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/main/menus/tray.ts

@@ -0,0 +1,44 @@
+// Copyright (c) 2015-2016 Yuya Ochiai
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+'use strict';
+
+import {Menu, MenuItem, MenuItemConstructorOptions} from 'electron';
+import {CombinedConfig} from 'types/config';
+
+import * as WindowManager from '../windows/windowManager';
+
+function createTemplate(config: CombinedConfig) {
+    const teams = config.teams;
+    const template = [
+        ...teams.slice(0, 9).sort((teamA, teamB) => teamA.order - teamB.order).map((team) => {
+            return {
+                label: team.name,
+                click: () => {
+                    WindowManager.switchServer(team.name);
+                },
+            };
+        }), {
+            type: 'separator',
+        }, {
+            label: process.platform === 'darwin' ? 'Preferences...' : 'Settings',
+            click: () => {
+                WindowManager.showSettingsWindow();
+            },
+        }, {
+            type: 'separator',
+        }, {
+            role: 'quit',
+        },
+    ];
+    return template;
+}
+
+function createMenu(config: CombinedConfig) {
+    // TODO: Electron is enforcing certain variables that it doesn't need
+    return Menu.buildFromTemplate(createTemplate(config) as Array<MenuItemConstructorOptions | MenuItem>);
+}
+
+export default {
+    createMenu,
+};