std-env 4.2.0: platform

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.platform 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.platform

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:sha256:6fc4c14a42f5ac4b231a42a44c7957711658136e131202d34a499d5268c04987","contract":["std-env.platform exports a string representing the operating system platform","std-env.platform matches process.platform in Node.js runtime environments","std-env.platform aligns with boolean platform flags isLinux, isWindows, and isMacOS","std-env.platform evaluates to linux and sets isLinux to true in the current Linux test environment","std-env.platform ensures mutually exclusive OS identification among Linux, Windows, and macOS"],"goal":"verify std-env.platform in pkg:npm/std-env@4.2.0","kind":"HOW","packages":["pkg:npm/std-env@4.2.0"],"schemaVersion":1,"symbols":["std-env.platform"]},"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/std-env@4.2.0"],"schemaVersion":1,"subject":"pkg:npm/std-env@4.2.0","symbols":["std-env.platform"],"verifierAdapter":"node-typescript@1"}

import { platform, isLinux, isWindows, isMacOS } from 'std-env';

export { platform, isLinux, isWindows, isMacOS };
export default platform;

{
  "name": "sample-std-env-platform",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-std-env-platform",
      "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-platform",
  "version": "1.0.0",
  "type": "module",
  "main": "index.mjs",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "std-env": "4.2.0"
  }
}

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

import assert from 'node:assert/strict';
import * as stdEnv from 'std-env';
import { platform, isLinux, isWindows, isMacOS } from '../index.mjs';

// 1. std-env.platform exports a string representing the operating system platform
{
  assert.equal(typeof platform, 'string', 'platform must be a string');
  assert.equal(typeof stdEnv.platform, 'string', 'std-env package platform must be a string');
}

// 2. std-env.platform matches process.platform in Node.js runtime environments
{
  const expectedPlatform = typeof process !== 'undefined' && process.platform ? process.platform : '';
  assert.equal(platform, expectedPlatform, 'platform must match process.platform');
  assert.equal(stdEnv.platform, expectedPlatform, 'stdEnv.platform must match process.platform');
}

// 3. std-env.platform aligns with boolean platform flags isLinux, isWindows, and isMacOS
{
  assert.equal(typeof isLinux, 'boolean', 'isLinux must be a boolean');
  assert.equal(typeof isWindows, 'boolean', 'isWindows must be a boolean');
  assert.equal(typeof isMacOS, 'boolean', 'isMacOS must be a boolean');

  assert.equal(isLinux, /^linux/i.test(platform), 'isLinux must match /^linux/i regex test on platform');
  assert.equal(isWindows, /^win/i.test(platform), 'isWindows must match /^win/i regex test on platform');
  assert.equal(isMacOS, /^darwin/i.test(platform), 'isMacOS must match /^darwin/i regex test on platform');

  assert.equal(stdEnv.isLinux, isLinux, 'stdEnv.isLinux must match exported isLinux');
  assert.equal(stdEnv.isWindows, isWindows, 'stdEnv.isWindows must match exported isWindows');
  assert.equal(stdEnv.isMacOS, isMacOS, 'stdEnv.isMacOS must match exported isMacOS');
}

// 4. std-env.platform evaluates to linux and sets isLinux to true in the current Linux test environment
{
  assert.equal(platform, 'linux', 'platform must evaluate to "linux" in Linux environment');
  assert.equal(isLinux, true, 'isLinux must be true in Linux environment');
  assert.equal(isWindows, false, 'isWindows must be false in Linux environment');
  assert.equal(isMacOS, false, 'isMacOS must be false in Linux environment');
}

// 5. std-env.platform ensures mutually exclusive OS identification among Linux, Windows, and macOS
{
  const flags = [isLinux, isWindows, isMacOS].filter(Boolean);
  assert.ok(flags.length <= 1, 'At most one platform flag should be true');
}

console.log('All std-env.platform contract assertions passed successfully.');