CodeSampleX

Sample

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

Verified sample for npm @babel/plugin-transform-modules-commonjs 7.29.7: transform ES module import and export to CommonJS format using…

sha256:02ee514439549a2e47f8dfaa12ad2a4be70dedbb92b833ff5b10eec8f7d5589a

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
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

Case

HOW
Goal
transform ES module import and export to CommonJS format using @babel/plugin-transform-modules-commonjs
Packages
Symbols
  • default
Environment
node 22.23.2
Created
2026-08-23T18:20:27Z

Contract

  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

Files

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

Download the source artifact (tar.gz)

Source

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
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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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