typescript: Migrate default-util to typescript.

app/renderer/js/utils/default-util.ts

@@ -0,0 +1,74 @@
+import * as fs from 'fs';
+
+let app: Electron.App = null;
+let setupCompleted = false;
+if (process.type === 'renderer') {
+	app = require('electron').remote.app;
+} else {
+	app = require('electron').app;
+}
+
+const zulipDir = app.getPath('userData');
+const logDir = `${zulipDir}/Logs/`;
+const certificatesDir = `${zulipDir}/certificates/`;
+const configDir = `${zulipDir}/config/`;
+export const initSetUp = (): void => {
+	// if it is the first time the app is running
+	// create zulip dir in userData folder to
+	// avoid errors
+	if (!setupCompleted) {
+		if (!fs.existsSync(zulipDir)) {
+			fs.mkdirSync(zulipDir);
+		}
+
+		if (!fs.existsSync(logDir)) {
+			fs.mkdirSync(logDir);
+		}
+
+		if (!fs.existsSync(certificatesDir)) {
+			fs.mkdirSync(certificatesDir);
+		}
+
+		// Migrate config files from app data folder to config folder inside app
+		// data folder. This will be done once when a user updates to the new version.
+		if (!fs.existsSync(configDir)) {
+			fs.mkdirSync(configDir);
+			const domainJson = `${zulipDir}/domain.json`;
+			const certificatesJson = `${zulipDir}/certificates.json`;
+			const settingsJson = `${zulipDir}/settings.json`;
+			const updatesJson = `${zulipDir}/updates.json`;
+			const windowStateJson = `${zulipDir}/window-state.json`;
+			const configData = [
+				{
+					path: domainJson,
+					fileName: `domain.json`
+				},
+				{
+					path: certificatesJson,
+					fileName: `certificates.json`
+				},
+				{
+					path: settingsJson,
+					fileName: `settings.json`
+				},
+				{
+					path: updatesJson,
+					fileName: `updates.json`
+				}
+			];
+			configData.forEach(data => {
+				if (fs.existsSync(data.path)) {
+					fs.copyFileSync(data.path, configDir + data.fileName);
+					fs.unlinkSync(data.path);
+				}
+			});
+			// window-state.json is only deleted not moved, as the electron-window-state
+			// package will recreate the file in the config folder.
+			if (fs.existsSync(windowStateJson)) {
+				fs.unlinkSync(windowStateJson);
+			}
+		}
+
+		setupCompleted = true;
+	}
+};