From 53e7100033a9c9283f79bb3a4c5070a461709631 Mon Sep 17 00:00:00 2001
From: Michael Telatynski <7t3chguy@gmail.com>
Date: Fri, 25 Jun 2021 14:35:58 +0100
Subject: [PATCH] Initial Typescripting for Element Desktop

---
 .gitignore                                    |   1 +
 package.json                                  |  13 +-
 src/@types/global.d.ts                        |  26 +++
 src/{electron-main.js => electron-main.ts}    |  47 ++--
 ...{language-helper.js => language-helper.ts} |  51 ++--
 src/protocol.js                               | 102 --------
 src/protocol.ts                               | 103 ++++++++
 src/{squirrelhooks.js => squirrelhooks.ts}    |  14 +-
 src/{tray.js => tray.ts}                      |  37 +--
 src/{updater.js => updater.ts}                |  22 +-
 src/{vectormenu.js => vectormenu.ts}          |  37 ++-
 ...ents-handler.js => webcontents-handler.ts} |  83 ++++---
 tsconfig.json                                 |  25 ++
 yarn.lock                                     | 220 +++++++++++++++++-
 14 files changed, 543 insertions(+), 238 deletions(-)
 create mode 100644 src/@types/global.d.ts
 rename src/{electron-main.js => electron-main.ts} (97%)
 rename src/{language-helper.js => language-helper.ts} (76%)
 delete mode 100644 src/protocol.js
 create mode 100644 src/protocol.ts
 rename src/{squirrelhooks.js => squirrelhooks.ts} (93%)
 rename src/{tray.js => tray.ts} (86%)
 rename src/{updater.js => updater.ts} (92%)
 rename src/{vectormenu.js => vectormenu.ts} (89%)
 rename src/{webcontents-handler.js => webcontents-handler.ts} (75%)
 create mode 100644 tsconfig.json

diff --git a/.gitignore b/.gitignore
index a049439..8abadc3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /dist
+/lib
 /webapp
 /webapp.asar
 /packages
diff --git a/package.json b/package.json
index 063c64f..94a2a80 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "element-desktop",
   "productName": "Element",
-  "main": "src/electron-main.js",
+  "main": "lib/electron-main.js",
   "version": "1.7.31",
   "description": "A feature-rich client for Matrix.org",
   "author": "Element",
@@ -18,12 +18,13 @@
     "mkdirs": "mkdirp packages deploys",
     "fetch": "yarn run mkdirs && node scripts/fetch-package.js",
     "asar-webapp": "asar p webapp webapp.asar",
-    "start": "electron .",
+    "start": "yarn run tsbuild && electron .",
     "lint": "eslint src/ scripts/ hak/",
     "build:native": "yarn run hak",
     "build32": "electron-builder --ia32",
     "build64": "electron-builder --x64",
-    "build": "electron-builder",
+    "build": "yarn run tsbuild && electron-builder",
+    "tsbuild": "tsc",
     "docker:setup": "docker build -t element-desktop-dockerbuild dockerbuild",
     "docker:build:native": "scripts/in-docker.sh yarn run hak",
     "docker:build": "scripts/in-docker.sh yarn run build",
@@ -42,7 +43,10 @@
     "request": "^2.88.2"
   },
   "devDependencies": {
+    "@types/auto-launch": "^5.0.1",
+    "@types/counterpart": "^0.18.1",
     "asar": "^2.0.1",
+    "electron": "12.0.11",
     "electron-builder": "22.11.4",
     "electron-builder-squirrel-windows": "22.11.4",
     "electron-devtools-installer": "^3.1.1",
@@ -60,7 +64,8 @@
     "npm": "^6.14.11",
     "rimraf": "^3.0.2",
     "semver": "^7.3.4",
-    "tar": "^6.1.0"
+    "tar": "^6.1.0",
+    "typescript": "^4.1.3"
   },
   "hakDependencies": {
     "matrix-seshat": "^2.2.3",
diff --git a/src/@types/global.d.ts b/src/@types/global.d.ts
new file mode 100644
index 0000000..cc74a3a
--- /dev/null
+++ b/src/@types/global.d.ts
@@ -0,0 +1,26 @@
+/*
+Copyright 2021 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { BrowserWindow } from "electron";
+
+declare global {
+    namespace NodeJS {
+        interface Global {
+            mainWindow: BrowserWindow;
+            appQuitting: boolean;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/electron-main.js b/src/electron-main.ts
similarity index 97%
rename from src/electron-main.js
rename to src/electron-main.ts
index 049ab15..40997ed 100644
--- a/src/electron-main.js
+++ b/src/electron-main.ts
@@ -20,32 +20,29 @@ limitations under the License.
 // Squirrel on windows starts the app with various flags
 // as hooks to tell us when we've been installed/uninstalled
 // etc.
-const checkSquirrelHooks = require('./squirrelhooks');
-if (checkSquirrelHooks()) return;
+import { checkSquirrelHooks } from "./squirrelhooks";
+if (checkSquirrelHooks()) process.exit(1);
 
 const argv = require('minimist')(process.argv, {
     alias: { help: "h" },
 });
 
-const {
-    app, ipcMain, powerSaveBlocker, BrowserWindow, Menu, autoUpdater, protocol, dialog,
-} = require('electron');
-const AutoLaunch = require('auto-launch');
-const path = require('path');
+import { app, ipcMain, powerSaveBlocker, BrowserWindow, Menu, autoUpdater, protocol, dialog } from "electron";
+import AutoLaunch from "auto-launch";
+import path from "path";
+import windowStateKeeper from 'electron-window-state';
+import Store from 'electron-store';
+import fs, { promises as afs } from "fs";
+import crypto from "crypto";
+import { URL } from "url";
 
-const tray = require('./tray');
-const buildMenuTemplate = require('./vectormenu');
-const webContentsHandler = require('./webcontents-handler');
-const updater = require('./updater');
-const { getProfileFromDeeplink, protocolInit, recordSSOSession } = require('./protocol');
+import * as tray from "./tray";
+import { buildMenuTemplate } from './vectormenu';
+import webContentsHandler from './webcontents-handler';
+import * as updater from './updater';
+import { getProfileFromDeeplink, protocolInit, recordSSOSession } from './protocol';
+import { _t, AppLocalization } from './language-helper';
 
-const windowStateKeeper = require('electron-window-state');
-const Store = require('electron-store');
-
-const fs = require('fs');
-const afs = fs.promises;
-
-const crypto = require('crypto');
 let keytar;
 try {
     keytar = require('keytar');
@@ -57,8 +54,6 @@ try {
     }
 }
 
-const { _t, AppLocalization } = require('./language-helper');
-
 let seshatSupported = false;
 let Seshat;
 let SeshatRecovery;
@@ -259,7 +254,13 @@ async function moveAutoLauncher() {
 }
 
 const eventStorePath = path.join(app.getPath('userData'), 'EventStore');
-const store = new Store({ name: "electron-config" });
+const store = new Store<{
+    warnBeforeExit?: boolean;
+    minimizeToTray?: boolean;
+    spellCheckerEnabled?: boolean;
+    autoHideMenuBar?: boolean;
+    locale?: string | string[];
+}>({ name: "electron-config" });
 
 let eventIndex = null;
 
