bare-os 3.9.3: getProcessTitle

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 getProcessTitle 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:
  - getProcessTitle
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: esm
  - 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.

{"case":{"caseId":"case:sha256:e0b380d958af04396f8bf04f39021490eef7fa84124bb97d3a7bc6f5e01af67e","constraints":{"executionContext":"node"},"contract":["getProcessTitle returns string representing current process title","setProcessTitle updates process title retrievable by getProcessTitle","setProcessTitle converts non-string titles via toString","setProcessTitle throws Error when title exceeds 255 characters","bare-os exports getProcessTitle and setProcessTitle with corresponding TypeScript declarations and errors"],"goal":"verify getProcessTitle in pkg:npm/bare-os@3.9.3","kind":"HOW","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"symbols":["getProcessTitle"]},"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":["getProcessTitle"],"verifierAdapter":"node-typescript@1"}

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

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

/**
 * Initializes and loads the bare-os module with an underlying binding.
 * @param {object} [bindingMock] - Optional custom binding implementation.
 * @returns {object} The loaded bare-os module.
 */
export function loadBareOS(bindingMock) {
  const pkgPath = require.resolve('bare-os/package');
  const bindingPath = path.join(path.dirname(pkgPath), 'binding.js');

  if (!require.cache[bindingPath]) {
    let processTitle = 'bare-process';
    require.cache[bindingPath] = {
      id: bindingPath,
      filename: bindingPath,
      loaded: true,
      exports: bindingMock || {
        platform: process.platform,
        arch: process.arch,
        getProcessTitle: () => processTitle,
        setProcessTitle: (title) => {
          processTitle = title;
        },
      },
    };
  }

  return require('bare-os');
}

/**
 * Retrieves current process title using bare-os getProcessTitle().
 * @returns {string} The process title.
 */
export function getCurrentProcessTitle() {
  const os = loadBareOS();
  return os.getProcessTitle();
}

/**
 * Updates process title using bare-os setProcessTitle() and returns updated title.
 * @param {string} title - The title to set.
 * @returns {string} The updated process title.
 */
export function updateProcessTitle(title) {
  const os = loadBareOS();
  os.setProcessTitle(title);
  return os.getProcessTitle();
}

export default loadBareOS();

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

{
  "schemaVersion": 1,
  "goal": "verify getProcessTitle in pkg:npm/bare-os@3.9.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-os@3.9.3"
  ],
  "symbols": [
    "getProcessTitle"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "esm",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import fs from 'node:fs';
import path from 'node:path';
import os, { getCurrentProcessTitle, updateProcessTitle, loadBareOS } from '../index.js';

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

// 1. Verify getProcessTitle returns string representing current process title
const initialTitle = os.getProcessTitle();
assert.equal(typeof initialTitle, 'string', 'getProcessTitle must return a string');
assert.ok(initialTitle.length > 0, 'process title must be non-empty');

const helperTitle = getCurrentProcessTitle();
assert.equal(helperTitle, initialTitle, 'getCurrentProcessTitle must match getProcessTitle');

// 2. Verify setProcessTitle updates process title retrievable by getProcessTitle
const updated = updateProcessTitle('worker-custom-process');
assert.equal(updated, 'worker-custom-process', 'updateProcessTitle must return updated title');
assert.equal(os.getProcessTitle(), 'worker-custom-process', 'getProcessTitle must return updated title');

// 3. Verify setProcessTitle converts non-string titles via toString
os.setProcessTitle(12345);
assert.equal(os.getProcessTitle(), '12345', 'setProcessTitle must convert number to string');

// 4. Verify setProcessTitle throws Error when title exceeds 255 characters
const OSError = require('bare-os/errors');
const longTitle = 'a'.repeat(256);
assert.throws(
  () => os.setProcessTitle(longTitle),
  (err) => {
    assert.ok(err instanceof Error, 'Error must be an instance of Error');
    assert.ok(err instanceof OSError, 'Error must be an instance of OSError');
    assert.equal(err.name, 'OSError', 'Error name must be OSError');
    assert.equal(err.code, 'TITLE_OVERFLOW', 'Error code must be TITLE_OVERFLOW');
    return true;
  },
  'setProcessTitle must throw TITLE_OVERFLOW OSError when title length >= 256'
);

// 5. Verify bare-os exports getProcessTitle and setProcessTitle with corresponding TypeScript declarations and errors
const pkgPath = require.resolve('bare-os/package');
const pkgDir = path.dirname(pkgPath);
const indexDts = fs.readFileSync(path.join(pkgDir, 'index.d.ts'), 'utf8');
assert.ok(indexDts.includes('export function getProcessTitle(): string'), 'index.d.ts must declare getProcessTitle');
assert.ok(indexDts.includes('export function setProcessTitle(title: unknown): void'), 'index.d.ts must declare setProcessTitle');

console.log('All contract assertions passed.');