chore: do not leak internal page handles after closing page (#24169)

Partial fix for https://github.com/microsoft/playwright/issues/6319

After this fix, the following scenario won't leak and the context state
(cookies, storage, etc) can be reused by the new page sessions:

```js
  for (let i = 0; i < 1000; ++i) {
    const page = await context.newPage();
    await page.goto('...');
    await page.close('...');
  }
```

package-lock.json

@@ -49,6 +49,7 @@
         "eslint-plugin-notice": "^0.9.10",
         "eslint-plugin-react-hooks": "^4.3.0",
         "formidable": "^2.1.1",
+        "heapdump": "^0.3.15",
         "license-checker": "^25.0.1",
         "mime": "^3.0.0",
         "ncp": "^2.0.0",
@@ -4000,6 +4001,19 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/heapdump": {
+      "version": "0.3.15",
+      "resolved": "https://registry.npmjs.org/heapdump/-/heapdump-0.3.15.tgz",
+      "integrity": "sha512-n8aSFscI9r3gfhOcAECAtXFaQ1uy4QSke6bnaL+iymYZ/dWs9cqDqHM+rALfsHUwukUbxsdlECZ0pKmJdQ/4OA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "dependencies": {
+        "nan": "^2.13.2"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/hexoid": {
       "version": "1.0.0",
       "dev": true,
@@ -4531,6 +4545,12 @@
       "version": "2.1.2",
       "license": "MIT"
     },
+    "node_modules/nan": {
+      "version": "2.17.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.17.0.tgz",
+      "integrity": "sha512-2ZTgtl0nJsO0KQCjEpxcIr5D+Yv90plTitZt9JBfQvVJDS5seMl3FOvsh3+9CoYWXf/1l5OaZzzF6nDm4cagaQ==",
+      "dev": true
+    },
     "node_modules/nanoid": {
       "version": "3.3.6",
       "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",
@@ -9070,6 +9090,15 @@
       "integrity": "sha512-l3LCuF6MgDNwTDKkdYGEihYjt5pRPbEg46rtlmnSPlUbgmB8LOIrKJbYYFBSbnPaJexMKtiPO8hmeRjRz2Td+A==",
       "dev": true
     },
+    "heapdump": {
+      "version": "0.3.15",
+      "resolved": "https://registry.npmjs.org/heapdump/-/heapdump-0.3.15.tgz",
+      "integrity": "sha512-n8aSFscI9r3gfhOcAECAtXFaQ1uy4QSke6bnaL+iymYZ/dWs9cqDqHM+rALfsHUwukUbxsdlECZ0pKmJdQ/4OA==",
+      "dev": true,
+      "requires": {
+        "nan": "^2.13.2"
+      }
+    },
     "hexoid": {
       "version": "1.0.0",
       "dev": true
@@ -9428,6 +9457,12 @@
     "ms": {
       "version": "2.1.2"
     },
+    "nan": {
+      "version": "2.17.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.17.0.tgz",
+      "integrity": "sha512-2ZTgtl0nJsO0KQCjEpxcIr5D+Yv90plTitZt9JBfQvVJDS5seMl3FOvsh3+9CoYWXf/1l5OaZzzF6nDm4cagaQ==",
+      "dev": true
+    },
     "nanoid": {
       "version": "3.3.6",
       "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",

package.json

@@ -84,6 +84,7 @@
     "eslint-plugin-notice": "^0.9.10",
     "eslint-plugin-react-hooks": "^4.3.0",
     "formidable": "^2.1.1",
+    "heapdump": "^0.3.15",
     "license-checker": "^25.0.1",
     "mime": "^3.0.0",
     "ncp": "^2.0.0",

packages/playwright-core/src/server/dispatchers/dispatcher.ts

@@ -80,6 +80,8 @@ export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeT
   }
 
   adopt(child: DispatcherScope) {
+    if (child._parent === this)
+      return;
     const oldParent = child._parent!;
     oldParent._dispatchers.delete(child._guid);
     this._dispatchers.set(child._guid, child);

packages/playwright-core/src/server/dispatchers/elementHandlerDispatcher.ts

@@ -26,7 +26,8 @@ import type { CallMetadata } from '../instrumentation';
 import type { WritableStreamDispatcher } from './writableStreamDispatcher';
 import { assert } from '../../utils';
 import path from 'path';
-import type { PageDispatcher } from './pageDispatcher';
+import { BrowserContextDispatcher } from './browserContextDispatcher';
+import { PageDispatcher, WorkerDispatcher } from './pageDispatcher';
 
