId);
@@ -258,14 +315,14 @@ export default class AppTile extends React.Component {
             this.setState({ hasPermissionToLoad: true });
 
             // Fetch a token for the integration manager, now that we're allowed to
-            this._startWidget();
+            this.startWidget();
         }).catch(err => {
             console.error(err);
             // We don't really need to do anything about this - the user will just hit the button again.
         });
     };
 
-    formatAppTileName() {
+    private formatAppTileName(): string {
         let appTileName = "No name";
         if (this.props.app.name && this.props.app.name.trim()) {
             appTileName = this.props.app.name.trim();
@@ -278,11 +335,11 @@ export default class AppTile extends React.Component {
      * actual widget URL
      * @returns {bool} true If using a local version of the widget
      */
-    _usingLocalWidget() {
+    private usingLocalWidget(): boolean {
         return WidgetType.JITSI.matches(this.props.app.type);
     }
 
-    _getTileTitle() {
+    private getTileTitle(): JSX.Element {
         const name = this.formatAppTileName();
         const titleSpacer = <span>&nbsp;-&nbsp;</span>;
         let title = '';
@@ -300,32 +357,32 @@ export default class AppTile extends React.Component {
     }
 
     // TODO replace with full screen interactions
-    _onPopoutWidgetClick = () => {
+    private onPopoutWidgetClick = (): void => {
         // Ensure Jitsi conferences are closed on pop-out, to not confuse the user to join them
         // twice from the same computer, which Jitsi can have problems with (audio echo/gain-loop).
         if (WidgetType.JITSI.matches(this.props.app.type)) {
-            this._endWidgetActions().then(() => {
+            this.endWidgetActions().then(() => {
                 if (this.iframe) {
                     // Reload iframe
-                    this.iframe.src = this._sgWidget.embedUrl;
+                    this.iframe.src = this.sgWidget.embedUrl;
                 }
             });
         }
         // Using Object.assign workaround as the following opens in a new window instead of a new tab.
         // window.open(this._getPopoutUrl(), '_blank', 'noopener=yes');
         Object.assign(document.createElement('a'),
-            { target: '_blank', href: this._sgWidget.popoutUrl, rel: 'noreferrer noopener' }).click();
+            { target: '_blank', href: this.sgWidget.popoutUrl, rel: 'noreferrer noopener' }).click();
     };
 
-    _onContextMenuClick = () => {
+    private onContextMenuClick = (): void => {
         this.setState({ menuDisplayed: true });
     };
 
-    _closeContextMenu = () => {
+    private closeContextMenu = (): void => {
         this.setState({ menuDisplayed: false });
     };
 
-    render() {
+    public render(): JSX.Element {
         let appTileBody;
 
