Sample
@rollup/plugin-commonjs 28.0.9: ignore
Verified sample for npm @rollup/plugin-commonjs 28.0.9: ignore. The contract ran on node 22 · linux debian/x64 · docker and passed.
sha256:ee6ba3eef68d3fd411cdbe01a16263db79537eb53ad0359dc199dbdd4375ad6e
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 debian/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2… |
2026-09-03 |
Case
HOW- Goal
- verify ignore in pkg:npm/%40rollup/plugin-commonjs@28.0.9
- Packages
- Symbols
-
- ignore
- Environment
- node 22.23.2
- Created
- 2026-09-03T15:16:24Z
Contract
- assert @rollup/plugin-commonjs with ignore: ['unbundled-optional-lib'] preserves require as an unconverted runtime call without hoisting to top level
- assert unignored missing dependencies trigger Rollup unresolved dependency warnings and are hoisted to module evaluation time
- assert ignore accepts a predicate function (id) => boolean to selectively leave matching require statements unconverted while transforming others
- assert when generating ES module output, unignored dependencies are converted into static imports while ignored dependencies remain unconverted runtime require calls
Files
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- src/index.js
- test/contract.mjs
- test/fixtures/direct.cjs
- test/fixtures/esm_entry.cjs
- test/fixtures/mixed.cjs
Source
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 ignore in pkg:npm/%40rollup/plugin-commonjs@28.0.9
Kind: HOW
Use EXACTLY these public packages and versions:
- pkg:npm/%40rollup/plugin-commonjs@28.0.9
Demonstrate these symbols/APIs:
- ignore
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-linux-powerpc64le-gnu": "4.34.8",
"@rollup/rollup-linux-riscv64-gnu": "4.34.8",
"@rollup/rollup-linux-s390x-gnu": "4.34.8",
"@rollup/rollup-linux-x64-gnu": "4.34.8",
"@rollup/rollup-linux-x64-musl": "4.34.8",
"@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-ignore",
"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": "verify ignore in pkg:npm/%40rollup/plugin-commonjs@28.0.9",
"kind": "HOW",
"packages": [
"pkg:npm/%40rollup/plugin-commonjs@28.0.9"
],
"symbols": [
"ignore"
]
}
import { rollup } from 'rollup';
import commonjs from '@rollup/plugin-commonjs';
/**
* Bundle CommonJS source using Rollup and @rollup/plugin-commonjs.
*
* @param {string} inputPath - Entry point file path.
* @param {object} [pluginOptions] - Options passed to @rollup/plugin-commonjs.
* @param {object} [rollupOptions] - Additional options passed to rollup.
* @param {string} [format='cjs'] - Output format ('cjs' or 'es').
* @returns {Promise<{ code: string, warnings: Array<object> }>} Bundled output and warnings.
*/
export async function bundleWithCommonJs(inputPath, pluginOptions = {}, rollupOptions = {}, format = 'cjs') {
const warnings = [];
const bundle = await rollup({
input: inputPath,
onwarn(warning) {
warnings.push(warning);
},
plugins: [
commonjs(pluginOptions)
],
...rollupOptions
});
const { output } = await bundle.generate({ format });
return { code: output[0].code, warnings };
}
import assert from 'node:assert/strict';
import vm from 'node:vm';
import { bundleWithCommonJs } 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); }),
console
};
vm.runInNewContext(code, context);
return context.module.exports;
}
async function runContract() {
const directPath = 'test/fixtures/direct.cjs';
const mixedPath = 'test/fixtures/mixed.cjs';
const esmPath = 'test/fixtures/esm_entry.cjs';
// ---------------------------------------------------------------------------
// Contract Assertion 1:
// With ignore: ['unbundled-optional-lib'], require('unbundled-optional-lib') is
// preserved as an unconverted runtime require call inside the function body,
// preventing eager execution during bundle initialization.
// ---------------------------------------------------------------------------
{
const { code, warnings } = await bundleWithCommonJs(
directPath,
{ ignore: ['unbundled-optional-lib'] },
{},
'cjs'
);
assert.equal(
warnings.length,
0,
'assert no unresolved dependency warnings are emitted for ignored modules'
);
assert.match(
code,
/return require\(["']unbundled-optional-lib["']\)/,
'assert literal require call is preserved in function body'
);
assert.doesNotMatch(
code,
/var require\$\$\d+\s*=\s*require\(["']unbundled-optional-lib["']\)/,
'assert require is not hoisted to bundle top level'
);
let requiredAtInit = false;
let requiredOnCall = null;
const mod = runCjs(code, (specifier) => {
requiredOnCall = specifier;
return { loaded: specifier };
});
assert.equal(
requiredAtInit,
false,
'assert ignored require is not executed during bundle initialization'
);
assert.equal(typeof mod.getAddon, 'function', 'assert getAddon function is exported');
const result = mod.getAddon();
assert.equal(
requiredOnCall,
'unbundled-optional-lib',
'assert runtime require is executed only when calling getAddon()'
);
assert.deepEqual(result, { loaded: 'unbundled-optional-lib' });
}
// ---------------------------------------------------------------------------
// Contract Assertion 2:
// Without ignore, an unignored external require is hoisted to module top level
// and emits an unresolved dependency warning when the package cannot be resolved.
