std-env 4.2.0: nodeMajorVersion

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 std-env.nodeMajorVersion in pkg:npm/std-env@4.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/std-env@4.2.0
Demonstrate these symbols/APIs:
  - std-env.nodeMajorVersion

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:sha256:1463f6e5b80f1ce6ad1c84fe3cb39957400cf99a1d0272d6804b0e7d4ab7f102","contract":["nodeMajorVersion exports a number in Node.js execution environment","nodeMajorVersion matches the parsed major integer from process.versions.node","nodeMajorVersion matches the parsed integer of nodeVersion","nodeMajorVersion parses correctly from semantic version string","nodeMajorVersion strips leading v prefix before extracting major version","nodeMajorVersion evaluates to null when process.versions.node is absent","nodeMajorVersion evaluates to null when process.versions is absent"],"goal":"verify std-env.nodeMajorVersion in pkg:npm/std-env@4.2.0","kind":"HOW","packages":["pkg:npm/std-env@4.2.0"],"schemaVersion":1,"symbols":["std-env.nodeMajorVersion"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","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/std-env@4.2.0"],"schemaVersion":1,"subject":"pkg:npm/std-env@4.2.0","symbols":["std-env.nodeMajorVersion"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-std-env",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-std-env",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "std-env": "4.2.0"
      }
    },
    "node_modules/std-env": {
      "version": "4.2.0",
      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.2.0.tgz",
      "integrity": "sha512-oCUKSupKTHX53EyjDtuZQ64pjLJ6yYCtpmEw0goYxtjG9KpbRe8KAsl2tBUGU9DyMcJ0RwJ8GqJAFzMXcXW1Rw==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-std-env",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "std-env": "4.2.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify std-env.nodeMajorVersion in pkg:npm/std-env@4.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/std-env@4.2.0"
  ],
  "symbols": [
    "std-env.nodeMajorVersion"
  ]
}

import assert from 'node:assert/strict';
import { nodeMajorVersion, nodeVersion } from 'std-env';

// 1. nodeMajorVersion exports a number in Node.js execution environment
assert.strictEqual(typeof nodeMajorVersion, 'number', 'nodeMajorVersion must export a number in Node.js');
assert.ok(!Number.isNaN(nodeMajorVersion), 'nodeMajorVersion must not be NaN');

// 2. nodeMajorVersion matches the parsed major integer from process.versions.node
const expectedMajor = Number(process.versions.node.split('.')[0]);
assert.strictEqual(nodeMajorVersion, expectedMajor, 'nodeMajorVersion must match the major version of process.versions.node');

// 3. nodeMajorVersion matches the parsed integer of nodeVersion
assert.strictEqual(typeof nodeVersion, 'string', 'nodeVersion must be a string');
assert.strictEqual(nodeMajorVersion, Number(nodeVersion.split('.')[0]), 'nodeMajorVersion must match major version of nodeVersion');

const stdEnvUrl = import.meta.resolve('std-env');
const originalVersions = process.versions;
const originalNodeVersion = process.versions?.node;

try {
  // 4. nodeMajorVersion parses correctly from semantic version string
  Object.defineProperty(process.versions, 'node', { value: '20.11.0', configurable: true });
  const mod1 = await import(`${stdEnvUrl}?case=v20`);
  assert.strictEqual(mod1.nodeMajorVersion, 20, 'nodeMajorVersion should parse 20 from 20.11.0');

  // 5. nodeMajorVersion strips leading v prefix before extracting major version
  Object.defineProperty(process.versions, 'node', { value: 'v18.19.1', configurable: true });
  const mod2 = await import(`${stdEnvUrl}?case=v18-prefix`);
  assert.strictEqual(mod2.nodeMajorVersion, 18, 'nodeMajorVersion should parse 18 from v18.19.1');

  // 6. nodeMajorVersion evaluates to null when process.versions.node is absent
  Object.defineProperty(process.versions, 'node', { value: undefined, configurable: true });
  const mod3 = await import(`${stdEnvUrl}?case=no-node-version`);
  assert.strictEqual(mod3.nodeMajorVersion, null, 'nodeMajorVersion should be null when process.versions.node is absent');

  // 7. nodeMajorVersion evaluates to null when process.versions is absent
  Object.defineProperty(process, 'versions', { value: undefined, configurable: true });
  const mod4 = await import(`${stdEnvUrl}?case=no-process-versions`);
  assert.strictEqual(mod4.nodeMajorVersion, null, 'nodeMajorVersion should be null when process.versions is absent');
} finally {
  if (originalVersions) {
    Object.defineProperty(process, 'versions', { value: originalVersions, configurable: true });
    Object.defineProperty(process.versions, 'node', { value: originalNodeVersion, configurable: true });
  }
}

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