CodeSampleX

示例

puppeteer-core 24.4.0: puppeteer.launch

已验证示例 — npm puppeteer-core 24.4.0: puppeteer.launch. contract 在 node 22 · linux alpine/x64 · docker 上运行并通过： puppeteer.launch is a function that returns a…

sha256:8f17732ea67d48ea5dac935c514c0bc4bcd1ebbcf67cea1b89b259bd37a63d4e

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
1
构建过它的签名密钥
1
声明的环境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

验证运行环境

环境 契约 阶段 运行日期
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

案例

HOW
目标
verify puppeteer.launch in pkg:npm/puppeteer-core@24.4.0
包
符号
  • puppeteer.launch
环境
node 22.23.2
创建时间
2026-08-23T18:37:53Z

契约

  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

文件

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

下载源代码构件 (tar.gz)

源代码

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",
      "resolved": "https://registry.npmjs.org/@puppeteer/browsers/-/browsers-2.8.0.tgz",
      "integrity": "sha512-yTwt2KWRmCQAfhvbCRjebaSX8pV1//I0Y3g+A7f/eS7gf0l4eRJoUCvcYdVtboeU4CTOZQuqYbZNS8aBYb8ROQ==",
      "license": "Apache-2.0",
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    },
    "node_modules/@tootallnate/quickjs-emscripten": {
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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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