CodeSampleX

Пример

jest-worker 30.4.1: Worker

Проверенный пример — npm jest-worker 30.4.1: Worker. Контракт выполнен на node 22 · linux alpine/x64 · docker и пройден: Worker requires an absolute worker…

sha256:7c3975a90f3e37d46c54c5c93091a808833b5368e8c54d7d897386c515d47194

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Кейс

HOW
Цель
verify pkg:npm/jest-worker@30.4.1
Пакеты
Символы
  • Worker
Окружение
node 22.23.2
Создан
2026-08-27T22:36:49Z

Контракт

  1. Worker requires an absolute worker path upon instantiation
  2. Worker supports instantiation with a file URL
  3. Worker executes exposed module methods in parallel worker threads and returns resolved results
  4. Worker propagates exceptions thrown in worker methods as rejected promises
  5. Worker supports custom sticky routing using computeWorkerKey
  6. Worker provides stdout and stderr readable streams via getStdout and getStderr
  7. Worker supports custom TaskQueue implementations including FifoQueue and PriorityQueue
  8. Worker end gracefully terminates the worker farm and rejects subsequent method calls

Файлы

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • src/workerService.cjs
  • 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/jest-worker@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-worker@30.4.1
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:sha256:47ff3048368e1dd986900b45d1aece9e72173e5f643144917d5f29ae4f93dc8c","constraints":{"executionContext":"node"},"contract":["Worker requires an absolute worker path upon instantiation","Worker supports instantiation with a file URL","Worker executes exposed module methods in parallel worker threads and returns resolved results","Worker propagates exceptions thrown in worker methods as rejected promises","Worker supports custom sticky routing using computeWorkerKey","Worker provides stdout and stderr readable streams via getStdout and getStderr","Worker supports custom TaskQueue implementations including FifoQueue and PriorityQueue","Worker end gracefully terminates the worker farm and rejects subsequent method calls"],"goal":"verify pkg:npm/jest-worker@30.4.1","kind":"HOW","packages":["pkg:npm/jest-worker@30.4.1"],"schemaVersion":1,"symbols":["Worker"]},"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/jest-worker@30.4.1"],"schemaVersion":1,"subject":"pkg:npm/jest-worker@30.4.1","symbols":["Worker"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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      "dependencies": {
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}
package.json
{
  "name": "sample-jest-worker",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "jest-worker": "30.4.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/jest-worker@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-worker@30.4.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { Worker, FifoQueue, PriorityQueue, messageParent } from 'jest-worker';

export { Worker, FifoQueue, PriorityQueue, messageParent };

const __dirname = path.dirname(fileURLToPath(import.meta.url));
export const DEFAULT_WORKER_PATH = path.join(__dirname, 'workerService.cjs');

/**
 * Creates a configured Worker farm for the worker service module.
 * @param {import('jest-worker').WorkerFarmOptions} [options]
 * @returns {Worker}
 */
export function createWorkerFarm(options = {}) {
  return new Worker(DEFAULT_WORKER_PATH, {
    numWorkers: 2,
    enableWorkerThreads: true,
    exposedMethods: [
      'computeSum',
      'computeProduct',
      'processTask',
      'throwingMethod',
      'echoMessage',
    ],
    ...options,
  });
}
src/workerService.cjs
'use strict';

/**
 * Worker service module executed inside worker threads or child processes.
 */

function computeSum(a, b) {
  return a + b;
}

function computeProduct(a, b) {
  return a * b;
}

function processTask(name, payload) {
  return {
    handled: true,
    task: name,
    resultLength: typeof payload === 'string' ? payload.length : 0,
  };
}

function throwingMethod(message) {
  throw new Error(message || 'Worker execution failed');
}

function echoMessage(data) {
  return data;
}

module.exports = {
  computeSum,
  computeProduct,
  processTask,
  throwingMethod,
  echoMessage,
};
test/contract.mjs
import assert from 'node:assert';
import { pathToFileURL } from 'node:url';
import {
  Worker,
  FifoQueue,
  PriorityQueue,
  createWorkerFarm,
  DEFAULT_WORKER_PATH,
} from '../src/index.mjs';

