CodeSampleX

Exemplo

@babel/plugin-transform-class-properties 7.29.7

Amostra verificada para npm @babel/plugin-transform-class-properties 7.29.7. O contrato rodou em node 22 · linux alpine/x64 · docker e passou.

sha256:1423a35b1039a868ee0680b9c8ed7e55056cf3b4efca1929d36a97ed7a08d531

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
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
Pacotes
Criado
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

Arquivos

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

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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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