fix: disable NetworkManager in DevTools (#1834)

Co-authored-by: Alex Rudenko <alexrudenko@chromium.org>

src/DevtoolsUtils.ts

@@ -144,6 +144,10 @@ const DEFAULT_FACTORY: TargetUniverseFactoryFn = async (page: Page) => {
 
   const targetManager = universe.context.get(DevTools.TargetManager);
   targetManager.observeModels(DevTools.DebuggerModel, SKIP_ALL_PAUSES);
+  targetManager.observeModels(
+    DevTools.NetworkManager.NetworkManager,
+    DISABLE_NETWORK,
+  );
 
   const target = targetManager.createTarget(
     'main',
@@ -172,6 +176,20 @@ const SKIP_ALL_PAUSES = {
   },
 };
 
+// Not recording network requests in the DevTools universe.
+//
+// The network requests are collected through pptr and there isn't a use case for
+// enabling devtools SDK's network domain.
+const DISABLE_NETWORK = {
+  modelAdded(model: DevTools.NetworkManager.NetworkManager): void {
+    void model.target().networkAgent().invoke_disable();
+  },
+
+  modelRemoved(): void {
+    // Do nothing.
+  },
+};
+
 /**
  * Constructed from Runtime.ExceptionDetails of an uncaught error.
  *

tests/DevtoolsUtils.test.ts

@@ -13,14 +13,18 @@ import {UniverseManager} from '../src/DevtoolsUtils.js';
 import {DevTools} from '../src/third_party/index.js';
 import type {Browser, Target} from '../src/third_party/index.js';
 
+import {serverHooks} from './server.js';
 import {
   getMockBrowser,
   getMockPage,
+  html,
   mockListener,
   withBrowser,
 } from './utils.js';
 
 describe('UniverseManager', () => {
+  const server = serverHooks();
+
   afterEach(() => {
     sinon.restore();
   });
@@ -86,4 +90,30 @@ describe('UniverseManager', () => {
       sinon.assert.notCalled(pausedSpy);
     });
   });
+
+  it('disables network domain', async () => {
+    server.addHtmlRoute('/test', html`<div>Test</div>`);
+
+    await withBrowser(async (browser, page) => {
+      const manager = new UniverseManager(browser);
+      await manager.init([page]);
+      const targetUniverse = manager.get(page);
+      assert.ok(targetUniverse);
+
+      const networkManager = targetUniverse.target.model(
+        DevTools.NetworkManager.NetworkManager,
+      );
+      assert.ok(networkManager);
+
+      const requestStartedSpy = sinon.stub();
+      networkManager.addEventListener(
+        DevTools.NetworkManager.Events.RequestStarted,
+        requestStartedSpy,
+      );
+
+      await page.goto(server.getRoute('/test'));
+
+      sinon.assert.notCalled(requestStartedSpy);
+    });
+  });
 });