bare-os 3.9.3: cpus

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 cpus 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:
  - cpus

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:e4d20bda8c28096141fbc251509b0dac9379dc2917645a69331821f81c3b721f","constraints":{"executionContext":"node"},"contract":["bare-os exports cpus function in index.js delegating to native binding","index.d.ts declares cpus returning array of CPU objects with model, speed, and CPU times breakdown","binding.c implements bare_os_cpus wrapping libuv uv_cpu_info with model, speed, user, nice, sys, idle, irq fields","package manifest and prebuilt native addon binaries exist for bare-os"],"goal":"verify cpus in pkg:npm/bare-os@3.9.3","kind":"HOW","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"symbols":["cpus"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"subject":"pkg:npm/bare-os@3.9.3","symbols":["cpus"],"verifierAdapter":"node-typescript@1"}

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

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

export function getBareOsPackage() {
  const pkgPath = require.resolve('bare-os/package');
  return JSON.parse(fs.readFileSync(pkgPath, 'utf8'));
}

export function getBareOsSource() {
  const pkgDir = path.dirname(require.resolve('bare-os/package'));
  const indexJs = fs.readFileSync(path.join(pkgDir, 'index.js'), 'utf8');
  const indexDts = fs.readFileSync(path.join(pkgDir, 'index.d.ts'), 'utf8');
  const bindingC = fs.readFileSync(path.join(pkgDir, 'binding.c'), 'utf8');
  return { pkgDir, indexJs, indexDts, bindingC };
}

export function inspectCpuApiContract() {
  const { indexJs, indexDts, bindingC } = getBareOsSource();

  const hasJsExport = indexJs.includes('exports.cpus = function cpus()');
  const hasTsFunction = indexDts.includes('export function cpus():');
  const hasTimesDeclaration = indexDts.includes('times: {') && indexDts.includes('user: number') && indexDts.includes('idle: number');
  const hasBindingImpl = bindingC.includes('bare_os_cpus') && bindingC.includes('uv_cpu_info');

  return {
    hasJsExport,
    hasTsFunction,
    hasTimesDeclaration,
    hasBindingImpl,
  };
}

{
  "name": "sample-bare-os-cpus",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-bare-os-cpus",
      "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-cpus",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "bare-os": "3.9.3"
  }
}

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

import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import { getBareOsPackage, getBareOsSource, inspectCpuApiContract } from '../index.js';

// 1. Verify package manifest and metadata
const pkg = getBareOsPackage();
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.license, 'Apache-2.0', 'Package license must be Apache-2.0');
assert.equal(pkg.addon, true, 'Package must be marked as Bare addon');

// 2. Verify JavaScript export of cpus in index.js
const { pkgDir, indexJs, indexDts, bindingC } = getBareOsSource();
assert.ok(indexJs.includes('exports.cpus = function cpus()'), 'index.js must export cpus function');
assert.ok(indexJs.includes('return binding.cpus()'), 'cpus function in index.js must delegate to native binding.cpus');

// 3. Verify TypeScript declarations for cpus and CPU structure
assert.ok(indexDts.includes('export function cpus(): {'), 'index.d.ts must declare cpus function');
assert.ok(indexDts.includes('model: string'), 'cpus return type must declare model as string');
assert.ok(indexDts.includes('speed: number'), 'cpus return type must declare speed as number');
assert.ok(indexDts.includes('times: {'), 'cpus return type must declare times breakdown object');
assert.ok(indexDts.includes('user: number'), 'CPU times must declare user number');
assert.ok(indexDts.includes('nice: number'), 'CPU times must declare nice number');
assert.ok(indexDts.includes('sys: number'), 'CPU times must declare sys number');
assert.ok(indexDts.includes('idle: number'), 'CPU times must declare idle number');
assert.ok(indexDts.includes('irq: number'), 'CPU times must declare irq number');

// 4. Verify C native binding implementation for bare_os_cpus
assert.ok(bindingC.includes('bare_os_cpus'), 'binding.c must define bare_os_cpus function');
assert.ok(bindingC.includes('uv_cpu_info'), 'bare_os_cpus must call libuv uv_cpu_info');
assert.ok(bindingC.includes('V("model", js_create_string_utf8'), 'bare_os_cpus must populate model string');
assert.ok(bindingC.includes('V("speed", js_create_double'), 'bare_os_cpus must populate speed double');
assert.ok(bindingC.includes('V("times", js_create_object)'), 'bare_os_cpus must populate times object');
assert.ok(bindingC.includes('cpu.cpu_times.name'), 'bare_os_cpus must read CPU times fields');

// 5. Verify inspection helper
const check = inspectCpuApiContract();
assert.equal(check.hasJsExport, true, 'inspectCpuApiContract reports JS export present');
assert.equal(check.hasTsFunction, true, 'inspectCpuApiContract reports TS function present');
assert.equal(check.hasTimesDeclaration, true, 'inspectCpuApiContract reports times declaration present');
assert.equal(check.hasBindingImpl, true, 'inspectCpuApiContract reports binding implementation present');

// 6. Verify prebuilt native addon binaries exist
assert.ok(fs.existsSync(path.join(pkgDir, 'binding.c')), 'binding.c source must exist');
assert.ok(fs.existsSync(path.join(pkgDir, 'binding.js')), 'binding.js addon loader must exist');
assert.ok(fs.existsSync(path.join(pkgDir, 'prebuilds', 'linux-x64', 'bare-os.bare')), 'linux-x64 prebuild must exist');

console.log('Contract verification finished successfully for bare-os cpus.');