         // Note that there is advice saying allow-scripts shouldn't be used with allow-same-origin
@@ -351,7 +408,7 @@ export default class AppTile extends React.Component {
                 <Spinner message={_t("Loading...")} />
             </div>
         );
-        if (this._sgWidget === null) {
+        if (this.sgWidget === null) {
             appTileBody = (
                 <div className={appTileBodyClass} style={appTileBodyStyles}>
                     <AppWarning errorMsg={_t("Error loading Widget")} />
@@ -365,9 +422,9 @@ export default class AppTile extends React.Component {
                     <AppPermission
                         roomId={this.props.room.roomId}
                         creatorUserId={this.props.creatorUserId}
-                        url={this._sgWidget.embedUrl}
+                        url={this.sgWidget.embedUrl}
                         isRoomEncrypted={isEncrypted}
-                        onPermissionGranted={this._grantWidgetPermission}
+                        onPermissionGranted={this.grantWidgetPermission}
                     />
                 </div>
             );
@@ -390,8 +447,8 @@ export default class AppTile extends React.Component {
                         { this.state.loading && loadingElement }
                         <iframe
                             allow={iframeFeatures}
-                            ref={this._iframeRefChange}
-                            src={this._sgWidget.embedUrl}
+                            ref={this.iframeRefChange}
+                            src={this.sgWidget.embedUrl}
                             allowFullScreen={true}
                             sandbox={sandboxFlags}
                         />
@@ -407,7 +464,7 @@ export default class AppTile extends React.Component {
                     // Also wrap the PersistedElement in a div to fix the height, otherwise
                     // AppTile's border is in the wrong place
                     appTileBody = <div className="mx_AppTile_persistedWrapper">
-                        <PersistedElement persistKey={this._persistKey}>
+                        <PersistedElement persistKey={this.persistKey}>
                             { appTileBody }
                         </PersistedElement>
                     </div>;
@@ -429,9 +486,9 @@ export default class AppTile extends React.Component {
         if (this.state.menuDisplayed) {
             contextMenu = (
                 <RoomWidgetContextMenu
-                    {...aboveLeftOf(this._contextMenuButton.current.getBoundingClientRect(), null)}
+                    {...aboveLeftOf(this.contextMenuButton.current.getBoundingClientRect(), null)}
                     app={this.props.app}
-                    onFinished={this._closeContextMenu}
+                    onFinished={this.closeContextMenu}
                     showUnpin={!this.props.userWidget}
                     userWidget={this.props.userWidget}
                     onEditClick={this.props.onEditClick}
@@ -444,21 +501,21 @@ export default class AppTile extends React.Component {
             <div className={appTileClasses} id={this.props.app.id}>
                 { this.props.showMenubar &&
                     <div className="mx_AppTileMenuBar">
-                        <span className="mx_AppTileMenuBarTitle" style={{ pointerEvents: (this.props.handleMinimisePointerEvents ? 'all' : false) }}>
-                            { this.props.showTitle && this._getTileTitle() }
+                        <span className="mx_AppTileMenuBarTitle" style={{ pointerEvents: (this.props.handleMinimisePointerEvents ? 'all' : "none") }}>
+                            { this.props.showTitle && this.getTileTitle() }
                         </span>
                         <span className="mx_AppTileMenuBarWidgets">
                             { this.props.showPopout && <AccessibleButton
                                 className="mx_AppTileMenuBar_iconButton mx_AppTileMenuBar_iconButton_popout"
                                 title={_t('Popout widget')}
-                                onClick={this._onPopoutWidgetClick}
+                                onClick={this.onPopoutWidgetClick}
                             /> }
                             <ContextMenuButton
                                 className="mx_AppTileMenuBar_iconButton mx_AppTileMenuBar_iconButton_menu"
                                 label={_t("Options")}
                                 isExpanded={this.state.menuDisplayed}
-                                inputRef={this._contextMenuButton}
-                                onClick={this._onContextMenuClick}
+                                inputRef={this.contextMenuButton}
+                                onClick={this.onContextMenuClick}
                             />
                         </span>
                     </div> }
@@ -469,49 +526,3 @@ export default class AppTile extends React.Component {
         </React.Fragment>;
     }
 }
-
-AppTile.displayName = 'AppTile';
-
-AppTile.propTypes = {
-    app: PropTypes.object.isRequired,
-    // If room is not specified then it is an account level widget
-    // which bypasses permission prompts as it was added explicitly by that user
-    room: PropTypes.object,
-    // Specifying 'fullWidth' as true will render the app tile to fill the width of the app drawer continer.
-    // This should be set to true when there is only one widget in the app drawer, otherwise it should be false.
-    fullWidth: PropTypes.bool,
-    // Optional. If set, renders a smaller view of the widget
-    miniMode: PropTypes.bool,
-    // UserId of the current user
-    userId: PropTypes.string.isRequired,
-    // UserId of the entity that added / modified the widget
-    creatorUserId: PropTypes.string,
-    waitForIframeLoad: PropTypes.bool,
-    showMenubar: PropTypes.bool,
-    // Optional onEditClickHandler (overrides default behaviour)
-    onEditClick: PropTypes.func,
-    // Optional onDeleteClickHandler (overrides default behaviour)
-    onDeleteClick: PropTypes.func,
-    // Optional onMinimiseClickHandler
-    onMinimiseClick: PropTypes.func,
-    // Optionally hide the tile title
-    showTitle: PropTypes.bool,
-    // Optionally handle minimise button pointer events (default false)
-    handleMinimisePointerEvents: PropTypes.bool,
-    // Optionally hide the popout widget icon
-    showPopout: PropTypes.bool,
-    // Is this an instance of a user widget
-    userWidget: PropTypes.bool,
-    // sets the pointer-events property on the iframe
-    pointerEvents: PropTypes.string,
-};
-
-AppTile.defaultProps = {
-    waitForIframeLoad: true,
-    showMenubar: true,
-    showTitle: true,
-    showPopout: true,
-    handleMinimisePointerEvents: false,
-    userWidget: false,
-    miniMode: false,
-};
diff --git a/src/components/views/right_panel/WidgetCard.tsx b/src/components/views/right_panel/WidgetCard.tsx
index d7493e05126..8ab73483df3 100644
--- a/src/components/views/right_panel/WidgetCard.tsx
+++ b/src/components/views/right_panel/WidgetCard.tsx
@@ -97,7 +97,6 @@ const WidgetCard: React.FC<IProps> = ({ room, widgetId, onClose }) => {
         <AppTile
             app={app}
             fullWidth
-            show
             showMenubar={false}
             room={room}
             userId={cli.getUserId()}
diff --git a/src/components/views/rooms/Stickerpicker.tsx b/src/components/views/rooms/Stickerpicker.tsx
index 0806b4ab9dc..2b898e0f346 100644
--- a/src/components/views/rooms/Stickerpicker.tsx
+++ b/src/components/views/rooms/Stickerpicker.tsx
@@ -32,6 +32,7 @@ import { replaceableComponent } from "../../../utils/replaceableComponent";
 import { ActionPayload } from '../../../dispatcher/payloads';
 import ScalarAuthClient from '../../../ScalarAuthClient';
 import GenericElementContextMenu from "../context_menus/GenericElementContextMenu";
+import { IApp } from "../../../stores/WidgetStore";
 
