CodeSampleX

Exemplo

puppeteer-core 24.4.0: puppeteer.launch

Amostra verificada para npm puppeteer-core 24.4.0: puppeteer.launch. O contrato rodou em node 22 · linux alpine/x64 · docker e passou.

sha256:8f17732ea67d48ea5dac935c514c0bc4bcd1ebbcf67cea1b89b259bd37a63d4e

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
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 puppeteer.launch in pkg:npm/puppeteer-core@24.4.0
Pacotes
Símbolos
  • puppeteer.launch
Ambiente
node 22.23.2
Criado
2026-08-23T18:37:53Z

Contrato

  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

Arquivos

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

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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": {
      "version": "2.8.0",
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      "integrity": "sha512-yTwt2KWRmCQAfhvbCRjebaSX8pV1//I0Y3g+A7f/eS7gf0l4eRJoUCvcYdVtboeU4CTOZQuqYbZNS8aBYb8ROQ==",
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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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