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샘플

@babel/plugin-transform-class-properties 8.0.1

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

sha256:24ae386dfcb3486e1bca06b889f35aa09808fb6fa95d77945f7eff5aeab0367a

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 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

케이스

HOW
목표
verify pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
패키지
환경
node 22.23.2
생성일
2026-08-27T20:44:46Z

컨트랙트

  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

파일

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

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 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
{"case":{"caseId":"case:sha256:02391b897de4e6ca8ba4d7b9e103e6d754e761c17189c8744bea4e6494e3dd06","constraints":{"executionContext":"node"},"contract":["assert @babel/plugin-transform-class-properties exports a Babel plugin factory function","assert instance field initializers are transformed to constructor property assignments in loose mode","assert instance field initializers are transformed using defineProperty helper in standard mode","assert static class fields are transformed to external property assignments after class declaration","assert private instance fields are transformed using WeakMap in standard mode and unique symbols or keys in loose mode","assert computed field keys and field initializers preserve evaluation order and instance scope","assert compiler assumptions such as setPublicClassFields control field assignment behavior"],"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"],"schemaVersion":1},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","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","verifierAdapter":"node-typescript@1"}
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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