Ejemplo

@babel/core 7.29.6: buildExternalHelpers

Muestra verificada para npm @babel/core 7.29.6: buildExternalHelpers. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:b7449e514e82dd74df3bc5519a8589e814df596e6ae44f1fd293946dbfa2d4ab

MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia: Contrato firmado aprobado
Recibos de verificación: 1
Claves de firma que lo compilaron: 1

Entorno declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Entornos de las ejecuciones de verificación

Entorno	Contrato	Etapas	Ejecución
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…	2026-09-03

Caso

HOW

Objetivo: verify @babel/core.buildExternalHelpers in pkg:npm/%40babel/core@7.29.6
Paquetes: @babel/core 7.29.6
Símbolos: @babel/core.buildExternalHelpers
Entorno: node 22.23.2
Creado: 2026-09-03T11:58:34Z

Contrato

buildExternalHelpers returns all runtime helpers wrapped in a global scope function when called without arguments
buildExternalHelpers emits only requested helpers when an explicit allowlist array is specified
buildExternalHelpers supports global, module, var, and umd output formats
buildExternalHelpers with var output format returns executable JavaScript that evaluates to the babelHelpers object
buildExternalHelpers throws an Error matching Unsupported output type when an invalid output format is specified
buildExternalHelpers allowlist filters strictly and does not automatically resolve helper dependencies
helpers generated with var format execute correctly in a sandbox environment for class inheritance and type checking

Archivos

PROMPT.md
csx.json
package-lock.json
package.json
spec.json
src/index.js
test/contract.js

Descargar el artefacto de código fuente (tar.gz)

Código fuente

PROMPT.md

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.buildExternalHelpers in pkg:npm/%40babel/core@7.29.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.6
Demonstrate these symbols/APIs:
  - @babel/core.buildExternalHelpers
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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.

csx.json

{"case":{"caseId":"case:sha256:8091d93127da200137d46dd9b8fbb8056c1c83656d4dfeadeec505c043114ca5","constraints":{"executionContext":"node"},"contract":["buildExternalHelpers returns all runtime helpers wrapped in a global scope function when called without arguments","buildExternalHelpers emits only requested helpers when an explicit allowlist array is specified","buildExternalHelpers supports global, module, var, and umd output formats","buildExternalHelpers with var output format returns executable JavaScript that evaluates to the babelHelpers object","buildExternalHelpers throws an Error matching Unsupported output type when an invalid output format is specified","buildExternalHelpers allowlist filters strictly and does not automatically resolve helper dependencies","helpers generated with var format execute correctly in a sandbox environment for class inheritance and type checking"],"goal":"verify @babel/core.buildExternalHelpers in pkg:npm/%40babel/core@7.29.6","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.6"],"schemaVersion":1,"symbols":["@babel/core.buildExternalHelpers"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.29.6"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.29.6","symbols":["@babel/core.buildExternalHelpers"],"verifierAdapter":"node-typescript@1"}

package-lock.json

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  "name": "sample-babel-buildexternalhelpers",
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  "lockfileVersion": 3,
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    },
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package.json

{
  "name": "sample-babel-buildexternalhelpers",
  "version": "1.0.0",
  "description": "verify @babel/core.buildExternalHelpers in pkg:npm/%40babel/core@7.29.6",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.29.6"
  },
  "license": "MIT-0"
}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.buildExternalHelpers in pkg:npm/%40babel/core@7.29.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.6"
  ],
  "symbols": [
    "@babel/core.buildExternalHelpers"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

src/index.js

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

/**
 * Builds all external helpers in the specified output format.
 *
 * @param {string} [outputType='global'] - Output format ('global', 'module', 'var', 'umd').
 * @returns {string} The generated helper code.
 */
function buildAllHelpers(outputType = 'global') {
  return babel.buildExternalHelpers(undefined, outputType);
}

/**
 * Builds external helpers for a specific list of helper names.
 *
 * @param {string[]} allowlist - Array of helper names to include.
 * @param {string} [outputType='global'] - Output format ('global', 'module', 'var', 'umd').
 * @returns {string} The generated helper code.
 */
function buildHelpers(allowlist, outputType = 'global') {
  return babel.buildExternalHelpers(allowlist, outputType);
}

/**
 * Builds external helpers with 'var' format and evaluates them in a VM context.
 *
 * @param {string[]} allowlist - Array of helper names to include.
 * @param {object} [context={}] - Optional sandbox context.
 * @returns {object} The babelHelpers object.
 */
function buildHelpersInContext(allowlist, context = {}) {
  const code = babel.buildExternalHelpers(allowlist, 'var');
  const sandbox = vm.createContext(context);
  return vm.runInContext(code, sandbox);
}

module.exports = {
  buildAllHelpers,
  buildHelpers,
  buildHelpersInContext
};

test/contract.js

const assert = require('assert');
const {
  buildAllHelpers,
  buildHelpers,
  buildHelpersInContext
} = require('../src/index.js');

