CodeSampleX

Ejemplo

@babel/plugin-transform-class-properties 8.0.1: transformClassProperties

Muestra verificada para npm @babel/plugin-transform-class-properties 8.0.1: transformClassProperties. El contrato se ejecutó en node 22 · linux debian/x64 …

sha256:7eac71b81a1cbfbde8009c425e77fcf4748d6e14770c2cf7bf51dd725e800d62

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-02

Caso

HOW
Objetivo
verify transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
Paquetes
Símbolos
  • transformClassProperties
Entorno
node 22.23.2
Creado
2026-09-02T08:05:17Z

Contrato

  1. transforms instance class fields using _defineProperty in constructor under standard mode
  2. transforms static class fields using _defineProperty on constructor under standard mode
  3. transforms instance and static class fields to direct assignment under loose mode
  4. transforms computed and Symbol property keys on class declarations
  5. evaluates transformed classes preserving runtime instance and static property semantics

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 transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
Demonstrate these symbols/APIs:
  - transformClassProperties
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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-transform-class-properties",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "@babel/core": "8.0.1",
    "@babel/plugin-transform-class-properties": "8.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-class-properties@8.0.1"
  ],
  "symbols": [
    "transformClassProperties"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import { transformSync } from '@babel/core';
import transformClassPropertiesPlugin from '@babel/plugin-transform-class-properties';

const plugin = transformClassPropertiesPlugin.default || transformClassPropertiesPlugin;

/**
 * Transforms class properties in JavaScript code using @babel/plugin-transform-class-properties.
 *
 * @param {string} code - Source code containing class property definitions.
 * @param {object} [options={}] - Transformation options.
 * @param {boolean} [options.loose=false] - Whether to transform properties in loose mode.
 * @returns {string} The transformed JavaScript code.
 */
export function compileClassProperties(code, options = {}) {
  const pluginConfig = options.loose !== undefined
    ? [plugin, { loose: options.loose }]
    : [plugin];

  const result = transformSync(code, {
    plugins: [pluginConfig],
    configFile: false,
    babelrc: false,
  });

  return result?.code ?? '';
}

export default plugin;
test/contract.mjs
import assert from 'node:assert';
import plugin, { compileClassProperties } from '../src/index.mjs';

// 1. transforms instance class fields using _defineProperty in constructor under standard mode
{
  const source = `
class Counter {
  count = 0;
  increment = () => {
    this.count += 1;
  };
}
`;
  const output = compileClassProperties(source);
  assert.strictEqual(output.includes('_defineProperty(this, "count", 0)'), true);
  assert.strictEqual(output.includes('_defineProperty(this, "increment"'), true);
}

// 2. transforms static class fields using _defineProperty on constructor under standard mode
{
  const source = `
class AppConfig {
  static version = '2.0.0';
  static maxRetries = 3;
}
`;
  const output = compileClassProperties(source);
  assert.strictEqual(output.includes('_defineProperty(AppConfig, "version", "2.0.0")') || output.includes("_defineProperty(AppConfig, \"version\", '2.0.0')"), true);
  assert.strictEqual(output.includes('_defineProperty(AppConfig, "maxRetries", 3)'), true);
}

// 3. transforms instance and static class fields to direct assignment under loose mode
{
  const source = `
class User {
  name = 'Anonymous';
  static role = 'guest';
}
`;
  const output = compileClassProperties(source, { loose: true });
  assert.strictEqual(output.includes('_defineProperty'), false);
  assert.strictEqual(output.includes("this.name = 'Anonymous'"), true);
  assert.strictEqual(output.includes("User.role = 'guest'"), true);
}

// 4. transforms computed and Symbol property keys on class declarations
{
  const source = `
const symId = Symbol('id');
class Entity {
  [symId] = 'E-100';
  static ['category'] = 'general';
}
`;
  const output = compileClassProperties(source);
  assert.strictEqual(output.includes('_defineProperty(this, symId, "E-100")') || output.includes("_defineProperty(this, symId, 'E-100')"), true);
  assert.strictEqual(output.includes('_defineProperty(Entity, "category", "general")') || output.includes("_defineProperty(Entity, 'category', 'general')") || output.includes("_defineProperty(Entity, \"category\", 'general')"), true);
}

// 5. evaluates transformed classes preserving runtime instance and static property semantics
{
  const source = `
class MathService {
  multiplier = 2;
  static defaultBase = 10;

  calculate(val) {
    return (val + MathService.defaultBase) * this.multiplier;
  }
}
`;
  const output = compileClassProperties(source);
  const factory = new Function(output + '\nreturn MathService;');
  const MathService = factory();

  assert.strictEqual(MathService.defaultBase, 10);
  const service = new MathService();
  assert.strictEqual(service.multiplier, 2);
  assert.strictEqual(service.calculate(5), 30);
}

console.log('Contract tests passed successfully.');

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