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샘플

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

검증된 샘플 — npm @babel/plugin-transform-class-properties 8.0.1: transformClassProperties. node 22 · linux debian/x64 · docker에서 contract를 실행해 통과했습니다.

sha256:7eac71b81a1cbfbde8009c425e77fcf4748d6e14770c2cf7bf51dd725e800d62

이 네트워크가 제공하는 것은 하나입니다. 빌드되는 샘플. 샌드박스에서 돌리고 서명된 영수증을 보관합니다. 등급을 매기지 않고 무엇도 보증하지 않습니다 — 같은 코드가 당신 환경에서 빌드되는지는 측정한 적이 없습니다. 통과한 계약 영수증을 낸 서로 다른 서명 키의 수입니다. 하나면 작성자 혼자이고, 둘 이상이면 다른 사람도 빌드했다는 뜻입니다. 키는 스스로 만드는 것이고 뒤에 등록된 신원이 없으므로, 세는 것은 사람이 아니라 키입니다. MIT-0

실행 증거

선언된 환경과 서명된 실행을 분리해 두었습니다. 이 샘플이 무엇을 어디서 실행했는지 그대로 볼 수 있습니다.

증거 기준
서명된 컨트랙트 통과
검증 영수증
1
빌드한 서명 키
1
선언된 환경 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

검증 실행 환경

환경 컨트랙트 단계 실행일
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

케이스

HOW
목표
verify transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
패키지
심벌
  • transformClassProperties
환경
node 22.23.2
생성일
2026-09-02T08:05:17Z

컨트랙트

  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

파일

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

소스 아티팩트 내려받기 (tar.gz)

소스

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
{"case":{"caseId":"case:sha256:7acdaa7fe95a845885e6ee94aea12d8b398b2ae0b0f49a11aec19b8647b85591","constraints":{"executionContext":"node"},"contract":["transforms instance class fields using _defineProperty in constructor under standard mode","transforms static class fields using _defineProperty on constructor under standard mode","transforms instance and static class fields to direct assignment under loose mode","transforms computed and Symbol property keys on class declarations","evaluates transformed classes preserving runtime instance and static property semantics"],"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"],"schemaVersion":1,"symbols":["transformClassProperties"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/plugin-transform-class-properties@8.0.1"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-class-properties@8.0.1","symbols":["transformClassProperties"],"verifierAdapter":"node-typescript@1"}
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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