CodeSampleX

Ejemplo

@babel/plugin-transform-class-properties 8.0.1

Muestra verificada para npm @babel/plugin-transform-class-properties 8.0.1. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:24ae386dfcb3486e1bca06b889f35aa09808fb6fa95d77945f7eff5aeab0367a

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 alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Caso

HOW
Objetivo
verify pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
Paquetes
Entorno
node 22.23.2
Creado
2026-08-27T20:44:46Z

Contrato

  1. assert @babel/plugin-transform-class-properties exports a Babel plugin factory function
  2. assert instance field initializers are transformed to constructor property assignments in loose mode
  3. assert instance field initializers are transformed using defineProperty helper in standard mode
  4. assert static class fields are transformed to external property assignments after class declaration
  5. assert private instance fields are transformed using WeakMap in standard mode and unique symbols or keys in loose mode
  6. assert computed field keys and field initializers preserve evaluation order and instance scope
  7. assert compiler assumptions such as setPublicClassFields control field assignment behavior

Archivos

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

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@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
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-plugin-transform-class-properties",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for @babel/plugin-transform-class-properties",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/plugin-transform-class-properties": "8.0.1"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-class-properties@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-class-properties@8.0.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.js
'use strict';

const classPropertiesPluginModule = require('@babel/plugin-transform-class-properties');
const babel = require('@babel/core');

const transformClassProperties =
  typeof classPropertiesPluginModule === 'function'
    ? classPropertiesPluginModule
    : classPropertiesPluginModule.default || classPropertiesPluginModule;

/**
 * Instantiates the class properties plugin with the provided Babel API and options.
 *
 * @param {object} [api] - Mock or real Babel API object.
 * @param {object} [options] - Plugin configuration options.
 * @returns {object} The Babel plugin instance.
 */
function instantiatePlugin(api = {}, options = {}) {
  const normalizedApi = {
    assertVersion: (range) => {
      if (typeof api.assertVersion === 'function') {
        api.assertVersion(range);
      }
    },
    assumption: (name) => {
      if (typeof api.assumption === 'function') {
        return api.assumption(name);
      }
      return undefined;
    },
    ...api,
  };
  return transformClassProperties(normalizedApi, options);
}

/**
 * Transforms JavaScript code using @babel/plugin-transform-class-properties.
 *
 * @param {string} sourceCode - Input JavaScript code string.
 * @param {object} [options] - Plugin configuration options.
 * @param {object} [assumptions] - Compiler assumptions.
 * @returns {string} Transformed JavaScript code string.
 */
function transformClassPropertiesCode(sourceCode, options = {}, assumptions = {}) {
  const result = babel.transformSync(sourceCode, {
    plugins: [[transformClassProperties, options]],
    assumptions,
    configFile: false,
    babelrc: false,
  });
  return result ? result.code : '';
}

/**
 * Evaluates JavaScript code transformed by the plugin and returns the evaluation output.
 *
 * @param {string} sourceCode - JavaScript snippet that sets the `output` variable.
 * @param {object} [options] - Plugin configuration options.
 * @param {object} [assumptions] - Compiler assumptions.
 * @returns {*} Evaluated result.
 */
function evaluateTransformedCode(sourceCode, options = {}, assumptions = {}) {
  const transformed = transformClassPropertiesCode(sourceCode, options, assumptions);
  let output;
  eval(transformed);
  return output;
}

module.exports = {
  transformClassProperties,
  instantiatePlugin,
  transformClassPropertiesCode,
  evaluateTransformedCode,
};
test/contract.js
'use strict';

const assert = require('node:assert/strict');
const classPropertiesPluginModule = require('@babel/plugin-transform-class-properties');
const {
  transformClassProperties,
  instantiatePlugin,
  transformClassPropertiesCode,
  evaluateTransformedCode,
} = require('../src/index.js');

// Contract 1: assert @babel/plugin-transform-class-properties exports a Babel plugin factory function
{
  assert.strictEqual(typeof transformClassProperties, 'function', 'Plugin factory should be a function');
  let assertedRange = null;
  const mockApi = {
    assertVersion: (range) => {
      assertedRange = range;
    },
    assumption: () => undefined,
  };
  const pluginInstance = instantiatePlugin(mockApi, {});
  assert.strictEqual(pluginInstance.name, 'transform-class-properties');
  assert.ok(pluginInstance.visitor);
  assert.strictEqual(typeof pluginInstance.visitor.Class, 'function');
  assert.strictEqual(assertedRange, '^7.0.0-0 || ^8.0.0');
}

