CodeSampleX

Sample

@babel/plugin-transform-modules-commonjs 7.29.7: default

Verified sample for npm @babel/plugin-transform-modules-commonjs 7.29.7: default. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:16028d0b19b757741a98178746053fc0022682d4f811fdeac053af209857af60

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…		 2026-08-27

Case

HOW
Goal
verify @babel/plugin-transform-modules-commonjs.default in pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7
Packages
Symbols
  • @babel/plugin-transform-modules-commonjs.default
Environment
node 22.23.2
Created
2026-08-27T12:09:51Z

Contract

  1. Default export resolves to a plugin factory function asserting Babel version 7
  2. Plugin factory returns a plugin object named transform-modules-commonjs with a 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. Transforms namespace wildcard imports with interop wildcard helper
  6. Transforms re-export named and re-export star declarations into dynamic getters on exports
  7. Transforms side-effect only imports into bare require calls
  8. Transforms dynamic import expressions when proposal flag is active
  9. Emits lazy loading wrapper functions when lazy option is enabled
  10. Emits simple assignment exports and __esModule flag when loose option is true
  11. Omits use strict directive when strictMode option is false
  12. Omits __esModule export definition when strict option is true
  13. Imports default export without interop helper when noInterop option is true
  14. Supports custom module wrapper hooks registered via defineCommonJSHook
  15. Configures import interop strategy via importInterop option

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: verify @babel/plugin-transform-modules-commonjs.default in pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7
Demonstrate these symbols/APIs:
  - @babel/plugin-transform-modules-commonjs.default

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": "verify @babel/plugin-transform-modules-commonjs.default in pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-modules-commonjs@7.29.7"
  ],
  "symbols": [
    "@babel/plugin-transform-modules-commonjs.default"
  ]
}
src/index.mjs
import * as babel from '@babel/core';
import pluginTransformModulesCommonjs, { defineCommonJSHook } from '@babel/plugin-transform-modules-commonjs';

/**
 * Resolves the Babel plugin function from default or namespace export.
 * @param {any} mod
 * @returns {Function}
 */
export function getPlugin(mod = pluginTransformModulesCommonjs) {
  if (typeof mod === 'function') return mod;
  if (typeof mod?.default === 'function') return mod.default;
  if (typeof mod?.default?.default === 'function') return mod.default.default;
  return mod;
}

/**
 * Creates an instantiated Babel plugin instance using the plugin factory.
 * @param {object} [api]
 * @param {object} [options]
 * @param {string} [dirname]
 * @returns {object}
 */
export function createPlugin(api, options = {}, dirname = '') {
  const plugin = getPlugin();
  const babelApi = api || {
    types: babel.types,
    template: babel.template,
    traverse: babel.traverse,
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options, dirname);
}

/**
 * Transforms ES module source code to CommonJS using the default plugin export.
 * @param {string} code
 * @param {object} [pluginOptions]
 * @param {object} [babelOptions]
 * @returns {import('@babel/core').BabelFileResult}
 */
export function transformToCommonJS(code, pluginOptions = {}, babelOptions = {}) {
  const plugin = getPlugin();
  return babel.transformSync(code, {
    plugins: [[plugin, pluginOptions]],
    configFile: false,
    babelrc: false,
    ...babelOptions
  });
}

export { defineCommonJSHook };
test/contract.mjs
import assert from 'node:assert/strict';
import * as babel from '@babel/core';
import pluginTransformModulesCommonjs, { defineCommonJSHook } from '@babel/plugin-transform-modules-commonjs';
import { getPlugin, createPlugin, transformToCommonJS } from '../src/index.mjs';

const plugin = getPlugin(pluginTransformModulesCommonjs);

// 1. Default export resolves to a plugin factory function asserting Babel version 7
assert.equal(typeof plugin, 'function', 'Plugin export must resolve to a function');
let assertedVersion = null;
const mockApi = {
  types: babel.types,
  template: babel.template,
  traverse: babel.traverse,
  assertVersion(v) { assertedVersion = v; },
  assumption() { return false; }
};
const pluginObj = plugin(mockApi, {});
assert.equal(assertedVersion, 7, 'Plugin must assert Babel version 7');

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

// 3. Transforms ES named import and export declarations into CommonJS require and exports
const cNamed = transformToCommonJS(`
import { foo, bar } from 'dep';
export const value = foo(bar);
`);
assert.ok(cNamed.code.includes('require("dep")'), 'Imports should transform to require');
assert.ok(cNamed.code.includes('exports.value = void 0;'), 'Export should be initialized');
assert.ok(cNamed.code.includes('exports.value ='), 'Export should be assigned');
assert.ok(cNamed.code.includes('Object.defineProperty(exports, "__esModule"'), 'Should define __esModule');

