CodeSampleX

Sample

puppeteer-core 24.4.0: defaultArgs

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

sha256:40287cdea3e952756ea8ea55918740504916de5c5ff6164c918d34fbcdb59d23

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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.defaultArgs in pkg:npm/puppeteer-core@24.4.0
Packages
Symbols
  • puppeteer-core.defaultArgs
Created
2026-08-28T03:15:00Z

Contract

  1. puppeteer.defaultArgs returns default chromium launch arguments array
  2. puppeteer.defaultArgs includes headless mode by default
  3. puppeteer.defaultArgs with headless false excludes headless flags
  4. puppeteer.defaultArgs with headless shell uses legacy headless flag
  5. puppeteer.defaultArgs with userDataDir adds custom user data directory argument
  6. puppeteer.defaultArgs with devtools true enables devtools and disables headless flags
  7. puppeteer.defaultArgs with custom args appends arguments to defaults

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • 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.defaultArgs 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.defaultArgs

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:sha256:03773c8eb76f336594b2da270fe8fbe149ccf6f5392a71615cbb4e1e576b0717","contract":["puppeteer.defaultArgs returns default chromium launch arguments array","puppeteer.defaultArgs includes headless mode by default","puppeteer.defaultArgs with headless false excludes headless flags","puppeteer.defaultArgs with headless shell uses legacy headless flag","puppeteer.defaultArgs with userDataDir adds custom user data directory argument","puppeteer.defaultArgs with devtools true enables devtools and disables headless flags","puppeteer.defaultArgs with custom args appends arguments to defaults"],"goal":"verify puppeteer-core.defaultArgs in pkg:npm/puppeteer-core@24.4.0","kind":"HOW","packages":["pkg:npm/puppeteer-core@24.4.0"],"schemaVersion":1,"symbols":["puppeteer-core.defaultArgs"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","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.defaultArgs"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-puppeteer-core-default-args",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room code sample for puppeteer-core defaultArgs",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "puppeteer-core": "24.4.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify puppeteer-core.defaultArgs in pkg:npm/puppeteer-core@24.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/puppeteer-core@24.4.0"
  ],
  "symbols": [
    "puppeteer-core.defaultArgs"
  ]
}
src/index.js
const puppeteer = require('puppeteer-core');

/**
 * Returns default Chromium launch arguments array configured by puppeteer-core.
 *
 * @param {object} [options] - Options for configuring default arguments.
 * @param {boolean|'shell'} [options.headless] - Headless mode option.
 * @param {string[]} [options.args] - Additional command-line arguments.
 * @param {string} [options.userDataDir] - Custom user data directory.
 * @param {boolean} [options.devtools] - Whether to auto-open DevTools panel.
 * @returns {string[]} Array of command-line arguments for Chromium.
 */
function getDefaultArgs(options) {
  return puppeteer.defaultArgs(options);
}

module.exports = {
  puppeteer,
  defaultArgs: puppeteer.defaultArgs,
  getDefaultArgs
};
test/contract.mjs
import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { puppeteer, defaultArgs, getDefaultArgs } = require('../src/index.js');

async function runContractTests() {
  // 1. puppeteer.defaultArgs returns default chromium launch arguments array
  assert.equal(typeof puppeteer.defaultArgs, 'function', 'puppeteer.defaultArgs must be a function');
  assert.equal(typeof defaultArgs, 'function', 'defaultArgs export must be a function');
  assert.equal(typeof getDefaultArgs, 'function', 'getDefaultArgs export must be a function');

  const baseArgs = defaultArgs();
  assert.ok(Array.isArray(baseArgs), 'defaultArgs() must return an array');
  assert.ok(baseArgs.includes('--disable-background-networking'), 'should include standard isolation flags');
  assert.ok(baseArgs.includes('--enable-automation'), 'should include automation flags');
  assert.ok(baseArgs.includes('about:blank'), 'should include target URL');

  // 2. puppeteer.defaultArgs includes headless mode by default
  assert.ok(baseArgs.includes('--headless=new'), 'default args should include --headless=new');

  // 3. puppeteer.defaultArgs with headless false excludes headless flags
  const nonHeadlessArgs = defaultArgs({ headless: false });
  assert.ok(Array.isArray(nonHeadlessArgs), 'non-headless args must be an array');
  assert.ok(!nonHeadlessArgs.includes('--headless=new'), 'non-headless args should not contain --headless=new');
  assert.ok(!nonHeadlessArgs.includes('--headless'), 'non-headless args should not contain --headless');

  // 4. puppeteer.defaultArgs with headless shell uses legacy headless flag
  const shellHeadlessArgs = defaultArgs({ headless: 'shell' });
  assert.ok(shellHeadlessArgs.includes('--headless'), 'headless shell should contain legacy --headless flag');
  assert.ok(!shellHeadlessArgs.includes('--headless=new'), 'headless shell should not contain --headless=new');

  // 5. puppeteer.defaultArgs with userDataDir adds custom user data directory argument
  const customProfileArgs = defaultArgs({ userDataDir: 'custom-user-data-dir' });
  assert.ok(
    customProfileArgs.some(arg => arg.startsWith('--user-data-dir=') && arg.endsWith('custom-user-data-dir')),
    'should include specified user data directory flag'
  );

  // 6. puppeteer.defaultArgs with devtools true enables devtools and disables headless flags
  const devtoolsArgs = defaultArgs({ devtools: true });
  assert.ok(
    devtoolsArgs.includes('--auto-open-devtools-for-tabs'),
    'devtools: true should include auto open devtools flag'
  );
  assert.ok(!devtoolsArgs.includes('--headless=new'), 'devtools: true should disable headless mode');
  assert.ok(!devtoolsArgs.includes('--headless'), 'devtools: true should disable legacy headless flag');

  // 7. puppeteer.defaultArgs with custom args appends arguments to defaults
  const customFlags = defaultArgs({ args: ['--custom-flag-1', '--custom-flag-2'] });
  assert.ok(customFlags.includes('--custom-flag-1'), 'should contain first custom argument');
  assert.ok(customFlags.includes('--custom-flag-2'), 'should contain second custom argument');
  assert.ok(customFlags.includes('--enable-automation'), 'should still contain base default arguments');

  console.log('All puppeteer-core.defaultArgs contract tests passed.');
}

runContractTests().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});

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