puppeteer-core 24.4.0: 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-core.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-core.connect

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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import puppeteer from 'puppeteer-core';

/**
 * Connects to an existing browser instance using puppeteer-core.
 * Requires exactly one of browserWSEndpoint, browserURL, or transport.
 *
 * @param {import('puppeteer-core').ConnectOptions} options - Connection options.
 * @returns {Promise<import('puppeteer-core').Browser>}
 */
export async function connectBrowser(options) {
  return await puppeteer.connect(options);
}

export { puppeteer };
export default puppeteer;

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      "dependencies": {
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{
  "name": "sample-puppeteer-connect",
  "version": "1.0.0",
  "description": "Clean-room sample verifying puppeteer-core.connect in pkg:npm/puppeteer-core@24.4.0",
  "main": "index.js",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "puppeteer-core": "24.4.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify puppeteer-core.connect in pkg:npm/puppeteer-core@24.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/puppeteer-core@24.4.0"
  ],
  "symbols": [
    "puppeteer-core.connect"
  ]
}

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

// 1. puppeteer.connect is a function that returns a Promise
{
  assert.strictEqual(typeof puppeteer.connect, 'function', 'puppeteer.connect must be a function');
  assert.strictEqual(typeof connectBrowser, 'function', 'connectBrowser helper must be a function');
  const promise = puppeteer.connect().catch(() => {});
  assert(promise instanceof Promise, 'puppeteer.connect() must return a Promise');
  await promise;
}

// 2. puppeteer.connect rejects with TypeError when options argument is omitted
{
  await assert.rejects(
    async () => {
      await puppeteer.connect();
    },
    (err) => {
      assert(err instanceof TypeError, 'Expected TypeError when options are omitted');
      assert.match(err.message, /Cannot destructure property 'browserWSEndpoint'/, 'Expected destructure error message');
      return true;
    }
  );
}

// 3. puppeteer.connect rejects with Error when called with empty options object
{
  await assert.rejects(
    async () => {
      await connectBrowser({});
    },
    (err) => {
      assert(err instanceof Error, 'Expected Error when called with empty options');
      assert.match(
        err.message,
        /Exactly one of browserWSEndpoint, browserURL or transport must be passed to puppeteer\.connect/,
        'Expected missing endpoint error'
      );
      return true;
    }
  );
}

// 4. puppeteer.connect rejects with Error when multiple conflicting connection endpoints are specified
{
  await assert.rejects(
    async () => {
      await connectBrowser({
        browserWSEndpoint: 'ws://127.0.0.1:9222',
        browserURL: 'http://127.0.0.1:9222'
      });
    },
    (err) => {
      assert(err instanceof Error, 'Expected Error when both browserWSEndpoint and browserURL are passed');
      assert.match(
        err.message,
        /Exactly one of browserWSEndpoint, browserURL or transport must be passed to puppeteer\.connect/
      );
      return true;
    }
  );

  await assert.rejects(
    async () => {
      await connectBrowser({
        browserWSEndpoint: 'ws://127.0.0.1:9222',
        transport: { send() {}, close() {} }
      });
    },
    (err) => {
      assert(err instanceof Error, 'Expected Error when both browserWSEndpoint and transport are passed');
      assert.match(
        err.message,
        /Exactly one of browserWSEndpoint, browserURL or transport must be passed to puppeteer\.connect/
      );
      return true;
    }
  );
}

// 5. puppeteer.connect rejects with SyntaxError when browserWSEndpoint is an invalid URL
{
  await assert.rejects(
    async () => {
      await connectBrowser({ browserWSEndpoint: 'not-a-valid-ws-url' });
    },
    (err) => {
      assert(err instanceof SyntaxError, 'Expected SyntaxError for invalid WebSocket URL');
      assert.match(err.message, /Invalid URL/);
      return true;
    }
  );
}

// 6. puppeteer.connect rejects with TypeError when browserURL is an invalid URL
{
  await assert.rejects(
    async () => {
      await connectBrowser({ browserURL: 'not-a-valid-browser-url' });
    },
    (err) => {
      assert(err instanceof TypeError, 'Expected TypeError for invalid browserURL');
      assert.match(err.message, /Invalid URL/);
      return true;
    }
  );
}

// 7. puppeteer.connect queries CDP Target.getBrowserContexts when custom transport is provided and rejects with ProtocolError on error response
{
  let requestedMethod = null;
  const transport = {
    send(msg) {
      const data = JSON.parse(msg);
      requestedMethod = data.method;
      setTimeout(() => {
        if (this.onmessage) {
          this.onmessage(
            JSON.stringify({
              id: data.id,
              error: { message: 'Method not supported', code: -32601 }
            })
          );
        }
      }, 5);
    },
    close() {}
  };

  await assert.rejects(
    async () => {
      await connectBrowser({ transport });
    },
    (err) => {
      assert.strictEqual(err.name, 'ProtocolError', 'Expected ProtocolError');
      assert.match(err.message, /Protocol error \(Target\.getBrowserContexts\): Method not supported/);
      return true;
    }
  );
  assert.strictEqual(requestedMethod, 'Target.getBrowserContexts', 'Must request Target.getBrowserContexts on CDP connect');
}

// 8. puppeteer.connect queries Browser.getVersion when protocol is webDriverBiDi and rejects with TargetCloseError when transport closes
{
  let requestedMethod = null;
  const transport = {
    send(msg) {
      const data = JSON.parse(msg);
      requestedMethod = data.method;
      setTimeout(() => {
        if (this.onclose) this.onclose();
      }, 5);
    },
    close() {}
  };

  await assert.rejects(
    async () => {
      await connectBrowser({ transport, protocol: 'webDriverBiDi' });
    },
    (err) => {
      assert.strictEqual(err.name, 'TargetCloseError', 'Expected TargetCloseError when transport closes');
      assert.match(err.message, /Protocol error \(Browser\.getVersion\): Target closed/);
      return true;
    }
  );
  assert.strictEqual(requestedMethod, 'Browser.getVersion', 'Must request Browser.getVersion on BiDi connect');
}

// 9. puppeteer.connect rejects when browserURL DevTools endpoint returns HTTP error
{
  const server = http.createServer((req, res) => {
    if (req.url === '/json/version') {
      res.writeHead(500, { 'Content-Type': 'text/plain' });
      res.end('Internal Server Error');
    } else {
      res.writeHead(404);
      res.end();
    }
  });

  await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
  const port = server.address().port;

  try {
    await assert.rejects(
      async () => {
        await connectBrowser({ browserURL: `http://127.0.0.1:${port}` });
      },
      (err) => {
        assert(err instanceof Error, 'Expected Error on failed HTTP response');
        assert.match(
          err.message,
          /Failed to fetch browser webSocket URL from http:\/\/127\.0\.0\.1:\d+\/json\/version: HTTP Internal Server Error/
        );
        return true;
      }
    );
  } finally {
    await new Promise((resolve) => server.close(resolve));
  }
}

console.log('All contract assertions passed.');