CodeSampleX

Exemple

puppeteer-core 24.4.0: puppeteer.launch

Échantillon vérifié pour npm puppeteer-core 24.4.0: puppeteer.launch. Le contrat s'est exécuté sur node 22 · linux alpine/x64 · docker et a réussi.

sha256:8f17732ea67d48ea5dac935c514c0bc4bcd1ebbcf67cea1b89b259bd37a63d4e

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

Preuves d'exécution

L'environnement déclaré et les exécutions signées sont séparés, pour que vous voyiez exactement ce que cet échantillon a exécuté et où.

Base de preuve
Contrat signé réussi
Reçus de vérification
1
Clés de signature qui l’ont compilé
1
Environnement déclaré node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Environnements des exécutions de vérification

Environnement Contrat Étapes Exécution
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

Cas

HOW
Objectif
verify puppeteer.launch in pkg:npm/puppeteer-core@24.4.0
Paquets
Symboles
  • puppeteer.launch
Environnement
node 22.23.2
Créé
2026-08-23T18:37:53Z

Contrat

  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

Fichiers

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

Télécharger l’artefact source (tar.gz)

Code 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.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.launch
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:ab070dd16a3c0ae68be14d8d24617c49a548cf9875514319c2bb771c33fb15ac","constraints":{"executionContext":"node"},"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.launch in pkg:npm/puppeteer-core@24.4.0","kind":"HOW","packages":["pkg:npm/puppeteer-core@24.4.0"],"schemaVersion":1,"symbols":["puppeteer.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.launch"],"verifierAdapter":"node-typescript@1"}
index.js
import puppeteer 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 };
export default puppeteer;
package-lock.json
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    "node_modules/@puppeteer/browsers": {
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      "integrity": "sha512-yTwt2KWRmCQAfhvbCRjebaSX8pV1//I0Y3g+A7f/eS7gf0l4eRJoUCvcYdVtboeU4CTOZQuqYbZNS8aBYb8ROQ==",
      "license": "Apache-2.0",
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package.json
{
  "name": "sample-puppeteer-launch",
  "version": "1.0.0",
  "description": "Clean-room sample verifying puppeteer.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.launch in pkg:npm/puppeteer-core@24.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/puppeteer-core@24.4.0"
  ],
  "symbols": [
    "puppeteer.launch"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import puppeteer, { 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');
  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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