@babel/plugin-transform-duplicate-keys 8.0.1

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.

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{
  "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"
}

{
  "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"
  ]
}

'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,
};

'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.');