globals 14.0.0: serviceworker

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 globals.serviceworker in pkg:npm/globals@14.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/globals@14.0.0
Demonstrate these symbols/APIs:
  - globals.serviceworker

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:c07b17e59bfc65b2d05d18894d84b5f44ec6f08df9dbdfbc3a18b2aed8c14353","contract":["globals.serviceworker is an object mapping ServiceWorker global identifiers to boolean writeability flags","globals.serviceworker defines core ServiceWorker scope identifiers as non-writable (false)","globals.serviceworker defines lifecycle and message event handlers as writable (true)","globals.serviceworker defines event interfaces such as FetchEvent and ExtendableEvent as non-writable (false)","all properties in globals.serviceworker map strictly to boolean values"],"goal":"verify globals.serviceworker in pkg:npm/globals@14.0.0","kind":"HOW","packages":["pkg:npm/globals@14.0.0"],"schemaVersion":1,"symbols":["globals.serviceworker"]},"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/globals@14.0.0"],"schemaVersion":1,"subject":"pkg:npm/globals@14.0.0","symbols":["globals.serviceworker"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-globals-serviceworker",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-globals-serviceworker",
      "version": "1.0.0",
      "dependencies": {
        "globals": "14.0.0"
      }
    },
    "node_modules/globals": {
      "version": "14.0.0",
      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
      "license": "MIT",
      "engines": {
        "node": ">=18"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    }
  }
}

{
  "name": "sample-globals-serviceworker",
  "version": "1.0.0",
  "private": true,
  "description": "verify globals.serviceworker in pkg:npm/globals@14.0.0",
  "type": "module",
  "main": "src/index.js",
  "dependencies": {
    "globals": "14.0.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify globals.serviceworker in pkg:npm/globals@14.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/globals@14.0.0"
  ],
  "symbols": [
    "globals.serviceworker"
  ]
}

import globals from 'globals';

/**
 * Return the globals.serviceworker dictionary.
 *
 * @returns {Record<string, boolean>} Object mapping ServiceWorker global identifiers to boolean writeability flags.
 */
export function getServiceWorkerGlobals() {
  return globals.serviceworker;
}

/**
 * Check whether a given identifier is present in globals.serviceworker.
 *
 * @param {string} identifier - The global identifier name to check.
 * @returns {boolean} True if the identifier is defined in globals.serviceworker.
 */
export function hasServiceWorkerGlobal(identifier) {
  return Object.prototype.hasOwnProperty.call(globals.serviceworker, identifier);
}

/**
 * Check whether an identifier in globals.serviceworker is defined as writable.
 *
 * @param {string} identifier - The global identifier name to inspect.
 * @returns {boolean} True if writable (value is true), false otherwise.
 */
export function isServiceWorkerGlobalWritable(identifier) {
  return globals.serviceworker[identifier] === true;
}

export { globals };

import assert from 'node:assert/strict';
import {
  globals,
  getServiceWorkerGlobals,
  hasServiceWorkerGlobal,
  isServiceWorkerGlobalWritable,
} from '../src/index.js';

// 1. globals.serviceworker is an object mapping ServiceWorker global identifiers to boolean writeability flags
assert.equal(typeof globals.serviceworker, 'object', 'globals.serviceworker must be an object');
assert.notEqual(globals.serviceworker, null, 'globals.serviceworker must not be null');
assert.ok(Object.keys(globals.serviceworker).length > 0, 'globals.serviceworker must contain identifier definitions');
assert.strictEqual(getServiceWorkerGlobals(), globals.serviceworker, 'getServiceWorkerGlobals must return globals.serviceworker');

// 2. globals.serviceworker defines core ServiceWorker scope identifiers as non-writable (false)
const coreScopeIdentifiers = [
  'ServiceWorkerGlobalScope',
  'clients',
  'registration',
  'skipWaiting',
  'caches',
  'importScripts',
  'self',
];
for (const id of coreScopeIdentifiers) {
  assert.strictEqual(hasServiceWorkerGlobal(id), true, `globals.serviceworker must define ${id}`);
  assert.strictEqual(globals.serviceworker[id], false, `${id} must be non-writable (false)`);
  assert.strictEqual(isServiceWorkerGlobalWritable(id), false, `isServiceWorkerGlobalWritable(${id}) must return false`);
}

// 3. globals.serviceworker defines lifecycle and message event handlers as writable (true)
const eventHandlers = [
  'oninstall',
  'onfetch',
  'onmessage',
  'onmessageerror',
];
for (const handler of eventHandlers) {
  assert.strictEqual(hasServiceWorkerGlobal(handler), true, `globals.serviceworker must define ${handler}`);
  assert.strictEqual(globals.serviceworker[handler], true, `${handler} must be writable (true)`);
  assert.strictEqual(isServiceWorkerGlobalWritable(handler), true, `isServiceWorkerGlobalWritable(${handler}) must return true`);
}

// 4. globals.serviceworker defines event interfaces such as FetchEvent and ExtendableEvent as non-writable (false)
const eventInterfaces = [
  'FetchEvent',
  'ExtendableEvent',
  'ExtendableMessageEvent',
];
for (const iface of eventInterfaces) {
  assert.strictEqual(hasServiceWorkerGlobal(iface), true, `globals.serviceworker must define ${iface}`);
  assert.strictEqual(globals.serviceworker[iface], false, `${iface} must be non-writable (false)`);
  assert.strictEqual(isServiceWorkerGlobalWritable(iface), false, `isServiceWorkerGlobalWritable(${iface}) must return false`);
}

// 5. all properties in globals.serviceworker map strictly to boolean values
for (const [key, value] of Object.entries(globals.serviceworker)) {
  assert.strictEqual(typeof value, 'boolean', `Property ${key} must map strictly to a boolean value`);
}

console.log('Contract passed: globals.serviceworker verified successfully.');