CodeSampleX

Exemple

@babel/plugin-transform-duplicate-keys 8.0.1

Échantillon vérifié pour npm @babel/plugin-transform-duplicate-keys 8.0.1. Le contrat s'est exécuté sur node 22 · linux alpine/x64 · docker et a réussi.

sha256:787c1570fc7ed0208a43db0520c6ae961e3ad2747e57ba9be5b02c893add9173

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

Preuves d'exécution

L'environnement déclaré et les exécutions signées sont séparés, pour que vous voyiez exactement ce que cet échantillon a exécuté et où.

Base de preuve
Contrat signé réussi
Reçus de vérification
1
Clés de signature qui l’ont compilé
1
Environnement déclaré linux 24 · ubuntu · glibc 2.39 x64 npm

Environnements des exécutions de vérification

Environnement Contrat Étapes Exécution
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

Cas

HOW
Objectif
verify pkg:npm/%40babel/plugin-transform-duplicate-keys@8.0.1
Paquets
Créé
2026-08-20T17:46:23Z

Contrat

  1. assert @babel/plugin-transform-duplicate-keys exports a Babel plugin factory function
  2. assert duplicate identifier keys in object literals are transformed to computed string property keys
  3. assert duplicate string literal keys and matching identifier keys are transformed to computed keys
  4. assert duplicate numeric literal keys and matching string keys are normalized and transformed to computed keys
  5. assert getter and setter properties with duplicate keys are transformed into computed getters or properties
  6. assert multiple successive duplicate keys in object literals and nested objects are all transformed into computed keys
  7. assert non-duplicate object properties remain untransformed standard properties

Fichiers

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.js

Télécharger l’artefact source (tar.gz)

Code 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-keys@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-duplicate-keys@8.0.1

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-keys",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for @babel/plugin-transform-duplicate-keys",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/plugin-transform-duplicate-keys": "8.0.1"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-duplicate-keys@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-duplicate-keys@8.0.1"
  ]
}
src/index.js
'use strict';

const transformDuplicateKeys = require('@babel/plugin-transform-duplicate-keys');
const babel = require('@babel/core');

/**
 * Transforms JavaScript code using the duplicate-keys transform plugin.
 *
 * @param {string} sourceCode - The input JavaScript source code.
 * @param {object} [options] - Options passed to the plugin.
 * @returns {string} The transformed JavaScript code.
 */
function transformDuplicateKeysCode(sourceCode, options = {}) {
  const result = babel.transformSync(sourceCode, {
    plugins: [[transformDuplicateKeys, options]],
    configFile: false,
    babelrc: false,
  });
  return result ? result.code : '';
}

/**
 * Transforms and executes JavaScript code containing object definitions with duplicate keys.
 *
 * @param {string} sourceCode - JavaScript snippet that assigns results to variable `output`.
 * @param {object} [options] - Plugin options.
 * @returns {*} The evaluated output value.
 */
function evaluateDuplicateKeys(sourceCode, options = {}) {
  const transformed = transformDuplicateKeysCode(sourceCode, options);
  let output;
  eval(transformed);
  return output;
}

module.exports = {
  transformDuplicateKeys,
  transformDuplicateKeysCode,
  evaluateDuplicateKeys,
};
test/contract.js
'use strict';

const assert = require('node:assert/strict');
const transformDuplicateKeys = require('@babel/plugin-transform-duplicate-keys');
const {
  transformDuplicateKeysCode,
  evaluateDuplicateKeys,
} = require('../src/index.js');

// Contract 1: assert @babel/plugin-transform-duplicate-keys exports a Babel plugin factory function
{
  assert.strictEqual(typeof transformDuplicateKeys, 'object', 'Plugin module should be an object');
  assert.strictEqual(typeof transformDuplicateKeys.default, 'function', 'Plugin default export should be a function');
}

