@rollup/plugin-commonjs 28.0.9: demonstrate ignoreDynamicRequires behavior and dynamic require handling in @rollup/plugin-commonjs

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: demonstrate ignoreDynamicRequires behavior and dynamic require handling in @rollup/plugin-commonjs
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40rollup/plugin-commonjs@28.0.9
Demonstrate these symbols/APIs:
  - ignoreDynamicRequires

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.

{"case":{"caseId":"case:sha256:d9b4672f25ff029c5d3a1b8d9dd79fff17b6ab2202a5c30c9a3ea2ba9d7f49b3","contract":["Dynamic require calls cannot be statically resolved and, with ignoreDynamicRequires: false by default, are replaced with a synthetic commonjsRequire helper that throws a runtime error.","Setting ignoreDynamicRequires: true preserves dynamic require expressions in the bundled output without generating the error-throwing helper.","When dynamicRequireTargets is configured alongside ignoreDynamicRequires: false, dynamic require calls matching configured target globs resolve to bundled modules while unmatched calls throw an error.","When dynamicRequireTargets is configured alongside ignoreDynamicRequires: true, dynamic require calls matching configured target globs resolve to bundled modules while unmatched calls fall back to native runtime require."],"goal":"demonstrate ignoreDynamicRequires behavior and dynamic require handling in @rollup/plugin-commonjs","kind":"HOW","packages":["pkg:npm/%40rollup/plugin-commonjs@28.0.9"],"schemaVersion":1,"symbols":["ignoreDynamicRequires"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40rollup/plugin-commonjs@28.0.9"],"schemaVersion":1,"subject":"pkg:npm/%40rollup/plugin-commonjs@28.0.9","symbols":["ignoreDynamicRequires"],"verifierAdapter":"node-typescript@1"}

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    },
    "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-ignore-dynamic-requires",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@rollup/plugin-commonjs": "28.0.9",
    "rollup": "4.34.8"
  }
}

{
  "schemaVersion": 1,
  "goal": "demonstrate ignoreDynamicRequires behavior and dynamic require handling in @rollup/plugin-commonjs",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40rollup/plugin-commonjs@28.0.9"
  ],
  "symbols": [
    "ignoreDynamicRequires"
  ]
}

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

/**
 * Bundles code using Rollup and @rollup/plugin-commonjs.
 *
 * @param {string} inputPath - Entry point file path.
 * @param {object} [pluginOptions] - Options passed to @rollup/plugin-commonjs.
 * @returns {Promise<{ code: string }>} Bundled output code.
 */
export async function bundleCommonJs(inputPath, pluginOptions = {}) {
  const bundle = await rollup.rollup({
    input: inputPath,
    plugins: [
      commonjs(pluginOptions)
    ]
  });

  const { output } = await bundle.generate({ format: 'cjs' });
  return { code: output[0].code };
}

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

function runCjs(code, mockRequire) {
  const module = { exports: {} };
  const context = {
    module,
    exports: module.exports,
    require: mockRequire || ((p) => { throw new Error('Cannot find module ' + p); })
  };
  vm.runInNewContext(code, context);
  return context.module.exports;
}

async function runContract() {
  const directPath = 'test/fixtures/dynamic_direct.cjs';
  const targetsPath = 'test/fixtures/dynamic_targets.cjs';

  // ---------------------------------------------------------------------------
  // Contract Assertion 1:
  // Dynamic require calls cannot be statically resolved and, with
  // ignoreDynamicRequires: false by default, are replaced with a synthetic
  // commonjsRequire helper that throws a runtime error.
  // ---------------------------------------------------------------------------
  {
    const defaultRes = await bundleCommonJs(directPath);
    assert.match(
      defaultRes.code,
      /function commonjsRequire\s*\(/,
      'assert commonjsRequire helper is generated by default'
    );
    assert.match(
      defaultRes.code,
      /throw new Error\(['"]Could not dynamically require/,
      'assert commonjsRequire helper throws error for dynamic require'
    );

    const explicitFalseRes = await bundleCommonJs(directPath, { ignoreDynamicRequires: false });
    assert.match(
      explicitFalseRes.code,
      /function commonjsRequire\s*\(/,
      'assert explicit ignoreDynamicRequires: false generates commonjsRequire helper'
    );

    const mod = runCjs(defaultRes.code);
    assert.throws(
      () => mod.dynamicLoad('unbundled-lib'),
      /Could not dynamically require "unbundled-lib"/,
      'assert calling dynamic require throws runtime error under default ignoreDynamicRequires'
    );
  }

