Hide from Dock on macOS when the tray icon is enabled and the window is closed

app/dock_icon.js

@@ -0,0 +1,17 @@
+const { app } = require('electron');
+
+const dockIcon = {};
+
+dockIcon.show = () => {
+  if (process.platform === 'darwin') {
+    app.dock.show();
+  }
+};
+
+dockIcon.hide = () => {
+  if (process.platform === 'darwin') {
+    app.dock.hide();
+  }
+};
+
+module.exports = dockIcon;