@@ -1016,7 +1017,7 @@ function beforeQuit() {
 }
 
 app.on('before-quit', beforeQuit);
-app.on('before-quit-for-update', beforeQuit);
+autoUpdater.on('before-quit-for-update', beforeQuit);
 
 app.on('second-instance', (ev, commandLine, workingDirectory) => {
     // If other instance launched with --hidden then skip showing window
diff --git a/src/language-helper.js b/src/language-helper.ts
similarity index 76%
rename from src/language-helper.js
rename to src/language-helper.ts
index 0a41f69..b4dcb70 100644
--- a/src/language-helper.js
+++ b/src/language-helper.ts
@@ -14,15 +14,23 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-const counterpart = require('counterpart');
+import counterpart from "counterpart";
+import type Store from 'electron-store';
 
 const DEFAULT_LOCALE = "en";
 
-function _td(text) {
+export function _td(text: string): string {
     return text;
 }
 
-function _t(text, variables = {}) {
+type SubstitutionValue = number | string;
+
+interface IVariables {
+    [key: string]: SubstitutionValue;
+    count?: number;
+}
+
+export function _t(text: string, variables: IVariables = {}): string {
     const args = Object.assign({ interpolate: false }, variables);
 
     const { count } = args;
@@ -55,11 +63,17 @@ function _t(text, variables = {}) {
     return translated;
 }
 
-class AppLocalization {
-    constructor({ store, components = [] }) {
-        // TODO: Should be static field, but that doesn't parse without Babel
-        this.STORE_KEY = "locale";
+type Component = () => void;
 
+type TypedStore = Store<{ locale?: string | string[] }>;
+
+export class AppLocalization {
+    private static readonly STORE_KEY = "locale";
+
+    private readonly store: TypedStore;
+    private readonly localizedComponents: Set<Component>;
+
+    constructor({ store, components = [] }: { store: TypedStore, components: Component[] }) {
         counterpart.registerTranslations("en", this.fetchTranslationJson("en_EN"));
         counterpart.setFallbackLocale('en');
         counterpart.setSeparator('|');
@@ -69,15 +83,15 @@ class AppLocalization {
         }
 
         this.store = store;
-        if (this.store.has(this.STORE_KEY)) {
-            const locales = this.store.get(this.STORE_KEY);
+        if (this.store.has(AppLocalization.STORE_KEY)) {
+            const locales = this.store.get(AppLocalization.STORE_KEY);
             this.setAppLocale(locales);
         }
 
         this.resetLocalizedUI();
     }
 
-    fetchTranslationJson(locale) {
+    public fetchTranslationJson(locale: string): Record<string, string> {
         try {
             console.log("Fetching translation json for locale: " + locale);
             return require(`./i18n/strings/${locale}.json`);
@@ -87,11 +101,7 @@ class AppLocalization {
         }
     }
 
-    get languageTranslationJson() {
-        return this.translationJsonMap.get(this.language);
-    }
-
-    setAppLocale(locales) {
+    public setAppLocale(locales: string | string[]): void {
         console.log(`Changing application language to ${locales}`);
 
         if (!Array.isArray(locales)) {
@@ -105,13 +115,14 @@ class AppLocalization {
             }
         });
 
+        // @ts-ignore - this looks like a bug but is out of scope for this conversion
         counterpart.setLocale(locales);
-        this.store.set(this.STORE_KEY, locales);
+        this.store.set(AppLocalization.STORE_KEY, locales);
 
         this.resetLocalizedUI();
     }
 
-    resetLocalizedUI() {
+    public resetLocalizedUI(): void {
         console.log("Resetting the UI components after locale change");
         this.localizedComponents.forEach(componentSetup => {
             if (typeof componentSetup === "function") {
@@ -120,9 +131,3 @@ class AppLocalization {
         });
     }
 }
-
-module.exports = {
-    AppLocalization,
-    _t,
-    _td,
-};
diff --git a/src/protocol.js b/src/protocol.js
deleted file mode 100644
index 69f3df5..0000000
--- a/src/protocol.js
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
-Copyright 2020 The Matrix.org Foundation C.I.C.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-const { app } = require("electron");
-const path = require("path");
-const fs = require("fs");
-
-const PROTOCOL = "element://";
-const SEARCH_PARAM = "element-desktop-ssoid";
-const STORE_FILE_NAME = "sso-sessions.json";
-
-// we getPath userData before electron-main changes it, so this is the default value
-const storePath = path.join(app.getPath("userData"), STORE_FILE_NAME);
-
-const processUrl = (url) => {
-    if (!global.mainWindow) return;
-    console.log("Handling link: ", url);
-    global.mainWindow.loadURL(url.replace(PROTOCOL, "vector://"));
-};
-
-const readStore = () => {
-    try {
-        const s = fs.readFileSync(storePath, { encoding: "utf8" });
-        const o = JSON.parse(s);
-        return typeof o === "object" ? o : {};
-    } catch (e) {
-        return {};
-    }
-};
-
-const writeStore = (data) => {
-    fs.writeFileSync(storePath, JSON.stringify(data));
-};
-
-module.exports = {
-    recordSSOSession: (sessionID) => {
-        const userDataPath = app.getPath('userData');
-        const store = readStore();
-        for (const key in store) {
-            // ensure each instance only has one (the latest) session ID to prevent the file growing unbounded
-            if (store[key] === userDataPath) {
-                delete store[key];
-                break;
-            }
-        }
-        store[sessionID] = userDataPath;
-        writeStore(store);
-    },
-    getProfileFromDeeplink: (args) => {
-        // check if we are passed a profile in the SSO callback url
-        const deeplinkUrl = args.find(arg => arg.startsWith('element://'));
-        if (deeplinkUrl && deeplinkUrl.includes(SEARCH_PARAM)) {
-            const parsedUrl = new URL(deeplinkUrl);
-            if (parsedUrl.protocol === 'element:') {
-                const ssoID = parsedUrl.searchParams.get(SEARCH_PARAM);
-                const store = readStore();
-                console.log("Forwarding to profile: ", store[ssoID]);
-                return store[ssoID];
-            }
-        }
-    },
-    protocolInit: () => {
-        // get all args except `hidden` as it'd mean the app would not get focused
-        // XXX: passing args to protocol handlers only works on Windows, so unpackaged deep-linking
-        // --profile/--profile-dir are passed via the SEARCH_PARAM var in the callback url
-        const args = process.argv.slice(1).filter(arg => arg !== "--hidden" && arg !== "-hidden");
-        if (app.isPackaged) {
-            app.setAsDefaultProtocolClient('element', process.execPath, args);
-        } else if (process.platform === 'win32') { // on Mac/Linux this would just cause the electron binary to open
-            // special handler for running without being packaged, e.g `electron .` by passing our app path to electron
-            app.setAsDefaultProtocolClient('element', process.execPath, [app.getAppPath(), ...args]);
-        }
-
-        if (process.platform === 'darwin') {
-            // Protocol handler for macos
-            app.on('open-url', function(ev, url) {
-                ev.preventDefault();
-                processUrl(url);
-            });
-        } else {
-            // Protocol handler for win32/Linux
-            app.on('second-instance', (ev, commandLine) => {
-                const url = commandLine[commandLine.length - 1];
-                if (!url.startsWith(PROTOCOL)) return;
-                processUrl(url);
-            });
-        }
-    },
-};
diff --git a/src/protocol.ts b/src/protocol.ts
new file mode 100644
index 0000000..5ffbc40
--- /dev/null
+++ b/src/protocol.ts
@@ -0,0 +1,103 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { app } from "electron";
+import { URL } from "url";
+import path from "path";
+import fs from "fs";
+
+const PROTOCOL = "element://";
+const SEARCH_PARAM = "element-desktop-ssoid";
+const STORE_FILE_NAME = "sso-sessions.json";
+
+// we getPath userData before electron-main changes it, so this is the default value
+const storePath = path.join(app.getPath("userData"), STORE_FILE_NAME);
+
+function processUrl(url: string): void {
+    if (!global.mainWindow) return;
+    console.log("Handling link: ", url);
+    global.mainWindow.loadURL(url.replace(PROTOCOL, "vector://"));
+}
+
+function readStore(): object {
+    try {
+        const s = fs.readFileSync(storePath, { encoding: "utf8" });
+        const o = JSON.parse(s);
+        return typeof o === "object" ? o : {};
+    } catch (e) {
+        return {};
+    }
+}
+
+function writeStore(data: object): void {
+    fs.writeFileSync(storePath, JSON.stringify(data));
+}
+
+export function recordSSOSession(sessionID: string): void {
+    const userDataPath = app.getPath('userData');
+    const store = readStore();
+    for (const key in store) {
+        // ensure each instance only has one (the latest) session ID to prevent the file growing unbounded
+        if (store[key] === userDataPath) {
+            delete store[key];
+            break;
+        }
+    }
+    store[sessionID] = userDataPath;
+    writeStore(store);
+}
+
+export function getProfileFromDeeplink(args): string | undefined {
+    // check if we are passed a profile in the SSO callback url
+    const deeplinkUrl = args.find(arg => arg.startsWith('element://'));
+    if (deeplinkUrl && deeplinkUrl.includes(SEARCH_PARAM)) {
+        const parsedUrl = new URL(deeplinkUrl);
+        if (parsedUrl.protocol === 'element:') {
+            const ssoID = parsedUrl.searchParams.get(SEARCH_PARAM);
+            const store = readStore();
+            console.log("Forwarding to profile: ", store[ssoID]);
+            return store[ssoID];
+        }
+    }
+}
+
+export function protocolInit(): void {
+    // get all args except `hidden` as it'd mean the app would not get focused
+    // XXX: passing args to protocol handlers only works on Windows, so unpackaged deep-linking
+    // --profile/--profile-dir are passed via the SEARCH_PARAM var in the callback url
+    const args = process.argv.slice(1).filter(arg => arg !== "--hidden" && arg !== "-hidden");
+    if (app.isPackaged) {
+        app.setAsDefaultProtocolClient('element', process.execPath, args);
+    } else if (process.platform === 'win32') { // on Mac/Linux this would just cause the electron binary to open
+        // special handler for running without being packaged, e.g `electron .` by passing our app path to electron
+        app.setAsDefaultProtocolClient('element', process.execPath, [app.getAppPath(), ...args]);
+    }
+
+    if (process.platform === 'darwin') {
+        // Protocol handler for macos
+        app.on('open-url', function(ev, url) {
+            ev.preventDefault();
+            processUrl(url);
+        });
+    } else {
+        // Protocol handler for win32/Linux
+        app.on('second-instance', (ev, commandLine) => {
+            const url = commandLine[commandLine.length - 1];
+            if (!url.startsWith(PROTOCOL)) return;
+            processUrl(url);
+        });
+    }
+}
diff --git a/src/squirrelhooks.js b/src/squirrelhooks.ts
similarity index 93%
rename from src/squirrelhooks.js
rename to src/squirrelhooks.ts
index 4eeb1c8..9863312 100644
--- a/src/squirrelhooks.js
+++ b/src/squirrelhooks.ts
@@ -14,12 +14,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-const path = require('path');
-const spawn = require('child_process').spawn;
-const { app } = require('electron');
-const fsProm = require('fs').promises;
+import path from "path";
+import { spawn } from "child_process";
+import { app } from "electron";
+import { promises as fsProm } from "fs";
 
