@babel/plugin-transform-duplicate-keys 7.29.7

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@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-duplicate-keys@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": "verify-babel-plugin-transform-duplicate-keys",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-duplicate-keys": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-duplicate-keys@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-duplicate-keys@7.29.7"
  ]
}

import duplicateKeysPlugin from '@babel/plugin-transform-duplicate-keys';

/**
 * Creates and initializes the duplicate-keys plugin instance.
 * @param {object} [api] - Optional Babel API object.
 * @param {object} [options] - Optional plugin options.
 * @returns {object} Plugin instance object with name and visitor.
 */
export function createDuplicateKeysPlugin(api, options = {}) {
  const plugin = duplicateKeysPlugin.default || duplicateKeysPlugin;
  const babelApi = api || {
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options);
}

/**
 * Transforms an ObjectExpression AST path using the duplicate-keys visitor.
 * @param {object} pluginInstance - Plugin instance returned by createDuplicateKeysPlugin.
 * @param {object} path - Mock or real Babel AST path for ObjectExpression.
 */
export function applyDuplicateKeysTransform(pluginInstance, path) {
  if (pluginInstance.visitor && typeof pluginInstance.visitor.ObjectExpression === 'function') {
    pluginInstance.visitor.ObjectExpression(path);
  }
}

import assert from 'node:assert/strict';
import duplicateKeysPlugin from '@babel/plugin-transform-duplicate-keys';
import { createDuplicateKeysPlugin, applyDuplicateKeysTransform } from '../src/index.mjs';

// 1. Verify default export is the plugin factory function
const plugin = duplicateKeysPlugin.default || duplicateKeysPlugin;
assert.equal(typeof plugin, 'function', 'Default export must be a plugin factory function');

// 2. Verify assertVersion check and plugin structure
let assertedVersion = null;
const mockApi = {
  assertVersion(version) {
    assertedVersion = version;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersion, 7, 'Plugin must assert Babel version 7 compatibility');
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-duplicate-keys', 'Plugin name must be transform-duplicate-keys');
assert.equal(typeof instance.visitor, 'object', 'Plugin must provide a visitor object');
assert.equal(typeof instance.visitor.ObjectExpression, 'function', 'Visitor must provide ObjectExpression method');

// Helper to construct a mock ObjectProperty
function createMockProperty(nameOrValue, isIdentifier = true, kind = 'init', computed = false) {
  return {
    type: 'ObjectProperty',
    key: isIdentifier
      ? { type: 'Identifier', name: nameOrValue }
      : { type: 'StringLiteral', value: String(nameOrValue) },
    value: { type: 'NumericLiteral', value: 1 },
    computed,
    kind
  };
}

// 3. Verify ObjectExpression visitor marks duplicate data properties as computed string literals
{
  const prop1 = createMockProperty('a', true, 'init');
  const prop2 = createMockProperty('a', true, 'init');
  const prop3 = createMockProperty('b', true, 'init');

  const path = {
    node: {
      type: 'ObjectExpression',
      properties: [prop1, prop2, prop3]
    }
  };

  instance.visitor.ObjectExpression(path);

  assert.equal(prop1.computed, false, 'First property must not be marked computed');
  assert.equal(prop2.computed, true, 'Duplicate property must be marked computed');
  assert.equal(prop2.key.type, 'StringLiteral', 'Duplicate property key must be transformed to StringLiteral');
  assert.equal(prop2.key.value, 'a', 'Duplicate property key value must match original name');
  assert.equal(prop3.computed, false, 'Unique property must not be marked computed');
}

// 4. Verify string literal duplicate keys
{
  const prop1 = createMockProperty('foo', false, 'init');
  const prop2 = createMockProperty('foo', false, 'init');

  const path = {
    node: {
      type: 'ObjectExpression',
      properties: [prop1, prop2]
    }
  };

  instance.visitor.ObjectExpression(path);

  assert.equal(prop1.computed, false, 'First string literal property must remain uncomputed');
  assert.equal(prop2.computed, true, 'Second string literal property must be marked computed');
  assert.equal(prop2.key.type, 'StringLiteral');
  assert.equal(prop2.key.value, 'foo');
}

// 5. Verify ObjectExpression visitor detects duplicates across getters, setters, and data properties
{
  // Test duplicate getters
  const get1 = createMockProperty('size', true, 'get');
  const get2 = createMockProperty('size', true, 'get');
  const getPath = {
    node: {
      type: 'ObjectExpression',
      properties: [get1, get2]
    }
  };
  instance.visitor.ObjectExpression(getPath);
  assert.equal(get1.computed, false);
  assert.equal(get2.computed, true);
  assert.equal(get2.key.type, 'StringLiteral');
  assert.equal(get2.key.value, 'size');

  // Test getter + setter (valid pair, not duplicate)
  const getProp = createMockProperty('count', true, 'get');
  const setProp = createMockProperty('count', true, 'set');
  const getterSetterPath = {
    node: {
      type: 'ObjectExpression',
      properties: [getProp, setProp]
    }
  };
  instance.visitor.ObjectExpression(getterSetterPath);
  assert.equal(getProp.computed, false, 'Getter in get/set pair must not be duplicate');
  assert.equal(setProp.computed, false, 'Setter in get/set pair must not be duplicate');

  // Test getter followed by data property (conflict -> duplicate)
  const getProp2 = createMockProperty('total', true, 'get');
  const dataProp2 = createMockProperty('total', true, 'init');
  const conflictPath = {
    node: {
      type: 'ObjectExpression',
      properties: [getProp2, dataProp2]
    }
  };
  instance.visitor.ObjectExpression(conflictPath);
  assert.equal(getProp2.computed, false);
  assert.equal(dataProp2.computed, true);
  assert.equal(dataProp2.key.value, 'total');
}

// 6. Verify ObjectExpression visitor ignores spread elements and already computed properties
{
  const spreadNode = {
    type: 'SpreadElement',
    argument: { type: 'Identifier', name: 'rest' }
  };
  const computedProp = {
    type: 'ObjectProperty',
    key: { type: 'Identifier', name: 'dynamicKey' },
    value: { type: 'NumericLiteral', value: 42 },
    computed: true,
    kind: 'init'
  };
  const normalProp = createMockProperty('staticKey', true, 'init');

  const path = {
    node: {
      type: 'ObjectExpression',
      properties: [spreadNode, computedProp, normalProp]
    }
  };

  instance.visitor.ObjectExpression(path);
  assert.equal(normalProp.computed, false, 'Static property must remain unchanged');
  assert.equal(computedProp.computed, true, 'Computed property must remain unchanged');
}

// 7. Verify helper functions from src/index.mjs
{
  const helperInstance = createDuplicateKeysPlugin();
  assert.equal(helperInstance.name, 'transform-duplicate-keys');

  const propA1 = createMockProperty('x', true, 'init');
  const propA2 = createMockProperty('x', true, 'init');
  const helperPath = {
    node: {
      type: 'ObjectExpression',
      properties: [propA1, propA2]
    }
  };

  applyDuplicateKeysTransform(helperInstance, helperPath);
  assert.equal(propA1.computed, false);
  assert.equal(propA2.computed, true);
  assert.equal(propA2.key.value, 'x');
}

console.log('Contract assertions passed.');