CodeSampleX

Sample

puppeteer-core 24.4.0

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

sha256:324d1beade001aad063805874760963ec2d7c18a6e8eb473168ab5637714a00c

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…		 2026-08-23

Case

HOW
Goal
verify pkg:npm/puppeteer-core@24.4.0
Packages
Created
2026-08-23T15:23:47Z

Contract

  1. assert puppeteer._isPuppeteerCore is true
  2. assert puppeteer.launch requires executablePath or channel in puppeteer-core
  3. assert puppeteer.connect requires exactly one connection option
  4. assert puppeteer.launch rejects with descriptive error when executablePath is invalid
  5. assert KnownDevices provides mobile device descriptors including iPhone 15
  6. assert PredefinedNetworkConditions provides network emulation profiles including Slow 3G and Fast 4G
  7. assert puppeteer.defaultArgs generates standard Chromium launch arguments including user flags
  8. assert TimeoutError, PuppeteerError, and ProtocolError are exported Error subclasses

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 pkg:npm/puppeteer-core@24.4.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/puppeteer-core@24.4.0

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:sha256:4ec7e0a2bdec4e5e04d2f9371e36539a77fd11f8e60fab339d836b9cc99649a9","contract":["assert puppeteer._isPuppeteerCore is true","assert puppeteer.launch requires executablePath or channel in puppeteer-core","assert puppeteer.connect requires exactly one connection option","assert puppeteer.launch rejects with descriptive error when executablePath is invalid","assert KnownDevices provides mobile device descriptors including iPhone 15","assert PredefinedNetworkConditions provides network emulation profiles including Slow 3G and Fast 4G","assert puppeteer.defaultArgs generates standard Chromium launch arguments including user flags","assert TimeoutError, PuppeteerError, and ProtocolError are exported Error subclasses"],"goal":"verify pkg:npm/puppeteer-core@24.4.0","kind":"HOW","packages":["pkg:npm/puppeteer-core@24.4.0"],"schemaVersion":1},"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","verifierAdapter":"node-typescript@1"}
index.js
import puppeteer, {
  KnownDevices,
  PredefinedNetworkConditions,
  TimeoutError,
  PuppeteerError,
  ProtocolError
} from 'puppeteer-core';

/**
 * Checks if the loaded puppeteer module is puppeteer-core.
 *
 * @returns {boolean} True if puppeteer-core.
 */
export function isPuppeteerCore() {
  return puppeteer._isPuppeteerCore === true;
}

/**
 * Gets a known mobile or tablet device descriptor by name.
 *
 * @param {string} deviceName - Name of the device.
 * @returns {import('puppeteer-core').Device | undefined} Device descriptor object or undefined.
 */
export function getDeviceDescriptor(deviceName) {
  return KnownDevices[deviceName];
}

/**
 * Gets predefined network emulation conditions.
 *
 * @param {'Slow 3G' | 'Fast 3G' | 'Slow 4G' | 'Fast 4G'} conditionName - Network condition name.
 * @returns {import('puppeteer-core').NetworkConditions | undefined} Network condition metrics.
 */
export function getNetworkCondition(conditionName) {
  return PredefinedNetworkConditions[conditionName];
}

/**
 * Gets default launch arguments computed for Chromium by Puppeteer.
 *
 * @param {import('puppeteer-core').PuppeteerNodeLaunchOptions} [options] - Launch options.
 * @returns {string[]} List of command-line flags.
 */
export function getChromiumDefaultArgs(options) {
  return puppeteer.defaultArgs(options);
}

export {
  puppeteer,
  KnownDevices,
  PredefinedNetworkConditions,
  TimeoutError,
  PuppeteerError,
  ProtocolError
};
package-lock.json
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package.json
{
  "name": "sample-puppeteer-core-verification",
  "version": "1.0.0",
  "description": "Clean-room sample verifying 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 pkg:npm/puppeteer-core@24.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/puppeteer-core@24.4.0"
  ]
}
test/contract.mjs
import assert from 'node:assert';
import puppeteer, {
  KnownDevices,
  PredefinedNetworkConditions,
  TimeoutError,
  PuppeteerError,
  ProtocolError
} from 'puppeteer-core';
import {
  isPuppeteerCore,
  getDeviceDescriptor,
  getNetworkCondition,
  getChromiumDefaultArgs
} from '../index.js';

// 1. puppeteer._isPuppeteerCore flag verification
assert.strictEqual(isPuppeteerCore(), true, 'isPuppeteerCore() must return true');
assert.strictEqual(puppeteer._isPuppeteerCore, true, 'puppeteer._isPuppeteerCore must be true');

// 2. puppeteer.launch without executablePath or channel rejects in puppeteer-core
await assert.rejects(
  async () => {
    await puppeteer.launch();
  },
  (err) => {
    assert(err instanceof Error);
    assert.match(err.message, /An `executablePath` or `channel` must be specified for `puppeteer-core`/);
    return true;
  }
);

// 3. puppeteer.connect requires connection options
await assert.rejects(
  async () => {
    await puppeteer.connect({});
  },
  (err) => {
    assert(err instanceof Error);
    assert.match(err.message, /Exactly one of browserWSEndpoint, browserURL or transport must be passed to puppeteer.connect/);
    return true;
  }
);

// 4. puppeteer.launch with non-existent executablePath rejects
await assert.rejects(
  async () => {
    await puppeteer.launch({ executablePath: '/nonexistent/mock/path' });
  },
  (err) => {
    assert(err instanceof Error);
    assert.match(err.message, /Browser was not found at the configured executablePath/);
    return true;
  }
);

// 5. KnownDevices verification
const iphone = getDeviceDescriptor('iPhone 15');
assert(iphone, 'KnownDevices["iPhone 15"] must be defined');
assert.strictEqual(iphone.name, 'iPhone 15');
assert.strictEqual(typeof iphone.userAgent, 'string');
assert(iphone.userAgent.includes('iPhone OS 17_5'));
assert.deepStrictEqual(iphone.viewport, {
  width: 393,
  height: 659,
  deviceScaleFactor: 3,
  isMobile: true,
  hasTouch: true,
  isLandscape: false
});

// 6. PredefinedNetworkConditions verification
const slow3G = getNetworkCondition('Slow 3G');
assert.deepStrictEqual(slow3G, {
  download: 50000,
  upload: 50000,
  latency: 2000
});
const fast4G = getNetworkCondition('Fast 4G');
assert.deepStrictEqual(fast4G, {
  download: 1012500,
  upload: 168750,
  latency: 165
});

// 7. puppeteer.defaultArgs argument generation
const defaultArgs = getChromiumDefaultArgs({
  args: ['--custom-test-flag']
});
assert(Array.isArray(defaultArgs));
assert(defaultArgs.includes('--custom-test-flag'));
assert(defaultArgs.some(arg => arg.startsWith('--disable-background-networking')));

// 8. Error classes
const timeoutErr = new TimeoutError('Navigation timeout of 30000 ms exceeded');
assert(timeoutErr instanceof Error);
assert.strictEqual(timeoutErr.name, 'TimeoutError');
assert.strictEqual(timeoutErr.message, 'Navigation timeout of 30000 ms exceeded');

const puppeteerErr = new PuppeteerError('General puppeteer error');
assert(puppeteerErr instanceof Error);
assert.strictEqual(puppeteerErr.name, 'PuppeteerError');

const protocolErr = new ProtocolError('Protocol error message');
assert(protocolErr instanceof Error);
assert.strictEqual(protocolErr.name, 'ProtocolError');

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

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