 // This should be below the dialog level (4000), but above the rest of the UI (1000-2000).
 // We sit in a context menu, so this should be given to the context menu.
@@ -256,12 +257,16 @@ export default class Stickerpicker extends React.PureComponent<IProps, IState> {
             stickerpickerWidget.content.name = stickerpickerWidget.content.name || _t("Stickerpack");
 
             // FIXME: could this use the same code as other apps?
-            const stickerApp = {
+            const stickerApp: IApp = {
                 id: stickerpickerWidget.id,
                 url: stickerpickerWidget.content.url,
                 name: stickerpickerWidget.content.name,
                 type: stickerpickerWidget.content.type,
                 data: stickerpickerWidget.content.data,
+                roomId: stickerpickerWidget.content.roomId,
+                eventId: stickerpickerWidget.content.eventId,
+                avatar_url: stickerpickerWidget.content.avatar_url,
+                creatorUserId: stickerpickerWidget.content.creatorUserId,
             };
 
             stickersContent = (
@@ -287,9 +292,7 @@ export default class Stickerpicker extends React.PureComponent<IProps, IState> {
                                 onEditClick={this.launchManageIntegrations}
                                 onDeleteClick={this.removeStickerpickerWidgets}
                                 showTitle={false}
-                                showCancel={false}
                                 showPopout={false}
-                                onMinimiseClick={this.onHideStickersClick}
                                 handleMinimisePointerEvents={true}
                                 userWidget={true}
                             />
@@ -345,16 +348,6 @@ export default class Stickerpicker extends React.PureComponent<IProps, IState> {
         });
     };
 