-function runUpdateExe(args) {
+function runUpdateExe(args: string[]): Promise<void> {
     // Invokes Squirrel's Update.exe which will do things for us like create shortcuts
     // Note that there's an Update.exe in the app-x.x.x directory and one in the parent
     // directory: we need to run the one in the parent directory, because it discovers
@@ -33,7 +33,7 @@ function runUpdateExe(args) {
     });
 }
 
-function checkSquirrelHooks() {
+export function checkSquirrelHooks(): boolean {
     if (process.platform !== 'win32') return false;
 
     const cmd = process.argv[1];
@@ -82,5 +82,3 @@ function checkSquirrelHooks() {
     }
     return false;
 }
-
-module.exports = checkSquirrelHooks;
diff --git a/src/tray.js b/src/tray.ts
similarity index 86%
rename from src/tray.js
rename to src/tray.ts
index 34ae072..f3c49f7 100644
--- a/src/tray.js
+++ b/src/tray.ts
@@ -15,26 +15,26 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-const { app, Tray, Menu, nativeImage } = require('electron');
-const pngToIco = require('png-to-ico');
-const path = require('path');
-const fs = require('fs');
-const { _t } = require('./language-helper');
+import { app, Tray, Menu, nativeImage } from "electron";
+import pngToIco from "png-to-ico";
+import path from "path";
+import fs from "fs";
+import { _t } from "./language-helper";
 
-let trayIcon = null;
+let trayIcon: Tray = null;
 
-exports.hasTray = function hasTray() {
+export function hasTray(): boolean {
     return (trayIcon !== null);
-};
+}
 
-exports.destroy = function() {
+export function destroy(): void {
     if (trayIcon) {
         trayIcon.destroy();
         trayIcon = null;
     }
-};
+}
 
-const toggleWin = function() {
+function toggleWin(): void {
     if (global.mainWindow.isVisible() && !global.mainWindow.isMinimized()) {
         global.mainWindow.hide();
     } else {
@@ -42,9 +42,14 @@ const toggleWin = function() {
         if (!global.mainWindow.isVisible()) global.mainWindow.show();
         global.mainWindow.focus();
     }
-};
+}
 
-exports.create = function(config) {
+interface IConfig {
+    icon_path: string;
+    brand: string;
+}
+
+export function create(config: IConfig): void {
     // no trays on darwin
     if (process.platform === 'darwin' || trayIcon) return;
     const defaultIcon = nativeImage.createFromPath(config.icon_path);
@@ -89,9 +94,9 @@ exports.create = function(config) {
     global.mainWindow.webContents.on('page-title-updated', function(ev, title) {
         trayIcon.setToolTip(title);
     });
-};
+}
 
-function initApplicationMenu() {
+export function initApplicationMenu(): void {
     if (!trayIcon) {
         return;
     }
@@ -112,5 +117,3 @@ function initApplicationMenu() {
 
     trayIcon.setContextMenu(contextMenu);
 }
-
-exports.initApplicationMenu = initApplicationMenu;
diff --git a/src/updater.js b/src/updater.ts
similarity index 92%
rename from src/updater.js
rename to src/updater.ts
index c1050d2..7ed55c5 100644
--- a/src/updater.js
+++ b/src/updater.ts
@@ -14,19 +14,19 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-const { app, autoUpdater, ipcMain } = require('electron');
+import { app, autoUpdater, ipcMain } from "electron";
 
 const UPDATE_POLL_INTERVAL_MS = 60 * 60 * 1000;
 const INITIAL_UPDATE_DELAY_MS = 30 * 1000;
 
-function installUpdate() {
+function installUpdate(): void {
     // for some reason, quitAndInstall does not fire the
     // before-quit event, so we need to set the flag here.
     global.appQuitting = true;
     autoUpdater.quitAndInstall();
 }
 
-function pollForUpdates() {
+function pollForUpdates(): void {
     try {
         autoUpdater.checkForUpdates();
     } catch (e) {
@@ -34,8 +34,7 @@ function pollForUpdates() {
     }
 }
 
