CodeSampleX

Sample

@rollup/plugin-commonjs 28.0.7: ignoreTryCatch

Verified sample for npm @rollup/plugin-commonjs 28.0.7: ignoreTryCatch. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:b348c018d9d8962f201e9d143411be56a8b726b6530afa3f9f3196512d9cfd8e

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 ignoreTryCatch in pkg:npm/%40rollup/plugin-commonjs@28.0.7
Packages
Symbols
  • ignoreTryCatch
Environment
node 22.23.2
Created
2026-09-03T09:41:31Z

Contract

  1. assert @rollup/plugin-commonjs by default (ignoreTryCatch: true) leaves external require calls inside try-catch blocks unconverted as runtime require statements without hoisting static imports
  2. assert setting ignoreTryCatch: false converts require calls inside try-catch blocks into top-level static imports and references the imported identifier within the try block
  3. assert setting ignoreTryCatch: 'remove' removes external require calls from try-catch blocks, replacing assignments with undefined and emitting no static imports
  4. assert ignoreTryCatch accepts an array of package IDs to selectively leave specified modules unconverted while converting omitted modules to static imports
  5. assert ignoreTryCatch accepts a function allowing per-module dynamic control returning boolean or 'remove'

Files

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

Download the source artifact (tar.gz)

Source

NOTES.md
# Notes: Rollup CommonJS Plugin ignoreTryCatch

## Search Result
`search_known_solution` returned `NO_SAFE_MATCH` for `@rollup/plugin-commonjs@28.0.7` with symbol `ignoreTryCatch`.

## Naive Model Assumption
A common developer and LLM assumption is that `@rollup/plugin-commonjs` converts all CommonJS `require()` calls into static ES module `import` statements unconditionally, or that optional dependencies wrapped in `try { ... } catch (e) { ... }` blocks are automatically hoisted as static ES module imports that cause runtime module resolution errors when the optional package is not installed.

## Failure Mode & Reality
When a CommonJS module contains `require('optional-pkg')` inside a `try { ... }` block:
1. By default (`ignoreTryCatch: true`), `@rollup/plugin-commonjs` leaves external `require` calls inside `try` blocks unconverted as runtime `require(...)` calls, preventing them from being hoisted as top-level static imports and preserving runtime try-catch fallback semantics.
2. When explicitly configured with `ignoreTryCatch: false`, all `require` statements in try blocks are hoisted into top-level static `import` declarations (e.g. `import require$$0 from 'optional-pkg'`), causing failure if the module is missing or not intended to be statically imported.
3. When configured with `ignoreTryCatch: 'remove'`, `require()` calls inside try blocks are eliminated (overwritten with `undefined` when assigned, or removed completely when standalone), avoiding static imports altogether.
4. When configured with an array of IDs (`string[]`), only specified module IDs are left unconverted, while unlisted IDs are hoisted into static imports.
5. When configured with a function `(id: string) => boolean | 'remove'`, conversion behavior can be determined dynamically per module ID.
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 ignoreTryCatch 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:
  - ignoreTryCatch

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-commonjs-ignore-try-catch",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "@rollup/plugin-commonjs": "28.0.7",
    "rollup": "4.62.4"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify ignoreTryCatch in pkg:npm/%40rollup/plugin-commonjs@28.0.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40rollup/plugin-commonjs@28.0.7"
  ],
  "symbols": [
    "ignoreTryCatch"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import { rollup } from 'rollup';
import commonjs from '@rollup/plugin-commonjs';

function createVirtualPlugin(source) {
  return {
    name: 'test-virtual',
    resolveId(id) {
      if (id === 'entry.cjs') return id;
      return null;
    },
    load(id) {
      if (id === 'entry.cjs') return source;
      return null;
    }
  };
}

async function testDefaultIgnoreTryCatch() {
  const cjsCode = `
let optionalA;
try {
  optionalA = require('opt-a');
} catch (e) {
  optionalA = 'fallback';
}
module.exports = { optionalA };
`;

  const bundle = await rollup({
    input: 'entry.cjs',
    external: ['opt-a'],
    plugins: [createVirtualPlugin(cjsCode), commonjs()]
  });

