globalthis 1.0.4: implementation

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 globalthis.implementation in pkg:npm/globalthis@1.0.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/globalthis@1.0.4
Demonstrate these symbols/APIs:
  - globalthis.implementation

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:sha256:3731544660bc7c6119c03b3852333294b7c7fd429b2b51ff6b5e10150988b7ce","contract":["globalthis.implementation is exported on the default export of the globalthis package","globalthis.implementation resolves to the global environment object in Node.js","globalthis.implementation matches importing implementation.js directly","globalthis.implementation exposes standard ECMAScript global built-in constructors","globalthis.implementation matches the return value of invoking getGlobal"],"goal":"verify globalthis.implementation in pkg:npm/globalthis@1.0.4","kind":"HOW","packages":["pkg:npm/globalthis@1.0.4"],"schemaVersion":1,"symbols":["globalthis.implementation"]},"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/globalthis@1.0.4"],"schemaVersion":1,"subject":"pkg:npm/globalthis@1.0.4","symbols":["globalthis.implementation"],"verifierAdapter":"node-typescript@1"}

import getGlobal from 'globalthis';
import implementation from 'globalthis/implementation.js';

/**
 * Returns the implementation export from globalthis.
 * In Node.js, this is the global object.
 *
 * @returns {object} The implementation object
 */
export function getImplementation() {
  return getGlobal.implementation;
}

/**
 * Direct reference to globalthis.implementation.
 */
export const globalThisImplementation = getGlobal.implementation;

export { getGlobal, implementation };
export default getGlobal;

{
  "name": "sample-globalthis-implementation-verify",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-globalthis-implementation-verify",
      "version": "1.0.0",
      "dependencies": {
        "globalthis": "1.0.4"
      }
    },
    "node_modules/define-data-property": {
      "version": "1.1.4",
      "resolved": "https://registry.npmjs.org/define-data-property/-/define-data-property-1.1.4.tgz",
      "integrity": "sha512-rBMvIzlpA8v6E+SJZoo++HAYqsLrkg7MSfIinMPFhmkorw7X+dOXVJQs+QT69zGkzMyfDnIMN2Wid1+NbL3T+A==",
      "license": "MIT",
      "dependencies": {
        "es-define-property": "^1.0.0",
        "es-errors": "^1.3.0",
        "gopd": "^1.0.1"
      },
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/define-properties": {
      "version": "1.2.1",
      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.2.1.tgz",
      "integrity": "sha512-8QmQKqEASLd5nx0U1B1okLElbUuuttJ/AnYmRXbbbGDWh6uS208EjD4Xqq/I9wK7u0v6O08XhTWnt5XtEbR6Dg==",
      "license": "MIT",
      "dependencies": {
        "define-data-property": "^1.0.1",
        "has-property-descriptors": "^1.0.0",
        "object-keys": "^1.1.1"
      },
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/es-define-property": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/es-define-property/-/es-define-property-1.0.1.tgz",
      "integrity": "sha512-e3nRfgfUZ4rNGL232gUgX06QNyyez04KdjFrF+LTRoOXmrOgFKDg4BCdsjW8EnT69eqdYGmRpJwiPVYNrCaW3g==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      }
    },
    "node_modules/es-errors": {
      "version": "1.3.0",
      "resolved": "https://registry.npmjs.org/es-errors/-/es-errors-1.3.0.tgz",
      "integrity": "sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      }
    },
    "node_modules/globalthis": {
      "version": "1.0.4",
      "resolved": "https://registry.npmjs.org/globalthis/-/globalthis-1.0.4.tgz",
      "integrity": "sha512-DpLKbNU4WylpxJykQujfCcwYWiV/Jhm50Goo0wrVILAv5jOr9d+H+UR3PhSCD2rCCEIg0uc+G+muBTwD54JhDQ==",
      "license": "MIT",
      "dependencies": {
        "define-properties": "^1.2.1",
        "gopd": "^1.0.1"
      },
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/gopd": {
      "version": "1.2.0",
      "resolved": "https://registry.npmjs.org/gopd/-/gopd-1.2.0.tgz",
      "integrity": "sha512-ZUKRh6/kUFoAiTAtTYPZJ3hw9wNxx+BIBOijnlG9PnrJsCcSjs1wyyD6vJpaYtgnzDrKYRSqf3OO6Rfa93xsRg==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/has-property-descriptors": {
      "version": "1.0.2",
      "resolved": "https://registry.npmjs.org/has-property-descriptors/-/has-property-descriptors-1.0.2.tgz",
      "integrity": "sha512-55JNKuIW+vq4Ke1BjOTjM2YctQIvCT7GFzHwmfZPGo5wnrgkid0YQtnAleFSqumZm4az3n2BS+erby5ipJdgrg==",
      "license": "MIT",
      "dependencies": {
        "es-define-property": "^1.0.0"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/object-keys": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
      "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      }
    }
  }
}

{
  "name": "sample-globalthis-implementation-verify",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "globalthis": "1.0.4"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify globalthis.implementation in pkg:npm/globalthis@1.0.4",
  "kind": "HOW",
  "packages": [
    "pkg:npm/globalthis@1.0.4"
  ],
  "symbols": [
    "globalthis.implementation"
  ]
}

import assert from 'node:assert/strict';
import getGlobal, {
  getImplementation,
  globalThisImplementation,
  implementation
} from '../index.mjs';

// 1. globalthis.implementation is exported on the default export of the globalthis package
{
  assert.strictEqual(typeof getGlobal.implementation, 'object');
  assert.notStrictEqual(getGlobal.implementation, null);
  assert.strictEqual(typeof globalThisImplementation, 'object');
  assert.notStrictEqual(globalThisImplementation, null);
}

// 2. globalthis.implementation resolves to the global environment object in Node.js
{
  assert.strictEqual(getGlobal.implementation, global);
  assert.strictEqual(globalThisImplementation, global);
  assert.strictEqual(getImplementation(), global);
}

// 3. globalthis.implementation matches importing implementation.js directly
{
  assert.strictEqual(getGlobal.implementation, implementation);
  assert.strictEqual(globalThisImplementation, implementation);
  assert.strictEqual(getImplementation(), implementation);
}

// 4. globalthis.implementation exposes standard ECMAScript global built-in constructors
{
  assert.strictEqual(getGlobal.implementation.Object, Object);
  assert.strictEqual(getGlobal.implementation.Array, Array);
  assert.strictEqual(getGlobal.implementation.Function, Function);
  assert.strictEqual(getGlobal.implementation.Math, Math);
}

// 5. globalthis.implementation matches the return value of invoking getGlobal
{
  const directCall = getGlobal();
  assert.strictEqual(directCall, getGlobal.implementation);
  assert.strictEqual(directCall, globalThisImplementation);
}