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.

sha256:198f2598f6b2c7bfd71c404a834bb63eee3412df9d9aecbcd2196024c1b13995

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…		 2026-09-04

Case

HOW
Goal
verify pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Packages
Environment
node 22.23.2
Created
2026-09-04T23:29:20Z

Contract

  1. The include option forces polyfill injection for specified modules even when targets natively support the feature
  2. The exclude option suppresses polyfill injection for specified modules even when targets require polyfilling
  3. Regular expression patterns are supported in exclude options for pattern-based polyfill filtering
  4. Specifying non-existent polyfill module names in include or exclude throws an option validation error
  5. Specifying overlapping polyfills in both include and exclude options throws a configuration conflict error
  6. The entry-global method respects include and exclude options during full core-js entry expansion
  7. The usage-pure method respects exclude options by skipping helper rewriting for excluded modules

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
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
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 code using @babel/core and babel-plugin-polyfill-corejs3.
 * @param {string} code - Source code to transform.
 * @param {object} pluginOptions - Options passed to babel-plugin-polyfill-corejs3.
 * @param {object} [babelOptions] - Additional Babel transformSync options.
 * @returns {string} Transformed JavaScript code.
 */
export function transformWithCorejs3(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 include/exclude options.
 * @param {string} code - Source code to transform.
 * @param {object} [options] - Configuration options.
 * @returns {string} Transformed code.
 */
export function transformUsageGlobalWithFilters(code, options = {}) {
  const { targets = { ie: '11' }, include, exclude, ...rest } = options;
  const pluginOptions = {
    method: 'usage-global',
    targets,
    ...rest
  };
  if (include !== undefined) pluginOptions.include = include;
  if (exclude !== undefined) pluginOptions.exclude = exclude;
  return transformWithCorejs3(code, pluginOptions);
}

/**
 * Transforms code in usage-pure mode with include/exclude options.
 * @param {string} code - Source code to transform.
 * @param {object} [options] - Configuration options.
 * @returns {string} Transformed code.
 */
export function transformUsagePureWithFilters(code, options = {}) {
  const { targets = { ie: '11' }, include, exclude, ...rest } = options;
  const pluginOptions = {
    method: 'usage-pure',
    targets,
    ...rest
  };
  if (include !== undefined) pluginOptions.include = include;
  if (exclude !== undefined) pluginOptions.exclude = exclude;
  return transformWithCorejs3(code, pluginOptions);
}

/**
 * Transforms code in entry-global mode with include/exclude options.
 * @param {string} code - Source code to transform.
 * @param {object} [options] - Configuration options.
 * @returns {string} Transformed code.
 */
export function transformEntryGlobalWithFilters(code, options = {}) {
  const { targets = { chrome: '80' }, include, exclude, ...rest } = options;
  const pluginOptions = {
    method: 'entry-global',
    targets,
    ...rest
  };
  if (include !== undefined) pluginOptions.include = include;
  if (exclude !== undefined) pluginOptions.exclude = exclude;
  return transformWithCorejs3(code, pluginOptions);
}

/**
 * Extracts injected import specifiers from transformed source code.
 * @param {string} code - Transformed JavaScript source containing import declarations.
 * @returns {string[]} List of imported module paths.
 */
export function extractInjectedImports(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 {
  transformUsageGlobalWithFilters,
  transformUsagePureWithFilters,
  transformEntryGlobalWithFilters,
  extractInjectedImports
} from '../src/index.mjs';

// 1. The include option forces polyfill injection for specified modules even when targets natively support the feature
{
  const code = 'const ok = [1, 2].includes(1);';
  const defaultOutput = transformUsageGlobalWithFilters(code, { targets: { chrome: '120' } });
  const includedOutput = transformUsageGlobalWithFilters(code, {
    targets: { chrome: '120' },
    include: ['es.array.includes']
  });

  const defaultImports = extractInjectedImports(defaultOutput);
  const includedImports = extractInjectedImports(includedOutput);

  assert.equal(
    defaultImports.length,
    0,
    'Chrome 120 natively supports includes so no imports should be injected by default'
  );
  assert.equal(
    includedImports.includes('core-js/modules/es.array.includes.js'),
    true,
    'include: ["es.array.includes"] must force injection of es.array.includes even on modern targets'
  );
}