// Contract 2: assert duplicate identifier keys in object literals are transformed to computed string property keys
{
  const code = 'output = { a: 10, a: 20 };';
  const transformed = transformDuplicateKeysCode(code);
  assert.ok(transformed.includes('["a"]'), 'Second duplicate key "a" should be transformed to computed property ["a"]');
  const result = evaluateDuplicateKeys(code);
  assert.deepStrictEqual(result, { a: 20 }, 'Evaluated object should retain the value of the overridden property');
}

// Contract 3: assert duplicate string literal keys and matching identifier keys are transformed to computed keys
{
  const code = 'output = { "key-name": "first", "key-name": "second", title: "old", "title": "new" };';
  const transformed = transformDuplicateKeysCode(code);
  assert.ok(transformed.includes('["key-name"]'), 'Duplicate string key should be transformed to computed property');
  assert.ok(transformed.includes('["title"]'), 'Duplicate identifier-string key collision should be transformed to computed property');
  const result = evaluateDuplicateKeys(code);
  assert.deepStrictEqual(result, { 'key-name': 'second', title: 'new' });
}

// Contract 4: assert duplicate numeric literal keys and matching string keys are normalized and transformed to computed keys
{
  const code = 'output = { 42: "num", "42": "str", 100: "first", 100: "second" };';
  const transformed = transformDuplicateKeysCode(code);
  assert.ok(transformed.includes('["42"]'), 'Duplicate numeric/string key should be transformed to computed property');
  assert.ok(transformed.includes('["100"]'), 'Duplicate numeric literal should be transformed to computed property');
  const result = evaluateDuplicateKeys(code);
  assert.deepStrictEqual(result, { 42: 'str', 100: 'second' });
}

// Contract 5: assert getter and setter properties with duplicate keys are transformed into computed getters or properties
{
  const getterCode = `
    output = {
      get value() { return 100; },
      value: 200
    };
  `;
  const transformedGetter = transformDuplicateKeysCode(getterCode);
  assert.ok(transformedGetter.includes('["value"]'), 'Value property after getter should be transformed to computed key');
  const resultGetter = evaluateDuplicateKeys(getterCode);
  assert.strictEqual(resultGetter.value, 200);

  const twoGettersCode = `
    output = {
      get item() { return "v1"; },
      get item() { return "v2"; }
    };
  `;
  const transformedTwoGetters = transformDuplicateKeysCode(twoGettersCode);
  assert.ok(transformedTwoGetters.includes('get ["item"]'), 'Subsequent getter should be transformed to computed getter');
  const resultTwoGetters = evaluateDuplicateKeys(twoGettersCode);
  assert.strictEqual(resultTwoGetters.item, 'v2');
}

// Contract 6: assert multiple successive duplicate keys in object literals and nested objects are all transformed into computed keys
{
  const code = `
    output = {
      val: 1,
      val: 2,
      val: 3,
      nested: {
        x: 'a',
        x: 'b'
      }
    };
  `;
  const transformed = transformDuplicateKeysCode(code);
  const occurrences = transformed.split('["val"]').length - 1;
  assert.strictEqual(occurrences, 2, 'Should transform each subsequent duplicate of val into computed properties');
  assert.ok(transformed.includes('["x"]'), 'Nested object duplicate keys should be transformed');
  const result = evaluateDuplicateKeys(code);
  assert.deepStrictEqual(result, {
    val: 3,
    nested: { x: 'b' },
  });
}

// Contract 7: assert non-duplicate object properties remain untransformed standard properties
{
  const code = 'output = { alpha: 1, beta: 2, gamma: 3 };';
  const transformed = transformDuplicateKeysCode(code);
  assert.ok(!transformed.includes('['), 'Non-duplicate properties should not have computed keys');
  const result = evaluateDuplicateKeys(code);
  assert.deepStrictEqual(result, { alpha: 1, beta: 2, gamma: 3 });
}

console.log('All @babel/plugin-transform-duplicate-keys contract assertions passed.');

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