-module.exports = {};
-module.exports.start = function startAutoUpdate(updateBaseUrl) {
+export function start(updateBaseUrl: string): void {
     if (updateBaseUrl.slice(-1) !== '/') {
         updateBaseUrl = updateBaseUrl + '/';
     }
@@ -80,18 +79,25 @@ module.exports.start = function startAutoUpdate(updateBaseUrl) {
         // will fail if running in debug mode
         console.log('Couldn\'t enable update checking', err);
     }
-};
+}
 
 ipcMain.on('install_update', installUpdate);
 ipcMain.on('check_updates', pollForUpdates);
 
-function ipcChannelSendUpdateStatus(status) {
+function ipcChannelSendUpdateStatus(status: boolean | string): void {
     if (!global.mainWindow) return;
     global.mainWindow.webContents.send('check_updates', status);
 }
 
+interface ICachedUpdate {
+    releaseNotes: string;
+    releaseName: string;
+    releaseDate: Date;
+    updateURL : string;
+}
+
 // cache the latest update which has been downloaded as electron offers no api to read it
-let latestUpdateDownloaded;
+let latestUpdateDownloaded: ICachedUpdate;
 autoUpdater.on('update-available', function() {
     ipcChannelSendUpdateStatus(true);
 }).on('update-not-available', function() {
diff --git a/src/vectormenu.js b/src/vectormenu.ts
similarity index 89%
rename from src/vectormenu.js
rename to src/vectormenu.ts
index 674e346..8b6084b 100644
--- a/src/vectormenu.js
+++ b/src/vectormenu.ts
@@ -14,14 +14,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-const { app, shell, Menu } = require('electron');
-const { _t } = require('./language-helper');
+import { app, shell, Menu, MenuItem, MenuItemConstructorOptions } from 'electron';
+import { _t } from './language-helper';
 
 const isMac = process.platform === 'darwin';
 
-function buildMenuTemplate() {
+export function buildMenuTemplate(): Menu {
     // Menu template from http://electron.atom.io/docs/api/menu/, edited
-    const template = [
+    const template: Array<(MenuItemConstructorOptions) | (MenuItem)> = [
         {
             label: _t('Edit'),
             accelerator: 'e',
@@ -48,7 +48,7 @@ function buildMenuTemplate() {
                     label: _t('Paste'),
                 },
                 {
-                    role: 'pasteandmatchstyle',
+                    role: 'pasteAndMatchStyle',
                     label: _t('Paste and Match Style'),
                 },
                 {
@@ -56,7 +56,7 @@ function buildMenuTemplate() {
                     label: _t('Delete'),
                 },
                 {
-                    role: 'selectall',
+                    role: 'selectAll',
                     label: _t('Select All'),
                 },
             ],
@@ -67,30 +67,30 @@ function buildMenuTemplate() {
             submenu: [
                 { type: 'separator' },
                 {
-                    role: 'resetzoom',
+                    role: 'resetZoom',
                     accelerator: 'CmdOrCtrl+Num0',
                     visible: false,
                 },
                 {
-                    role: 'zoomin',
+                    role: 'zoomIn',
                     accelerator: 'CmdOrCtrl+NumAdd',
                     visible: false,
                 },
                 {
-                    role: 'zoomout',
+                    role: 'zoomOut',
                     accelerator: 'CmdOrCtrl+NumSub',
                     visible: false,
                 },
                 {
-                    role: 'resetzoom',
+                    role: 'resetZoom',
                     label: _t('Actual Size'),
                 },
                 {
-                    role: 'zoomin',
+                    role: 'zoomIn',
                     label: _t('Zoom In'),
                 },
                 {
-                    role: 'zoomout',
+                    role: 'zoomOut',
                     label: _t('Zoom Out'),
                 },
                 { type: 'separator' },
@@ -104,7 +104,7 @@ function buildMenuTemplate() {
                     label: _t('Toggle Full Screen'),
                 },
                 {
-                    role: 'toggledevtools',
+                    role: 'toggleDevTools',
                     label: _t('Toggle Developer Tools'),
                 },
             ],
@@ -166,7 +166,7 @@ function buildMenuTemplate() {
                     label: _t('Hide'),
                 },
                 {
-                    role: 'hideothers',
+                    role: 'hideOthers',
                     label: _t('Hide Others'),
                 },
                 {
@@ -182,17 +182,17 @@ function buildMenuTemplate() {
         });
         // Edit menu.
         // This has a 'speech' section on macOS
-        template[1].submenu.push(
+        (template[1].submenu as MenuItemConstructorOptions[]).push(
             { type: 'separator' },
             {
                 label: _t('Speech'),
                 submenu: [
                     {
-                        role: 'startspeaking',
+                        role: 'startSpeaking',
                         label: _t('Start Speaking'),
                     },
                     {
-                        role: 'stopspeaking',
+                        role: 'stopSpeaking',
                         label: _t('Stop Speaking'),
                     },
                 ],
@@ -243,6 +243,3 @@ function buildMenuTemplate() {
 
     return Menu.buildFromTemplate(template);
 }
-
-module.exports = buildMenuTemplate;
-
diff --git a/src/webcontents-handler.js b/src/webcontents-handler.ts
similarity index 75%
rename from src/webcontents-handler.js
rename to src/webcontents-handler.ts
index f209d94..2ca2b3b 100644
--- a/src/webcontents-handler.js
+++ b/src/webcontents-handler.ts
@@ -1,19 +1,49 @@
-const { clipboard, nativeImage, Menu, MenuItem, shell, dialog, ipcMain } = require('electron');
-const url = require('url');
-const fs = require('fs');
-const request = require('request');
-const path = require('path');
-const { _t } = require('./language-helper');
+/*
+Copyright 2021 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {
+    clipboard,
+    nativeImage,
+    Menu,
+    MenuItem,
+    shell,
+    dialog,
+    ipcMain,
+    NativeImage,
+    WebContents,
+    ContextMenuParams,
+    DownloadItem,
+    MenuItemConstructorOptions,
+    IpcMainEvent,
+} from 'electron';
+import url from 'url';
+import fs from 'fs';
+import request from 'request';
+import path from 'path';
+import { _t } from './language-helper';
 
 const MAILTO_PREFIX = "mailto:";
 
-const PERMITTED_URL_SCHEMES = [
+const PERMITTED_URL_SCHEMES: string[] = [
     'http:',
     'https:',
     MAILTO_PREFIX,
 ];
 
-function safeOpenURL(target) {
+function safeOpenURL(target: string): void {
     // openExternal passes the target to open/start/xdg-open,
     // so put fairly stringent limits on what can be opened
     // (for instance, open /bin/sh does indeed open a terminal
@@ -28,7 +58,7 @@ function safeOpenURL(target) {
     }
 }
 
-function onWindowOrNavigate(ev, target) {
+function onWindowOrNavigate(ev: Event, target: string): void {
     // always prevent the default: if something goes wrong,
     // we don't want to end up opening it in the electron
     // app, as we could end up opening any sort of random
@@ -37,7 +67,7 @@ function onWindowOrNavigate(ev, target) {
     safeOpenURL(target);
 }
 
-function writeNativeImage(filePath, img) {
+function writeNativeImage(filePath: string, img: NativeImage): Promise<void> {
     switch (filePath.split('.').pop().toLowerCase()) {
         case "jpg":
         case "jpeg":
@@ -50,7 +80,7 @@ function writeNativeImage(filePath, img) {
     }
 }
 
