@babel/core 7.22.5: loadPartialConfig

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.loadPartialConfig in pkg:npm/%40babel/core@7.22.5
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.22.5
Demonstrate these symbols/APIs:
  - @babel/core.loadPartialConfig

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-core-load-partial-config",
  "version": "1.0.0",
  "description": "verify @babel/core.loadPartialConfig in pkg:npm/%40babel/core@7.22.5",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.22.5"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.loadPartialConfig in pkg:npm/%40babel/core@7.22.5",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.22.5"
  ],
  "symbols": [
    "@babel/core.loadPartialConfig"
  ]
}

'use strict';

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

/**
 * Loads partial Babel configuration synchronously.
 *
 * @param {object} [options={}] - Options passed to loadPartialConfig.
 * @returns {object|null} The resolved PartialConfig object or null if ignored.
 */
function loadConfig(options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.loadPartialConfig(defaultOptions);
}

/**
 * Loads partial Babel configuration asynchronously using loadPartialConfigAsync.
 *
 * @param {object} [options={}] - Options passed to loadPartialConfigAsync.
 * @returns {Promise<object|null>} Promise resolving to the PartialConfig object or null.
 */
async function loadConfigAsync(options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.loadPartialConfigAsync(defaultOptions);
}

/**
 * Loads partial Babel configuration with callback-style invocation.
 *
 * @param {object} options - Options passed to loadPartialConfig.
 * @param {Function} callback - Callback function receiving (err, config).
 */
function loadConfigWithCallback(options, callback) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  babel.loadPartialConfig(defaultOptions, callback);
}

/**
 * Checks if a given file/options configuration evaluates to ignored (null).
 *
 * @param {object} options - Options including filename and ignore rules.
 * @returns {boolean} True if the configuration evaluates to null (ignored).
 */
function isIgnored(options) {
  const config = loadConfig(options);
  return config === null;
}

/**
 * Checks whether the resolved partial config loaded configuration from the filesystem.
 *
 * @param {object} options - Options passed to loadPartialConfig.
 * @returns {boolean} True if filesystem configuration was found and loaded.
 */
function hasFilesystemConfig(options) {
  const config = loadConfig(options);
  if (!config) return false;
  return typeof config.hasFilesystemConfig === 'function' ? config.hasFilesystemConfig() : false;
}

module.exports = {
  loadConfig,
  loadConfigAsync,
  loadConfigWithCallback,
  isIgnored,
  hasFilesystemConfig
};

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import * as babel from '@babel/core';

const require = createRequire(import.meta.url);
const {
  loadConfig,
  loadConfigAsync,
  loadConfigWithCallback,
  isIgnored,
  hasFilesystemConfig
} = require('../src/index.js');

async function runContract() {
  // 1. loadPartialConfig is exported by @babel/core as a function and resolves partial configuration synchronously
  assert.equal(typeof babel.loadPartialConfig, 'function', 'babel.loadPartialConfig must be a function');
  assert.equal(typeof babel.loadPartialConfigSync, 'function', 'babel.loadPartialConfigSync must be a function');
  assert.equal(typeof babel.loadPartialConfigAsync, 'function', 'babel.loadPartialConfigAsync must be a function');

  const config = loadConfig({ filename: 'example.js' });
  assert.ok(config !== null, 'loadPartialConfig should return a configuration object');
  assert.equal(typeof config, 'object', 'Returned PartialConfig must be an object');

  // 2. loadPartialConfig returns a PartialConfig object containing resolved options, fileHandling, and files set
  assert.ok(typeof config.options === 'object', 'PartialConfig must expose an options object');
  assert.equal(typeof config.options.cwd, 'string', 'Resolved options must include cwd string');
  assert.equal(typeof config.options.root, 'string', 'Resolved options must include root string');
  assert.equal(typeof config.options.envName, 'string', 'Resolved options must include envName string');
  assert.equal(config.fileHandling, 'transpile', 'fileHandling for standard file should be transpile');
  assert.ok(config.files instanceof Set, 'files property must be an instance of Set');

  // 3. loadPartialConfig returns null when filename matches an ignore pattern
  const ignoredResult = isIgnored({
    filename: '/workspace/test/ignored-sample.js',
    ignore: ['/workspace/test/ignored-sample.js']
  });
  assert.equal(ignoredResult, true, 'isIgnored must return true when file matches ignore pattern');

  const directIgnoredConfig = babel.loadPartialConfig({
    configFile: false,
    babelrc: false,
    filename: '/workspace/test/ignored-sample.js',
    ignore: ['/workspace/test/ignored-sample.js']
  });
  assert.equal(directIgnoredConfig, null, 'loadPartialConfig must return null when ignored');

  // 4. loadPartialConfig resolves options with custom plugins and presets
  const samplePlugin = () => ({
    visitor: {
      Identifier() {}
    }
  });
  const configWithPlugin = loadConfig({
    filename: 'example.js',
    plugins: [samplePlugin]
  });
  assert.ok(configWithPlugin !== null, 'Config with plugin should resolve');
  assert.ok(Array.isArray(configWithPlugin.options.plugins), 'Resolved options.plugins must be an array');
  assert.equal(configWithPlugin.options.plugins.length, 1, 'Resolved options.plugins must contain configured plugin');

  // 5. loadPartialConfig provides hasFilesystemConfig method returning false when filesystem config files are disabled
  assert.equal(typeof config.hasFilesystemConfig, 'function', 'config must have hasFilesystemConfig function');
  assert.equal(config.hasFilesystemConfig(), false, 'hasFilesystemConfig must return false when config files disabled');
  assert.equal(hasFilesystemConfig({ filename: 'example.js' }), false, 'hasFilesystemConfig helper must return false');

  // 6. loadPartialConfigAsync resolves partial configuration asynchronously returning a Promise
  const asyncConfig = await loadConfigAsync({ filename: 'async-example.js' });
  assert.ok(asyncConfig !== null, 'loadConfigAsync must resolve to a valid PartialConfig object');
  assert.equal(asyncConfig.fileHandling, 'transpile', 'Async PartialConfig fileHandling should be transpile');
  assert.equal(asyncConfig.hasFilesystemConfig(), false, 'Async PartialConfig hasFilesystemConfig should return false');

  // 7. loadPartialConfig supports callback-based invocation passing resolved configuration to the callback
  await new Promise((resolve, reject) => {
    loadConfigWithCallback({ filename: 'callback-example.js' }, (err, cbConfig) => {
      if (err) return reject(err);
      try {
        assert.ok(cbConfig !== null, 'Callback must receive non-null configuration');
        assert.equal(cbConfig.fileHandling, 'transpile', 'Callback PartialConfig fileHandling should be transpile');
        assert.equal(typeof cbConfig.options, 'object', 'Callback config must contain options object');
        resolve();
      } catch (assertionErr) {
        reject(assertionErr);
      }
    });
  });

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

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});