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

  assert.ok(
    code.includes("require('opt-a')"),
    'assert @rollup/plugin-commonjs by default (ignoreTryCatch: true) leaves external require calls inside try-catch blocks unconverted as runtime require statements without hoisting static imports'
  );
  assert.ok(
    !code.includes("from 'opt-a'"),
    'No static import should be emitted for opt-a under default ignoreTryCatch'
  );
}

async function testFalseIgnoreTryCatch() {
  const cjsCode = `
let optionalA;
try {
  optionalA = require('opt-a');
} catch (e) {
  optionalA = 'fallback';
}
module.exports = { optionalA };
`;

  const bundle = await rollup({
    input: 'entry.cjs',
    external: ['opt-a'],
    plugins: [createVirtualPlugin(cjsCode), commonjs({ ignoreTryCatch: false })]
  });

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

  assert.ok(
    code.includes("from 'opt-a'"),
    'assert setting ignoreTryCatch: false converts require calls inside try-catch blocks into top-level static imports and references the imported identifier within the try block'
  );
  assert.ok(
    !code.includes("require('opt-a')"),
    'No runtime require should remain when ignoreTryCatch is false'
  );
}

async function testRemoveIgnoreTryCatch() {
  const cjsCode = `
let optionalA;
try {
  optionalA = require('opt-a');
} catch (e) {}
try {
  require('side-effect-opt');
} catch (e) {}
module.exports = { optionalA };
`;

  const bundle = await rollup({
    input: 'entry.cjs',
    external: ['opt-a', 'side-effect-opt'],
    plugins: [createVirtualPlugin(cjsCode), commonjs({ ignoreTryCatch: 'remove' })]
  });

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

  assert.ok(
    code.includes("optionalA = undefined;"),
    'assert setting ignoreTryCatch: "remove" removes external require calls from try-catch blocks, replacing assignments with undefined and emitting no static imports'
  );
  assert.ok(
    !code.includes('opt-a') && !code.includes('side-effect-opt'),
    'Module names should not appear in imports or require calls when ignoreTryCatch is remove'
  );
}

async function testArrayIgnoreTryCatch() {
  const cjsCode = `
let optionalA, optionalB;
try {
  optionalA = require('opt-a');
} catch (e) {}
try {
  optionalB = require('opt-b');
} catch (e) {}
module.exports = { optionalA, optionalB };
`;

  const bundle = await rollup({
    input: 'entry.cjs',
    external: ['opt-a', 'opt-b'],
    plugins: [createVirtualPlugin(cjsCode), commonjs({ ignoreTryCatch: ['opt-a'] })]
  });

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

  assert.ok(
    code.includes("require('opt-a')") && code.includes("from 'opt-b'"),
    'assert ignoreTryCatch accepts an array of package IDs to selectively leave specified modules unconverted while converting omitted modules to static imports'
  );
}

async function testFunctionIgnoreTryCatch() {
  const cjsCode = `
let optionalA, optionalB, optionalC;
try {
  optionalA = require('opt-a');
} catch (e) {}
try {
  optionalB = require('opt-b');
} catch (e) {}
try {
  optionalC = require('opt-c');
} catch (e) {}
module.exports = { optionalA, optionalB, optionalC };
`;

  const bundle = await rollup({
    input: 'entry.cjs',
    external: ['opt-a', 'opt-b', 'opt-c'],
    plugins: [
      createVirtualPlugin(cjsCode),
      commonjs({
        ignoreTryCatch: (id) => {
          if (id === 'opt-c') return 'remove';
          if (id === 'opt-a') return true;
          return false;
        }
      })
    ]
  });

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

  assert.ok(
    code.includes("require('opt-a')") &&
      code.includes("from 'opt-b'") &&
      code.includes("optionalC = undefined;"),
    'assert ignoreTryCatch accepts a function allowing per-module dynamic control returning boolean or "remove"'
  );
}

async function main() {
  await testDefaultIgnoreTryCatch();
  await testFalseIgnoreTryCatch();
  await testRemoveIgnoreTryCatch();
  await testArrayIgnoreTryCatch();
  await testFunctionIgnoreTryCatch();
  console.log('Contract passed');
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});

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