CodeSampleX

Sample

@babel/plugin-transform-duplicate-named-capturing-groups-regex 8.0.1

Verified sample for npm @babel/plugin-transform-duplicate-named-capturing-groups-regex 8.0.1. The contract ran on node 22 · linux alpine/x64 · docker and…

sha256:08c417e21bab69fd6bb4e396712fb01b2f86ff45daf344ce99e412ad9bdf0d25

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

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@1		 2026-08-20

Case

HOW
Goal
verify pkg:npm/%40babel/plugin-transform-duplicate-named-capturing-groups-regex@8.0.1
Packages
Environment
node 22.23.2
Created
2026-08-20T17:46:49Z

Contract

  1. plugin exports a Babel plugin declaration function
  2. plugin returns a plugin object with name transform-duplicate-named-capturing-groups-regex and RegExpLiteral visitor
  3. plugin transforms duplicate named capturing groups into numbered groups wrapped with runtime helper
  4. transformed regex correctly populates named capture groups for both branches during exec and match
  5. transformed regex supports multiple duplicate named groups across alternation branches
  6. transformed regex supports string replacement using named capture group syntax
  7. transformed regex supports function replacement receiving named capture groups
  8. plugin leaves regular expressions without duplicate named capturing groups untouched

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • 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 pkg:npm/%40babel/plugin-transform-duplicate-named-capturing-groups-regex@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-duplicate-named-capturing-groups-regex@8.0.1
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - 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.
csx.json
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package-lock.json
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package.json
{
  "name": "sample-babel-plugin-transform-duplicate-named-capturing-groups-regex",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-transform-duplicate-named-capturing-groups-regex": "8.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-duplicate-named-capturing-groups-regex@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-duplicate-named-capturing-groups-regex@8.0.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import * as babel from '@babel/core';
import plugin from '@babel/plugin-transform-duplicate-named-capturing-groups-regex';

// 1. plugin exports a Babel plugin declaration function
assert.equal(typeof plugin, 'function', 'plugin must be a function');

// 2. plugin returns a plugin object with name transform-duplicate-named-capturing-groups-regex and RegExpLiteral visitor
const mockApi = {
  assertVersion: () => true,
  assumption: () => false
};
const pluginObj = plugin(mockApi, {});
assert.equal(typeof pluginObj, 'object', 'plugin factory must return an object');
assert.equal(pluginObj.name, 'transform-duplicate-named-capturing-groups-regex', 'plugin name must match');
assert.ok(pluginObj.visitor && pluginObj.visitor.RegExpLiteral, 'plugin must declare RegExpLiteral visitor');

// Helper to transform code using Babel with the plugin
function transformCode(source, options = {}) {
  return babel.transformSync(source, {
    plugins: [plugin],
    configFile: false,
    babelrc: false,
    ...options
  });
}

// Helper to evaluate transformed code in an isolated scope
function evaluateTransformed(source, options = {}) {
  const result = transformCode(source, options);
  const fn = new Function(result.code + '; return { re: typeof re !== "undefined" ? re : undefined, res: typeof res !== "undefined" ? res : undefined };');
  return fn();
}

// 3. plugin transforms duplicate named capturing groups into numbered groups wrapped with runtime helper
const codeSingle = 'var re = /(?<year>[0-9]{4})-[0-9]{2}|[0-9]{2}-(?<year>[0-9]{4})/;';
const resSingle = transformCode(codeSingle);
assert.ok(resSingle.code.includes('_wrapRegExp'), 'transformed code must use _wrapRegExp helper');
assert.ok(resSingle.code.includes('year'), 'mapping object must include capture group name');

// 4. transformed regex correctly populates named capture groups for both branches during exec and match
const evalSingle = evaluateTransformed(codeSingle);
const matchBranch1 = evalSingle.re.exec('2024-08');
assert.ok(matchBranch1, 'branch 1 should match');
assert.equal(matchBranch1.groups.year, '2024', 'branch 1 should capture year');

const matchBranch2 = evalSingle.re.exec('08-2024');
assert.ok(matchBranch2, 'branch 2 should match');
assert.equal(matchBranch2.groups.year, '2024', 'branch 2 should capture year');

const strMatch1 = '2024-08'.match(evalSingle.re);
assert.ok(strMatch1, 'String.prototype.match branch 1 should match');
assert.equal(strMatch1.groups.year, '2024', 'String.prototype.match branch 1 should capture year');

// 5. transformed regex supports multiple duplicate named groups across alternation branches
const codeMulti = 'var re = /(?<year>[0-9]{4})-(?<month>[0-9]{2})|(?<month>[0-9]{2})-(?<year>[0-9]{4})/;';
const evalMulti = evaluateTransformed(codeMulti);

const multiMatch1 = evalMulti.re.exec('2024-12');
assert.ok(multiMatch1, 'first multi-group pattern should match');
assert.equal(multiMatch1.groups.year, '2024', 'multi-group year should be captured');
assert.equal(multiMatch1.groups.month, '12', 'multi-group month should be captured');

const multiMatch2 = evalMulti.re.exec('12-2024');
assert.ok(multiMatch2, 'second multi-group pattern should match');
assert.equal(multiMatch2.groups.year, '2024', 'multi-group year should be captured');
assert.equal(multiMatch2.groups.month, '12', 'multi-group month should be captured');

// 6. transformed regex supports string replacement using named capture group syntax
const replaced1 = '2024-08'.replace(evalSingle.re, 'Year: $<year>');
assert.equal(replaced1, 'Year: 2024', 'replacement string should substitute $<year>');

const replaced2 = '08-2024'.replace(evalSingle.re, 'Year: $<year>');
assert.equal(replaced2, 'Year: 2024', 'replacement string should substitute $<year>');

// 7. transformed regex supports function replacement receiving named capture groups
let captured = null;
'2024-08'.replace(evalSingle.re, (...args) => {
  const groups = args[args.length - 1];
  captured = groups.year;
  return 'replaced';
});
assert.equal(captured, '2024', 'replacement function should receive groups object');

// 8. plugin leaves regular expressions without duplicate named capturing groups untouched
const codePlain = 'var re = /(?<year>[0-9]{4})-[0-9]{2}/;';
const resPlain = transformCode(codePlain);
assert.ok(!resPlain.code.includes('_wrapRegExp'), 'regex without duplicate group names must not be wrapped');

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

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