bare-os 3.9.3: availableParallelism

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 availableParallelism in pkg:npm/bare-os@3.9.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/bare-os@3.9.3
Demonstrate these symbols/APIs:
  - availableParallelism

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.

{"case":{"caseId":"case:sha256:7fe90b35ab9c44786212534985bc6a9fb58e41420dec92b950d5867847a34698","contract":["bare-os package manifest specifies Bare addon configuration, Bare engine requirement \u003e=1.14.0, and root export with index.d.ts types and index.js default","index.d.ts exports availableParallelism function returning a number representing logical CPU core count","binding.c implements bare_os_available_parallelism wrapping uv_available_parallelism and exports availableParallelism in addon definition","index.js exports availableParallelism delegating to binding.availableParallelism and returns integer parallelism count"],"goal":"verify availableParallelism in pkg:npm/bare-os@3.9.3","kind":"HOW","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"symbols":["availableParallelism"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"subject":"pkg:npm/bare-os@3.9.3","symbols":["availableParallelism"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-bare-os-availableparallelism",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-bare-os-availableparallelism",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "bare-os": "3.9.3"
      }
    },
    "node_modules/bare-os": {
      "version": "3.9.3",
      "resolved": "https://registry.npmjs.org/bare-os/-/bare-os-3.9.3.tgz",
      "integrity": "sha512-fF4Q7QsyKVF5Rj0qvI8BgUNjqzC2JvQlpTaPLjVJVxYVUX5Zr9un+y3w1HmA4nNKdFmRBT8z/WmrjvXzXVerKQ==",
      "license": "Apache-2.0",
      "engines": {
        "bare": ">=1.14.0"
      }
    }
  }
}

{
  "name": "sample-bare-os-availableparallelism",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "bare-os": "3.9.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify availableParallelism in pkg:npm/bare-os@3.9.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-os@3.9.3"
  ],
  "symbols": [
    "availableParallelism"
  ]
}

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import fs from 'node:fs';
import path from 'node:path';

const require = createRequire(import.meta.url);

// 1. Verify package manifest and exports
const pkgPath = require.resolve('bare-os/package');
const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf8'));

assert.equal(pkg.name, 'bare-os', 'Package name must be bare-os');
assert.equal(pkg.version, '3.9.3', 'Package version must be 3.9.3');
assert.equal(pkg.addon, true, 'Package must be marked as Bare addon');
assert.equal(pkg.engines?.bare, '>=1.14.0', 'Package must specify Bare engine requirement');

assert.ok(pkg.exports, 'Package must define exports');
assert.equal(pkg.exports['.'].types, './index.d.ts', 'Root export must specify index.d.ts');
assert.equal(pkg.exports['.'].default, './index.js', 'Root export must specify index.js');

const pkgDir = path.dirname(pkgPath);

// 2. Verify TypeScript type definitions for availableParallelism
const indexDts = fs.readFileSync(path.join(pkgDir, 'index.d.ts'), 'utf8');
assert.match(
  indexDts,
  /export function availableParallelism\(\):\s*number/,
  'index.d.ts must declare availableParallelism returning a number'
);

// 3. Verify C native binding implementation for availableParallelism
const bindingC = fs.readFileSync(path.join(pkgDir, 'binding.c'), 'utf8');
assert.ok(
  bindingC.includes('bare_os_available_parallelism'),
  'binding.c must implement bare_os_available_parallelism'
);
assert.ok(
  bindingC.includes('uv_available_parallelism()'),
  'bare_os_available_parallelism must invoke uv_available_parallelism'
);
assert.ok(
  bindingC.includes('V("availableParallelism", bare_os_available_parallelism)'),
  'binding.c must register availableParallelism in addon exports'
);

// 4. Verify JavaScript API wrapper behavior in index.js via mocked addon binding
const bindingJsPath = path.join(pkgDir, 'binding.js');
let called = false;
require.cache[bindingJsPath] = {
  id: bindingJsPath,
  filename: bindingJsPath,
  loaded: true,
  exports: {
    platform: process.platform,
    arch: process.arch,
    availableParallelism: () => {
      called = true;
      return 16;
    }
  }
};

const bareOs = require('bare-os');
assert.equal(typeof bareOs.availableParallelism, 'function', 'bare-os must export availableParallelism function');
const result = bareOs.availableParallelism();
assert.equal(called, true, 'availableParallelism must delegate to binding.availableParallelism');
assert.equal(result, 16, 'availableParallelism must return the parallelism count from binding');

console.log('Contract test passed successfully.');