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

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"
  ]
}

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;
}

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.');