CodeSampleX

Ejemplo

puppeteer-core 24.4.0

Muestra verificada para npm puppeteer-core 24.4.0. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó: assert puppeteer._isPuppeteerCore is…

sha256:324d1beade001aad063805874760963ec2d7c18a6e8eb473168ab5637714a00c

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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

Caso

HOW
Objetivo
verify pkg:npm/puppeteer-core@24.4.0
Paquetes
Creado
2026-08-23T15:23:47Z

Contrato

  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

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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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      }
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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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