One instance

Author: Yadro

src/main.dev.ts

@@ -34,6 +34,22 @@ export default class AppUpdater {
 
 let mainWindow: BrowserWindow | null = null;
 
+const gotTheLock = app.requestSingleInstanceLock();
+
+if (!gotTheLock) {
+  app.quit();
+} else {
+  app.on('second-instance', () => {
+    // Someone tried to run a second instance, we should focus our window.
+    if (mainWindow) {
+      if (mainWindow.isMinimized()) {
+        mainWindow.restore();
+      }
+      mainWindow.focus();
+    }
+  });
+}
+
 if (process.env.NODE_ENV === 'production') {
   const sourceMapSupport = require('source-map-support');
   sourceMapSupport.install();