globalthis 1.0.4: shim

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.shim 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.shim

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:sha256:913f22f9ee173fbbf1db53c02972005d40a42fa7db45955ad703a52f47e44ba9","contract":["globalthis.shim is a function exported by the globalthis package","globalthis.shim returns the global object","globalthis.shim installs globalThis on the global object when called","globalthis.shim defines globalThis with configurable and writable property descriptor but non-enumerable","globalthis.shim is idempotent and returns the same global object on repeated invocations","globalthis default export getGlobal returns the polyfilled global object matching shim"],"goal":"verify globalthis.shim in pkg:npm/globalthis@1.0.4","kind":"HOW","packages":["pkg:npm/globalthis@1.0.4"],"schemaVersion":1,"symbols":["globalthis.shim"]},"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.shim"],"verifierAdapter":"node-typescript@1"}

import getGlobal from 'globalthis';

/**
 * Returns the global object polyfilled by globalthis.
 *
 * @returns {object} The global object
 */
export function getGlobalObject() {
  return getGlobal();
}

/**
 * Shims globalThis onto the global environment and returns the global object.
 *
 * @returns {object} The shimmed global object
 */
export function shimGlobalThis() {
  return getGlobal.shim();
}

/**
 * Direct reference to the shim function.
 */
export const shim = getGlobal.shim;

export { getGlobal };
export default getGlobal;

{
  "name": "sample-globalthis-shim-verify",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-globalthis-shim-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": {
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        "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",
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      "license": "MIT",
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        "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==",
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      "engines": {
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    },
    "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"
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    },
    "node_modules/has-property-descriptors": {
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      "license": "MIT",
      "dependencies": {
        "es-define-property": "^1.0.0"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/object-keys": {
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      "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-shim-verify",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "globalthis": "1.0.4"
  }
}

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

import assert from 'node:assert/strict';
import getGlobal, { shim, shimGlobalThis, getGlobalObject } from '../index.mjs';

// 1. globalthis.shim is a function exported by the globalthis package
{
  assert.strictEqual(typeof shim, 'function');
  assert.strictEqual(typeof getGlobal.shim, 'function');
  assert.strictEqual(typeof shimGlobalThis, 'function');
}

// 2. globalthis.shim returns the global object
{
  const result = shim();
  assert.strictEqual(typeof result, 'object');
  assert.ok(result !== null);
  assert.strictEqual(result.Array, Array);
  assert.strictEqual(result.Object, Object);
  assert.strictEqual(result.Math, Math);
}

// 3. globalthis.shim installs globalThis on the global object when called
{
  const result = shim();
  assert.strictEqual(result.globalThis, result);
  assert.strictEqual(globalThis, result);
}

// 4. globalthis.shim defines globalThis with configurable and writable property descriptor but non-enumerable
{
  const target = shim();
  const desc = Object.getOwnPropertyDescriptor(target, 'globalThis');
  assert.ok(desc, 'descriptor should exist');
  assert.strictEqual(desc.configurable, true);
  assert.strictEqual(desc.writable, true);
  assert.strictEqual(desc.enumerable, false);
}

// 5. globalthis.shim is idempotent and returns the same global object on repeated invocations
{
  const first = shim();
  const second = shim();
  const third = shimGlobalThis();
  assert.strictEqual(first, second);
  assert.strictEqual(second, third);
  assert.strictEqual(globalThis, first);
}

// 6. globalthis default export getGlobal returns the polyfilled global object matching shim
{
  const polyfill = getGlobal();
  const fromShim = shim();
  const fromHelper = getGlobalObject();
  assert.strictEqual(polyfill, fromShim);
  assert.strictEqual(polyfill, fromHelper);
  assert.strictEqual(polyfill.globalThis, polyfill);
}