-function onLinkContextMenu(ev, params) {
+function onLinkContextMenu(ev: Event, params: ContextMenuParams, webContents: WebContents): void {
     let url = params.linkURL || params.srcURL;
 
     if (url.startsWith('vector://vector/webapp')) {
@@ -76,7 +106,7 @@ function onLinkContextMenu(ev, params) {
             label: _t('Copy image'),
             accelerator: 'c',
             click() {
-                ev.sender.copyImageAt(params.x, params.y);
+                webContents.copyImageAt(params.x, params.y);
             },
         }));
     }
@@ -140,8 +170,8 @@ function onLinkContextMenu(ev, params) {
     ev.preventDefault();
 }
 
-function _CutCopyPasteSelectContextMenus(params) {
-    const options = [];
+function CutCopyPasteSelectContextMenus(params: ContextMenuParams): MenuItemConstructorOptions[] {
+    const options: MenuItemConstructorOptions[] = [];
 
     if (params.misspelledWord) {
         params.dictionarySuggestions.forEach(word => {
@@ -180,10 +210,10 @@ function _CutCopyPasteSelectContextMenus(params) {
         accelerator: 'p',
         enabled: params.editFlags.canPaste,
     }, {
-        role: 'pasteandmatchstyle',
+        role: 'pasteAndMatchStyle',
         enabled: params.editFlags.canPaste,
     }, {
-        role: 'selectall',
+        role: 'selectAll',
         label: _t("Select All"),
         accelerator: 'a',
         enabled: params.editFlags.canSelectAll,
@@ -192,7 +222,7 @@ function _CutCopyPasteSelectContextMenus(params) {
 }
 
 function onSelectedContextMenu(ev, params) {
-    const items = _CutCopyPasteSelectContextMenus(params);
+    const items = CutCopyPasteSelectContextMenus(params);
     const popupMenu = Menu.buildFromTemplate(items);
 
     // popup() requires an options object even for no options
@@ -200,12 +230,13 @@ function onSelectedContextMenu(ev, params) {
     ev.preventDefault();
 }
 
-function onEditableContextMenu(ev, params) {
-    const items = [
+function onEditableContextMenu(ev: Event, params: ContextMenuParams) {
+    const items: MenuItemConstructorOptions[] = [
         { role: 'undo' },
         { role: 'redo', enabled: params.editFlags.canRedo },
         { type: 'separator' },
-    ].concat(_CutCopyPasteSelectContextMenus(params));
+        ...CutCopyPasteSelectContextMenus(params),
+    ];
 
     const popupMenu = Menu.buildFromTemplate(items);
 
@@ -214,20 +245,20 @@ function onEditableContextMenu(ev, params) {
     ev.preventDefault();
 }
 
-ipcMain.on('userDownloadOpen', function(ev, { path }) {
+ipcMain.on('userDownloadOpen', function(ev: IpcMainEvent, { path }) {
     shell.openPath(path);
 });
 
-module.exports = (webContents) => {
+export default (webContents: WebContents): void => {
     webContents.on('new-window', onWindowOrNavigate);
-    webContents.on('will-navigate', (ev, target) => {
+    webContents.on('will-navigate', (ev: Event, target: string): void => {
         if (target.startsWith("vector://")) return;
         return onWindowOrNavigate(ev, target);
     });
 
-    webContents.on('context-menu', function(ev, params) {
+    webContents.on('context-menu', function(ev: Event, params: ContextMenuParams): void {
         if (params.linkURL || params.srcURL) {
-            onLinkContextMenu(ev, params);
+            onLinkContextMenu(ev, params, webContents);
         } else if (params.selectionText) {
             onSelectedContextMenu(ev, params);
         } else if (params.isEditable) {
@@ -235,7 +266,7 @@ module.exports = (webContents) => {
         }
     });
 
-    webContents.session.on('will-download', (event, item) => {
+    webContents.session.on('will-download', (event: Event, item: DownloadItem): void => {
         item.once('done', (event, state) => {
             if (state === 'completed') {
                 const savePath = item.getSavePath();
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..2dedf3c
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true,
+    "resolveJsonModule": true,
+    "esModuleInterop": true,
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "es2016",
+    "noImplicitAny": false,
+    "sourceMap": false,
+    "outDir": "./lib",
+    "declaration": true,
+    "types": [
+      "node"
+    ],
+    "lib": [
+      "es2019",
+      "dom"
+    ]
+  },
+  "include": [
+    "./src/**/*.ts"
+  ]
+}
diff --git a/yarn.lock b/yarn.lock
index 4cb9b01..159e4a3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -127,6 +127,22 @@
     ajv "^6.12.0"
     ajv-keywords "^3.4.1"
 
+"@electron/get@^1.0.1":
+  version "1.12.4"
+  resolved "https://registry.yarnpkg.com/@electron/get/-/get-1.12.4.tgz#a5971113fc1bf8fa12a8789dc20152a7359f06ab"
+  integrity sha512-6nr9DbJPUR9Xujw6zD3y+rS95TyItEVM0NVjt1EehY2vUWfIgPiIPVHxCvaTS0xr2B+DRxovYVKbuOWqC35kjg==
+  dependencies:
+    debug "^4.1.1"
+    env-paths "^2.2.0"
+    fs-extra "^8.1.0"
+    got "^9.6.0"
+    progress "^2.0.3"
+    semver "^6.2.0"
+    sumchecker "^3.0.1"
+  optionalDependencies:
+    global-agent "^2.0.2"
+    global-tunnel-ng "^2.7.1"
+
 "@electron/universal@1.0.5":
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/@electron/universal/-/universal-1.0.5.tgz#b812340e4ef21da2b3ee77b2b4d35c9b86defe37"
@@ -482,11 +498,21 @@
   dependencies:
     defer-to-connect "^1.0.1"
 
+"@types/auto-launch@^5.0.1":
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/@types/auto-launch/-/auto-launch-5.0.1.tgz#388a047edc0e754d8e8978cbd9ed4672b36be2c4"
+  integrity sha512-+KQ+/koZ7sJXnf5cnCANofY6yXAdYJNEoVZEuWcwJfuWbUp9u6l09I7KhwD+ivU+cdz7JId4V5ukxscWtHdSuw==
+
 "@types/color-name@^1.1.1":
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
   integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
 
+"@types/counterpart@^0.18.1":
+  version "0.18.1"
+  resolved "https://registry.yarnpkg.com/@types/counterpart/-/counterpart-0.18.1.tgz#b1b784d9e54d9879f0a8cb12f2caedab65430fe8"
+  integrity sha512-PRuFlBBkvdDOtxlIASzTmkEFar+S66Ek48NVVTWMUjtJAdn5vyMSN8y6IZIoIymGpR36q2nZbIYazBWyFxL+IQ==
+
 "@types/debug@^4.1.5":
   version "4.1.5"
   resolved "https://registry.yarnpkg.com/@types/debug/-/debug-4.1.5.tgz#b14efa8852b7768d898906613c23f688713e02cd"
@@ -522,6 +548,11 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.14.21.tgz#d934aacc22424fe9622ebf6857370c052eae464e"
   integrity sha512-cHYfKsnwllYhjOzuC5q1VpguABBeecUp24yFluHpn/BQaVxB1CuQ1FSRZCzrPxrkIfWISXV2LbeoBthLWg0+0A==
 
