std-env 4.2.0: runtime

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.runtime 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.runtime

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:b73984e1c7ad41373bd7c8177cb3776b42ade16dbb7a0c108cfa8a8ef92e8d54","contract":["runtime evaluates to a string identifying the current JavaScript runtime environment","runtime returns node when executed in a standard Node.js environment","runtimeInfo returns an object containing name property matching runtime","runtime aligns with isNode and does not falsely identify non-Node runtimes","runtime detection priority identifies explicit runtimes or defaults to empty string when unknown"],"goal":"verify std-env.runtime in pkg:npm/std-env@4.2.0","kind":"HOW","packages":["pkg:npm/std-env@4.2.0"],"schemaVersion":1,"symbols":["std-env.runtime"]},"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.runtime"],"verifierAdapter":"node-typescript@1"}

import { runtime, runtimeInfo, isNode } from 'std-env';

export { runtime, runtimeInfo, isNode };
export default runtime;

{
  "name": "sample-std-env-runtime",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-std-env-runtime",
      "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-runtime",
  "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.runtime in pkg:npm/std-env@4.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/std-env@4.2.0"
  ],
  "symbols": [
    "std-env.runtime"
  ]
}

import assert from 'node:assert/strict';
import * as stdEnv from 'std-env';
import { runtime, runtimeInfo, isNode } from '../index.mjs';

// 1. runtime evaluates to a string identifying the current JavaScript runtime environment
{
  assert.equal(typeof runtime, 'string', 'runtime must be a string');
  assert.equal(typeof stdEnv.runtime, 'string', 'stdEnv.runtime must be a string');
}

// 2. runtime returns node when executed in a standard Node.js environment
{
  assert.equal(runtime, 'node', 'runtime must evaluate to "node" in standard Node.js');
  assert.equal(stdEnv.runtime, 'node', 'stdEnv.runtime must evaluate to "node" in standard Node.js');
}

// 3. runtimeInfo returns an object containing name property matching runtime
{
  assert.equal(typeof runtimeInfo, 'object', 'runtimeInfo must be an object');
  assert.notEqual(runtimeInfo, null, 'runtimeInfo must not be null');
  assert.equal(runtimeInfo.name, 'node', 'runtimeInfo.name must be "node"');
  assert.equal(runtimeInfo.name, runtime, 'runtimeInfo.name must match runtime constant');
  assert.equal(stdEnv.runtimeInfo.name, stdEnv.runtime, 'stdEnv.runtimeInfo.name must match stdEnv.runtime');
}

// 4. runtime aligns with isNode and does not falsely identify non-Node runtimes
{
  assert.equal(isNode, true, 'isNode must be true in Node.js');
  assert.equal(runtime === 'node', isNode, 'runtime === "node" must align with isNode in standard Node.js');
  assert.notEqual(runtime, 'bun', 'runtime must not be bun');
  assert.notEqual(runtime, 'deno', 'runtime must not be deno');
  assert.notEqual(runtime, 'workerd', 'runtime must not be workerd');
  assert.notEqual(runtime, 'netlify', 'runtime must not be netlify');
  assert.notEqual(runtime, 'edge-light', 'runtime must not be edge-light');
  assert.notEqual(runtime, 'fastly', 'runtime must not be fastly');
}

// 5. runtime detection priority identifies explicit runtimes or defaults to empty string when unknown
{
  const knownRuntimes = new Set([
    'node',
    'bun',
    'deno',
    'workerd',
    'netlify',
    'edge-light',
    'fastly',
    ''
  ]);
  assert.ok(knownRuntimes.has(runtime), `runtime "${runtime}" must be one of known runtimes or empty string`);
}

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