@babel/helpers 8.0.0: Retrieve AST nodes, dependencies, minimum version, and metadata for runtime helpers with @babel/helpers

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: Retrieve AST nodes, dependencies, minimum version, and metadata for runtime helpers with @babel/helpers
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/helpers@8.0.0

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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{
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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-helpers",
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      "dependencies": {
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      }
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      "dependencies": {
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        "node": "^22.18.0 || >=24.11.0"
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      "license": "MIT"
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}

{
  "name": "sample-babel-helpers",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @babel/helpers",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "@babel/helpers": "8.0.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "Retrieve AST nodes, dependencies, minimum version, and metadata for runtime helpers with @babel/helpers",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/helpers@8.0.0"
  ]
}

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

/**
 * Returns a list of all helper names available in @babel/helpers.
 * @returns {string[]}
 */
function listAllHelpers() {
  return [...helpers.list];
}

/**
 * Checks if a helper is defined in @babel/helpers.
 * @param {string} name
 * @returns {boolean}
 */
function hasHelper(name) {
  return helpers.list.includes(name);
}

/**
 * Retrieves AST node statements for a runtime helper.
 * @param {string} name
 * @param {Function} [getDependency]
 * @param {string} [bindingName]
 * @param {string[]} [localBindings]
 * @returns {object[]}
 */
function getHelperAst(name, getDependency, bindingName, localBindings) {
  const result = helpers.get(name, getDependency, bindingName, localBindings);
  return result.nodes;
}

/**
 * Retrieves required global identifiers for a helper.
 * @param {string} name
 * @returns {string[]}
 */
function getHelperGlobals(name) {
  const result = helpers.get(name);
  return result.globals;
}

/**
 * Retrieves the minimum Babel version required for a helper.
 * @param {string} name
 * @returns {string}
 */
function getHelperMinVersion(name) {
  return helpers.minVersion(name);
}

/**
 * Retrieves dependent helper names for a helper.
 * @param {string} name
 * @returns {string[]}
 */
function getHelperDependencies(name) {
  return helpers.getDependencies(name);
}

/**
 * Checks if a helper is marked internal.
 * @param {string} name
 * @returns {boolean}
 */
function isHelperInternal(name) {
  return Boolean(helpers.isInternal(name));
}

module.exports = {
  listAllHelpers,
  hasHelper,
  getHelperAst,
  getHelperGlobals,
  getHelperMinVersion,
  getHelperDependencies,
  isHelperInternal,
};

import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  listAllHelpers,
  hasHelper,
  getHelperAst,
  getHelperGlobals,
  getHelperMinVersion,
  getHelperDependencies,
  isHelperInternal,
} = require('../src/index.js');

async function runContract() {
  // 1. listAllHelpers
  const helpersList = listAllHelpers();
  assert.ok(Array.isArray(helpersList), 'listAllHelpers should return an array');
  assert.ok(helpersList.length > 50, 'helpers list should contain many helper definitions');
  assert.ok(helpersList.includes('typeof'), 'helpers list should include typeof');
  assert.ok(helpersList.includes('classCallCheck'), 'helpers list should include classCallCheck');
  assert.ok(helpersList.includes('wrapRegExp'), 'helpers list should include wrapRegExp');
  assert.ok(helpersList.includes('inherits'), 'helpers list should include inherits');

  // 2. hasHelper
  assert.strictEqual(hasHelper('typeof'), true, 'hasHelper should return true for typeof');
  assert.strictEqual(hasHelper('wrapRegExp'), true, 'hasHelper should return true for wrapRegExp');
  assert.strictEqual(hasHelper('nonExistentHelper123'), false, 'hasHelper should return false for unknown helper');

  // 3. getHelperAst
  const typeofAstNodes = getHelperAst('typeof');
  assert.ok(Array.isArray(typeofAstNodes), 'getHelperAst should return an array of AST nodes');
  assert.strictEqual(typeofAstNodes.length, 1, 'typeof helper should have 1 top-level AST node');
  assert.strictEqual(typeofAstNodes[0].type, 'FunctionDeclaration', 'typeof helper AST node should be FunctionDeclaration');
  assert.strictEqual(typeofAstNodes[0].id.name, '_typeof', 'typeof helper default function name should be _typeof');

  // 4. getHelperGlobals
  const typeofGlobals = getHelperGlobals('typeof');
  assert.ok(Array.isArray(typeofGlobals), 'getHelperGlobals should return an array of global identifiers');
  assert.ok(typeofGlobals.includes('Symbol'), 'typeof helper globals should include Symbol');

  const classCallCheckGlobals = getHelperGlobals('classCallCheck');
  assert.ok(Array.isArray(classCallCheckGlobals), 'classCallCheck globals should be an array');
  assert.ok(classCallCheckGlobals.includes('TypeError'), 'classCallCheck globals should include TypeError');

  // 5. getHelperMinVersion
  const typeofMinVer = getHelperMinVersion('typeof');
  assert.strictEqual(typeofMinVer, '7.0.0-beta.0', 'typeof helper minimum version should match 7.0.0-beta.0');

  const wrapRegExpMinVer = getHelperMinVersion('wrapRegExp');
  assert.strictEqual(wrapRegExpMinVer, '7.19.0', 'wrapRegExp helper minimum version should match 7.19.0');

  // 6. getHelperDependencies
  const typeofDeps = getHelperDependencies('typeof');
  assert.ok(Array.isArray(typeofDeps), 'getHelperDependencies should return an array');
  assert.deepStrictEqual(typeofDeps, [], 'typeof helper should have no dependencies');

  const wrapRegExpDeps = getHelperDependencies('wrapRegExp');
  assert.ok(Array.isArray(wrapRegExpDeps), 'wrapRegExp dependencies should be an array');
  assert.ok(wrapRegExpDeps.includes('setPrototypeOf'), 'wrapRegExp dependencies should include setPrototypeOf');
  assert.ok(wrapRegExpDeps.includes('inherits'), 'wrapRegExp dependencies should include inherits');

  // 7. isHelperInternal
  assert.strictEqual(isHelperInternal('typeof'), false, 'typeof helper is not internal');
  assert.strictEqual(isHelperInternal('wrapRegExp'), false, 'wrapRegExp helper is not internal');

  // 8. Unknown helper error handling
  assert.throws(
    () => getHelperAst('unknownHelperNameXYZ'),
    (err) => {
      return (
        err instanceof ReferenceError &&
        err.code === 'BABEL_HELPER_UNKNOWN' &&
        err.helper === 'unknownHelperNameXYZ'
      );
    },
    'getHelperAst should throw BABEL_HELPER_UNKNOWN ReferenceError for unknown helper'
  );

  console.log('Contract assertions passed successfully.');
}

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