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/renderer/notificationSounds.ts

@@ -0,0 +1,30 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {throttle} from 'underscore';
+
+import ding from 'static/sounds/ding.mp3';
+import bing from 'static/sounds/bing.mp3';
+import crackle from 'static/sounds/crackle.mp3';
+import down from 'static/sounds/down.mp3';
+import hello from 'static/sounds/hello.mp3';
+import ripple from 'static/sounds/ripple.mp3';
+import upstairs from 'static/sounds/upstairs.mp3';
+
+export const DEFAULT_WIN7 = 'Ding';
+const notificationSounds = new Map([
+    [DEFAULT_WIN7, ding],
+    ['Bing', bing],
+    ['Crackle', crackle],
+    ['Down', down],
+    ['Hello', hello],
+    ['Ripple', ripple],
+    ['Upstairs', upstairs],
+]);
+
+export const playSound = throttle((soundName: string) => {
+    if (soundName) {
+        const audio = new Audio(notificationSounds.get(soundName));
+        audio.play();
+    }
+}, 3000, {trailing: false});