CodeSampleX

サンプル

@babel/plugin-transform-class-properties 8.0.1

検証済みサンプル — npm @babel/plugin-transform-class-properties 8.0.1. node 22 · linux alpine/x64 · docker で contract を実行し、成功しました: assert…

sha256:24ae386dfcb3486e1bca06b889f35aa09808fb6fa95d77945f7eff5aeab0367a

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

検証実行環境

環境 コントラクト ステージ 実行日
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

ケース

HOW
ゴール
verify pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
パッケージ
環境
node 22.23.2
作成日
2026-08-27T20:44:46Z

コントラクト

  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

ファイル

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

ソースアーティファクトをダウンロード (tar.gz)

ソース

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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