+"@types/node@^14.6.2":
+  version "14.17.4"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.17.4.tgz#218712242446fc868d0e007af29a4408c7765bc0"
+  integrity sha512-8kQ3+wKGRNN0ghtEn7EGps/B8CzuBz1nXZEIGGLP2GnwbqYn4dbTs7k+VKLTq1HvZLRCIDtN3Snx1Ege8B7L5A==
+
 "@types/plist@^3.0.1":
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/@types/plist/-/plist-3.0.2.tgz#61b3727bba0f5c462fe333542534a0c3e19ccb01"
@@ -998,6 +1029,11 @@ bmp-js@^0.1.0:
   resolved "https://registry.yarnpkg.com/bmp-js/-/bmp-js-0.1.0.tgz#e05a63f796a6c1ff25f4771ec7adadc148c07233"
   integrity sha1-4Fpj95amwf8l9Hcex62twUjAcjM=
 
+boolean@^3.0.1:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/boolean/-/boolean-3.1.2.tgz#e30f210a26b02458482a8cc353ab06f262a780c2"
+  integrity sha512-YN6UmV0FfLlBVvRvNPx3pz5W/mUoYB24J4WSXOKP/OOJpi+Oq6WYqPaNTHzjI0QzwWtnvEd5CGYyQPgp1jFxnw==
+
 boxen@^1.2.1:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/boxen/-/boxen-1.3.0.tgz#55c6c39a8ba58d9c61ad22cd877532deb665a20b"
@@ -1033,7 +1069,7 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
-buffer-crc32@^0.2.1, buffer-crc32@^0.2.13:
+buffer-crc32@^0.2.1, buffer-crc32@^0.2.13, buffer-crc32@~0.2.3:
   version "0.2.13"
   resolved "https://registry.yarnpkg.com/buffer-crc32/-/buffer-crc32-0.2.13.tgz#0d333e3f00eac50aa1454abd30ef8c2a5d9a7242"
   integrity sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=
@@ -1433,7 +1469,7 @@ concat-map@0.0.1:
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
   integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
 
-concat-stream@^1.5.0:
+concat-stream@^1.5.0, concat-stream@^1.6.2:
   version "1.6.2"
   resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.6.2.tgz#904bdf194cd3122fc675c77fc4ac3d4ff0fd1a34"
   integrity sha512-27HBghJxjiZtIk3Ycvn/4kbJk/1uZuJFfuPEns6LaEvpvG1f0hTea8lilrouyo9mVc2GWdcEZ8OLoGmSADlrCw==
@@ -1459,6 +1495,14 @@ conf@^7.1.2:
     pkg-up "^3.1.0"
     semver "^7.3.2"
 
+config-chain@^1.1.11:
+  version "1.1.13"
+  resolved "https://registry.yarnpkg.com/config-chain/-/config-chain-1.1.13.tgz#fad0795aa6a6cdaff9ed1b68e9dff94372c232f4"
+  integrity sha512-qj+f8APARXHrM0hraqXYb2/bOVSV4PvJQlNZ/DVj0QrmNM2q2euizkeuVckQ57J+W0mRH6Hvi+k50M4Jul2VRQ==
+  dependencies:
+    ini "^1.3.4"
+    proto-list "~1.2.1"
+
 config-chain@^1.1.12:
   version "1.1.12"
   resolved "https://registry.yarnpkg.com/config-chain/-/config-chain-1.1.12.tgz#0fde8d091200eb5e808caf25fe618c02f48e4efa"
@@ -1508,6 +1552,11 @@ copy-concurrently@^1.0.0:
     rimraf "^2.5.4"
     run-queue "^1.0.0"
 
+core-js@^3.6.5:
+  version "3.15.1"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.15.1.tgz#6c08ab88abdf56545045ccf5fd81f47f407e7f1a"
+  integrity sha512-h8VbZYnc9pDzueiS2610IULDkpFFPunHwIpl8yRwFahAEEdSpHlTy3h3z3rKq5h11CaUdBEeRViu9AYvbxiMeg==
+
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
@@ -1618,6 +1667,13 @@ debug@3.1.0:
   dependencies:
     ms "2.0.0"
 
+debug@^2.6.9:
+  version "2.6.9"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
+  integrity sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==
+  dependencies:
+    ms "2.0.0"
+
 debug@^3.1.0:
   version "3.2.7"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.7.tgz#72580b7e9145fb39b6676f9c5e5fb100b934179a"
@@ -1729,6 +1785,11 @@ detect-newline@^2.1.0:
   resolved "https://registry.yarnpkg.com/detect-newline/-/detect-newline-2.1.0.tgz#f41f1c10be4b00e87b5f13da680759f2c5bfd3e2"
   integrity sha1-9B8cEL5LAOh7XxPaaAdZ8sW/0+I=
 
+detect-node@^2.0.4:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/detect-node/-/detect-node-2.1.0.tgz#c9c70775a49c3d03bc2c06d9a73be550f978f8b1"
+  integrity sha512-T0NIuQpnTvFDATNuHN5roPwSBG83rFsuO+MXXH9/3N1eFbn4wcPjttvjMLEPWJ0RGUYgQE7cGgS3tNxbqCGM7g==
+
 dezalgo@^1.0.0, dezalgo@~1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/dezalgo/-/dezalgo-1.0.3.tgz#7f742de066fc748bc8db820569dddce49bf0d456"
@@ -1928,6 +1989,15 @@ electron-window-state@^5.0.3:
     jsonfile "^4.0.0"
     mkdirp "^0.5.1"
 
+electron@12.0.11:
+  version "12.0.11"
+  resolved "https://registry.yarnpkg.com/electron/-/electron-12.0.11.tgz#555dc1cf663e320f2f2cbdf89319352b08fc59f2"
+  integrity sha512-6gPjcce3QCeAWZ8UVAqVy6os+86D5BcxgkIzlROxX89u+du/i7WpZXF5F1vgv419rspds9OHejP3JrJnoUGh6w==
+  dependencies:
+    "@electron/get" "^1.0.1"
+    "@types/node" "^14.6.2"
+    extract-zip "^1.0.3"
+
 emoji-regex@^7.0.1:
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-7.0.3.tgz#933a04052860c85e83c122479c4748a8e4c72156"
@@ -1938,6 +2008,11 @@ emoji-regex@^8.0.0:
   resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-8.0.0.tgz#e818fd69ce5ccfcb404594f842963bf53164cc37"
   integrity sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==
 
+encodeurl@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/encodeurl/-/encodeurl-1.0.2.tgz#ad3ff4c86ec2d029322f5a02c3a9a606c95b3f59"
+  integrity sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k=
+
 encoding@^0.1.11:
   version "0.1.13"
   resolved "https://registry.yarnpkg.com/encoding/-/encoding-0.1.13.tgz#56574afdd791f54a8e9b2785c0582a2d26210fa9"
@@ -2008,6 +2083,11 @@ es-to-primitive@^1.2.1:
     is-date-object "^1.0.1"
     is-symbol "^1.0.2"
 
+es6-error@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/es6-error/-/es6-error-4.1.1.tgz#9e3af407459deed47e9a91f9b885a84eb05c561d"
+  integrity sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==
+
 es6-promise@^4.0.3:
   version "4.2.8"
   resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.2.8.tgz#4eb21594c972bc40553d276e510539143db53e0a"
@@ -2035,6 +2115,11 @@ escape-string-regexp@^1.0.5:
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
   integrity sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
 