-    /**
-     * Trigger hiding of the sticker picker overlay
-     * @param  {Event} ev Event that triggered the function call
-     */
-    private onHideStickersClick = (ev: React.MouseEvent): void => {
-        if (this.props.showStickers) {
-            this.props.setShowStickers(false);
-        }
-    };
-
     /**
      * Called when the window is resized
      */
diff --git a/src/stores/widgets/StopGapWidget.ts b/src/stores/widgets/StopGapWidget.ts
index 750034c573d..c0a98185c79 100644
--- a/src/stores/widgets/StopGapWidget.ts
+++ b/src/stores/widgets/StopGapWidget.ts
@@ -67,7 +67,7 @@ interface IAppTileProps {
     userId: string;
     creatorUserId: string;
     waitForIframeLoad: boolean;
-    whitelistCapabilities: string[];
+    whitelistCapabilities?: string[];
     userWidget: boolean;
 }
 

From 0df67d005e4d1be5b5a276304de1a4d028ae3355 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Mon, 20 Sep 2021 17:11:14 +0200
Subject: [PATCH 16/20] Ditch displayName
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 src/components/views/elements/AppTile.tsx | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/components/views/elements/AppTile.tsx b/src/components/views/elements/AppTile.tsx
index 1485462ab29..4ce85b01144 100644
--- a/src/components/views/elements/AppTile.tsx
+++ b/src/components/views/elements/AppTile.tsx
@@ -88,7 +88,6 @@ interface IState {
 
 @replaceableComponent("views.elements.AppTile")
 export default class AppTile extends React.Component<IProps, IState> {
-    displayName = 'AppTile';
     public static defaultProps: Partial<IProps> = {
         waitForIframeLoad: true,
         showMenubar: true,

From 459e0281370a9e164a97db3efee9122b46802262 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Mon, 20 Sep 2021 17:15:36 +0200
Subject: [PATCH 17/20] Fix some regressions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 src/components/views/elements/AppTile.tsx          | 8 +++++++-
 src/components/views/elements/PersistedElement.tsx | 4 ++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/components/views/elements/AppTile.tsx b/src/components/views/elements/AppTile.tsx
index 4ce85b01144..9ab7a917886 100644
--- a/src/components/views/elements/AppTile.tsx
+++ b/src/components/views/elements/AppTile.tsx
@@ -146,7 +146,7 @@ export default class AppTile extends React.Component<IProps, IState> {
         return {
             initialising: true, // True while we are mangling the widget URL
             // True while the iframe content is loading
-            loading: this.props.waitForIframeLoad,
+            loading: this.props.waitForIframeLoad && !PersistedElement.isMounted(this.persistKey),
             // Assume that widget has permission to load if we are the user who
             // added it to the room, or if explicitly granted by the user
             hasPermissionToLoad: this.hasPermissionToLoad(newProps),
@@ -247,6 +247,12 @@ export default class AppTile extends React.Component<IProps, IState> {
                 this.resetWidget(nextProps);
             }
         }
+
+        if (nextProps.widgetPageTitle !== this.props.widgetPageTitle) {
+            this.setState({
+                widgetPageTitle: nextProps.widgetPageTitle,
+            });
+        }
     }
 
     /**
diff --git a/src/components/views/elements/PersistedElement.tsx b/src/components/views/elements/PersistedElement.tsx
index 8dda530097c..d0130918033 100644
--- a/src/components/views/elements/PersistedElement.tsx
+++ b/src/components/views/elements/PersistedElement.tsx
@@ -104,6 +104,10 @@ export default class PersistedElement extends React.Component<IProps> {
         }
     }
 
+    static isMounted(persistKey) {
+        return Boolean(getContainer('mx_persistedElement_' + persistKey));
+    }
+
     private collectChildContainer = (ref: HTMLDivElement): void => {
         if (this.childContainer) {
             this.resizeObserver.unobserve(this.childContainer);

