@babel/core 7.29.7: loadOptions

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 @babel/core.loadOptions in pkg:npm/%40babel/core@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.7
Demonstrate these symbols/APIs:
  - @babel/core.loadOptions

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-load-options",
  "version": "1.0.0",
  "description": "verify @babel/core.loadOptions in pkg:npm/%40babel/core@7.29.7",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.loadOptions in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.loadOptions"
  ]
}

const babel = require('@babel/core');

/**
 * Loads and normalizes Babel configuration options using @babel/core.loadOptions.
 *
 * @param {object} [options={}] - Custom Babel options.
 * @returns {object|null} The resolved configuration descriptor object, or null if ignored.
 */
function loadBabelOptions(options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.loadOptions(defaultOptions);
}

/**
 * Loads configuration options with custom inline plugins.
 *
 * @param {Array<Function|object>} plugins - Babel plugins to include.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The resolved configuration descriptor with normalized plugins.
 */
function loadOptionsWithPlugins(plugins = [], options = {}) {
  return loadBabelOptions({
    plugins,
    ...options
  });
}

/**
 * Loads configuration options merged with environment-specific settings.
 *
 * @param {string} envName - Target environment name (e.g. 'production', 'development').
 * @param {object} envConfig - Environment specific configuration mapping.
 * @param {object} [options={}] - Base configuration options.
 * @returns {object|null} The resolved configuration descriptor with environment overrides.
 */
function loadEnvironmentOptions(envName, envConfig = {}, options = {}) {
  return loadBabelOptions({
    envName,
    env: envConfig,
    ...options
  });
}

/**
 * Loads configuration options and applies filename-matching overrides.
 *
 * @param {string} filename - Virtual filename for pattern evaluation.
 * @param {Array<object>} overrides - Array of override configuration blocks.
 * @param {object} [options={}] - Base configuration options.
 * @returns {object|null} The resolved configuration descriptor with matched overrides.
 */
function loadOptionsForFile(filename, overrides = [], options = {}) {
  return loadBabelOptions({
    filename,
    overrides,
    ...options
  });
}

/**
 * Checks if a specific file path is ignored according to ignore patterns.
 *
 * @param {string} filename - The file path to test.
 * @param {Array<string|RegExp>} ignorePatterns - Array of ignore patterns.
 * @returns {boolean} True if the file is ignored (loadOptions returns null).
 */
function isIgnoredFile(filename, ignorePatterns = []) {
  const result = loadBabelOptions({
    filename,
    ignore: ignorePatterns
  });
  return result === null;
}

module.exports = {
  loadBabelOptions,
  loadOptionsWithPlugins,
  loadEnvironmentOptions,
  loadOptionsForFile,
  isIgnoredFile
};

const assert = require('assert');
const {
  loadBabelOptions,
  loadOptionsWithPlugins,
  loadEnvironmentOptions,
  loadOptionsForFile,
  isIgnoredFile
} = require('../src/index');

// 1. loadOptions resolves and normalizes passed configuration options into an option descriptor object
{
  const opts = loadBabelOptions({
    sourceMaps: true,
    minified: true,
    compact: true
  });
  assert(opts !== null && typeof opts === 'object', 'loadOptions should return a resolved config object');
  assert.strictEqual(opts.sourceMaps, true, 'sourceMaps option should be preserved');
  assert.strictEqual(opts.minified, true, 'minified option should be preserved');
  assert.strictEqual(opts.compact, true, 'compact option should be preserved');
  assert(Array.isArray(opts.plugins), 'plugins array should be initialized');
  assert(Array.isArray(opts.presets), 'presets array should be initialized');
  assert(typeof opts.targets === 'object' && opts.targets !== null, 'targets object should be initialized');
}

// 2. loadOptions returns null when the input filename matches an ignore pattern
{
  const ignoredPath = '/workspace/project/ignored-module.js';
  const notIgnoredPath = '/workspace/project/included-module.js';
  const ignorePatterns = ['/workspace/project/ignored-module.js'];

  assert.strictEqual(
    isIgnoredFile(ignoredPath, ignorePatterns),
    true,
    'loadOptions must return null for ignored files'
  );
  assert.strictEqual(
    isIgnoredFile(notIgnoredPath, ignorePatterns),
    false,
    'loadOptions must return options object for non-ignored files'
  );
}

// 3. loadOptions normalizes inline plugin functions into active plugin descriptors
{
  let visitedIdentifier = false;
  const customPlugin = function() {
    return {
      visitor: {
        Identifier() {
          visitedIdentifier = true;
        }
      }
    };
  };

  const opts = loadOptionsWithPlugins([customPlugin]);
  assert(opts !== null, 'loadOptions with plugins should return config object');
  assert.strictEqual(opts.plugins.length, 1, 'plugins array should contain 1 normalized plugin descriptor');
  assert.strictEqual(typeof opts.plugins[0].visitor, 'object', 'plugin descriptor should contain visitor object');
  assert.strictEqual(typeof opts.plugins[0].visitor.Identifier, 'object', 'visitor Identifier handler should be defined');
}

// 4. loadOptions merges environment-specific configuration when envName is configured
{
  const envConfig = {
    production: {
      minified: true,
      comments: false
    },
    development: {
      minified: false,
      comments: true
    }
  };

  const prodOpts = loadEnvironmentOptions('production', envConfig);
  assert(prodOpts !== null, 'prodOpts should return config object');
  assert.strictEqual(prodOpts.minified, true, 'production env should set minified to true');
  assert.strictEqual(prodOpts.comments, false, 'production env should set comments to false');

  const devOpts = loadEnvironmentOptions('development', envConfig);
  assert(devOpts !== null, 'devOpts should return config object');
  assert.strictEqual(devOpts.minified, false, 'development env should set minified to false');
  assert.strictEqual(devOpts.comments, true, 'development env should set comments to true');
}

// 5. loadOptions applies matching overrides based on filename test patterns
{
  const overrides = [
    {
      test: /\.jsx$/,
      sourceType: 'module',
      comments: false
    },
    {
      test: /\.json$/,
      sourceType: 'script',
      comments: true
    }
  ];

  const jsxOpts = loadOptionsForFile('component.jsx', overrides);
  assert(jsxOpts !== null, 'jsxOpts should return config object');
  assert.strictEqual(jsxOpts.sourceType, 'module', 'JSX file should match JSX override sourceType');
  assert.strictEqual(jsxOpts.comments, false, 'JSX file should match JSX override comments');

  const jsOpts = loadOptionsForFile('script.js', overrides, { sourceType: 'unambiguous' });
  assert(jsOpts !== null, 'jsOpts should return config object');
  assert.strictEqual(jsOpts.sourceType, 'unambiguous', 'Non-matching JS file should retain base sourceType');
}

// 6. loadOptions throws an error when unknown or invalid configuration options are passed
{
  assert.throws(
    () => {
      loadBabelOptions({
        invalidBabelConfigProperty: true
      });
    },
    (err) => {
      return err instanceof Error && err.message.includes('Unknown option: .invalidBabelConfigProperty');
    },
    'Unknown option must throw validation error'
  );
}

console.log('All @babel/core.loadOptions contract assertions passed successfully.');