// ---------------------------------------------------------------------------
{
const { code, warnings } = await bundleWithCommonJs(
directPath,
{},
{},
'cjs'
);
assert.ok(
warnings.some((w) => w.message.includes('unbundled-optional-lib') && w.message.includes('could not be resolved')),
'assert Rollup emits unresolved dependency warning for unignored missing module'
);
assert.match(
code,
/var require\$\$\d+\s*=\s*require\(["']unbundled-optional-lib["']\)/,
'assert unignored dependency is hoisted to top-level require'
);
let requiredAtInit = false;
assert.throws(
() => {
runCjs(code, (specifier) => {
if (specifier === 'unbundled-optional-lib') {
requiredAtInit = true;
throw new Error(`Module ${specifier} not installed`);
}
return {};
});
},
/Module unbundled-optional-lib not installed/,
'assert top-level initialization fails immediately when unignored dependency is absent'
);
assert.equal(requiredAtInit, true, 'assert require was eagerly called at init time');
}
// ---------------------------------------------------------------------------
// Contract Assertion 3:
// ignore accepts a predicate function (id: string) => boolean to selectively
// keep matching require calls unconverted while transforming others.
// ---------------------------------------------------------------------------
{
const { code, warnings } = await bundleWithCommonJs(
mixedPath,
{
ignore: (id) => id === 'optional-feature-b'
},
{
external: ['optional-feature-a', 'optional-feature-b']
},
'cjs'
);
assert.match(
code,
/return require\(["']optional-feature-b["']\)/,
'assert ignored feature-b remains an unconverted require call'
);
assert.match(
code,
/var require\$\$\d+\s*=\s*require\(["']optional-feature-a["']\)/,
'assert non-ignored feature-a is hoisted to top-level require'
);
const calls = [];
const mod = runCjs(code, (specifier) => {
calls.push(specifier);
return { name: specifier };
});
assert.deepEqual(
calls,
['optional-feature-a'],
'assert non-ignored feature-a was required at load time, while feature-b was not'
);
const resB = mod.getLibB();
assert.deepEqual(resB, { name: 'optional-feature-b' });
assert.deepEqual(
calls,
['optional-feature-a', 'optional-feature-b'],
'assert feature-b was only required upon explicit function invocation'
);
}
// ---------------------------------------------------------------------------
// Contract Assertion 4:
// When generating ES module output (format: 'es'), unignored dependencies are
// converted into top-level static import statements, whereas ignored dependencies
// produce no static import and remain as unconverted require calls.
// ---------------------------------------------------------------------------
{
const { code: ignoredCode } = await bundleWithCommonJs(
esmPath,
{ ignore: ['runtime-only-module'] },
{ external: ['runtime-only-module'] },
'es'
);
assert.doesNotMatch(
ignoredCode,
/import\s+.*from\s+['"]runtime-only-module['"]/,
'assert ignored module does not produce an ESM static import statement'
);
assert.match(
ignoredCode,
/require\(["']runtime-only-module["']\)/,
'assert ignored module preserves require call in ESM output'
);
const { code: unignoredCode } = await bundleWithCommonJs(
esmPath,
{},
{ external: ['runtime-only-module'] },
'es'
);
assert.match(
unignoredCode,
/import\s+require\$\$\d+\s+from\s+['"]runtime-only-module['"]/,
'assert unignored dependency is converted into a top-level ESM import statement'
);
}
console.log('All contract assertions passed successfully.');
}
runContract().catch((err) => {
console.error('Contract failed:', err);
process.exit(1);
});
function getAddon() {
return require('unbundled-optional-lib');
}
module.exports = { getAddon };
function getRuntimeDependency() {
return require('runtime-only-module');
}
module.exports = { getRuntimeDependency };
function getLibA() {
return require('optional-feature-a');
}
function getLibB() {
return require('optional-feature-b');
}
module.exports = { getLibA, getLibB };
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