fix: close and recreate macOS windows safely

electron/main/window-provider.ts

@@ -0,0 +1,39 @@
+import type { BrowserWindow } from 'electron';
+
+export type MainWindowProvider = BrowserWindow | (() => BrowserWindow | null);
+export type EnsureMainWindow = () => BrowserWindow | null;
+
+export function resolveMainWindow(provider: MainWindowProvider): BrowserWindow | null {
+  const window = typeof provider === 'function' ? provider() : provider;
+  return window && !window.isDestroyed?.() ? window : null;
+}
+
+export function showMainWindow(window: BrowserWindow | null): void {
+  if (!window || window.isDestroyed()) return;
+  if (window.isMinimized()) window.restore();
+  window.show();
+  window.focus();
+}
+
+/** A newly reopened renderer must finish loading before it can receive menu actions. */
+export function sendWhenWindowReady(
+  window: BrowserWindow | null,
+  channel: string,
+  ...args: unknown[]
+): void {
+  if (!window || window.isDestroyed() || window.webContents.isDestroyed()) return;
+  const contents = window.webContents;
+  const send = (): void => {
+    contents.removeListener('destroyed', cancel);
+    if (!window.isDestroyed() && !contents.isDestroyed()) contents.send(channel, ...args);
+  };
+  const cancel = (): void => {
+    contents.removeListener('did-finish-load', send);
+  };
+  if (contents.isLoadingMainFrame() || !contents.getURL()) {
+    contents.once('did-finish-load', send);
+    contents.once('destroyed', cancel);
+  } else {
+    send();
+  }
+}