// 2. The exclude option suppresses polyfill injection for specified modules even when targets require polyfilling
{
  const code = 'const ok = [1, 2].includes(1); const p = new Promise(resolve => resolve(ok));';
  const defaultOutput = transformUsageGlobalWithFilters(code, { targets: { ie: '11' } });
  const excludedOutput = transformUsageGlobalWithFilters(code, {
    targets: { ie: '11' },
    exclude: ['es.promise']
  });

  const defaultImports = extractInjectedImports(defaultOutput);
  const excludedImports = extractInjectedImports(excludedOutput);

  assert.equal(
    defaultImports.includes('core-js/modules/es.promise.js'),
    true,
    'Targeting IE 11 without exclude must inject es.promise'
  );
  assert.equal(
    excludedImports.includes('core-js/modules/es.promise.js'),
    false,
    'exclude: ["es.promise"] must suppress injection of es.promise'
  );
  assert.equal(
    excludedImports.includes('core-js/modules/es.array.includes.js'),
    true,
    'Non-excluded features like es.array.includes must still be injected'
  );
}

// 3. Regular expression patterns are supported in exclude options for pattern-based polyfill filtering
{
  const code = 'const ok = [1, 2].includes(1); const p = new Promise(resolve => resolve(ok));';
  const regexExcludedOutput = transformUsageGlobalWithFilters(code, {
    targets: { ie: '11' },
    exclude: [/^es\.promise$/]
  });

  const imports = extractInjectedImports(regexExcludedOutput);

  assert.equal(
    imports.includes('core-js/modules/es.promise.js'),
    false,
    'Regex exclude pattern /^es\\.promise$/ must suppress es.promise injection'
  );
  assert.equal(
    imports.includes('core-js/modules/es.array.includes.js'),
    true,
    'Regex exclude pattern must not suppress non-matching modules like es.array.includes'
  );
}

// 4. Specifying non-existent polyfill module names in include or exclude throws an option validation error
{
  assert.throws(
    () => {
      transformUsageGlobalWithFilters('const x = 1;', {
        include: ['non-existent-corejs3-polyfill']
      });
    },
    {
      message: /The following "include" patterns didn't match any polyfill/
    },
    'Invalid include pattern must throw option validation error'
  );

  assert.throws(
    () => {
      transformUsageGlobalWithFilters('const x = 1;', {
        exclude: ['non-existent-corejs3-polyfill']
      });
    },
    {
      message: /The following "exclude" patterns didn't match any polyfill/
    },
    'Invalid exclude pattern must throw option validation error'
  );
}

// 5. Specifying overlapping polyfills in both include and exclude options throws a configuration conflict error
{
  assert.throws(
    () => {
      transformUsageGlobalWithFilters('const x = 1;', {
        include: ['es.array.includes'],
        exclude: ['es.array.includes']
      });
    },
    {
      message: /The following polyfills were matched both by "include" and "exclude" patterns/
    },
    'Overlapping include and exclude patterns must throw configuration error'
  );
}

// 6. The entry-global method respects include and exclude options during full core-js entry expansion
{
  const entryCode = 'import "core-js";';

  const withExcludedPromise = transformEntryGlobalWithFilters(entryCode, {
    targets: { chrome: '80' },
    exclude: ['es.promise']
  });
  const excludedImports = extractInjectedImports(withExcludedPromise);

  assert.equal(
    excludedImports.includes('core-js/modules/es.promise.js'),
    false,
    'entry-global must not inject es.promise when excluded'
  );

  const withIncludedIncludes = transformEntryGlobalWithFilters(entryCode, {
    targets: { chrome: '120' },
    include: ['es.array.includes']
  });
  const includedImports = extractInjectedImports(withIncludedIncludes);

  assert.equal(
    includedImports.includes('core-js/modules/es.array.includes.js'),
    true,
    'entry-global must inject es.array.includes when explicitly included even on Chrome 120'
  );
}

// 7. The usage-pure method respects exclude options by skipping helper rewriting for excluded modules
{
  const code = 'const ok = [1, 2].includes(1);';

  const pureDefault = transformUsagePureWithFilters(code, { targets: { ie: '11' } });
  const pureExcluded = transformUsagePureWithFilters(code, {
    targets: { ie: '11' },
    exclude: ['es.array.includes']
  });

  assert.equal(
    pureDefault.includes('_includesInstanceProperty('),
    true,
    'Default usage-pure on IE 11 must rewrite includes to pure helper'
  );
  assert.equal(
    pureExcluded.includes('_includesInstanceProperty('),
    false,
    'usage-pure with exclude: ["es.array.includes"] must not rewrite includes to pure helper'
  );
  assert.equal(
    pureExcluded.includes('[1, 2].includes(1)'),
    true,
    'usage-pure with excluded includes must preserve original method call expression'
  );
}

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

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