 export class ElementHandleDispatcher extends JSHandleDispatcher implements channels.ElementHandleChannel {
   _type_ElementHandle = true;
@@ -57,12 +58,12 @@ export class ElementHandleDispatcher extends JSHandleDispatcher implements chann
 
   async ownerFrame(params: channels.ElementHandleOwnerFrameParams, metadata: CallMetadata): Promise<channels.ElementHandleOwnerFrameResult> {
     const frame = await this._elementHandle.ownerFrame();
-    return { frame: frame ? FrameDispatcher.from(this.parentScope() as PageDispatcher, frame) : undefined };
+    return { frame: frame ? FrameDispatcher.from(this._browserContextDispatcher(), frame) : undefined };
   }
 
   async contentFrame(params: channels.ElementHandleContentFrameParams, metadata: CallMetadata): Promise<channels.ElementHandleContentFrameResult> {
     const frame = await this._elementHandle.contentFrame();
-    return { frame: frame ? FrameDispatcher.from(this.parentScope() as PageDispatcher, frame) : undefined };
+    return { frame: frame ? FrameDispatcher.from(this._browserContextDispatcher(), frame) : undefined };
   }
 
   async getAttribute(params: channels.ElementHandleGetAttributeParams, metadata: CallMetadata): Promise<channels.ElementHandleGetAttributeResult> {
@@ -223,4 +224,20 @@ export class ElementHandleDispatcher extends JSHandleDispatcher implements chann
   async waitForSelector(params: channels.ElementHandleWaitForSelectorParams, metadata: CallMetadata): Promise<channels.ElementHandleWaitForSelectorResult> {
     return { element: ElementHandleDispatcher.fromNullable(this.parentScope(), await this._elementHandle.waitForSelector(metadata, params.selector, params)) };
   }
+
+  private _browserContextDispatcher(): BrowserContextDispatcher {
+    const scope = this.parentScope();
+    if (scope instanceof BrowserContextDispatcher)
+      return scope;
+    if (scope instanceof PageDispatcher)
+      return scope.parentScope();
+    if ((scope instanceof WorkerDispatcher) || (scope instanceof FrameDispatcher))  {
+      const parentScope = scope.parentScope();
+      if (parentScope instanceof BrowserContextDispatcher)
+        return parentScope;
+      return parentScope.parentScope();
+    }
+    throw new Error('ElementHandle belongs to unexpected scope');
+  }
+
 }

packages/playwright-core/src/server/dispatchers/frameDispatcher.ts

@@ -26,30 +26,34 @@ import type { CallMetadata } from '../instrumentation';
 import type { WritableStreamDispatcher } from './writableStreamDispatcher';
 import { assert } from '../../utils';
 import path from 'path';
+import type { BrowserContextDispatcher } from './browserContextDispatcher';
 import type { PageDispatcher } from './pageDispatcher';
 
-export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, PageDispatcher> implements channels.FrameChannel {
+export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, BrowserContextDispatcher | PageDispatcher> implements channels.FrameChannel {
   _type_Frame = true;
   private _frame: Frame;
+  private _browserContextDispatcher: BrowserContextDispatcher;
 
-  static from(scope: PageDispatcher, frame: Frame): FrameDispatcher {
+  static from(scope: BrowserContextDispatcher, frame: Frame): FrameDispatcher {
     const result = existingDispatcher<FrameDispatcher>(frame);
     return result || new FrameDispatcher(scope, frame);
   }
 
-  static fromNullable(scope: PageDispatcher, frame: Frame | null): FrameDispatcher | undefined {
+  static fromNullable(scope: BrowserContextDispatcher, frame: Frame | null): FrameDispatcher | undefined {
     if (!frame)
       return;
     return FrameDispatcher.from(scope, frame);
   }
 
-  private constructor(scope: PageDispatcher, frame: Frame) {
+  private constructor(scope: BrowserContextDispatcher, frame: Frame) {
-    super(scope, frame, 'Frame', {
+    const pageDispatcher = existingDispatcher<PageDispatcher>(frame._page);
+    super(pageDispatcher || scope, frame, 'Frame', {
       url: frame.url(),
       name: frame.name(),
       parentFrame: FrameDispatcher.fromNullable(scope, frame.parentFrame()),
       loadStates: Array.from(frame._firedLifecycleEvents),
     });
+    this._browserContextDispatcher = scope;
     this._frame = frame;
     this.addObjectListener(Frame.Events.AddLifecycle, lifecycleEvent => {
       this._dispatchEvent('loadstate', { add: lifecycleEvent });
@@ -62,17 +66,17 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
         return;
       const params = { url: event.url, name: event.name, error: event.error ? event.error.message : undefined };
       if (event.newDocument)
-        (params as any).newDocument = { request: RequestDispatcher.fromNullable(this.parentScope().parentScope(), event.newDocument.request || null) };
+        (params as any).newDocument = { request: RequestDispatcher.fromNullable(this._browserContextDispatcher, event.newDocument.request || null) };
       this._dispatchEvent('navigated', params);
     });
   }
 
