Migrate app to TypeScript (#1637)

* Initial setup and migrated src/common

* WIP

* WIP

* WIP

* Main module basically finished

* Renderer process migrated

* Added CI step and some fixes

* Fixed remainder of issues and added proper ESLint config

* Fixed a couple issues

* Progress!

* Some more fixes

* Fixed a test

* Fix build step

* PR feedback

src/common/config/defaultPreferences.ts

@@ -0,0 +1,43 @@
+// Copyright (c) 2015-2016 Yuya Ochiai
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+/**
+ * Default user preferences. End-users can change these parameters by editing config.json
+ * @param {number} version - Scheme version. (Not application version)
+ */
+
+import {ConfigV2} from 'types/config';
+
+export const getDefaultDownloadLocation = () => {
+    switch (process.platform) {
+    case 'darwin':
+        return `/Users/${process.env.USER || process.env.USERNAME}/Downloads`;
+    case 'win32':
+        return `C:\\Users\\${process.env.USER || process.env.USERNAME}\\Downloads`;
+    default:
+        return `/home/${process.env.USER || process.env.USERNAME}/Downloads`;
+    }
+};
+
+const defaultPreferences: ConfigV2 = {
+    version: 2,
+    teams: [],
+    showTrayIcon: true,
+    trayIconTheme: 'light',
+    minimizeToTray: true,
+    notifications: {
+        flashWindow: 2,
+        bounceIcon: true,
+        bounceIconType: 'informational',
+    },
+    showUnreadBadge: true,
+    useSpellChecker: true,
+    enableHardwareAcceleration: true,
+    autostart: true,
+    spellCheckerLocale: 'en-US',
+    darkMode: false,
+    downloadLocation: getDefaultDownloadLocation(),
+};
+
+export default defaultPreferences;