// 1. Worker requires an absolute worker path upon instantiation
{
  assert.throws(
    () => {
      new Worker('relative/path/to/worker.js');
    },
    {
      name: 'Error',
      message: "'workerPath' must be absolute, got 'relative/path/to/worker.js'",
    }
  );
}

// 2. Worker supports instantiation with a file URL
{
  const workerUrl = pathToFileURL(DEFAULT_WORKER_PATH);
  const farm = new Worker(workerUrl, {
    numWorkers: 2,
    enableWorkerThreads: true,
    exposedMethods: ['computeSum'],
  });
  const sum = await farm.computeSum(10, 32);
  assert.strictEqual(sum, 42);
  await farm.end();
}

// 3. Worker executes exposed module methods in parallel worker threads and returns resolved results
{
  const farm = createWorkerFarm();
  const sum = await farm.computeSum(15, 27);
  assert.strictEqual(sum, 42);

  const product = await farm.computeProduct(6, 7);
  assert.strictEqual(product, 42);

  const task = await farm.processTask('build', 'sample-content');
  assert.strictEqual(task.handled, true);
  assert.strictEqual(task.task, 'build');
  assert.strictEqual(task.resultLength, 14);

  const echo = await farm.echoMessage({ ok: true, count: 5 });
  assert.deepStrictEqual(echo, { ok: true, count: 5 });

  await farm.end();
}

// 4. Worker propagates exceptions thrown in worker methods as rejected promises
{
  const farm = createWorkerFarm();
  await assert.rejects(
    async () => {
      await farm.throwingMethod('invalid operation in child thread');
    },
    {
      name: 'Error',
      message: 'invalid operation in child thread',
    }
  );
  await farm.end();
}

// 5. Worker supports custom sticky routing using computeWorkerKey
{
  let keyComputed = false;
  const farm = createWorkerFarm({
    computeWorkerKey: (method, ...args) => {
      keyComputed = true;
      return `sticky-${method}-${args[0]}`;
    },
  });

  const res1 = await farm.computeSum(10, 20);
  assert.strictEqual(res1, 30);
  assert.strictEqual(keyComputed, true);

  await farm.end();
}

// 6. Worker provides stdout and stderr readable streams via getStdout and getStderr
{
  const farm = createWorkerFarm();
  const stdout = farm.getStdout();
  const stderr = farm.getStderr();

  assert.strictEqual(typeof stdout.pipe, 'function');
  assert.strictEqual(typeof stdout.on, 'function');
  assert.strictEqual(typeof stderr.pipe, 'function');
  assert.strictEqual(typeof stderr.on, 'function');

  await farm.end();
}

// 7. Worker supports custom TaskQueue implementations including FifoQueue and PriorityQueue
{
  const fifoFarm = createWorkerFarm({
    taskQueue: new FifoQueue(),
  });
  const fifoRes = await fifoFarm.computeSum(5, 5);
  assert.strictEqual(fifoRes, 10);
  await fifoFarm.end();

  const pqFarm = createWorkerFarm({
    taskQueue: new PriorityQueue((method, a) => (typeof a === 'number' ? a : 0)),
  });
  const pqRes = await pqFarm.computeProduct(3, 4);
  assert.strictEqual(pqRes, 12);
  await pqFarm.end();
}

// 8. Worker end gracefully terminates the worker farm and rejects subsequent method calls
{
  const farm = createWorkerFarm();
  const preCheck = await farm.computeSum(1, 1);
  assert.strictEqual(preCheck, 2);

  const endResult = await farm.end();
  assert.strictEqual(typeof endResult, 'object');

  await assert.rejects(
    async () => {
      await farm.computeSum(1, 2);
    },
    {
      name: 'Error',
      message: 'Farm is ended, no more calls can be done to it',
    }
  );
}

console.log('All jest-worker contract assertions passed.');

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