puppeteer-core 24.4.0: puppeteer.connect

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify puppeteer.connect in pkg:npm/puppeteer-core@24.4.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/puppeteer-core@24.4.0
Demonstrate these symbols/APIs:
  - puppeteer.connect
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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      "funding": {
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}

{
  "name": "sample-puppeteer-core-connect",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of puppeteer.connect in puppeteer-core",
  "type": "module",
  "main": "src/index.js",
  "dependencies": {
    "puppeteer-core": "24.4.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify puppeteer.connect in pkg:npm/puppeteer-core@24.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/puppeteer-core@24.4.0"
  ],
  "symbols": [
    "puppeteer.connect"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import puppeteer, { connect } from 'puppeteer-core';

/**
 * Creates a mock CDP connection transport suitable for offline testing of puppeteer.connect.
 *
 * @param {object} [options]
 * @param {string} [options.product='Chrome/130.0.0.0']
 * @param {string} [options.userAgent='MockBrowser/1.0']
 * @param {string} [options.protocolVersion='1.3']
 * @returns {{ send: (msg: string) => void, close: () => void, onmessage?: (msg: string) => void, onclose?: () => void, sent: object[], isClosed: boolean }}
 */
export function createMockTransport(options = {}) {
  const product = options.product ?? 'Chrome/130.0.0.0';
  const userAgent = options.userAgent ?? 'MockBrowser/1.0';
  const protocolVersion = options.protocolVersion ?? '1.3';

  const transport = {
    sent: [],
    isClosed: false,
    onmessage: undefined,
    onclose: undefined,
    send(str) {
      const parsed = JSON.parse(str);
      this.sent.push(parsed);

      const respond = (result) => {
        queueMicrotask(() => {
          if (!this.isClosed && typeof this.onmessage === 'function') {
            this.onmessage(JSON.stringify({ id: parsed.id, result }));
          }
        });
      };

      switch (parsed.method) {
        case 'Browser.getVersion':
          respond({ protocolVersion, product, revision: '0', userAgent, jsVersion: 'V8' });
          break;
        case 'Target.getBrowserContexts':
          respond({ browserContextIds: [] });
          break;
        case 'Target.getTargets':
          respond({ targetInfos: [] });
          break;
        case 'Target.setAutoAttach':
        case 'Target.setDiscoverTargets':
        default:
          respond({});
          break;
      }
    },
    close() {
      this.isClosed = true;
      if (typeof this.onclose === 'function') {
        this.onclose();
      }
    }
  };

  return transport;
}

/**
 * Connects to an existing browser instance using puppeteer.connect.
 *
 * @param {import('puppeteer-core').ConnectOptions} options
 * @returns {Promise<import('puppeteer-core').Browser>} Connected Browser instance
 */
export async function connectBrowser(options) {
  return connect(options);
}

export { puppeteer, connect };

import assert from 'node:assert/strict';
import { puppeteer, connect, connectBrowser, createMockTransport } from '../src/index.js';

// 1. Export verification
assert.equal(typeof puppeteer, 'object', 'puppeteer default export should be an object');
assert.equal(typeof puppeteer.connect, 'function', 'puppeteer.connect must be a function');
assert.equal(typeof connect, 'function', 'connect named export must be a function');
assert.equal(typeof connectBrowser, 'function', 'connectBrowser wrapper must be a function');
assert.equal(typeof createMockTransport, 'function', 'createMockTransport helper must be a function');

// 2. Reject when no connection target is specified
await assert.rejects(
  async () => {
    await puppeteer.connect({});
  },
  {
    name: 'Error',
    message: /Exactly one of browserWSEndpoint, browserURL or transport must be passed/
  },
  'Should reject when neither browserWSEndpoint, browserURL nor transport is passed'
);

// 3. Reject when multiple connection targets are specified
await assert.rejects(
  async () => {
    const mockTransport = createMockTransport();
    await puppeteer.connect({
      browserURL: 'http://localhost:9222',
      transport: mockTransport
    });
  },
  {
    name: 'Error',
    message: /Exactly one of browserWSEndpoint, browserURL or transport must be passed/
  },
  'Should reject when multiple connection targets are passed'
);

// 4. Connect successfully using custom ConnectionTransport
const customTransport = createMockTransport({
  product: 'MockChrome/130.0.0.0',
  userAgent: 'MockChromeAgent/1.0',
  protocolVersion: '1.3'
});

const browser = await connectBrowser({
  transport: customTransport,
  defaultViewport: null
});

assert.ok(browser, 'Browser instance should be returned');
assert.equal(browser.isConnected(), true, 'browser.isConnected() should be true after connect');

// 5. Query version and userAgent via mock CDP transport
const version = await browser.version();
assert.equal(version, 'MockChrome/130.0.0.0', 'browser.version() should match mock product string');

const userAgent = await browser.userAgent();
assert.equal(userAgent, 'MockChromeAgent/1.0', 'browser.userAgent() should match mock userAgent');

const contexts = browser.browserContexts();
assert.ok(Array.isArray(contexts), 'browserContexts() should return an array');

// 6. Disconnect lifecycle
await browser.disconnect();
assert.equal(browser.isConnected(), false, 'browser.isConnected() should be false after disconnect');
assert.equal(customTransport.isClosed, true, 'transport should be closed after disconnect');

console.log('Contract assertions passed successfully.');