   async goto(params: channels.FrameGotoParams, metadata: CallMetadata): Promise<channels.FrameGotoResult> {
-    return { response: ResponseDispatcher.fromNullable(this.parentScope().parentScope(), await this._frame.goto(metadata, params.url, params)) };
+    return { response: ResponseDispatcher.fromNullable(this._browserContextDispatcher, await this._frame.goto(metadata, params.url, params)) };
   }
 
   async frameElement(): Promise<channels.FrameFrameElementResult> {
-    return { element: ElementHandleDispatcher.from(this.parentScope(), await this._frame.frameElement()) };
+    return { element: ElementHandleDispatcher.from(this, await this._frame.frameElement()) };
   }
 
   async evaluateExpression(params: channels.FrameEvaluateExpressionParams, metadata: CallMetadata): Promise<channels.FrameEvaluateExpressionResult> {
@@ -80,11 +84,11 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async evaluateExpressionHandle(params: channels.FrameEvaluateExpressionHandleParams, metadata: CallMetadata): Promise<channels.FrameEvaluateExpressionHandleResult> {
-    return { handle: ElementHandleDispatcher.fromJSHandle(this.parentScope(), await this._frame.evaluateExpressionHandle(params.expression, { isFunction: params.isFunction }, parseArgument(params.arg))) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this, await this._frame.evaluateExpressionHandle(params.expression, { isFunction: params.isFunction }, parseArgument(params.arg))) };
   }
 
   async waitForSelector(params: channels.FrameWaitForSelectorParams, metadata: CallMetadata): Promise<channels.FrameWaitForSelectorResult> {
-    return { element: ElementHandleDispatcher.fromNullable(this.parentScope(), await this._frame.waitForSelector(metadata, params.selector, params)) };
+    return { element: ElementHandleDispatcher.fromNullable(this, await this._frame.waitForSelector(metadata, params.selector, params)) };
   }
 
   async dispatchEvent(params: channels.FrameDispatchEventParams, metadata: CallMetadata): Promise<void> {
@@ -100,12 +104,12 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async querySelector(params: channels.FrameQuerySelectorParams, metadata: CallMetadata): Promise<channels.FrameQuerySelectorResult> {
-    return { element: ElementHandleDispatcher.fromNullable(this.parentScope(), await this._frame.querySelector(params.selector, params)) };
+    return { element: ElementHandleDispatcher.fromNullable(this, await this._frame.querySelector(params.selector, params)) };
   }
 
   async querySelectorAll(params: channels.FrameQuerySelectorAllParams, metadata: CallMetadata): Promise<channels.FrameQuerySelectorAllResult> {
     const elements = await this._frame.querySelectorAll(params.selector);
-    return { elements: elements.map(e => ElementHandleDispatcher.from(this.parentScope(), e)) };
+    return { elements: elements.map(e => ElementHandleDispatcher.from(this, e)) };
   }
 
   async queryCount(params: channels.FrameQueryCountParams): Promise<channels.FrameQueryCountResult> {
@@ -121,11 +125,11 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async addScriptTag(params: channels.FrameAddScriptTagParams, metadata: CallMetadata): Promise<channels.FrameAddScriptTagResult> {
-    return { element: ElementHandleDispatcher.from(this.parentScope(), await this._frame.addScriptTag(params)) };
+    return { element: ElementHandleDispatcher.from(this, await this._frame.addScriptTag(params)) };
   }
 
   async addStyleTag(params: channels.FrameAddStyleTagParams, metadata: CallMetadata): Promise<channels.FrameAddStyleTagResult> {
-    return { element: ElementHandleDispatcher.from(this.parentScope(), await this._frame.addStyleTag(params)) };
+    return { element: ElementHandleDispatcher.from(this, await this._frame.addStyleTag(params)) };
   }
 