// 4. Transforms default import and default export declarations with interop helper
const cDefault = transformToCommonJS(`
import myDefault from 'pkg';
export default function main() { return myDefault(); }
`);
assert.ok(cDefault.code.includes('_interopRequireDefault'), 'Default import uses interop helper');
assert.ok(cDefault.code.includes('exports.default = main;'), 'Default export sets exports.default');

// 5. Transforms namespace wildcard imports with interop wildcard helper
const cWildcard = transformToCommonJS(`
import * as ns from 'pkg';
export const all = ns;
`);
assert.ok(cWildcard.code.includes('_interopRequireWildcard'), 'Namespace import uses interopRequireWildcard');

// 6. Transforms re-export named and re-export star declarations into dynamic getters on exports
const cReExport = transformToCommonJS(`
export { alpha, beta as gamma } from 'mod';
export * from 'other';
`);
assert.ok(cReExport.code.includes('Object.defineProperty(exports, "alpha"'), 'Re-export defines getter for alpha');
assert.ok(cReExport.code.includes('Object.defineProperty(exports, "gamma"'), 'Re-export defines getter for gamma');
assert.ok(cReExport.code.includes('require("mod")'), 'Re-export requires mod');
assert.ok(cReExport.code.includes('require("other")'), 'Wildcard re-export requires other');

// 7. Transforms side-effect only imports into bare require calls
const cSideEffect = transformToCommonJS(`
import 'polyfill';
`);
assert.ok(cSideEffect.code.includes('require("polyfill");'), 'Side-effect import transforms to bare require');

// 8. Transforms dynamic import expressions when proposal flag is active
const cDynamic = babel.transformSync(`async function load() { return import('./lazy-mod'); }`, {
  plugins: [
    function(api) {
      const p = plugin(api, {});
      return {
        ...p,
        pre(file) {
          file.set('@babel/plugin-proposal-dynamic-import', true);
          p.pre?.call(this, file);
        }
      };
    }
  ],
  configFile: false,
  babelrc: false
});
assert.ok(cDynamic.code.includes('Promise.resolve()'), 'Dynamic import transforms with Promise.resolve');
assert.ok(cDynamic.code.includes("require('./lazy-mod')") || cDynamic.code.includes('require("./lazy-mod")'), 'Dynamic import requires module');

// 9. Emits lazy loading wrapper functions when lazy option is enabled
const cLazy = transformToCommonJS(`
import { heavy } from 'heavy-module';
import { util } from './local-util';
export function run() { return heavy(util()); }
`, { lazy: true });
assert.ok(cLazy.code.includes('function _heavyModule()'), 'Lazy option creates wrapper function for non-relative imports');
assert.ok(cLazy.code.includes('require("heavy-module")'), 'Lazy function requires module on demand');

// 10. Emits simple assignment exports and __esModule flag when loose option is true
const cLoose = transformToCommonJS(`
export const version = '2.0.0';
export function helper() {}
`, { loose: true });
assert.ok(cLoose.code.includes('exports.__esModule = true;'), 'Loose mode assigns exports.__esModule directly');
assert.ok(cLoose.code.includes('exports.helper = helper;'), 'Loose mode assigns helper directly');

// 11. Omits use strict directive when strictMode option is false
const cNoStrict = transformToCommonJS(`export const a = 1;`, { strictMode: false });
assert.ok(!cNoStrict.code.startsWith('"use strict";'), 'strictMode false omits "use strict"');

// 12. Omits __esModule export definition when strict option is true
const cStrict = transformToCommonJS(`export const secret = 42;`, { strict: true });
assert.ok(!cStrict.code.includes('__esModule'), 'strict true omits __esModule');

// 13. Imports default export without interop helper when noInterop option is true
const cNoInterop = transformToCommonJS(`import helper from 'helper'; const x = helper();`, { noInterop: true });
assert.ok(!cNoInterop.code.includes('_interopRequireDefault'), 'noInterop true does not include interop helper');

// 14. Supports custom module wrapper hooks registered via defineCommonJSHook
let hookCalled = false;
const cHook = babel.transformSync(`import { x } from 'hooked'; export const val = x;`, {
  plugins: [
    function(api) {
      const p = plugin(api, { lazy: true });
      return {
        ...p,
        pre(file) {
          defineCommonJSHook(file, {
            wrapReference(ref, payload) {
              hookCalled = true;
              return ref;
            }
          });
          p.pre?.call(this, file);
        }
      };
    }
  ],
  configFile: false,
  babelrc: false
});
assert.ok(hookCalled, 'defineCommonJSHook callback was invoked during AST transform');
assert.ok(cHook.code.includes('require("hooked")'), 'Hooked transform emits require');

// 15. Configures import interop strategy via importInterop option
const cInteropNode = transformToCommonJS(`import foo from 'foo';`, { importInterop: 'node' });
assert.ok(!cInteropNode.code.includes('_interopRequireDefault'), 'importInterop node does not use interop helper');
assert.ok(cInteropNode.code.includes('var _foo = require("foo");'), 'importInterop node assigns require directly');

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

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