From 26ae71f0939b4ed7fc790e72840f8cd09a759e5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Mon, 20 Sep 2021 17:16:01 +0200
Subject: [PATCH 18/20] Lose underscore
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 .../views/elements/EditableTextContainer.tsx         | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/components/views/elements/EditableTextContainer.tsx b/src/components/views/elements/EditableTextContainer.tsx
index 9610b188fbb..b4689b90db2 100644
--- a/src/components/views/elements/EditableTextContainer.tsx
+++ b/src/components/views/elements/EditableTextContainer.tsx
@@ -57,7 +57,7 @@ interface IState {
  */
 @replaceableComponent("views.elements.EditableTextContainer")
 export default class EditableTextContainer extends React.Component<IProps, IState> {
-    private _unmounted = false;
+    private unmounted = false;
     public static defaultProps: Partial<IProps> = {
         initialValue: "",
         placeholder: "",
@@ -82,13 +82,13 @@ export default class EditableTextContainer extends React.Component<IProps, IStat
         this.setState({ busy: true });
         try {
             const initialValue = await this.props.getInitialValue();
-            if (this._unmounted) return;
+            if (this.unmounted) return;
             this.setState({
                 busy: false,
                 value: initialValue,
             });
         } catch (error) {
-            if (this._unmounted) return;
+            if (this.unmounted) return;
             this.setState({
                 errorString: error.toString(),
                 busy: false,
@@ -97,7 +97,7 @@ export default class EditableTextContainer extends React.Component<IProps, IStat
     }
 
     public componentWillUnmount(): void {
-        this._unmounted = true;
+        this.unmounted = true;
     }
 
     private onValueChanged = (value: string, shouldSubmit: boolean): void => {
@@ -112,14 +112,14 @@ export default class EditableTextContainer extends React.Component<IProps, IStat
 
         this.props.onSubmit(value).then(
             () => {
-                if (this._unmounted) { return; }
+                if (this.unmounted) { return; }
                 this.setState({
                     busy: false,
                     value: value,
                 });
             },
             (error) => {
-                if (this._unmounted) { return; }
+                if (this.unmounted) { return; }
                 this.setState({
                     errorString: error.toString(),
                     busy: false,

From ec4f672a13309cec0ba1100778cd28ea750be19e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Mon, 20 Sep 2021 17:19:03 +0200
Subject: [PATCH 19/20] Improve typing
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 src/components/views/elements/LazyRenderList.tsx | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/components/views/elements/LazyRenderList.tsx b/src/components/views/elements/LazyRenderList.tsx
index 65d578b56fa..54c76f27a7c 100644
--- a/src/components/views/elements/LazyRenderList.tsx
+++ b/src/components/views/elements/LazyRenderList.tsx
@@ -55,7 +55,7 @@ class ItemRange {
     }
 }
 
-interface IProps<T extends unknown> {
+interface IProps<T> {
     // height in pixels of the component returned by `renderItem`
     itemHeight: number;
     // function to turn an element of `items` into a react component
@@ -84,13 +84,13 @@ interface IState {
 }
 
 @replaceableComponent("views.elements.LazyRenderList")
-export default class LazyRenderList extends React.Component<IProps<unknown>, IState> {
+export default class LazyRenderList<T = any> extends React.Component<IProps<T>, IState> {
     public static defaultProps: Partial<IProps<unknown>> = {
         overflowItems: 20,
         overflowMargin: 5,
     };
 
-    constructor(props: IProps<unknown>) {
+    constructor(props: IProps<T>) {
         super(props);
 
         this.state = {

From 24df63abd709270ac467ca42ed8d0286c4e2f21f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Tue, 21 Sep 2021 08:48:25 +0200
Subject: [PATCH 20/20] Improve typing
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 src/components/views/elements/PowerSelector.tsx          | 9 +++++----
 src/components/views/right_panel/UserInfo.tsx            | 3 +--
 .../views/settings/tabs/room/RolesRoomSettingsTab.tsx    | 6 ++----
 3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/src/components/views/elements/PowerSelector.tsx b/src/components/views/elements/PowerSelector.tsx
index f6e24f2bbb4..a99812028ec 100644
--- a/src/components/views/elements/PowerSelector.tsx
+++ b/src/components/views/elements/PowerSelector.tsx
@@ -33,7 +33,7 @@ interface IProps {
 
