CodeSampleX

Sample

babel-plugin-polyfill-corejs3 0.11.1

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

sha256:b4e8c39cf0f204193946496f29c5b2456223736b32fbcdc5f917a2bcbc67cb16

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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…		 2026-09-04

Case

HOW
Goal
verify pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Packages
Created
2026-09-04T23:21:39Z

Contract

  1. Target core-js version specification filters modern API polyfills according to release availability
  2. Plugin validates version configuration string and rejects invalid format with descriptive error
  3. Async function declarations in usage-global mode trigger automatic injection of Promise dependencies
  4. Array spread elements trigger common iterator polyfills while object spread elements do not
  5. Delegated yield expressions in generator functions automatically trigger common iterator polyfills
  6. Array pattern destructuring triggers iterator polyfills for iterable unpacking
  7. Usage-pure mode rewrites Symbol.iterator in binary expressions into pure is-iterable helper invocations

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 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

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
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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 pkg:npm/babel-plugin-polyfill-corejs3@0.11.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/babel-plugin-polyfill-corejs3@0.11.1"
  ]
}
src/index.mjs
import * as babel from '@babel/core';
import polyfillCorejs3Plugin from 'babel-plugin-polyfill-corejs3';

const babelCore = babel.default || babel;
export const plugin = polyfillCorejs3Plugin.default || polyfillCorejs3Plugin;

/**
 * Transforms JavaScript source code using @babel/core and babel-plugin-polyfill-corejs3.
 * @param {string} code - Source code to transform.
 * @param {object} pluginOptions - Configuration options passed to babel-plugin-polyfill-corejs3.
 * @param {object} [babelOptions] - Additional options passed to Babel transformSync.
 * @returns {string} Transformed JavaScript code.
 */
export function transformWithPlugin(code, pluginOptions = {}, babelOptions = {}) {
  const result = babelCore.transformSync(code, {
    configFile: false,
    babelrc: false,
    plugins: [[plugin, pluginOptions]],
    ...babelOptions
  });
  return result ? result.code : '';
}

/**
 * Transforms code in usage-global mode with customizable core-js version and target environments.
 * @param {string} code - Source code to transform.
 * @param {object} [options] - Additional plugin options (version, targets, proposals, etc.).
 * @returns {string} Transformed JavaScript code.
 */
export function transformUsageGlobalWithOptions(code, options = {}) {
  const { version = '3.20', targets = { ie: '11' }, ...rest } = options;
  return transformWithPlugin(code, {
    method: 'usage-global',
    version,
    targets,
    ...rest
  });
}

/**
 * Transforms code in usage-pure mode with customizable options.
 * @param {string} code - Source code to transform.
 * @param {object} [options] - Additional plugin options.
 * @returns {string} Transformed JavaScript code.
 */
export function transformUsagePureWithOptions(code, options = {}) {
  const { targets = { ie: '11' }, ...rest } = options;
  return transformWithPlugin(code, {
    method: 'usage-pure',
    targets,
    ...rest
  });
}

/**
 * Extracts injected import specifiers from transformed source code.
 * @param {string} code - Transformed JavaScript source containing import declarations.
 * @returns {string[]} List of module specifier strings.
 */
export function extractImportSpecifiers(code) {
  const imports = [];
  const regex = /import\s+(?:[^"'\n]+\s+from\s+)?["']([^"']+)["']/g;
  let match;
  while ((match = regex.exec(code)) !== null) {
    imports.push(match[1]);
  }
  return imports;
}
test/contract.mjs
import assert from 'node:assert/strict';
import {
  transformUsageGlobalWithOptions,
  transformUsagePureWithOptions,
  extractImportSpecifiers
} from '../src/index.mjs';

// 1. Target core-js version specification filters modern API polyfills according to release availability
{
  const code = 'const exists = Object.hasOwn(data, "key");';
  const outV30 = transformUsageGlobalWithOptions(code, { version: '3.0' });
  const outV320 = transformUsageGlobalWithOptions(code, { version: '3.20' });

  const importsV30 = extractImportSpecifiers(outV30);
  const importsV320 = extractImportSpecifiers(outV320);

  assert.equal(
    importsV30.includes('core-js/modules/es.object.has-own.js'),
    false,
    'core-js 3.0 must not inject es.object.has-own because Object.hasOwn requires newer core-js'
  );
  assert.equal(
    importsV320.includes('core-js/modules/es.object.has-own.js'),
    true,
    'core-js 3.20 must inject es.object.has-own when targeting IE 11'
  );
}

// 2. Plugin validates version configuration string and rejects invalid format with descriptive error
{
  assert.throws(
    () => {
      transformUsageGlobalWithOptions('const x = 1;', { version: 'invalid' });
    },
    {
      message: /Invalid version: invalid/
    },
    'Plugin must reject invalid version strings'
  );
}

// 3. Async function declarations in usage-global mode trigger automatic injection of Promise dependencies
{
  const code = 'async function fetchStatus() { return 200; }';
  const output = transformUsageGlobalWithOptions(code);
  const imports = extractImportSpecifiers(output);

  assert.equal(
    imports.includes('core-js/modules/es.promise.js'),
    true,
    'usage-global must inject es.promise when encountering async function declarations'
  );
}

// 4. Array spread elements trigger common iterator polyfills while object spread elements do not
{
  const arraySpreadCode = 'const items = [...elements];';
  const objectSpreadCode = 'const record = { ...properties };';

  const arraySpreadOutput = transformUsageGlobalWithOptions(arraySpreadCode);
  const objectSpreadOutput = transformUsageGlobalWithOptions(objectSpreadCode);

  const arrayImports = extractImportSpecifiers(arraySpreadOutput);
  const objectImports = extractImportSpecifiers(objectSpreadOutput);

  assert.equal(
    arrayImports.includes('core-js/modules/es.array.iterator.js'),
    true,
    'Array spread element must inject es.array.iterator'
  );
  assert.equal(
    objectImports.includes('core-js/modules/es.array.iterator.js'),
    false,
    'Object spread expression must not inject es.array.iterator'
  );
}

// 5. Delegated yield expressions in generator functions automatically trigger common iterator polyfills
{
  const code = 'function* delegateGenerator() { yield* stream; }';
  const output = transformUsageGlobalWithOptions(code);
  const imports = extractImportSpecifiers(output);

  assert.equal(
    imports.includes('core-js/modules/es.array.iterator.js'),
    true,
    'yield* expression must trigger common iterator injection'
  );
}

// 6. Array pattern destructuring triggers iterator polyfills for iterable unpacking
{
  const code = 'const [primary, secondary] = source;';
  const output = transformUsageGlobalWithOptions(code);
  const imports = extractImportSpecifiers(output);

  assert.equal(
    imports.includes('core-js/modules/es.array.iterator.js'),
    true,
    'Array destructuring pattern must trigger iterator polyfill injection'
  );
}

// 7. Usage-pure mode rewrites Symbol.iterator in binary expressions into pure is-iterable helper invocations
{
  const code = 'const iterable = Symbol.iterator in collection;';
  const output = transformUsagePureWithOptions(code);
  const imports = extractImportSpecifiers(output);

  assert.ok(
    imports.some(imp => imp.includes('core-js-pure/features/is-iterable.js')),
    'usage-pure must inject is-iterable pure helper'
  );
  assert.ok(
    output.includes('_isIterable(collection)'),
    'usage-pure must rewrite "Symbol.iterator in collection" to _isIterable(collection)'
  );
}

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

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