puppeteer-core 24.4.0: defaultArgs

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.

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{
  "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"
  }
}

{
  "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"
  ]
}

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
};

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);
});