  // ---------------------------------------------------------------------------
  // Contract Assertion 2:
  // Setting ignoreDynamicRequires: true preserves dynamic require expressions
  // in the bundled output without generating the error-throwing helper.
  // ---------------------------------------------------------------------------
  {
    const trueRes = await bundleCommonJs(directPath, { ignoreDynamicRequires: true });
    assert.match(
      trueRes.code,
      /require\(target\)/,
      'assert literal require(target) expression is preserved'
    );
    assert.doesNotMatch(
      trueRes.code,
      /function commonjsRequire\s*\(/,
      'assert commonjsRequire throwing helper is not generated'
    );
    assert.doesNotMatch(
      trueRes.code,
      /Could not dynamically require/,
      'assert no dynamic require error string is emitted'
    );

    const mod = runCjs(trueRes.code, (p) => ({ mock: p }));
    const result = mod.dynamicLoad('custom-pkg');
    assert.equal(
      result.mock,
      'custom-pkg',
      'assert preserved dynamic require executes native runtime require'
    );
  }

  // ---------------------------------------------------------------------------
  // Contract Assertion 3:
  // When dynamicRequireTargets is configured alongside ignoreDynamicRequires: false,
  // dynamic require calls matching configured target globs resolve to bundled
  // modules while unmatched calls throw an error.
  // ---------------------------------------------------------------------------
  {
    const resFalse = await bundleCommonJs(targetsPath, {
      dynamicRequireTargets: ['test/fixtures/dynamic/*.cjs'],
      ignoreDynamicRequires: false
    });
    assert.match(
      resFalse.code,
      /getDynamicModules\(\)\[resolvedPath\]\(\)/,
      'assert matching target resolves from dynamic module registry'
    );
    assert.match(
      resFalse.code,
      /throw new Error\(['"]Could not dynamically require/,
      'assert unmatched target throws error when ignoreDynamicRequires is false'
    );

    const mod = runCjs(resFalse.code);
    assert.equal(
      mod.loadDynamic('en.cjs').greeting,
      'hello',
      'assert bundled dynamic module en.cjs is loaded successfully'
    );
    assert.equal(
      mod.loadDynamic('fr.cjs').greeting,
      'bonjour',
      'assert bundled dynamic module fr.cjs is loaded successfully'
    );
    assert.throws(
      () => mod.loadDynamic('unmatched.cjs'),
      /Could not dynamically require/,
      'assert unmatched dynamic require throws error when ignoreDynamicRequires is false'
    );
  }

  // ---------------------------------------------------------------------------
  // Contract Assertion 4:
  // When dynamicRequireTargets is configured alongside ignoreDynamicRequires: true,
  // dynamic require calls matching configured target globs resolve to bundled
  // modules while unmatched calls fall back to native runtime require.
  // ---------------------------------------------------------------------------
  {
    const resTrue = await bundleCommonJs(targetsPath, {
      dynamicRequireTargets: ['test/fixtures/dynamic/*.cjs'],
      ignoreDynamicRequires: true
    });
    assert.match(
      resTrue.code,
      /getDynamicModules\(\)\[resolvedPath\]\(\)/,
      'assert matching target resolves from dynamic module registry'
    );
    assert.match(
      resTrue.code,
      /return require\(path\);/,
      'assert unmatched target falls back to native require'
    );
    assert.doesNotMatch(
      resTrue.code,
      /throw new Error\(['"]Could not dynamically require/,
      'assert unmatched target does not throw dynamic require error'
    );

    const mod = runCjs(resTrue.code, (p) => ({ fallback: p }));
    assert.equal(
      mod.loadDynamic('en.cjs').greeting,
      'hello',
      'assert bundled dynamic module en.cjs is loaded successfully'
    );
    assert.equal(
      mod.loadDynamic('fr.cjs').greeting,
      'bonjour',
      'assert bundled dynamic module fr.cjs is loaded successfully'
    );
    const fallbackResult = mod.loadDynamic('unmatched.cjs');
    assert.equal(
      fallbackResult.fallback,
      './dynamic/unmatched.cjs',
      'assert unmatched dynamic require falls back to native require without throwing'
    );
  }

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

runContract().catch((err) => {
  console.error('Contract failed:', err);
  process.exit(1);
});

module.exports = {
  greeting: 'hello'
};

module.exports = {
  greeting: 'bonjour'
};

function dynamicLoad(target) {
  return require(target);
}

module.exports = { dynamicLoad };

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

module.exports = { loadDynamic };