Exemplo

jest-worker 30.4.1: Worker

Amostra verificada para npm jest-worker 30.4.1: Worker. O contrato rodou em node 22 · linux alpine/x64 · docker e passou: Worker requires an absolute worker…

sha256:7c3975a90f3e37d46c54c5c93091a808833b5368e8c54d7d897386c515d47194

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…	2026-08-27

Caso

HOW

Objetivo: verify pkg:npm/jest-worker@30.4.1
Pacotes: jest-worker 30.4.1
Símbolos: Worker
Ambiente: node 22.23.2
Criado: 2026-08-27T22:36:49Z

Contrato

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

Arquivos

PROMPT.md
csx.json
package-lock.json
package.json
spec.json
src/index.mjs
src/workerService.cjs
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 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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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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