globalthis 1.0.4: getPolyfill

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.getPolyfill 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.getPolyfill

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:sha256:86f50528dbbce5029dccb2c904dfe058fcbd0283ea678d5b8f1c7e275f4b5cd4","contract":["globalthis.getPolyfill returns a function conforming to the es-shim specification","globalthis.getPolyfill returns the runtime global object containing standard ECMAScript globals","globalthis.getPolyfill returns the identical global reference across multiple calls","globalthis.getPolyfill resolves to globalThis in modern ECMAScript environments","globalthis/polyfill subpath exports the identical getPolyfill implementation function"],"goal":"verify globalthis.getPolyfill in pkg:npm/globalthis@1.0.4","kind":"HOW","packages":["pkg:npm/globalthis@1.0.4"],"schemaVersion":1,"symbols":["globalthis.getPolyfill"]},"contractCommand":["node","test/contract.cjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","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.getPolyfill"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-globalthis-getpolyfill",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-globalthis-getpolyfill",
      "version": "1.0.0",
      "license": "MIT-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-getpolyfill",
  "version": "1.0.0",
  "private": true,
  "description": "verify globalthis.getPolyfill in pkg:npm/globalthis@1.0.4",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "dependencies": {
    "globalthis": "1.0.4"
  },
  "license": "MIT-0"
}

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

'use strict';

const globalThisPkg = require('globalthis');

/**
 * Returns the getPolyfill implementation function from the globalthis package.
 * @returns {Function}
 */
function getPolyfillFunction() {
  return globalThisPkg.getPolyfill;
}

/**
 * Invokes getPolyfill to resolve and return the environment's global object.
 * @returns {object} The resolved global object.
 */
function resolveGlobalObject() {
  const polyfillFn = globalThisPkg.getPolyfill();
  return polyfillFn;
}

/**
 * Checks whether getPolyfill returns the native globalThis in current environment.
 * @returns {boolean} True if polyfill matches native globalThis.
 */
function isNativeGlobalThis() {
  return globalThisPkg.getPolyfill() === globalThis;
}

/**
 * Retrieves a property from the global object resolved via getPolyfill.
 * @param {string} key
 * @returns {*}
 */
function getGlobalProperty(key) {
  const globalObj = globalThisPkg.getPolyfill();
  return globalObj[key];
}

module.exports = {
  getPolyfillFunction,
  resolveGlobalObject,
  isNativeGlobalThis,
  getGlobalProperty,
  globalThisPkg
};

'use strict';

const assert = require('node:assert/strict');
const globalThisPkg = require('globalthis');
const subpathPolyfill = require('globalthis/polyfill');
const {
  getPolyfillFunction,
  resolveGlobalObject,
  isNativeGlobalThis,
  getGlobalProperty
} = require('../src/index.js');

async function testContract() {
  // 1. globalthis.getPolyfill returns a function conforming to the es-shim specification
  assert.equal(typeof globalThisPkg.getPolyfill, 'function', 'getPolyfill must be a function');
  assert.equal(typeof getPolyfillFunction(), 'function', 'helper must return getPolyfill function');
  assert.strictEqual(getPolyfillFunction(), globalThisPkg.getPolyfill, 'helper getPolyfill matches package export');

  // 2. globalthis.getPolyfill returns the runtime global object containing standard ECMAScript globals
  const resolved = globalThisPkg.getPolyfill();
  assert.equal(typeof resolved, 'object', 'getPolyfill result must be an object');
  assert.notEqual(resolved, null, 'getPolyfill result must not be null');
  assert.strictEqual(resolved.Array, Array, 'global object must contain Array');
  assert.strictEqual(resolved.Object, Object, 'global object must contain Object');
  assert.strictEqual(resolved.Math, Math, 'global object must contain Math');
  assert.strictEqual(resolved.JSON, JSON, 'global object must contain JSON');
  assert.strictEqual(resolved.Promise, Promise, 'global object must contain Promise');

  // 3. globalthis.getPolyfill returns the identical global reference across multiple calls
  const secondCall = globalThisPkg.getPolyfill();
  assert.strictEqual(secondCall, resolved, 'repeated calls to getPolyfill must return the identical global reference');
  assert.strictEqual(resolveGlobalObject(), resolved, 'helper resolveGlobalObject must return the identical global reference');

  // 4. globalthis.getPolyfill resolves to globalThis in modern ECMAScript environments
  assert.strictEqual(resolved, globalThis, 'getPolyfill must resolve to globalThis');
  assert.strictEqual(isNativeGlobalThis(), true, 'isNativeGlobalThis helper must report true');
  assert.strictEqual(getGlobalProperty('Math'), Math, 'getGlobalProperty must access global properties correctly');

  // 5. globalthis/polyfill subpath exports the identical getPolyfill implementation function
  assert.strictEqual(typeof subpathPolyfill, 'function', 'subpath export must be a function');
  assert.strictEqual(subpathPolyfill, globalThisPkg.getPolyfill, 'subpath export must match globalthis.getPolyfill');
  assert.strictEqual(subpathPolyfill(), resolved, 'calling subpath export must return the same global reference');

  console.log('Contract assertions verified successfully.');
}

testContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});