std-env 4.2.0: isCI

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.isCI 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.isCI

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:d6e01eca3f181eb02c56100464de6a1b15f3e873e968c903c80341487988351c","contract":["isCI exports a boolean indicating whether the execution context is in continuous integration","isCI evaluates to false when CI and CI provider environment variables are absent","isCI evaluates to true when process.env.CI is set","isCI evaluates to true when CI provider variable GITHUB_ACTIONS is set","isCI evaluates to true when CI provider variable GITLAB_CI is set","isCI evaluates to true when CI provider variable CIRCLECI is set","isCI evaluates to false when non-CI provider configuration is present without CI"],"goal":"verify std-env.isCI in pkg:npm/std-env@4.2.0","kind":"HOW","packages":["pkg:npm/std-env@4.2.0"],"schemaVersion":1,"symbols":["std-env.isCI"]},"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.isCI"],"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.isCI in pkg:npm/std-env@4.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/std-env@4.2.0"
  ],
  "symbols": [
    "std-env.isCI"
  ]
}

import assert from 'node:assert/strict';
import { isCI } from 'std-env';

// 1. isCI exports a boolean indicating whether the execution context is in continuous integration
assert.strictEqual(typeof isCI, 'boolean', 'isCI must export a boolean value');

const stdEnvUrl = import.meta.resolve('std-env');

function clearKnownEnv() {
  delete process.env.CI;
  delete process.env.GITHUB_ACTIONS;
  delete process.env.GITLAB_CI;
  delete process.env.CIRCLECI;
  delete process.env.TRAVIS;
  delete process.env.VERCEL;
  delete process.env.VERCEL_ENV;
}

// 2. isCI evaluates to false when CI and CI provider environment variables are absent
{
  clearKnownEnv();
  const mod = await import(`${stdEnvUrl}?case=no-ci`);
  assert.strictEqual(mod.isCI, false, 'isCI must evaluate to false when no CI variables are set');
}

// 3. isCI evaluates to true when process.env.CI is set
{
  clearKnownEnv();
  process.env.CI = 'true';
  const mod = await import(`${stdEnvUrl}?case=ci-true`);
  assert.strictEqual(mod.isCI, true, 'isCI must evaluate to true when process.env.CI is set');
}

// 4. isCI evaluates to true when CI provider variable GITHUB_ACTIONS is set
{
  clearKnownEnv();
  process.env.GITHUB_ACTIONS = 'true';
  const mod = await import(`${stdEnvUrl}?case=github-actions`);
  assert.strictEqual(mod.isCI, true, 'isCI must evaluate to true when GITHUB_ACTIONS is set');
}

// 5. isCI evaluates to true when CI provider variable GITLAB_CI is set
{
  clearKnownEnv();
  process.env.GITLAB_CI = 'true';
  const mod = await import(`${stdEnvUrl}?case=gitlab-ci`);
  assert.strictEqual(mod.isCI, true, 'isCI must evaluate to true when GITLAB_CI is set');
}

// 6. isCI evaluates to true when CI provider variable CIRCLECI is set
{
  clearKnownEnv();
  process.env.CIRCLECI = 'true';
  const mod = await import(`${stdEnvUrl}?case=circleci`);
  assert.strictEqual(mod.isCI, true, 'isCI must evaluate to true when CIRCLECI is set');
}

// 7. isCI evaluates to false when non-CI provider configuration is present without CI
{
  clearKnownEnv();
  process.env.VERCEL = '1';
  process.env.VERCEL_ENV = 'preview';
  const mod = await import(`${stdEnvUrl}?case=vercel-preview`);
  assert.strictEqual(mod.isCI, false, 'isCI must evaluate to false when non-CI provider is present');
}

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