CodeSampleX

Ejemplo

@babel/plugin-transform-class-properties 7.29.7

Muestra verificada para npm @babel/plugin-transform-class-properties 7.29.7. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:1423a35b1039a868ee0680b9c8ed7e55056cf3b4efca1929d36a97ed7a08d531

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-21

Caso

HOW
Objetivo
verify pkg:npm/%40babel/plugin-transform-class-properties@7.29.7
Paquetes
Creado
2026-08-21T06:38:15Z

Contrato

  1. Plugin default export is a function factory asserting Babel version compatibility
  2. Plugin factory returns an object named transform-class-properties with manipulateOptions, pre, and visitor
  3. manipulateOptions adds classProperties and classPrivateProperties to parser plugins array
  4. Plugin accepts options including loose mode configuration
  5. Visitor provides Class and ExportDefaultDeclaration visitor methods for AST transformation
  6. Module helpers instantiate the plugin, configure parser options, and extract visitors

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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-class-properties@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-class-properties@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.
csx.json
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package-lock.json
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package.json
{
  "name": "sample-babel-plugin-transform-class-properties",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-class-properties": "7.29.7"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-class-properties@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-class-properties@7.29.7"
  ]
}
src/index.mjs
import classPropertiesPlugin from '@babel/plugin-transform-class-properties';

/**
 * Creates and initializes the transform-class-properties plugin instance.
 * @param {object} [api] - Babel API mock or instance with assertVersion.
 * @param {object} [options] - Plugin options such as { loose: boolean }.
 * @returns {object} Plugin instance object with name, manipulateOptions, pre, and visitor.
 */
export function createClassPropertiesPlugin(api, options = {}) {
  const plugin = classPropertiesPlugin.default || classPropertiesPlugin;
  const babelApi = api || {
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options);
}

/**
 * Applies class properties options manipulation to Babel parser options.
 * @param {object} pluginInstance - The plugin instance returned by createClassPropertiesPlugin.
 * @param {object} [parserOpts] - Parser options object containing plugins array.
 * @returns {{ parserPlugins: Array }}
 */
export function applyClassPropertiesParserOptions(pluginInstance, parserOpts = { plugins: [] }) {
  if (typeof pluginInstance.manipulateOptions === 'function') {
    pluginInstance.manipulateOptions({}, parserOpts);
  }
  return {
    parserPlugins: parserOpts.plugins
  };
}

/**
 * Retrieves the AST visitor from the plugin instance.
 * @param {object} pluginInstance - The plugin instance returned by createClassPropertiesPlugin.
 * @returns {object} The visitor object containing AST node visitor methods.
 */
export function getClassPropertiesVisitor(pluginInstance) {
  return pluginInstance.visitor || {};
}
test/contract.mjs
import assert from 'node:assert/strict';
import classPropertiesPlugin from '@babel/plugin-transform-class-properties';
import {
  createClassPropertiesPlugin,
  applyClassPropertiesParserOptions,
  getClassPropertiesVisitor
} from '../src/index.mjs';

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

// 2. Verify assertVersion check and returned plugin structure
let assertedVersionRange = null;
const mockApi = {
  assertVersion(range) {
    assertedVersionRange = range;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersionRange, '^7.0.0-0 || ^8.0.0-0', 'Plugin must assert Babel version range');
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-class-properties', 'Plugin name must be transform-class-properties');
assert.equal(typeof instance.manipulateOptions, 'function', 'Plugin must provide manipulateOptions function');
assert.equal(typeof instance.pre, 'function', 'Plugin must provide pre function');
assert.equal(typeof instance.visitor, 'object', 'Plugin must provide visitor object');
assert.equal(typeof instance.visitor.Class, 'function', 'Visitor must provide Class method');
assert.equal(typeof instance.visitor.ExportDefaultDeclaration, 'function', 'Visitor must provide ExportDefaultDeclaration method');

// 3. Verify manipulateOptions adds classProperties and classPrivateProperties plugins
const parserOpts1 = { plugins: [] };
instance.manipulateOptions({}, parserOpts1);
assert.deepEqual(
  parserOpts1.plugins,
  ['classProperties', 'classPrivateProperties'],
  'manipulateOptions must add classProperties and classPrivateProperties to parser plugins'
);

// 4. Verify manipulateOptions preserves existing parser plugins
const parserOpts2 = { plugins: ['jsx'] };
instance.manipulateOptions({}, parserOpts2);
assert.deepEqual(
  parserOpts2.plugins,
  ['jsx', 'classProperties', 'classPrivateProperties'],
  'manipulateOptions must preserve existing parser plugins'
);

// 5. Verify loose option configuration
const instanceLoose = plugin(mockApi, { loose: true });
assert.equal(instanceLoose.name, 'transform-class-properties');
assert.equal(typeof instanceLoose.visitor, 'object');
assert.equal(typeof instanceLoose.visitor.Class, 'function');

const instanceNonLoose = plugin(mockApi, { loose: false });
assert.equal(instanceNonLoose.name, 'transform-class-properties');
assert.equal(typeof instanceNonLoose.visitor, 'object');
assert.equal(typeof instanceNonLoose.visitor.Class, 'function');

// 6. Verify helper functions from src/index.mjs
const helperInstance = createClassPropertiesPlugin();
assert.equal(helperInstance.name, 'transform-class-properties');

const helperParserResult = applyClassPropertiesParserOptions(helperInstance);
assert.deepEqual(helperParserResult.parserPlugins, ['classProperties', 'classPrivateProperties']);

const visitor = getClassPropertiesVisitor(helperInstance);
assert.equal(typeof visitor.Class, 'function');
assert.equal(typeof visitor.ExportDefaultDeclaration, 'function');

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

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