CodeSampleX

Sample

babel-plugin-polyfill-corejs3 0.11.1: default

Verified sample for npm babel-plugin-polyfill-corejs3 0.11.1: default. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:a0726720622e8c5e442e0c8ad88f1ef36097847838d54a617660e80b4653093d

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-05

Case

HOW
Goal
verify default in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Packages
Symbols
  • default
Environment
node 22.23.2
Created
2026-09-05T02:04:33Z

Contract

  1. The default export is a plugin factory function requiring Babel API and options
  2. The default export asserts Babel version compatibility with range ^7.0.0 || ^8.0.0-alpha.0
  3. The default export throws an error when options are omitted
  4. The default export rejects invalid polyfill methods and requires entry-global, usage-global, or usage-pure
  5. The default export in usage-global mode returns an inject-polyfills plugin object with AST visitor and lifecycle hooks
  6. The default export in usage-pure mode configures AST visitors for pure polyfill replacement
  7. The default export in entry-global mode configures AST visitors for entry import expansion
  8. The default export validates options and rejects invalid versions or unmatched include patterns

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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 default in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Demonstrate these symbols/APIs:
  - default

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.
csx.json
{"case":{"caseId":"case:sha256:93322becbdbf4e0513cbda55cb409f883fd8a3a6b72a0a88cbc2ebc8d77d766f","contract":["The default export is a plugin factory function requiring Babel API and options","The default export asserts Babel version compatibility with range ^7.0.0 || ^8.0.0-alpha.0","The default export throws an error when options are omitted","The default export rejects invalid polyfill methods and requires entry-global, usage-global, or usage-pure","The default export in usage-global mode returns an inject-polyfills plugin object with AST visitor and lifecycle hooks","The default export in usage-pure mode configures AST visitors for pure polyfill replacement","The default export in entry-global mode configures AST visitors for entry import expansion","The default export validates options and rejects invalid versions or unmatched include patterns"],"goal":"verify default in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1","kind":"HOW","packages":["pkg:npm/babel-plugin-polyfill-corejs3@0.11.1"],"schemaVersion":1,"symbols":["default"]},"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/babel-plugin-polyfill-corejs3@0.11.1"],"schemaVersion":1,"subject":"pkg:npm/babel-plugin-polyfill-corejs3@0.11.1","symbols":["default"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-plugin-polyfill-corejs3",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "babel-plugin-polyfill-corejs3": "0.11.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify default in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/babel-plugin-polyfill-corejs3@0.11.1"
  ],
  "symbols": [
    "default"
  ]
}
src/index.mjs
import polyfillCorejs3Plugin from 'babel-plugin-polyfill-corejs3';

export const SUPPORTED_METHODS = Object.freeze([
  'entry-global',
  'usage-global',
  'usage-pure'
]);

/**
 * Creates a mock Babel API object compatible with Babel 7/8 plugin requirements.
 * @param {object} [overrides] - Custom overrides for Babel API methods.
 * @returns {object} Mock Babel API.
 */
export function createMockBabelApi(overrides = {}) {
  return {
    version: '7.26.0',
    assertVersion: (range) => true,
    targets: () => ({ chrome: '100' }),
    caller: (cb) => cb({ name: 'babel-sample-runner' }),
    traverse: {
      visitors: {
        merge: (visitors) => Object.assign({}, ...visitors)
      }
    },
    ...overrides
  };
}

/**
 * Validates that the specified polyfill injection method is supported.
 * @param {string} method - Method name.
 * @returns {boolean} True if supported, false otherwise.
 */
export function isValidPolyfillMethod(method) {
  return SUPPORTED_METHODS.includes(method);
}

/**
 * Obtains the plugin function from the package default export.
 * @returns {Function} Babel plugin factory function.
 */
export function getPlugin() {
  return polyfillCorejs3Plugin.default || polyfillCorejs3Plugin;
}

/**
 * Instantiates the babel-plugin-polyfill-corejs3 plugin instance using its default export.
 * @param {object} [api] - Babel API or mock object.
 * @param {object} [options] - Plugin configuration options.
 * @returns {object} The plugin instance with name, visitor, and lifecycle hooks.
 */
export function createPolyfillCorejs3Plugin(api, options = { method: 'usage-global' }) {
  const plugin = getPlugin();
  const babelApi = api || createMockBabelApi();
  return plugin(babelApi, options);
}
test/contract.mjs
import assert from 'node:assert/strict';
import {
  SUPPORTED_METHODS,
  createMockBabelApi,
  isValidPolyfillMethod,
  getPlugin,
  createPolyfillCorejs3Plugin
} from '../src/index.mjs';

const plugin = getPlugin();

// 1. The default export is a plugin factory function requiring Babel API and options
assert.equal(typeof plugin, 'function', 'Plugin default export must be a function');