   async click(params: channels.FrameClickParams, metadata: CallMetadata): Promise<void> {
@@ -249,7 +253,7 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async waitForFunction(params: channels.FrameWaitForFunctionParams, metadata: CallMetadata): Promise<channels.FrameWaitForFunctionResult> {
-    return { handle: ElementHandleDispatcher.fromJSHandle(this.parentScope(), await this._frame._waitForFunctionExpression(metadata, params.expression, params.isFunction, parseArgument(params.arg), params)) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this, await this._frame._waitForFunctionExpression(metadata, params.expression, params.isFunction, parseArgument(params.arg), params)) };
   }
 
   async title(params: channels.FrameTitleParams, metadata: CallMetadata): Promise<channels.FrameTitleResult> {

packages/playwright-core/src/server/dispatchers/jsHandleDispatcher.ts

@@ -21,8 +21,9 @@ import { ElementHandleDispatcher } from './elementHandlerDispatcher';
 import { parseSerializedValue, serializeValue } from '../../protocol/serializers';
 import type { PageDispatcher, WorkerDispatcher } from './pageDispatcher';
 import type { ElectronApplicationDispatcher } from './electronDispatcher';
+import type { FrameDispatcher } from './frameDispatcher';
 
-export type JSHandleDispatcherParentScope = PageDispatcher | WorkerDispatcher | ElectronApplicationDispatcher;
+export type JSHandleDispatcherParentScope = PageDispatcher | FrameDispatcher | WorkerDispatcher | ElectronApplicationDispatcher;
 
 export class JSHandleDispatcher extends Dispatcher<js.JSHandle, channels.JSHandleChannel, JSHandleDispatcherParentScope> implements channels.JSHandleChannel {
   _type_JSHandle = true;

packages/playwright-core/src/server/dispatchers/networkDispatchers.ts

@@ -27,8 +27,9 @@ import type { PageDispatcher } from './pageDispatcher';
 import { FrameDispatcher } from './frameDispatcher';
 import { WorkerDispatcher } from './pageDispatcher';
 
-export class RequestDispatcher extends Dispatcher<Request, channels.RequestChannel, BrowserContextDispatcher> implements channels.RequestChannel {
+export class RequestDispatcher extends Dispatcher<Request, channels.RequestChannel, BrowserContextDispatcher | PageDispatcher | FrameDispatcher> implements channels.RequestChannel {
   _type_Request: boolean;
+  private _browserContextDispatcher: BrowserContextDispatcher;
 
   static from(scope: BrowserContextDispatcher, request: Request): RequestDispatcher {
     const result = existingDispatcher<RequestDispatcher>(request);
@@ -41,8 +42,13 @@ export class RequestDispatcher extends Dispatcher<Request, channels.RequestChann
 
   private constructor(scope: BrowserContextDispatcher, request: Request) {
     const postData = request.postDataBuffer();
-    super(scope, request, 'Request', {
+    // Always try to attach request to the page, if not, frame.
-      frame: FrameDispatcher.fromNullable(scope as any as PageDispatcher, request.frame()),
+    const frame = request.frame();
+    const page = request.frame()?._page;
+    const pageDispatcher = page ? existingDispatcher<PageDispatcher>(page) : null;
+    const frameDispatcher = frame ? FrameDispatcher.from(scope, frame) : null;
+    super(pageDispatcher || frameDispatcher || scope, request, 'Request', {
+      frame: FrameDispatcher.fromNullable(scope, request.frame()),
       serviceWorker: WorkerDispatcher.fromNullable(scope, request.serviceWorker()),
       url: request.url(),
       resourceType: request.resourceType(),
@@ -53,6 +59,7 @@ export class RequestDispatcher extends Dispatcher<Request, channels.RequestChann
       redirectedFrom: RequestDispatcher.fromNullable(scope, request.redirectedFrom()),
     });
     this._type_Request = true;
+    this._browserContextDispatcher = scope;
   }
 
   async rawRequestHeaders(params?: channels.RequestRawRequestHeadersParams): Promise<channels.RequestRawRequestHeadersResult> {
@@ -60,26 +67,27 @@ export class RequestDispatcher extends Dispatcher<Request, channels.RequestChann
   }
 
   async response(): Promise<channels.RequestResponseResult> {
-    return { response: ResponseDispatcher.fromNullable(this.parentScope(), await this._object.response()) };
+    return { response: ResponseDispatcher.fromNullable(this._browserContextDispatcher, await this._object.response()) };
   }
 }
 