+escape-string-regexp@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz#14ba83a5d373e3d311e5afca29cf5bfad965bf34"
+  integrity sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==
+
 eslint-config-google@^0.14.0:
   version "0.14.0"
   resolved "https://registry.yarnpkg.com/eslint-config-google/-/eslint-config-google-0.14.0.tgz#4f5f8759ba6e11b424294a219dbfa18c508bcc1a"
@@ -2200,6 +2285,16 @@ extend@^3.0.0, extend@~3.0.2:
   resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.2.tgz#f8b1136b4071fbd8eb140aff858b1019ec2915fa"
   integrity sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==
 
+extract-zip@^1.0.3:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/extract-zip/-/extract-zip-1.7.0.tgz#556cc3ae9df7f452c493a0cfb51cc30277940927"
+  integrity sha512-xoh5G1W/PB0/27lXgMQyIhP5DSY/LhoCsOyZgb+6iMmRtCwVBo55uKaMoEYrDCKQhWvqEip5ZPKAc6eFNyf/MA==
+  dependencies:
+    concat-stream "^1.6.2"
+    debug "^2.6.9"
+    mkdirp "^0.5.4"
+    yauzl "^2.10.0"
+
 extsprintf@1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.3.0.tgz#96918440e3041a7a414f8c52e3c574eb3c3e1e05"
@@ -2230,6 +2325,13 @@ fast-levenshtein@^2.0.6:
   resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
   integrity sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=
 
+fd-slicer@~1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/fd-slicer/-/fd-slicer-1.1.0.tgz#25c7c89cb1f9077f8891bbe61d8f390eae256f1e"
+  integrity sha1-JcfInLH5B3+IkbvmHY85Dq4lbx4=
+  dependencies:
+    pend "~1.2.0"
+
 figgy-pudding@^3.4.1, figgy-pudding@^3.5.1:
   version "3.5.2"
   resolved "https://registry.yarnpkg.com/figgy-pudding/-/figgy-pudding-3.5.2.tgz#b4eee8148abb01dcf1d1ac34367d59e12fa61d6e"
@@ -2548,6 +2650,19 @@ glob@^7.1.3, glob@^7.1.4:
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
+global-agent@^2.0.2:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/global-agent/-/global-agent-2.2.0.tgz#566331b0646e6bf79429a16877685c4a1fbf76dc"
+  integrity sha512-+20KpaW6DDLqhG7JDiJpD1JvNvb8ts+TNl7BPOYcURqCrXqnN1Vf+XVOrkKJAFPqfX+oEhsdzOj1hLWkBTdNJg==
+  dependencies:
+    boolean "^3.0.1"
+    core-js "^3.6.5"
+    es6-error "^4.1.1"
+    matcher "^3.0.0"
+    roarr "^2.15.3"
+    semver "^7.3.2"
+    serialize-error "^7.0.1"
+
 global-dirs@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/global-dirs/-/global-dirs-0.1.1.tgz#b319c0dd4607f353f3be9cca4c72fc148c49f445"
@@ -2562,6 +2677,16 @@ global-dirs@^3.0.0:
   dependencies:
     ini "2.0.0"
 
+global-tunnel-ng@^2.7.1:
+  version "2.7.1"
+  resolved "https://registry.yarnpkg.com/global-tunnel-ng/-/global-tunnel-ng-2.7.1.tgz#d03b5102dfde3a69914f5ee7d86761ca35d57d8f"
+  integrity sha512-4s+DyciWBV0eK148wqXxcmVAbFVPqtc3sEtUE/GTQfuU80rySLcMhUmHKSHI7/LDj8q0gDYI1lIhRRB7ieRAqg==
+  dependencies:
+    encodeurl "^1.0.2"
+    lodash "^4.17.10"
+    npm-conf "^1.1.3"
+    tunnel "^0.0.6"
+
 global@~4.3.0:
   version "4.3.2"
   resolved "https://registry.yarnpkg.com/global/-/global-4.3.2.tgz#e76989268a6c74c38908b1305b10fc0e394e9d0f"
@@ -2582,6 +2707,13 @@ globals@^12.1.0:
   dependencies:
     type-fest "^0.8.1"
 
+globalthis@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/globalthis/-/globalthis-1.0.2.tgz#2a235d34f4d8036219f7e34929b5de9e18166b8b"
+  integrity sha512-ZQnSFO1la8P7auIOQECnm0sSuoMeaSq0EEdXMBFF2QJO4uNcwbyhSgG3MruWNbFTqCLmxVwGOl7LZ9kASvHdeQ==
+  dependencies:
+    define-properties "^1.1.3"
+
 got@^6.7.1:
   version "6.7.1"
   resolved "https://registry.yarnpkg.com/got/-/got-6.7.1.tgz#240cd05785a9a18e561dc1b44b41c763ef1e8db0"
@@ -3175,7 +3307,7 @@ json-stable-stringify-without-jsonify@^1.0.1:
   resolved "https://registry.yarnpkg.com/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz#9db7b59496ad3f3cfef30a75142d2d930ad72651"
   integrity sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=
 
-json-stringify-safe@~5.0.1:
+json-stringify-safe@^5.0.1, json-stringify-safe@~5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
   integrity sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=
@@ -3546,7 +3678,7 @@ lodash.without@~4.4.0:
   resolved "https://registry.yarnpkg.com/lodash.without/-/lodash.without-4.4.0.tgz#3cd4574a00b67bae373a94b748772640507b7aac"
   integrity sha1-PNRXSgC2e643OpS3SHcmQFB7eqw=
 
-lodash@^4.17.15, lodash@^4.17.20:
+lodash@^4.17.10, lodash@^4.17.15, lodash@^4.17.20:
   version "4.17.21"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
   integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
@@ -3621,6 +3753,13 @@ make-fetch-happen@^5.0.0:
     socks-proxy-agent "^4.0.0"
     ssri "^6.0.0"
 
+matcher@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/matcher/-/matcher-3.0.0.tgz#bd9060f4c5b70aa8041ccc6f80368760994f30ca"
+  integrity sha512-OkeDaAZ/bQCxeFAozM55PKcKU0yJMPGifLwV4Qgjitu+5MoAfSQN4lsLJeXZ1b8w0x+/Emda6MZgXS1jvsapng==
+  dependencies:
+    escape-string-regexp "^4.0.0"
+
 "matrix-web-i18n@github:matrix-org/matrix-web-i18n":
   version "1.1.2"
   resolved "https://codeload.github.com/matrix-org/matrix-web-i18n/tar.gz/63f9119bc0bc304e83d4e8e22364caa7850e7671"
@@ -3765,7 +3904,7 @@ mkdirp@^0.5.0, mkdirp@~0.5.0:
   dependencies:
     minimist "0.0.8"
 
-mkdirp@^0.5.1, mkdirp@^0.5.3, mkdirp@^0.5.5:
+mkdirp@^0.5.1, mkdirp@^0.5.3, mkdirp@^0.5.4, mkdirp@^0.5.5:
   version "0.5.5"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.5.tgz#d91cefd62d1436ca0f41620e251288d420099def"
   integrity sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==
@@ -3943,6 +4082,14 @@ npm-cache-filename@~1.0.2:
   resolved "https://registry.yarnpkg.com/npm-cache-filename/-/npm-cache-filename-1.0.2.tgz#ded306c5b0bfc870a9e9faf823bc5f283e05ae11"
   integrity sha1-3tMGxbC/yHCp6fr4I7xfKD4FrhE=
 
