Make sure that cookies are saved to disk when closing the app

src/main.js

@@ -46,6 +46,7 @@ import allowProtocolDialog from './main/allowProtocolDialog';
 import PermissionManager from './main/PermissionManager';
 import permissionRequestHandler from './main/permissionRequestHandler';
 import AppStateManager from './main/AppStateManager';
+import initCookieManager from './main/cookieManager';
 
 import SpellChecker from './main/SpellChecker';
 
@@ -423,6 +424,8 @@ app.on('ready', () => {
     }
   }
 
+  initCookieManager(session.defaultSession);
+
   mainWindow = createMainWindow(config, {
     hideOnStartup,
     linuxAppIcon: path.join(assetsDir, 'appicon.png'),

src/main/cookieManager.js

@@ -0,0 +1,22 @@
+import {app} from 'electron';
+
+function flushCookiesStore(session) {
+  session.cookies.flushStore((err) => {
+    if (err) {
+      console.log(err);
+    }
+  });
+}
+
+export default function initCookieManager(session) {
+  // Somehow cookies are not immediately saved to disk.
+  // So flush cookie store to disk manually.
+  // https://github.com/electron/electron/issues/8416
+  app.on('before-quit', () => {
+    flushCookiesStore(session);
+  });
+
+  app.on('browser-window-blur', () => {
+    flushCookiesStore(session);
+  });
+}