CodeSampleX

Пример

express 5.2.1

Проверенный пример — npm express 5.2.1. Контракт выполнен на node 22 · linux alpine/x64 · docker и пройден: express() creates an application instance and…

sha256:9ab8b3fc8e0562fee4c6b35848021c4df71d8b332ee57bc250caa38421deb44c

Эта сеть предлагает одно: образец, который собирается. Она запустила его в песочнице и сохранила подписанную квитанцию. Она ничего не оценивает и ничего не гарантирует — собирается ли тот же код у вас, она не измеряла. Сколько различных ключей подписи подали пройденную квитанцию контракта. Один — только автор; больше одного — значит, кто-то ещё тоже собрал. Ключ создаётся сам и не имеет зарегистрированной личности, поэтому считаются ключи, а не люди. MIT-0

Свидетельства выполнения

Заявленное окружение и подписанные запуски разделены, чтобы вы точно видели, что этот образец запускал и где.

Основа свидетельства
Подписанный контракт пройден
Квитанции проверки
1
Ключи подписи, собравшие его
1
Заявленная среда linux 24 · ubuntu · glibc 2.39 x64 npm

Среды запусков проверки

Окружение Контракт Этапы Запуск
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-20

Кейс

HOW
Цель
verify pkg:npm/express@5.2.1
Пакеты
Создан
2026-08-20T13:48:38Z

Контракт

  1. express() creates an application instance and express.Router() creates modular route handlers
  2. nested router with mergeParams: true inherits and resolves parent path parameters across route hierarchies
  3. res.set() configures custom response headers, res.cookie() sets HttpOnly and SameSite cookie options, and res.status().json() delivers formatted JSON responses
  4. async route handlers returning rejected promises automatically propagate errors to Express error-handling middleware without unhandled rejections

Файлы

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

Скачать артефакт с исходным кодом (tar.gz)

Исходный код

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/express@5.2.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/express@5.2.1

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
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package-lock.json
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package.json
{
  "name": "sample-express",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of express",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "express": "5.2.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/express@5.2.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/express@5.2.1"
  ]
}
src/index.js
const express = require('express');

/**
 * Creates and configures an Express application with async error handling,
 * nested router parameter merging, and standard response helpers.
 * @returns {import('express').Express}
 */
function createApp() {
  const app = express();

  // JSON parsing middleware
  app.use(express.json());

  // Nested router with mergeParams
  const parentRouter = express.Router();
  const childRouter = express.Router({ mergeParams: true });

  childRouter.get('/items/:itemId', (req, res) => {
    res.status(200).json({
      orgId: req.params.orgId,
      itemId: req.params.itemId
    });
  });

  parentRouter.use('/orgs/:orgId', childRouter);
  app.use('/api', parentRouter);

  // Response header and cookie demonstration
  app.get('/api/response-helpers', (req, res) => {
    res.set('X-Custom-Header', 'express-v5');
    res.cookie('auth_token', 'test-token-12345', {
      httpOnly: true,
      sameSite: 'strict',
      path: '/'
    });
    res.status(200).json({ success: true, message: 'Response helpers verified' });
  });

  // Async route handler that throws - testing native Express 5 Promise rejection handling
  app.get('/api/async-error', async (req, res) => {
    throw new Error('Async execution failed');
  });

  // Error-handling middleware
  app.use((err, req, res, next) => {
    res.status(500).json({
      error: true,
      message: err.message
    });
  });

  return app;
}

module.exports = {
  createApp,
  express
};
test/contract.mjs
import assert from 'node:assert';
import http from 'node:http';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { createApp, express } = require('../src/index.js');

// 1. Verify exports and types
assert.strictEqual(typeof express, 'function', 'express must be exported as a function');
assert.strictEqual(typeof express.Router, 'function', 'express.Router must be a function');
assert.strictEqual(typeof createApp, 'function', 'createApp must be a function');

const app = createApp();
assert.ok(app, 'app must be created');
assert.strictEqual(typeof app.listen, 'function', 'app.listen must be a function');

const server = http.createServer(app);

async function runContract() {
  await new Promise((resolve, reject) => {
    server.listen(0, '127.0.0.1', () => {
      resolve();
    });
    server.on('error', reject);
  });

  const address = server.address();
  const baseUrl = `http://127.0.0.1:${address.port}`;

  try {
    // 1. Verify nested router with mergeParams: true propagates parent route parameters
    const nestedRes = await fetch(`${baseUrl}/api/orgs/org-42/items/item-99`);
    assert.strictEqual(nestedRes.status, 200, 'Nested router should return 200');
    const nestedData = await nestedRes.json();
    assert.deepStrictEqual(nestedData, { orgId: 'org-42', itemId: 'item-99' }, 'Parent and child params should match');

    // 2. Verify response helpers (res.set, res.cookie, res.status, res.json)
    const helperRes = await fetch(`${baseUrl}/api/response-helpers`);
    assert.strictEqual(helperRes.status, 200, 'Response helpers should return 200');
    assert.strictEqual(helperRes.headers.get('x-custom-header'), 'express-v5', 'Custom header should match');
    const cookieHeader = helperRes.headers.get('set-cookie');
    assert.ok(cookieHeader && cookieHeader.includes('auth_token=test-token-12345'), 'Cookie header should contain auth_token');
    assert.ok(cookieHeader.toLowerCase().includes('httponly'), 'Cookie should be HttpOnly');
    assert.ok(cookieHeader.toLowerCase().includes('samesite=strict'), 'Cookie should have SameSite=Strict');
    const helperData = await helperRes.json();
    assert.deepStrictEqual(helperData, { success: true, message: 'Response helpers verified' });

    // 3. Verify Express 5 native async route handler rejection propagation to error middleware
    const asyncErrRes = await fetch(`${baseUrl}/api/async-error`);
    assert.strictEqual(asyncErrRes.status, 500, 'Async rejected error should be caught by error middleware with 500');
    const asyncErrData = await asyncErrRes.json();
    assert.deepStrictEqual(asyncErrData, { error: true, message: 'Async execution failed' }, 'Error middleware payload should match');

    console.log('Contract tests passed successfully.');
  } finally {
    await new Promise((resolve) => server.close(resolve));
  }
}

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});

Исходный сидер

аноним