babel-plugin-polyfill-corejs3 0.11.1

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.

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{
  "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"
  }
}

{
  "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"
  }
}

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;
}

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.');