     // should the user be able to change the value? false by default.
     disabled?: boolean;
-    onChange?: (value: string, powerLevelKey: string) => void;
+    onChange?: (value: number, powerLevelKey: string) => void;
 
     // Optional key to pass as the second argument to `onChange`
     powerLevelKey?: string;
@@ -111,8 +111,9 @@ export default class PowerSelector extends React.Component<IProps, IState> {
         if (isCustom) {
             this.setState({ custom: true });
         } else {
-            this.props.onChange(event.target.value, this.props.powerLevelKey);
-            this.setState({ selectValue: parseInt(event.target.value) });
+            const powerLevel = parseInt(event.target.value);
+            this.props.onChange(powerLevel, this.props.powerLevelKey);
+            this.setState({ selectValue: powerLevel });
         }
     };
 
@@ -124,7 +125,7 @@ export default class PowerSelector extends React.Component<IProps, IState> {
         event.preventDefault();
         event.stopPropagation();
 
-        this.props.onChange(String(this.state.customValue), this.props.powerLevelKey);
+        this.props.onChange(this.state.customValue, this.props.powerLevelKey);
     };
 
     private onCustomKeyDown = (event: React.KeyboardEvent<HTMLInputElement>): void => {
diff --git a/src/components/views/right_panel/UserInfo.tsx b/src/components/views/right_panel/UserInfo.tsx
index f1807985ae5..3790fc3701d 100644
--- a/src/components/views/right_panel/UserInfo.tsx
+++ b/src/components/views/right_panel/UserInfo.tsx
@@ -1052,8 +1052,7 @@ const PowerLevelEditor: React.FC<{
     const cli = useContext(MatrixClientContext);
 
     const [selectedPowerLevel, setSelectedPowerLevel] = useState(user.powerLevel);
-    const onPowerChange = useCallback(async (powerLevelStr: string) => {
-        const powerLevel = parseInt(powerLevelStr, 10);
+    const onPowerChange = useCallback(async (powerLevel: number) => {
         setSelectedPowerLevel(powerLevel);
 
         const applyPowerChange = (roomId, target, powerLevel, powerLevelEvent) => {
diff --git a/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx b/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx
index d27910517d5..f1179d38e55 100644
--- a/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx
+++ b/src/components/views/settings/tabs/room/RolesRoomSettingsTab.tsx
@@ -137,7 +137,7 @@ export default class RolesRoomSettingsTab extends React.Component<IProps> {
         }
     }
 
-    private onPowerLevelsChanged = (inputValue: string, powerLevelKey: string) => {
+    private onPowerLevelsChanged = (value: number, powerLevelKey: string) => {
         const client = MatrixClientPeg.get();
         const room = client.getRoom(this.props.roomId);
         const plEvent = room.currentState.getStateEvents(EventType.RoomPowerLevels, '');
@@ -148,8 +148,6 @@ export default class RolesRoomSettingsTab extends React.Component<IProps> {
 
         const eventsLevelPrefix = "event_levels_";
 
-        const value = parseInt(inputValue);
-
         if (powerLevelKey.startsWith(eventsLevelPrefix)) {
             // deep copy "events" object, Object.assign itself won't deep copy
             plContent["events"] = Object.assign({}, plContent["events"] || {});
@@ -181,7 +179,7 @@ export default class RolesRoomSettingsTab extends React.Component<IProps> {
         });
     };
 
-    private onUserPowerLevelChanged = (value: string, powerLevelKey: string) => {
+    private onUserPowerLevelChanged = (value: number, powerLevelKey: string) => {
         const client = MatrixClientPeg.get();
         const room = client.getRoom(this.props.roomId);
         const plEvent = room.currentState.getStateEvents(EventType.RoomPowerLevels, '');