CodeSampleX

Ejemplo

@babel/plugin-transform-modules-commonjs 7.29.7: transform ES module import and export to CommonJS format using @babel/plugin-transform-modules-commonjs

Muestra verificada para npm @babel/plugin-transform-modules-commonjs 7.29.7: transform ES module import and export to CommonJS format using…

sha256:02ee514439549a2e47f8dfaa12ad2a4be70dedbb92b833ff5b10eec8f7d5589a

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. 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 alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-23

Caso

HOW
Objetivo
transform ES module import and export to CommonJS format using @babel/plugin-transform-modules-commonjs
Paquetes
Símbolos
  • default
Entorno
node 22.23.2
Creado
2026-08-23T18:20:27Z

Contrato

  1. Plugin default export is a function factory asserting Babel version 7
  2. Plugin factory returns a plugin object named transform-modules-commonjs with Program visitor
  3. Transforms ES named import and export declarations into CommonJS require and exports
  4. Transforms default import and default export declarations with interop helper
  5. Emits simple assignment exports and __esModule flag when loose option is true
  6. Omits use strict directive when strictMode option is false
  7. Omits __esModule export definition when strict option is true
  8. Imports default export without interop helper when noInterop option is true
  9. Transforms re-export named and re-export star declarations into dynamic getters on exports
  10. Transforms side-effect only imports into plain require calls

Archivos

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

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: transform ES module import and export to CommonJS format using @babel/plugin-transform-modules-commonjs
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7
Demonstrate these symbols/APIs:
  - default
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:c2f817cd19f681e5c71741e2e6bbd9cf796ebab6f83826fe0732fe29999ba7b0","constraints":{"executionContext":"node"},"contract":["Plugin default export is a function factory asserting Babel version 7","Plugin factory returns a plugin object named transform-modules-commonjs with Program visitor","Transforms ES named import and export declarations into CommonJS require and exports","Transforms default import and default export declarations with interop helper","Emits simple assignment exports and __esModule flag when loose option is true","Omits use strict directive when strictMode option is false","Omits __esModule export definition when strict option is true","Imports default export without interop helper when noInterop option is true","Transforms re-export named and re-export star declarations into dynamic getters on exports","Transforms side-effect only imports into plain require calls"],"goal":"transform ES module import and export to CommonJS format using @babel/plugin-transform-modules-commonjs","kind":"HOW","packages":["pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7"],"schemaVersion":1,"symbols":["default"]},"contractCommand":["node","test/contract.mjs"],"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/plugin-transform-modules-commonjs@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7","symbols":["default"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-plugin-transform-modules-commonjs",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-modules-commonjs": "7.29.7"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "transform ES module import and export to CommonJS format using @babel/plugin-transform-modules-commonjs",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7"
  ],
  "symbols": [
    "default"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import * as babel from '@babel/core';
import transformModulesCommonjsPlugin from '@babel/plugin-transform-modules-commonjs';

/**
 * Creates an instance of the Babel CommonJS module transform plugin.
 * @param {object} [api] - Babel plugin API object (types, template, etc.).
 * @param {object} [options] - Plugin configuration options (loose, strict, strictMode, noInterop, etc.).
 * @returns {object} Babel plugin instance object.
 */
export function createTransformModulesCommonjsPlugin(api, options = {}) {
  const plugin = transformModulesCommonjsPlugin.default || transformModulesCommonjsPlugin;
  const babelApi = api || {
    types: babel.types,
    template: babel.template,
    traverse: babel.traverse,
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options);
}

/**
 * Transforms JavaScript code using @babel/plugin-transform-modules-commonjs.
 * @param {string} source - ES module source code.
 * @param {object} [pluginOptions] - Options passed to the plugin.
 * @param {object} [babelOptions] - Additional Babel transformSync options.
 * @returns {import('@babel/core').BabelFileResult} Babel transform result.
 */
export function transformModulesCommonjs(source, pluginOptions = {}, babelOptions = {}) {
  const plugin = transformModulesCommonjsPlugin.default || transformModulesCommonjsPlugin;
  return babel.transformSync(source, {
    plugins: [[plugin, pluginOptions]],
    configFile: false,
    babelrc: false,
    ...babelOptions
  });
}
test/contract.mjs
import assert from 'node:assert/strict';
import * as babel from '@babel/core';
import transformModulesCommonjsPlugin from '@babel/plugin-transform-modules-commonjs';
import { createTransformModulesCommonjsPlugin, transformModulesCommonjs } from '../src/index.mjs';