-export class ResponseDispatcher extends Dispatcher<Response, channels.ResponseChannel, BrowserContextDispatcher> implements channels.ResponseChannel {
+export class ResponseDispatcher extends Dispatcher<Response, channels.ResponseChannel, RequestDispatcher> implements channels.ResponseChannel {
   _type_Response = true;
 
   static from(scope: BrowserContextDispatcher, response: Response): ResponseDispatcher {
     const result = existingDispatcher<ResponseDispatcher>(response);
-    return result || new ResponseDispatcher(scope, response);
+    const requestDispatcher = RequestDispatcher.from(scope, response.request());
+    return result || new ResponseDispatcher(requestDispatcher, response);
   }
 
   static fromNullable(scope: BrowserContextDispatcher, response: Response | null): ResponseDispatcher | undefined {
     return response ? ResponseDispatcher.from(scope, response) : undefined;
   }
 
-  private constructor(scope: BrowserContextDispatcher, response: Response) {
+  private constructor(scope: RequestDispatcher, response: Response) {
     super(scope, response, 'Response', {
       // TODO: responses in popups can point to non-reported requests.
-      request: RequestDispatcher.from(scope, response.request()),
+      request: scope,
       url: response.url(),
       status: response.status(),
       statusText: response.statusText(),

packages/playwright-core/src/server/dispatchers/pageDispatcher.ts

@@ -58,7 +58,7 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
     // If we split pageCreated and pageReady, there should be no main frame during pageCreated.
 
     // We will reparent it to the page below using adopt.
-    const mainFrame = FrameDispatcher.from(parentScope as any as PageDispatcher, page.mainFrame());
+    const mainFrame = FrameDispatcher.from(parentScope, page.mainFrame());
 
     super(parentScope, page, 'Page', {
       mainFrame,
@@ -80,7 +80,7 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
       this._dispatchEvent('download', { url: download.url, suggestedFilename: download.suggestedFilename(), artifact: ArtifactDispatcher.from(parentScope, download.artifact) });
     });
     this.addObjectListener(Page.Events.FileChooser, (fileChooser: FileChooser) => this._dispatchEvent('fileChooser', {
-      element: ElementHandleDispatcher.from(this, fileChooser.element()),
+      element: ElementHandleDispatcher.from(mainFrame, fileChooser.element()),
       isMultiple: fileChooser.isMultiple()
     }));
     this.addObjectListener(Page.Events.FrameAttached, frame => this._onFrameAttached(frame));
@@ -297,11 +297,11 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
   }
 
   _onFrameAttached(frame: Frame) {
-    this._dispatchEvent('frameAttached', { frame: FrameDispatcher.from(this, frame) });
+    this._dispatchEvent('frameAttached', { frame: FrameDispatcher.from(this.parentScope(), frame) });
   }
 
   _onFrameDetached(frame: Frame) {
-    this._dispatchEvent('frameDetached', { frame: FrameDispatcher.from(this, frame) });
+    this._dispatchEvent('frameDetached', { frame: FrameDispatcher.from(this.parentScope(), frame) });
   }
 
   override _onDispose() {
@@ -346,7 +346,7 @@ export class BindingCallDispatcher extends Dispatcher<{ guid: string }, channels
 
   constructor(scope: PageDispatcher, name: string, needsHandle: boolean, source: { context: BrowserContext, page: Page, frame: Frame }, args: any[]) {
     super(scope, { guid: 'bindingCall@' + createGuid() }, 'BindingCall', {
-      frame: FrameDispatcher.from(scope, source.frame),
+      frame: FrameDispatcher.from(scope.parentScope(), source.frame),
       name,
       args: needsHandle ? undefined : args.map(serializeResult),
       handle: needsHandle ? ElementHandleDispatcher.fromJSHandle(scope, args[0] as JSHandle) : undefined,

packages/playwright-test/src/index.ts

@@ -325,7 +325,7 @@ const playwrightFixtures: Fixtures<TestFixtures, WorkerFixtures> = ({
     const testInfoImpl = testInfo as TestInfoImpl;
     const videoMode = normalizeVideoMode(video);
     const captureVideo = shouldCaptureVideo(videoMode, testInfo) && !_reuseContext;
-    const contexts = new Map<BrowserContext, { pages: Page[] }>();
+    const contexts = new Map<BrowserContext, { pagesWithVideo: Page[] }>();
 
     await use(async options => {
       const hook = hookType(testInfoImpl);
@@ -343,9 +343,10 @@ const playwrightFixtures: Fixtures<TestFixtures, WorkerFixtures> = ({
         }
       } : {};
       const context = await browser.newContext({ ...videoOptions, ...options });
-      const contextData: { pages: Page[] } = { pages: [] };
+      const contextData: { pagesWithVideo: Page[] } = { pagesWithVideo: [] };
       contexts.set(context, contextData);
-      context.on('page', page => contextData.pages.push(page));
+      if (captureVideo)
+        context.on('page', page => contextData.pagesWithVideo.push(page));
       return context;
     });
 