+npm-conf@^1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/npm-conf/-/npm-conf-1.1.3.tgz#256cc47bd0e218c259c4e9550bf413bc2192aff9"
+  integrity sha512-Yic4bZHJOt9RCFbRP3GgpqhScOY4HH3V2P8yBj6CeYq118Qr+BLXqT2JvpJ00mryLESpgOxf5XlFv4ZjXxLScw==
+  dependencies:
+    config-chain "^1.1.11"
+    pify "^3.0.0"
+
 npm-install-checks@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/npm-install-checks/-/npm-install-checks-3.0.2.tgz#ab2e32ad27baa46720706908e5b14c1852de44d9"
@@ -4478,6 +4625,11 @@ path-type@^2.0.0:
   dependencies:
     pify "^2.0.0"
 
+pend@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/pend/-/pend-1.2.0.tgz#7a57eb550a6783f9115331fcf4663d5c8e007a50"
+  integrity sha1-elfrVQpng/kRUzH89GY9XI4AelA=
+
 performance-now@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
@@ -4570,7 +4722,7 @@ process@~0.5.1:
   resolved "https://registry.yarnpkg.com/process/-/process-0.5.2.tgz#1638d8a8e34c2f440a91db95ab9aeb677fc185cf"
   integrity sha1-FjjYqONML0QKkduVq5rrZ3/Bhc8=
 
-progress@^2.0.0:
+progress@^2.0.0, progress@^2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/progress/-/progress-2.0.3.tgz#7e8cf8d8f5b8f239c1bc68beb4eb78567d572ef8"
   integrity sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==
@@ -4984,6 +5136,18 @@ rimraf@^3.0.0, rimraf@^3.0.2:
   dependencies:
     glob "^7.1.3"
 
+roarr@^2.15.3:
+  version "2.15.4"
+  resolved "https://registry.yarnpkg.com/roarr/-/roarr-2.15.4.tgz#f5fe795b7b838ccfe35dc608e0282b9eba2e7afd"
+  integrity sha512-CHhPh+UNHD2GTXNYhPWLnU8ONHdI+5DI+4EYIAOaiD63rHeYlZvyh8P+in5999TTSFgUYuKUAjzRI4mdh/p+2A==
+  dependencies:
+    boolean "^3.0.1"
+    detect-node "^2.0.4"
+    globalthis "^1.0.1"
+    json-stringify-safe "^5.0.1"
+    semver-compare "^1.0.0"
+    sprintf-js "^1.1.2"
+
 run-queue@^1.0.0, run-queue@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/run-queue/-/run-queue-1.0.3.tgz#e848396f057d223f24386924618e25694161ec47"
@@ -5018,6 +5182,11 @@ sax@>=0.6.0, sax@^1.2.4:
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
   integrity sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==
 
+semver-compare@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/semver-compare/-/semver-compare-1.0.0.tgz#0dee216a1c941ab37e9efb1788f6afc5ff5537fc"
+  integrity sha1-De4hahyUGrN+nvsXiPavxf9VN/w=
+
 semver-diff@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/semver-diff/-/semver-diff-2.1.0.tgz#4bbb8437c8d37e4b0cf1a68fd726ec6d645d6d36"
@@ -5061,6 +5230,13 @@ semver@^7.3.5:
   dependencies:
     lru-cache "^6.0.0"
 
+serialize-error@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/serialize-error/-/serialize-error-7.0.1.tgz#f1360b0447f61ffb483ec4157c737fab7d778e18"
+  integrity sha512-8I8TjW5KMOKsZQTvoxjuSIa7foAwPWGOts+6o7sgjz41/qMD9VQHEDxi6PBvK2l0MXUmqZyNpUK+T2tQaaElvw==
+  dependencies:
+    type-fest "^0.13.1"
+
 set-blocking@^2.0.0, set-blocking@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
@@ -5211,7 +5387,7 @@ split-on-first@^1.0.0:
   resolved "https://registry.yarnpkg.com/split-on-first/-/split-on-first-1.1.0.tgz#f610afeee3b12bce1d0c30425e76398b78249a5f"
   integrity sha512-43ZssAJaMusuKWL8sKUBQXHWOpq8d6CfN/u1p4gUzfJkM05C8rxTmYrkIPTXapZpORA6LkkzcUulJ8FqA7Uudw==
 
-sprintf-js@^1.0.3:
+sprintf-js@^1.0.3, sprintf-js@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.1.2.tgz#da1765262bf8c0f571749f2ad6c26300207ae673"
   integrity sha512-VE0SOVEHCk7Qc8ulkWw3ntAzXuqf7S2lvwQaDLRnUeIEaKNQJzV6BwmLKhOqT61aGhfUMrXeaBk+oDGCzvhcug==
@@ -5397,6 +5573,13 @@ strip-json-comments@~2.0.1:
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
   integrity sha1-PFMZQukIwml8DsNEhYwobHygpgo=
 
+sumchecker@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/sumchecker/-/sumchecker-3.0.1.tgz#6377e996795abb0b6d348e9b3e1dfb24345a8e42"
+  integrity sha512-MvjXzkz/BOfyVDkG0oFOtBxHX2u3gKbMHIF/dXblZsgD3BWOFLmHovIpZY7BykJdAjcqRCBi1WYBNdEC9yI7vg==
+  dependencies:
+    debug "^4.1.0"
+
 supports-color@^5.3.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"
@@ -5581,6 +5764,11 @@ tunnel-agent@^0.6.0:
   dependencies:
     safe-buffer "^5.0.1"
 
+tunnel@^0.0.6:
+  version "0.0.6"
+  resolved "https://registry.yarnpkg.com/tunnel/-/tunnel-0.0.6.tgz#72f1314b34a5b192db012324df2cc587ca47f92c"
+  integrity sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg==
+
 tweetnacl@^0.14.3, tweetnacl@~0.14.0:
   version "0.14.5"
   resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
@@ -5593,6 +5781,11 @@ type-check@^0.4.0, type-check@~0.4.0:
   dependencies:
     prelude-ls "^1.2.1"
 
+type-fest@^0.13.1:
+  version "0.13.1"
+  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.13.1.tgz#0172cb5bce80b0bd542ea348db50c7e21834d934"
+  integrity sha512-34R7HTnG0XIJcBSn5XhDd7nNFPRcXYRZrBB2O2jdKqYODldSzBAqzsWoZYYvduky73toYS/ESqxPvkDf/F0XMg==
+
 type-fest@^0.16.0:
   version "0.16.0"
   resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.16.0.tgz#3240b891a78b0deae910dbeb86553e552a148860"
@@ -5620,6 +5813,11 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
+typescript@^4.1.3:
+  version "4.3.4"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.4.tgz#3f85b986945bcf31071decdd96cf8bfa65f9dcbc"
+  integrity sha512-uauPG7XZn9F/mo+7MrsRjyvbxFpzemRjKEZXS4AK83oP2KKOJPvb+9cO/gmnv8arWZvhnjVOXz7B49m1l0e9Ew==
+
 uid-number@0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/uid-number/-/uid-number-0.0.6.tgz#0ea10e8035e8eb5b8e4449f06da1c730663baa81"
@@ -6114,6 +6312,14 @@ yargs@^8.0.2:
     y18n "^3.2.1"
     yargs-parser "^7.0.0"
 
+yauzl@^2.10.0:
+  version "2.10.0"
+  resolved "https://registry.yarnpkg.com/yauzl/-/yauzl-2.10.0.tgz#c7eb17c93e112cb1086fa6d8e51fb0667b79a5f9"
+  integrity sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=
+  dependencies:
+    buffer-crc32 "~0.2.3"
+    fd-slicer "~1.1.0"
+
 zip-stream@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/zip-stream/-/zip-stream-4.1.0.tgz#51dd326571544e36aa3f756430b313576dc8fc79"