// 1. Plugin default export is a function factory asserting Babel version 7
const plugin = transformModulesCommonjsPlugin.default || transformModulesCommonjsPlugin;
assert.equal(typeof plugin, 'function', 'Plugin default export must be a function');

let assertedVersionRange = null;
const mockApi = {
  types: babel.types,
  template: babel.template,
  traverse: babel.traverse,
  assertVersion(range) {
    assertedVersionRange = range;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersionRange, 7, 'Plugin must assert Babel version 7');

// 2. Plugin factory returns a plugin object named transform-modules-commonjs with Program visitor
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-modules-commonjs', 'Plugin name must be transform-modules-commonjs');
assert.ok(instance.visitor && typeof instance.visitor.Program === 'object', 'Plugin must define Program visitor');

// 3. Transforms ES named import and export declarations into CommonJS require and exports
const codeNamed = `
import { add, PI } from './math';
export const result = add(PI, 10);
`;
const resultNamed = transformModulesCommonjs(codeNamed);
assert.ok(resultNamed.code.includes('require("./math")'), 'Must transform named import to require');
assert.ok(resultNamed.code.includes('exports.result = void 0;'), 'Must initialize export property');
assert.ok(resultNamed.code.includes('exports.result ='), 'Must assign to exports.result');
assert.ok(resultNamed.code.includes('Object.defineProperty(exports, "__esModule"'), 'Must define __esModule property');

// 4. Transforms default import and default export declarations with interop helper
const codeDefault = `
import logger from './logger';
export default function run() {
  return logger('ready');
}
`;
const resultDefault = transformModulesCommonjs(codeDefault);
assert.ok(resultDefault.code.includes('_interopRequireDefault'), 'Must include _interopRequireDefault helper for default import');
assert.ok(resultDefault.code.includes('exports.default = run;'), 'Must export default function on exports.default');

// 5. Emits simple assignment exports and __esModule flag when loose option is true
const codeLoose = `
export const version = '1.0.0';
export function getVersion() { return version; }
`;
const resultLoose = transformModulesCommonjs(codeLoose, { loose: true });
assert.ok(resultLoose.code.includes('exports.__esModule = true;'), 'Loose mode must assign exports.__esModule directly');
assert.ok(resultLoose.code.includes('exports.getVersion = getVersion;'), 'Loose mode must assign functions directly to exports');
assert.ok(resultLoose.code.includes('exports.version = void 0;'), 'Loose mode must declare export variables');

// 6. Omits use strict directive when strictMode option is false
const codeNoStrict = `
export const greeting = 'hello';
`;
const resultNoStrict = transformModulesCommonjs(codeNoStrict, { strictMode: false });
assert.ok(!resultNoStrict.code.startsWith('"use strict";'), 'strictMode: false must omit "use strict" directive');
assert.ok(resultNoStrict.code.includes('exports.greeting ='), 'Must still export greeting');

// 7. Omits __esModule export definition when strict option is true
const codeStrict = `
export const key = 'secret';
`;
const resultStrict = transformModulesCommonjs(codeStrict, { strict: true });
assert.ok(!resultStrict.code.includes('__esModule'), 'strict: true must omit __esModule flag definition');
assert.ok(resultStrict.code.includes('exports.key ='), 'Must still export key');

// 8. Imports default export without interop helper when noInterop option is true
const codeNoInterop = `
import helper from './helper';
const val = helper();
`;
const resultNoInterop = transformModulesCommonjs(codeNoInterop, { noInterop: true });
assert.ok(!resultNoInterop.code.includes('_interopRequireDefault'), 'noInterop: true must not emit interop helper');
assert.ok(resultNoInterop.code.includes('var _helper = require("./helper");'), 'noInterop: true must use direct require');

// 9. Transforms re-export named and re-export star declarations into dynamic getters on exports
const codeReExport = `
export { itemA, itemB as renamedB } from './items';
export * from './all';
`;
const resultReExport = transformModulesCommonjs(codeReExport);
assert.ok(resultReExport.code.includes('require("./items")'), 'Must require re-exported module');
assert.ok(resultReExport.code.includes('require("./all")'), 'Must require wildcard module');
assert.ok(resultReExport.code.includes('Object.defineProperty(exports, "itemA"'), 'Must define getter for itemA');
assert.ok(resultReExport.code.includes('Object.defineProperty(exports, "renamedB"'), 'Must define getter for renamedB');

// 10. Transforms side-effect only imports into plain require calls
const codeSideEffect = `
import './polyfills';
`;
const resultSideEffect = transformModulesCommonjs(codeSideEffect);
assert.ok(resultSideEffect.code.includes('require("./polyfills");'), 'Must transform side-effect import to require');

// Helper function verification
const helperPluginInstance = createTransformModulesCommonjsPlugin();
assert.equal(helperPluginInstance.name, 'transform-modules-commonjs', 'Helper createTransformModulesCommonjsPlugin must return valid plugin');

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

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