bare-os 3.9.3: setPriority

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 setPriority 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:
  - setPriority
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:a1bf910aad6f0f818475e604eaccf6a85f89ec5d5bd9d579714276f7cb434106","constraints":{"executionContext":"node"},"contract":["package manifest specifies Bare addon configuration, Bare engine requirement, and exports root and subpaths for bare-os@3.9.3","declares setPriority with single-argument priority and two-argument pid/priority overloads and getPriority in index.d.ts","declares priority constants map in lib/constants.d.ts","binding.c implements bare_os_set_priority via uv_os_setpriority and exports PRIORITY constants","setPriority defaults pid to 0 when called with single priority argument and forwards pid and priority to native binding","setPriority validates pid and priority arguments throwing TypeError when non-integer values are provided"],"goal":"verify setPriority in pkg:npm/bare-os@3.9.3","kind":"HOW","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"symbols":["setPriority"]},"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":["setPriority"],"verifierAdapter":"node-typescript@1"}

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

{
  "schemaVersion": 1,
  "goal": "verify setPriority in pkg:npm/bare-os@3.9.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-os@3.9.3"
  ],
  "symbols": [
    "setPriority"
  ],
  "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 Module from 'node:module';
import fs from 'node:fs';
import path from 'node:path';

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

// 1. Resolve bare-os package manifest and metadata
const pkgPath = require.resolve('bare-os/package');
const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf8'));
const pkgDir = path.dirname(pkgPath);

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 addon');
assert.equal(pkg.engines?.bare, '>=1.14.0', 'Package must specify Bare engine >=1.14.0');

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

// 2. Verify TypeScript declarations for setPriority, getPriority and priority constants
const indexDts = fs.readFileSync(path.join(pkgDir, 'index.d.ts'), 'utf8');
const constantsDts = fs.readFileSync(path.join(pkgDir, 'lib', 'constants.d.ts'), 'utf8');

assert.ok(indexDts.includes('export function setPriority(priority: number): void'), 'index.d.ts must declare setPriority(priority: number)');
assert.ok(indexDts.includes('export function setPriority(pid: number, priority: number): void'), 'index.d.ts must declare setPriority(pid: number, priority: number)');
assert.ok(indexDts.includes('export function getPriority(pid?: number): number'), 'index.d.ts must declare getPriority(pid?: number)');
assert.ok(constantsDts.includes('priority: Record<string, number>'), 'lib/constants.d.ts must declare priority record');

// 3. Verify C native addon source and build configuration
const bindingC = fs.readFileSync(path.join(pkgDir, 'binding.c'), 'utf8');
assert.ok(bindingC.includes('bare_os_set_priority'), 'binding.c must implement bare_os_set_priority');
assert.ok(bindingC.includes('uv_os_setpriority(pid, priority)'), 'binding.c must invoke uv_os_setpriority');
assert.ok(bindingC.includes('V("setPriority", bare_os_set_priority)'), 'binding.c must export setPriority function');
assert.ok(bindingC.includes('V(PRIORITY_LOW)'), 'binding.c must export PRIORITY_LOW');
assert.ok(bindingC.includes('V(PRIORITY_NORMAL)'), 'binding.c must export PRIORITY_NORMAL');
assert.ok(bindingC.includes('V(PRIORITY_HIGH)'), 'binding.c must export PRIORITY_HIGH');

// 4. Verify JS wrapper execution and argument validation with mocked binding
const calls = [];
const mockBinding = {
  setPriority(pid, priority) {
    calls.push({ pid, priority });
  },
  getPriority(pid) {
    return 0;
  },
  signals: {},
  errnos: {},
  priority: {
    PRIORITY_LOW: 19,
    PRIORITY_BELOW_NORMAL: 10,
    PRIORITY_NORMAL: 0,
    PRIORITY_ABOVE_NORMAL: -10,
    PRIORITY_HIGH: -15,
    PRIORITY_HIGHEST: -20
  }
};

const bindingPath = path.join(pkgDir, 'binding.js');
require.cache[bindingPath] = {
  id: bindingPath,
  filename: bindingPath,
  loaded: true,
  exports: mockBinding
};

const bareOs = require('bare-os');
assert.equal(typeof bareOs.setPriority, 'function', 'bare-os must export setPriority function');
assert.equal(typeof bareOs.getPriority, 'function', 'bare-os must export getPriority function');

// Test single argument overload: setPriority(priority) -> defaults pid to 0
calls.length = 0;
bareOs.setPriority(10);
assert.equal(calls.length, 1);
assert.deepEqual(calls[0], { pid: 0, priority: 10 }, 'Single argument setPriority must pass pid=0');

// Test two argument overload: setPriority(pid, priority)
calls.length = 0;
bareOs.setPriority(4567, -10);
assert.equal(calls.length, 1);
assert.deepEqual(calls[0], { pid: 4567, priority: -10 }, 'Two argument setPriority must pass provided pid and priority');

// Test constants.priority values
assert.equal(bareOs.constants.priority.PRIORITY_LOW, 19);
assert.equal(bareOs.constants.priority.PRIORITY_NORMAL, 0);
assert.equal(bareOs.constants.priority.PRIORITY_HIGH, -15);
assert.equal(bareOs.constants.priority.PRIORITY_HIGHEST, -20);

// Test argument validation
assert.throws(() => bareOs.setPriority('invalid'), {
  name: 'TypeError',
  message: 'Priority must be an integer. Received type string (invalid)'
}, 'setPriority must reject non-integer priority in single-argument form');

assert.throws(() => bareOs.setPriority('invalid_pid', 0), {
  name: 'TypeError',
  message: 'Process ID must be an integer. Received type string (invalid_pid)'
}, 'setPriority must reject non-integer pid in two-argument form');

assert.throws(() => bareOs.setPriority(1234, 'invalid_priority'), {
  name: 'TypeError',
  message: 'Priority must be an integer. Received type string (invalid_priority)'
}, 'setPriority must reject non-integer priority in two-argument form');

assert.throws(() => bareOs.setPriority(1.5), {
  name: 'TypeError',
  message: 'Priority must be an integer. Received type number (1.5)'
}, 'setPriority must reject float priority');

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