@babel/plugin-transform-duplicate-named-capturing-groups-regex 7.29.7: transform duplicate named capturing groups in regular expressions with babel plugin

# Babel Plugin: `@babel/plugin-transform-duplicate-named-capturing-groups-regex`

## Prior Solutions Search

An initial search of known solutions for `@babel/plugin-transform-duplicate-named-capturing-groups-regex@7.29.7` returned `NO_SAFE_MATCH`.

## Pinned Release

- `@babel/plugin-transform-duplicate-named-capturing-groups-regex`: `7.29.7`
- `@babel/core`: `^7.26.0`
- Runtime: Node.js (`>=18`, tested on Node 22+)

## Observed Behaviour

1. **Duplicate Named Capturing Groups in Disjunctions**:
   - ES2025 regular expressions permit duplicate capturing group names across different disjunction branches (e.g. `/(?<year>\d{4})-\d{2}|\d{2}-(?<year>\d{4})/`).
   - In environments or engines lacking native support, `@babel/plugin-transform-duplicate-named-capturing-groups-regex` compiles the regex literal into standard indexed capturing groups (`/(\d{4})-\d{2}|\d{2}-(\d{4})/`) wrapped by a runtime RegExp wrapper helper (`_wrapRegExp`).

2. **Unified Named Group Resolution at Runtime**:
   - When executing `.exec(input)` on the wrapped RegExp instance, `result.groups.<name>` accurately resolves the matched substring regardless of which branch in the disjunction matched.
   - For non-matching inputs, `re.exec(input)` returns `null`.

3. **String Replacement Compatibility**:
   - `String.prototype.replace(re, "Year: $<year>")` correctly substitutes named replacement tokens using the mapped capture indices.

4. **Plugin Export**:
   - In ESM imports, the plugin exposes its transform visitor generator function as `default` (or interop object).

## Failure Mode

When running modern regexes containing duplicate group names without this transform on engines lacking ES2025 RegExp duplicate named groups support, engines throw a syntax error (`SyntaxError: Invalid regular expression: Duplicate capture group name`). Applying this plugin resolves the syntax and normalizes group extraction.

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: transform duplicate named capturing groups in regular expressions with babel plugin
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-duplicate-named-capturing-groups-regex@7.29.7

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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{
  "name": "csx-sample-babel-plugin-duplicate-named-groups",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "^7.26.0",
    "@babel/plugin-transform-duplicate-named-capturing-groups-regex": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "transform duplicate named capturing groups in regular expressions with babel plugin",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-duplicate-named-capturing-groups-regex@7.29.7"
  ]
}

import babel from '@babel/core';
import duplicateNamedGroupsPlugin from '@babel/plugin-transform-duplicate-named-capturing-groups-regex';

/**
 * Transforms JavaScript source code containing regular expressions with duplicate
 * named capturing groups in disjunctions (e.g. `/(?<year>\d{4})-\d{2}|\d{2}-(?<year>\d{4})/`)
 * into backward-compatible RegExp wrappers using @babel/plugin-transform-duplicate-named-capturing-groups-regex.
 *
 * @param {string} code - Source code string to transform.
 * @param {object} [options] - Optional Babel transform configuration.
 * @returns {string} - Transformed JavaScript source code.
 */
export function transformDuplicateNamedGroups(code, options = {}) {
  const result = babel.transformSync(code, {
    plugins: [duplicateNamedGroupsPlugin],
    configFile: false,
    babelrc: false,
    ...options,
  });
  return result ? result.code : '';
}

/**
 * Creates and compiles a regular expression with duplicate named capturing groups
 * into an executable regex object via Babel's duplicate-named-capturing-groups transform.
 *
 * @param {string} regexPatternWithDuplicateGroups - Regex pattern containing duplicate group names.
 * @param {string} [flags=''] - Optional regex flags.
 * @returns {Promise<RegExp>} - Executable regex with unified group capture support.
 */
export async function createTransformedRegExp(regexPatternWithDuplicateGroups, flags = '') {
  const wrapperCode = `export default /${regexPatternWithDuplicateGroups}/${flags};`;
  const transformed = transformDuplicateNamedGroups(wrapperCode);
  const moduleUrl = 'data:text/javascript;charset=utf-8,' + encodeURIComponent(transformed);
  const mod = await import(moduleUrl);
  return mod.default;
}

import { strict as assert } from 'node:assert';
import duplicateNamedGroupsPlugin from '@babel/plugin-transform-duplicate-named-capturing-groups-regex';
import { transformDuplicateNamedGroups, createTransformedRegExp } from '../src/index.mjs';

// 1. Verify plugin transforms duplicate named capturing groups across disjunction alternatives
const sourceCode = `
export function matchDate(input) {
  const re = /(?<year>\\d{4})-\\d{2}|\\d{2}-(?<year>\\d{4})/;
  return re.exec(input);
}
`;

const transformedCode = transformDuplicateNamedGroups(sourceCode);

// The transformed code should wrap the RegExp with index mapping
assert(transformedCode.includes('_wrapRegExp') || transformedCode.includes('BabelRegExp'));

// 2. Verify runtime execution of matched duplicate named groups for alternative branch 1 (YYYY-MM)
const moduleUrl = 'data:text/javascript;charset=utf-8,' + encodeURIComponent(transformedCode);
const mod = await import(moduleUrl);

const match1 = mod.matchDate('2026-08');
assert(match1 !== null, 'Should match YYYY-MM pattern');
assert.equal(match1.groups.year, '2026');

// 3. Verify runtime execution of matched duplicate named groups for alternative branch 2 (MM-YYYY)
const match2 = mod.matchDate('08-2026');
assert(match2 !== null, 'Should match MM-YYYY pattern');
assert.equal(match2.groups.year, '2026');

// 4. Verify non-matching strings return null
assert.equal(mod.matchDate('invalid-string'), null);

// 5. Verify String.prototype.replace with named capturing group replacement ($<year>)
const re = await createTransformedRegExp('(?<year>\\d{4})-\\d{2}|\\d{2}-(?<year>\\d{4})');
assert.equal('2026-08'.replace(re, 'Year: $<year>'), 'Year: 2026');
assert.equal('08-2026'.replace(re, 'Year: $<year>'), 'Year: 2026');

// 6. Verify direct plugin function object export structure
assert.equal(typeof duplicateNamedGroupsPlugin, 'object');
assert.equal(typeof (duplicateNamedGroupsPlugin.default || duplicateNamedGroupsPlugin), 'function');

console.log('CONTRACT PASS: @babel/plugin-transform-duplicate-named-capturing-groups-regex verified');