@@ -361,8 +362,8 @@ const playwrightFixtures: Fixtures<TestFixtures, WorkerFixtures> = ({
       const testFailed = testInfo.status !== testInfo.expectedStatus;
       const preserveVideo = captureVideo && (videoMode === 'on' || (testFailed && videoMode === 'retain-on-failure') || (videoMode === 'on-first-retry' && testInfo.retry === 1));
       if (preserveVideo) {
-        const { pages } = contexts.get(context)!;
+        const { pagesWithVideo: pagesForVideo } = contexts.get(context)!;
-        const videos = pages.map(p => p.video()).filter(Boolean) as Video[];
+        const videos = pagesForVideo.map(p => p.video()).filter(Boolean) as Video[];
         await Promise.all(videos.map(async v => {
           try {
             const savedPath = testInfo.outputPath(`video${counter ? '-' + counter : ''}.webm`);

tests/assets/title.html

@@ -1 +1,2 @@
+<!DOCTYPE html>
 <title>Woof-Woof</title>

tests/library/channels.spec.ts

@@ -69,10 +69,11 @@ it('should scope context handles', async ({ browserType, server, expectScopeStat
       { _guid: 'browser-type', objects: [
         { _guid: 'browser', objects: [
           { _guid: 'browser-context', objects: [
-            { _guid: 'request', objects: [] },
-            { _guid: 'response', objects: [] },
             { _guid: 'page', objects: [
               { _guid: 'frame', objects: [] },
+              { _guid: 'request', objects: [
+                { _guid: 'response', objects: [] },
+              ] },
             ] },
             { _guid: 'request-context', objects: [] },
             { _guid: 'tracing', objects: [] }
@@ -204,12 +205,13 @@ it('should not generate dispatchers for subresources w/o listeners', async ({ pa
             { _guid: 'browser-context', objects: [
               {
                 _guid: 'page', objects: [
-                  { _guid: 'frame', objects: [] }
+                  { _guid: 'frame', objects: [] },
+                  { _guid: 'request', objects: [
+                    { _guid: 'response', objects: [] },
+                  ] },
                 ]
               },
-              { _guid: 'request', objects: [] },
               { _guid: 'request-context', objects: [] },
-              { _guid: 'response', objects: [] },
               { _guid: 'tracing', objects: [] }
             ] },
           ]

tests/stress/heap.spec.ts

@@ -47,3 +47,37 @@ test('should not leak server-side objects', async ({ page }) => {
   expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/browserContext').BrowserContext)).toBe(4);
   expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/browser').Browser)).toBe(4);
 });
+
+test('should not leak dispatchers after closing page', async ({ context, server }) => {
+  const pages = [];
+  const COUNT = 5;
+  for (let i = 0; i < COUNT; ++i) {
+    const page = await context.newPage();
+    // ensure listeners are registered
+    page.on('console', () => {});
+    await page.goto(server.PREFIX + '/title.html');
+    await page.evaluate(async i => {
+      console.log('message', i);
+    }, i);
+    pages.push(page);
+  }
+
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/page').Page)).toBe(COUNT);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/dispatchers/networkDispatchers').RequestDispatcher)).toBe(COUNT);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/dispatchers/networkDispatchers').ResponseDispatcher)).toBe(COUNT);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/dispatchers/consoleMessageDispatcher').ConsoleMessageDispatcher)).toBe(COUNT);
+
+  for (const page of pages)
+    await page.close();
+  pages.length = 0;
+
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/page').Page)).toBe(0);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/dispatchers/networkDispatchers').RequestDispatcher)).toBe(0);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/dispatchers/networkDispatchers').ResponseDispatcher)).toBe(0);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/dispatchers/consoleMessageDispatcher').ConsoleMessageDispatcher)).toBe(0);
+
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/client/page').Page)).toBeLessThan(COUNT);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/server/page').Page)).toBe(0);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/client/network').Request)).toBe(0);
+  expect(await queryObjectCount(require('../../packages/playwright-core/lib/client/network').Response)).toBe(0);
+});