// Contract 2: assert instance field initializers are transformed to constructor property assignments in loose mode
{
  const code = `
    class User {
      name = "Alice";
      role = "admin";
      constructor(customRole) {
        if (customRole) {
          this.role = customRole;
        }
      }
    }
    const u1 = new User();
    const u2 = new User("guest");
    output = { u1Name: u1.name, u1Role: u1.role, u2Name: u2.name, u2Role: u2.role };
  `;
  const transformed = transformClassPropertiesCode(code, { loose: true });
  assert.ok(transformed.includes('this.name = "Alice"'), 'Loose mode should assign directly in constructor');
  assert.ok(transformed.includes('this.role = "admin"'), 'Loose mode should assign directly in constructor');
  const result = evaluateTransformedCode(code, { loose: true });
  assert.deepStrictEqual(result, {
    u1Name: 'Alice',
    u1Role: 'admin',
    u2Name: 'Alice',
    u2Role: 'guest',
  });
}

// Contract 3: assert instance field initializers are transformed using defineProperty helper in standard mode
{
  const code = `
    class Box {
      width = 100;
      height = 50;
    }
    const box = new Box();
    output = { width: box.width, height: box.height };
  `;
  const transformed = transformClassPropertiesCode(code, { loose: false });
  assert.ok(transformed.includes('_defineProperty(this, "width", 100)'), 'Standard mode should use _defineProperty helper');
  assert.ok(transformed.includes('_defineProperty(this, "height", 50)'), 'Standard mode should use _defineProperty helper');
  const result = evaluateTransformedCode(code, { loose: false });
  assert.deepStrictEqual(result, { width: 100, height: 50 });
}

// Contract 4: assert static class fields are transformed to external property assignments after class declaration
{
  const code = `
    class Counter {
      static defaultStep = 5;
      static prefix = "count_";
    }
    output = { step: Counter.defaultStep, prefix: Counter.prefix };
  `;
  const transformedLoose = transformClassPropertiesCode(code, { loose: true });
  assert.ok(transformedLoose.includes('Counter.defaultStep = 5'), 'Static property should be assigned to class in loose mode');
  assert.ok(transformedLoose.includes('Counter.prefix = "count_"'), 'Static property should be assigned to class in loose mode');
  const result = evaluateTransformedCode(code, { loose: true });
  assert.deepStrictEqual(result, { step: 5, prefix: 'count_' });
}

// Contract 5: assert private instance fields are transformed using WeakMap in standard mode and unique symbols or keys in loose mode
{
  const code = `
    class Account {
      #balance = 1000;
      deposit(amount) {
        this.#balance += amount;
      }
      getBalance() {
        return this.#balance;
      }
    }
    const acc = new Account();
    acc.deposit(250);
    output = { balance: acc.getBalance() };
  `;

  // Standard mode uses WeakMap
  const transformedStandard = transformClassPropertiesCode(code, { loose: false });
  assert.ok(transformedStandard.includes('new WeakMap()'), 'Standard mode should use WeakMap for private fields');
  const resultStandard = evaluateTransformedCode(code, { loose: false });
  assert.deepStrictEqual(resultStandard, { balance: 1250 });

  // Loose mode uses private key identifier
  const transformedLoose = transformClassPropertiesCode(code, { loose: true });
  assert.ok(transformedLoose.includes('_classPrivateFieldLooseKey'), 'Loose mode should use loose key helper');
  const resultLoose = evaluateTransformedCode(code, { loose: true });
  assert.deepStrictEqual(resultLoose, { balance: 1250 });
}

// Contract 6: assert computed field keys and field initializers preserve evaluation order and instance scope
{
  const code = `
    let log = [];
    function computeKey(name) {
      log.push('key:' + name);
      return name;
    }
    function computeValue(val) {
      log.push('val:' + val);
      return val;
    }
    class Ordered {
      [computeKey('k1')] = computeValue('v1');
      [computeKey('k2')] = computeValue('v2');
    }
    log.push('class_defined');
    const obj = new Ordered();
    output = { log, objK1: obj.k1, objK2: obj.k2 };
  `;
  const result = evaluateTransformedCode(code, { loose: true });
  assert.deepStrictEqual(result.log, [
    'key:k1',
    'key:k2',
    'class_defined',
    'val:v1',
    'val:v2',
  ], 'Computed keys evaluate at class definition time; initializers evaluate at instantiation time');
  assert.strictEqual(result.objK1, 'v1');
  assert.strictEqual(result.objK2, 'v2');
}

// Contract 7: assert compiler assumptions such as setPublicClassFields control field assignment behavior
{
  const code = `
    class Product {
      title = "Item";
    }
  `;
  const transformedWithAssumption = transformClassPropertiesCode(code, {}, { setPublicClassFields: true });
  assert.ok(transformedWithAssumption.includes('this.title = "Item"'), 'setPublicClassFields assumption should produce direct assignment');
}

console.log('All @babel/plugin-transform-class-properties contract assertions passed successfully.');

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