// 2. The default export asserts Babel version compatibility with range ^7.0.0 || ^8.0.0-alpha.0
let verifiedRange = null;
const apiWithTracker = createMockBabelApi({
  assertVersion(range) {
    verifiedRange = range;
  }
});
plugin(apiWithTracker, { method: 'usage-global' });
assert.equal(verifiedRange, '^7.0.0 || ^8.0.0-alpha.0', 'Plugin must assert compatibility with Babel 7 or 8-alpha');

// 3. The default export throws an error when options are omitted
assert.throws(
  () => plugin(createMockBabelApi(), {}),
  { message: /This plugin requires options/ },
  'Plugin must require options'
);

// 4. The default export rejects invalid polyfill methods and requires entry-global, usage-global, or usage-pure
assert.throws(
  () => plugin(createMockBabelApi(), { method: 123 }),
  { message: /.method must be a string/ },
  'Plugin must reject non-string method'
);
assert.throws(
  () => plugin(createMockBabelApi(), { method: 'invalid-method' }),
  { message: /.method must be one of "entry-global", "usage-global" or "usage-pure"/ },
  'Plugin must reject invalid method string'
);
assert.deepEqual(SUPPORTED_METHODS, ['entry-global', 'usage-global', 'usage-pure']);
assert.equal(isValidPolyfillMethod('usage-global'), true);
assert.equal(isValidPolyfillMethod('usage-pure'), true);
assert.equal(isValidPolyfillMethod('entry-global'), true);
assert.equal(isValidPolyfillMethod('other'), false);

// 5. The default export in usage-global mode returns an inject-polyfills plugin object with AST visitor and lifecycle hooks
const globalPlugin = createPolyfillCorejs3Plugin(createMockBabelApi(), { method: 'usage-global' });
assert.equal(typeof globalPlugin, 'object', 'Plugin instance must be an object');
assert.equal(globalPlugin.name, 'inject-polyfills', 'Plugin name must be "inject-polyfills"');
assert.equal(typeof globalPlugin.pre, 'function', 'Plugin must provide pre traversal hook');
assert.equal(typeof globalPlugin.post, 'function', 'Plugin must provide post traversal hook');
assert.equal(typeof globalPlugin.visitor, 'object', 'Plugin must provide AST visitor');
assert.ok('ReferencedIdentifier' in globalPlugin.visitor, 'usage-global visitor must handle ReferencedIdentifier');
assert.ok('MemberExpression|OptionalMemberExpression' in globalPlugin.visitor, 'usage-global visitor must handle MemberExpression');
assert.ok('ForOfStatement|ArrayPattern' in globalPlugin.visitor, 'usage-global visitor must handle iteration constructs');

// 6. The default export in usage-pure mode configures AST visitors for pure polyfill replacement
const purePlugin = createPolyfillCorejs3Plugin(createMockBabelApi(), { method: 'usage-pure' });
assert.equal(purePlugin.name, 'inject-polyfills', 'usage-pure plugin name must be "inject-polyfills"');
assert.equal(typeof purePlugin.visitor, 'object', 'usage-pure plugin must provide AST visitor');
assert.ok('ReferencedIdentifier' in purePlugin.visitor, 'usage-pure visitor must handle ReferencedIdentifier');
assert.ok('MemberExpression|OptionalMemberExpression' in purePlugin.visitor, 'usage-pure visitor must handle MemberExpression');
assert.ok(!('ForOfStatement|ArrayPattern' in purePlugin.visitor), 'usage-pure does not inject syntax polyfills');

// 7. The default export in entry-global mode configures AST visitors for entry import expansion
const entryPlugin = createPolyfillCorejs3Plugin(createMockBabelApi(), { method: 'entry-global' });
assert.equal(entryPlugin.name, 'inject-polyfills', 'entry-global plugin name must be "inject-polyfills"');
assert.equal(typeof entryPlugin.visitor, 'object', 'entry-global plugin must provide AST visitor');
assert.ok('ImportDeclaration' in entryPlugin.visitor, 'entry-global visitor must handle ImportDeclaration');
assert.ok('Program' in entryPlugin.visitor, 'entry-global visitor must handle Program');

// 8. The default export validates options and rejects invalid versions or unmatched include patterns
assert.throws(
  () => plugin(createMockBabelApi(), { method: 'usage-global', version: 'invalid-semver' }),
  { message: /Invalid version: invalid-semver/ },
  'Plugin must reject invalid version format'
);
assert.throws(
  () => plugin(createMockBabelApi(), { method: 'usage-global', include: ['non-existent-polyfill'] }),
  { message: /The following "include" patterns didn't match any polyfill/ },
  'Plugin must reject non-existent include pattern'
);
assert.throws(
  () => plugin(createMockBabelApi(), {
    method: 'usage-global',
    include: ['es.array.includes'],
    exclude: ['es.array.includes']
  }),
  { message: /The following polyfills were matched both by "include" and "exclude" patterns/ },
  'Plugin must reject conflicting include and exclude patterns'
);

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

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