UPD: ECMA2020 Linting + Working close button

src/preload.js

@@ -1,22 +1,51 @@
 // See the Electron documentation for details on how to use preload scripts:
 // https://www.electronjs.org/docs/latest/tutorial/process-model#preload-scripts
 
-const { contextBridge, ipcRenderer } = require('electron')
+const { contextBridge, ipcRenderer, BrowserWindow } = require('electron')
 
 
 // expose an API to choose available devices
 contextBridge.exposeInMainWorld('nanodevices', {
-    list() { ipcRenderer.invoke('nanodevices:list'); },
-    connect(devicename) { ipcRenderer.invoke('nanodevices:connect', devicename); },
-    disconnect() { ipcRenderer.invoke('nanodevices:disconnect'); },
-    on_device_attached(listener) { ipcRenderer.on('nanodevice-attached', (_event, value) => listener(value)); },
-    on_device_detached(listener) { ipcRenderer.on('nanodevice-detached', (_event, value) => listener(value)); },
-});
+  list() {
+    ipcRenderer.invoke('nanodevices:list')
+  },
+  connect(devicename) {
+    ipcRenderer.invoke('nanodevices:connect', devicename)
+  },
+  disconnect() {
+    ipcRenderer.invoke('nanodevices:disconnect')
+  },
+  on_device_attached(listener) {
+    ipcRenderer.on('nanodevice-attached', (_event, value) => listener(value))
+  },
+  on_device_detached(listener) {
+    ipcRenderer.on('nanodevice-detached', (_event, value) => listener(value))
+  },
+})
 
 
 // expose an API to communicate with the nano device
 contextBridge.exposeInMainWorld('nanodevice', {
-    get_value(pid, tid, vid){ ipcRenderer.invoke('nano:get', pid, tid, vid); },
-    set_value(pid, tid, vid, value){ ipcRenderer.invoke('nano:set', pid, tid, vid, value); },
-    on_value(listener){ ipcRenderer.on('nano-onvalue', (_event, value) => listener(value)); }
-});
+  get_value(pid, tid, vid) {
+    ipcRenderer.invoke('nano:get', pid, tid, vid)
+  },
+  set_value(pid, tid, vid, value) {
+    ipcRenderer.invoke('nano:set', pid, tid, vid, value)
+  },
+  on_value(listener) {
+    ipcRenderer.on('nano-onvalue', (_event, value) => listener(value))
+  },
+})
+
+// expose an API to close the app
+contextBridge.exposeInMainWorld('window', {
+  minimize() {
+    BrowserWindow.getFocusedWindow()?.minimize()
+  },
+  maximize() {
+    BrowserWindow.getFocusedWindow()?.maximize()
+  },
+  close() {
+    BrowserWindow.getFocusedWindow()?.close()
+  },
+})