CodeSampleX

Sample

puppeteer-core 24.4.0: launch

Verified sample for npm puppeteer-core 24.4.0: launch. The contract ran on node 22 · linux alpine/x64 · docker and passed: puppeteer.launch is a function…

sha256:c2b5ef59dcb970260c3a7e849f79e5d4341976221f5a9db71b223be8d026017a

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Case

HOW
Goal
verify puppeteer-core.launch in pkg:npm/puppeteer-core@24.4.0
Packages
Symbols
  • puppeteer-core.launch
Environment
node 22.23.2
Created
2026-08-28T03:17:04Z

Contract

  1. puppeteer.launch is a function that returns a Promise
  2. puppeteer.launch rejects with Error when called without executablePath or channel in puppeteer-core
  3. puppeteer.launch rejects with Error when configured executablePath does not exist
  4. puppeteer.launch rejects with Error when channel executable is not found
  5. puppeteer.defaultArgs returns standard Chromium arguments with headless=new by default
  6. puppeteer.defaultArgs omits headless flag when headless is false and sets --headless when headless is shell
  7. puppeteer.defaultArgs adds --auto-open-devtools-for-tabs when devtools is true
  8. puppeteer.defaultArgs appends custom command line flags and sets user-data-dir option

Files

  • PROMPT.md
  • csx.json
  • index.js
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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.launch 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.launch

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.
csx.json
{"case":{"caseId":"case:sha256:5bd151003eaebcdda7c972f27dcc9fbd756318230bf3925915a2db5d90c3a65e","contract":["puppeteer.launch is a function that returns a Promise","puppeteer.launch rejects with Error when called without executablePath or channel in puppeteer-core","puppeteer.launch rejects with Error when configured executablePath does not exist","puppeteer.launch rejects with Error when channel executable is not found","puppeteer.defaultArgs returns standard Chromium arguments with headless=new by default","puppeteer.defaultArgs omits headless flag when headless is false and sets --headless when headless is shell","puppeteer.defaultArgs adds --auto-open-devtools-for-tabs when devtools is true","puppeteer.defaultArgs appends custom command line flags and sets user-data-dir option"],"goal":"verify puppeteer-core.launch in pkg:npm/puppeteer-core@24.4.0","kind":"HOW","packages":["pkg:npm/puppeteer-core@24.4.0"],"schemaVersion":1,"symbols":["puppeteer-core.launch"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/puppeteer-core@24.4.0"],"schemaVersion":1,"subject":"pkg:npm/puppeteer-core@24.4.0","symbols":["puppeteer-core.launch"],"verifierAdapter":"node-typescript@1"}
index.js
import puppeteer, { launch } from 'puppeteer-core';

/**
 * Launches a browser instance using puppeteer-core.
 * In puppeteer-core, an explicit executablePath or channel is required.
 *
 * @param {import('puppeteer-core').PuppeteerNodeLaunchOptions} [options] - Launch options.
 * @returns {Promise<import('puppeteer-core').Browser>}
 */
export async function launchBrowser(options = {}) {
  return await puppeteer.launch(options);
}

/**
 * Generates default Chromium arguments based on launch options.
 *
 * @param {import('puppeteer-core').PuppeteerNodeLaunchOptions} [options] - Launch options.
 * @returns {string[]}
 */
export function getLaunchArgs(options = {}) {
  return puppeteer.defaultArgs(options);
}

export { puppeteer, launch };
export default puppeteer;
package-lock.json
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package.json
{
  "name": "sample-puppeteer-core-launch",
  "version": "1.0.0",
  "description": "Clean-room sample verifying puppeteer-core.launch in pkg:npm/puppeteer-core@24.4.0",
  "main": "index.js",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "puppeteer-core": "24.4.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify puppeteer-core.launch in pkg:npm/puppeteer-core@24.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/puppeteer-core@24.4.0"
  ],
  "symbols": [
    "puppeteer-core.launch"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import puppeteer, { launch, launchBrowser, getLaunchArgs } from '../index.js';

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

// 2. puppeteer.launch rejects with Error when called without executablePath or channel in puppeteer-core
{
  await assert.rejects(
    async () => {
      await launchBrowser();
    },
    (err) => {
      assert(err instanceof Error, 'Expected error to be an instance of Error');
      assert.match(err.message, /An `executablePath` or `channel` must be specified for `puppeteer-core`/, 'Expected missing executablePath message');
      return true;
    }
  );
}

// 3. puppeteer.launch rejects with Error when configured executablePath does not exist
{
  await assert.rejects(
    async () => {
      await launchBrowser({ executablePath: './nonexistent/mock/bin/chromium' });
    },
    (err) => {
      assert(err instanceof Error, 'Expected error to be an instance of Error');
      assert.match(err.message, /Browser was not found at the configured executablePath/, 'Expected missing browser executable error');
      return true;
    }
  );
}

// 4. puppeteer.launch rejects with Error when channel executable is not found
{
  await assert.rejects(
    async () => {
      await launchBrowser({ channel: 'chrome' });
    },
    (err) => {
      assert(err instanceof Error, 'Expected error to be an instance of Error');
      assert.match(err.message, /Could not find .* executable for channel/, 'Expected missing channel executable error');
      return true;
    }
  );
}

// 5. puppeteer.defaultArgs returns standard Chromium arguments with headless=new by default
{
  const args = getLaunchArgs();
  assert(Array.isArray(args), 'defaultArgs must return an array');
  assert(args.includes('--headless=new'), 'default args must include --headless=new by default');
  assert(args.some((a) => a.startsWith('--disable-background-networking')), 'default args must include background networking flag');
}

// 6. puppeteer.defaultArgs omits headless flag when headless is false and sets --headless when headless is shell
{
  const nonHeadlessArgs = getLaunchArgs({ headless: false });
  assert(!nonHeadlessArgs.some((a) => a.startsWith('--headless')), 'headless: false should not include --headless flags');

  const shellArgs = getLaunchArgs({ headless: 'shell' });
  assert(shellArgs.includes('--headless'), 'headless: shell should include --headless flag');
  assert(!shellArgs.includes('--headless=new'), 'headless: shell should not include --headless=new');
}

// 7. puppeteer.defaultArgs adds --auto-open-devtools-for-tabs when devtools is true
{
  const devtoolsArgs = getLaunchArgs({ devtools: true });
  assert(devtoolsArgs.includes('--auto-open-devtools-for-tabs'), 'devtools: true should include --auto-open-devtools-for-tabs');
}

// 8. puppeteer.defaultArgs appends custom command line flags and sets user-data-dir option
{
  const customArgs = getLaunchArgs({
    args: ['--no-sandbox', '--disable-gpu'],
    userDataDir: 'profile-dir'
  });
  assert(customArgs.includes('--no-sandbox'), 'args must include custom --no-sandbox');
  assert(customArgs.includes('--disable-gpu'), 'args must include custom --disable-gpu');
  assert(customArgs.some((a) => a.startsWith('--user-data-dir=') && a.endsWith('profile-dir')), 'args must include --user-data-dir');
}

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

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