@babel/helpers 7.29.7

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/%40babel/helpers@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/helpers@7.29.7

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-helpers",
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  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/helpers": "7.29.7"
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}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/helpers@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/helpers@7.29.7"
  ]
}

import {
  list,
  get,
  minVersion,
  getDependencies,
  isInternal,
  ensure
} from "@babel/helpers";

/**
 * Returns the list of all registered Babel helper names.
 * @returns {string[]}
 */
export function listAllHelpers() {
  return list;
}

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

/**
 * Retrieves the AST nodes and globals for a specified helper.
 * @param {string} name
 * @param {Function} [getDependency]
 * @param {string|object} [bindingName]
 * @param {string[]} [localBindings]
 * @param {Function} [adjustAst]
 * @returns {{ nodes: object[], globals: string[] }}
 */
export function getHelperAst(name, getDependency, bindingName, localBindings, adjustAst) {
  return get(name, getDependency, bindingName, localBindings, adjustAst);
}

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

/**
 * Returns the dependency helper names required by a helper.
 * @param {string} name
 * @returns {string[]}
 */
export function getHelperDependencies(name) {
  return getDependencies(name);
}

/**
 * Checks if a helper is flagged for internal compiler use.
 * @param {string} name
 * @returns {boolean}
 */
export function isHelperInternal(name) {
  return Boolean(isInternal(name));
}

/**
 * Ensures that a helper name is registered and valid, throwing ReferenceError if unknown.
 * @param {string} name
 */
export function ensureHelper(name) {
  ensure(name);
}

import assert from "node:assert/strict";
import {
  listAllHelpers,
  hasHelper,
  getHelperAst,
  getHelperMinVersion,
  getHelperDependencies,
  isHelperInternal,
  ensureHelper
} from "../src/index.mjs";

// Test 1: listAllHelpers returns an array of runtime helper names including typeof, classCallCheck, and wrapRegExp
{
  const helpers = listAllHelpers();
  assert.ok(Array.isArray(helpers), "helpers list must be an array");
  assert.ok(helpers.length > 0, "helpers list must not be empty");
  assert.ok(helpers.includes("typeof"), "helpers list must contain typeof");
  assert.ok(helpers.includes("classCallCheck"), "helpers list must contain classCallCheck");
  assert.ok(helpers.includes("wrapRegExp"), "helpers list must contain wrapRegExp");
}

// Test 2: hasHelper checks if a helper is registered in @babel/helpers list
{
  assert.equal(hasHelper("typeof"), true, "hasHelper should return true for known helper 'typeof'");
  assert.equal(hasHelper("classCallCheck"), true, "hasHelper should return true for known helper 'classCallCheck'");
  assert.equal(hasHelper("nonExistentHelper99"), false, "hasHelper should return false for unknown helper");
}

// Test 3: getHelperAst retrieves the AST node statements and globals for a helper declaration
{
  const typeofAst = getHelperAst("typeof");
  assert.ok(typeofAst, "getHelperAst should return an object");
  assert.ok(Array.isArray(typeofAst.nodes), "typeofAst.nodes should be an array");
  assert.ok(typeofAst.nodes.length > 0, "typeofAst.nodes should not be empty");
  assert.equal(typeofAst.nodes[0].type, "FunctionDeclaration", "first node should be a FunctionDeclaration");
  assert.ok(Array.isArray(typeofAst.globals), "typeofAst.globals should be an array");
  assert.ok(typeofAst.globals.includes("Symbol"), "typeofAst.globals should include Symbol");

  const classCallCheckAst = getHelperAst("classCallCheck");
  assert.ok(classCallCheckAst.nodes.length > 0, "classCallCheckAst.nodes should not be empty");
  assert.ok(classCallCheckAst.globals.includes("TypeError"), "classCallCheckAst.globals should include TypeError");
}

// Test 4: getHelperMinVersion returns the minimum Babel runtime version for a helper
{
  const version = getHelperMinVersion("typeof");
  assert.equal(typeof version, "string", "minVersion should return a version string");
  assert.equal(version, "7.0.0-beta.0", "typeof minVersion should match 7.0.0-beta.0");

  const decsVersion = getHelperMinVersion("applyDecs2311");
  assert.equal(decsVersion, "7.24.0", "applyDecs2311 minVersion should match 7.24.0");
}

// Test 5: getHelperDependencies returns dependent helper names required by a helper
{
  const arrayWithoutHolesDeps = getHelperDependencies("arrayWithoutHoles");
  assert.ok(Array.isArray(arrayWithoutHolesDeps), "dependencies should be an array");
  assert.deepEqual(arrayWithoutHolesDeps, ["arrayLikeToArray"], "arrayWithoutHoles should depend on arrayLikeToArray");

  const typeofDeps = getHelperDependencies("typeof");
  assert.ok(Array.isArray(typeofDeps), "dependencies should be an array");
  assert.deepEqual(typeofDeps, [], "typeof should have no dependencies");
}

// Test 6: isHelperInternal indicates whether a helper is flagged for internal compiler use
{
  const internalStatus = isHelperInternal("typeof");
  assert.equal(typeof internalStatus, "boolean", "isHelperInternal should return a boolean");
  assert.equal(internalStatus, false, "typeof is not an internal helper");
}

// Test 7: ensureHelper succeeds for known helpers and throws BABEL_HELPER_UNKNOWN ReferenceError for unknown helper names
{
  assert.doesNotThrow(() => {
    ensureHelper("typeof");
  }, "ensureHelper should not throw for valid helper");

  assert.throws(
    () => {
      ensureHelper("nonExistentHelper99");
    },
    (err) => {
      return (
        err instanceof ReferenceError &&
        err.code === "BABEL_HELPER_UNKNOWN" &&
        err.helper === "nonExistentHelper99"
      );
    },
    "ensureHelper should throw ReferenceError with code BABEL_HELPER_UNKNOWN"
  );
}

// Test 8: getHelperAst throws BABEL_HELPER_UNKNOWN ReferenceError when requesting an unknown helper name
{
  assert.throws(
    () => {
      getHelperAst("nonExistentHelper99");
    },
    (err) => {
      return (
        err instanceof ReferenceError &&
        err.code === "BABEL_HELPER_UNKNOWN" &&
        err.helper === "nonExistentHelper99"
      );
    },
    "getHelperAst should throw ReferenceError with code BABEL_HELPER_UNKNOWN"
  );
}

console.log("All @babel/helpers@7.29.7 contract tests passed successfully.");