@rollup/plugin-commonjs 28.0.7: dynamicRequireTargets

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 dynamicRequireTargets in pkg:npm/%40rollup/plugin-commonjs@28.0.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40rollup/plugin-commonjs@28.0.7
Demonstrate these symbols/APIs:
  - dynamicRequireTargets
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.

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        "@rollup/rollup-win32-arm64-msvc": "4.34.8",
        "@rollup/rollup-win32-ia32-msvc": "4.34.8",
        "@rollup/rollup-win32-x64-msvc": "4.34.8",
        "fsevents": "~2.3.2"
      }
    },
    "node_modules/rollup/node_modules/@types/estree": {
      "version": "1.0.6",
      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.6.tgz",
      "integrity": "sha512-AYnb1nQyY49te+VRAVgmzfcgjYS91mY5P0TKUDCLEM+gNnA+3T6rWITXRLYCpahpqSQbN5cE+gHpnPyXjHWxcw==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-rollup-plugin-commonjs-dynamic-require-targets",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @rollup/plugin-commonjs dynamicRequireTargets",
  "type": "module",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@rollup/plugin-commonjs": "28.0.7",
    "rollup": "4.34.8"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify dynamicRequireTargets in pkg:npm/%40rollup/plugin-commonjs@28.0.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40rollup/plugin-commonjs@28.0.7"
  ],
  "symbols": [
    "dynamicRequireTargets"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import * as rollup from 'rollup';
import commonjs from '@rollup/plugin-commonjs';

/**
 * Bundles code using Rollup with @rollup/plugin-commonjs configured,
 * then dynamically imports the resulting ESM bundle.
 *
 * @param {string} inputPath - Entry point file path.
 * @param {object} [pluginOptions] - Options passed to @rollup/plugin-commonjs.
 * @returns {Promise<any>} The evaluated module namespace.
 */
export async function bundleWithCommonjs(inputPath, pluginOptions = {}) {
  const bundle = await rollup.rollup({
    input: inputPath,
    plugins: [
      commonjs(pluginOptions)
    ]
  });

  const { output } = await bundle.generate({ format: 'esm' });
  const base64Uri = 'data:text/javascript;base64,' + Buffer.from(output[0].code).toString('base64');
  return await import(base64Uri);
}

import assert from 'node:assert/strict';
import { bundleWithCommonjs } from '../src/index.js';

const entryPath = 'test/fixtures/entry.mjs';

// 1. Without dynamicRequireTargets, dynamic require calls throw at runtime
{
  const mod = await bundleWithCommonjs(entryPath);
  assert.throws(
    () => mod.loadModule('greeter.cjs'),
    (err) =>
      err instanceof Error &&
      err.message.includes('Could not dynamically require') &&
      err.message.includes('dynamicRequireTargets')
  );
}

// 2. With dynamicRequireTargets matching glob pattern, modules are loaded dynamically
{
  const mod = await bundleWithCommonjs(entryPath, {
    dynamicRequireTargets: ['test/fixtures/dynamic/*.cjs']
  });

  const greeter = mod.loadModule('greeter.cjs');
  assert.equal(typeof greeter.greet, 'function');
  assert.equal(greeter.greet('CodeSampleX'), 'Hello, CodeSampleX!');

  const math = mod.loadModule('math.cjs');
  assert.equal(typeof math.add, 'function');
  assert.equal(math.add(10, 25), 35);

  const ignored = mod.loadModule('ignored.cjs');
  assert.equal(ignored.secret, 'ignored-secret');
}

// 3. Negation glob pattern prefixed with '!' excludes specified modules from bundling
{
  const mod = await bundleWithCommonjs(entryPath, {
    dynamicRequireTargets: [
      'test/fixtures/dynamic/*.cjs',
      '!test/fixtures/dynamic/ignored.cjs'
    ]
  });

  const greeter = mod.loadModule('greeter.cjs');
  assert.equal(greeter.greet('World'), 'Hello, World!');

  assert.throws(
    () => mod.loadModule('ignored.cjs'),
    (err) =>
      err instanceof Error &&
      err.message.includes('Could not dynamically require')
  );
}

// 4. Dynamic require for unconfigured or non-existent file path throws
{
  const mod = await bundleWithCommonjs(entryPath, {
    dynamicRequireTargets: ['test/fixtures/dynamic/*.cjs']
  });

  assert.throws(
    () => mod.loadModule('nonexistent.cjs'),
    (err) =>
      err instanceof Error &&
      err.message.includes('Could not dynamically require')
  );
}

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

function loadModule(name) {
  return require('./dynamic/' + name);
}

module.exports = { loadModule };

module.exports = {
  greet(name) {
    return 'Hello, ' + name + '!';
  }
};

module.exports = {
  secret: 'ignored-secret'
};

module.exports = {
  add(a, b) {
    return a + b;
  }
};

import { loadModule } from './caller.cjs';
export { loadModule };