perf: optimize app startup and background lifecycles

tests/unit/proxy-fetch.test.ts

@@ -0,0 +1,48 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { net } from 'electron';
+import { proxyAwareFetch } from '@electron/utils/proxy-fetch';
+
+const originalElectronVersion = Object.getOwnPropertyDescriptor(process.versions, 'electron');
+
+function setElectronVersion(version: string | undefined): void {
+  if (version === undefined) {
+    delete (process.versions as NodeJS.ProcessVersions & { electron?: string }).electron;
+    return;
+  }
+  Object.defineProperty(process.versions, 'electron', {
+    configurable: true,
+    value: version,
+  });
+}
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  vi.mocked(net.fetch).mockReset();
+  if (originalElectronVersion) {
+    Object.defineProperty(process.versions, 'electron', originalElectronVersion);
+  } else {
+    setElectronVersion(undefined);
+  }
+});
+
+describe('proxyAwareFetch', () => {
+  it('uses Electron net.fetch without dynamically importing the Electron namespace', async () => {
+    setElectronVersion('43.4.0');
+    const response = new Response('electron');
+    vi.mocked(net.fetch).mockResolvedValue(response);
+
+    await expect(proxyAwareFetch('https://example.test')).resolves.toBe(response);
+    expect(net.fetch).toHaveBeenCalledWith('https://example.test', undefined);
+  });
+
+  it('uses the global fetch outside Electron', async () => {
+    setElectronVersion(undefined);
+    const response = new Response('node');
+    const fetchMock = vi.fn().mockResolvedValue(response);
+    vi.stubGlobal('fetch', fetchMock);
+
+    await expect(proxyAwareFetch('https://example.test')).resolves.toBe(response);
+    expect(fetchMock).toHaveBeenCalledWith('https://example.test', undefined);
+    expect(net.fetch).not.toHaveBeenCalled();
+  });
+});