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/utils.ts

@@ -0,0 +1,84 @@
+// Copyright (c) 2015-2016 Yuya Ochiai
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import electron, {app, BrowserWindow} from 'electron';
+import path from 'path';
+
+import {Args} from 'types/args';
+
+import {PRODUCTION} from 'common/utils/constants';
+import Utils from 'common/utils/util';
+
+const TAB_BAR_HEIGHT = 40;
+const BACK_BAR_HEIGHT = 36;
+
+export function shouldBeHiddenOnStartup(parsedArgv: Args) {
+    if (parsedArgv.hidden) {
+        return true;
+    }
+    if (process.platform === 'darwin') {
+        if (app.getLoginItemSettings().wasOpenedAsHidden) {
+            return true;
+        }
+    }
+    return false;
+}
+
+export function getWindowBoundaries(win: BrowserWindow, hasBackBar = false) {
+    const {width, height} = win.getContentBounds();
+    return getAdjustedWindowBoundaries(width, height, hasBackBar);
+}
+
+export function getAdjustedWindowBoundaries(width: number, height: number, hasBackBar = false) {
+    return {
+        x: 0,
+        y: TAB_BAR_HEIGHT + (hasBackBar ? BACK_BAR_HEIGHT : 0),
+        width,
+        height: height - TAB_BAR_HEIGHT - (hasBackBar ? BACK_BAR_HEIGHT : 0),
+    };
+}
+
+export function getLocalURLString(urlPath: string, query?: Map<string, string>, isMain?: boolean) {
+    const localURL = getLocalURL(urlPath, query, isMain);
+    return localURL.href;
+}
+
+export function getLocalURL(urlPath: string, query?: Map<string, string>, isMain?: boolean) {
+    let pathname;
+    const processPath = isMain ? '' : '/renderer';
+    const mode = Utils.runMode();
+    const protocol = 'file';
+    const hostname = '';
+    const port = '';
+    if (mode === PRODUCTION) {
+        pathname = path.join(electron.app.getAppPath(), `${processPath}/${urlPath}`);
+    } else {
+        pathname = path.resolve(__dirname, `../../dist/${processPath}/${urlPath}`); // TODO: find a better way to work with webpack on this
+    }
+    const localUrl = new URL(`${protocol}://${hostname}${port}`);
+    localUrl.pathname = pathname;
+    if (query) {
+        query.forEach((value: string, key: string) => {
+            localUrl.searchParams.append(encodeURIComponent(key), encodeURIComponent(value));
+        });
+    }
+
+    return localUrl;
+}
+
+export function getLocalPreload(file: string) {
+    if (Utils.runMode() === PRODUCTION) {
+        return path.join(electron.app.getAppPath(), `${file}`);
+    }
+    return path.resolve(__dirname, `../../dist/${file}`);
+}
+
+export function composeUserAgent() {
+    const baseUserAgent = app.userAgentFallback.split(' ');
+
+    // filter out the Mattermost tag that gets added earlier on
+    const filteredUserAgent = baseUserAgent.filter((ua) => !ua.startsWith('Mattermost'));
+
+    return `${filteredUserAgent.join(' ')} Mattermost/${app.getVersion()}`;
+}