// 1. buildExternalHelpers returns all runtime helpers wrapped in a global scope function when called without arguments
{
  const code = buildAllHelpers();
  assert.strictEqual(typeof code, 'string', 'Helpers output must be a string');
  assert.ok(code.length > 50000, 'Default helpers output should contain all helpers');
  assert.ok(code.includes('var babelHelpers = global.babelHelpers = {};'), 'Should initialize global babelHelpers');
  assert.ok(code.includes('babelHelpers.inherits = _inherits;'), 'Should include standard helper definitions');
}

// 2. buildExternalHelpers emits only requested helpers when an explicit allowlist array is specified
{
  const code = buildHelpers(['classCallCheck']);
  assert.strictEqual(typeof code, 'string', 'Allowlist helpers output must be a string');
  assert.ok(code.includes('babelHelpers.classCallCheck = _classCallCheck;'), 'Should include requested helper');
  assert.strictEqual(code.includes('babelHelpers.inherits = _inherits;'), false, 'Should exclude unrequested helpers');
}

// 3. buildExternalHelpers supports global, module, var, and umd output formats
{
  const globalCode = buildHelpers(['inherits'], 'global');
  assert.ok(globalCode.includes('(function (global) {'), 'Global format should include IIFE wrapper');

  const moduleCode = buildHelpers(['inherits'], 'module');
  assert.ok(moduleCode.includes('export { _inherits as inherits };'), 'Module format should export helper');

  const varCode = buildHelpers(['inherits'], 'var');
  assert.ok(varCode.includes('var babelHelpers = {};'), 'Var format should declare babelHelpers variable');
  assert.ok(varCode.trim().endsWith('babelHelpers;'), 'Var format should evaluate to babelHelpers');

  const umdCode = buildHelpers(['inherits'], 'umd');
  assert.ok(umdCode.includes('define(["exports"], factory);'), 'UMD format should support AMD definition');
  assert.ok(umdCode.includes('typeof exports === "object"'), 'UMD format should support CommonJS exports');
}

// 4. buildExternalHelpers with var output format returns executable JavaScript that evaluates to the babelHelpers object
{
  const helpers = buildHelpersInContext(['classCallCheck']);
  assert.strictEqual(typeof helpers, 'object', 'Helpers result must be an object');
  assert.strictEqual(typeof helpers.classCallCheck, 'function', 'classCallCheck must be an executable function');
}

// 5. buildExternalHelpers throws an Error matching Unsupported output type when an invalid output format is specified
{
  assert.throws(
    () => buildHelpers(['inherits'], 'unsupported_format'),
    /Unsupported output type unsupported_format/
  );
}

// 6. buildExternalHelpers allowlist filters strictly and does not automatically resolve helper dependencies
{
  const withoutDep = buildHelpers(['inherits'], 'var');
  assert.ok(withoutDep.includes('babelHelpers.inherits = _inherits;'), 'Should include requested inherits helper');
  assert.strictEqual(withoutDep.includes('babelHelpers.setPrototypeOf = _setPrototypeOf;'), false, 'Should omit unrequested dependency setPrototypeOf');

  const withDep = buildHelpers(['inherits', 'setPrototypeOf'], 'var');
  assert.ok(withDep.includes('babelHelpers.inherits = _inherits;'), 'Should include inherits helper');
  assert.ok(withDep.includes('babelHelpers.setPrototypeOf = _setPrototypeOf;'), 'Should include explicitly requested setPrototypeOf helper');
}

// 7. helpers generated with var format execute correctly in a sandbox environment for class inheritance and type checking
{
  const helpers = buildHelpersInContext(['classCallCheck', 'inherits', 'setPrototypeOf']);

  function SuperClass() {}
  function SubClass() {
    helpers.classCallCheck(this, SubClass);
  }
  helpers.inherits(SubClass, SuperClass);

  const instance = new SubClass();
  assert.ok(instance instanceof SubClass, 'instance should be SubClass instance');
  assert.ok(instance instanceof SuperClass, 'instance should be SuperClass instance');
  assert.strictEqual(Object.getPrototypeOf(SubClass.prototype), SuperClass.prototype);
  assert.strictEqual(Object.getPrototypeOf(SubClass), SuperClass);

  assert.throws(
    () => SubClass(),
    /Cannot call a class as a function/
  );
}

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

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