サンプル

@babel/plugin-transform-arrow-functions 7.29.7

検証済みサンプル — npm @babel/plugin-transform-arrow-functions 7.29.7. node 22 · linux alpine/x64 · docker で contract を実行し、成功しました: Plugin default export is a…

sha256:cc758228363ff03148c248866e238430eb24c6fadcf69abd6a965987e15283fc

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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…	2026-08-23

ケース

HOW

ゴール: verify pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7
パッケージ: @babel/plugin-transform-arrow-functions 7.29.7
作成日: 2026-08-23T07:43:14Z

コントラクト

Plugin default export is a function factory asserting Babel 7 compatibility
Plugin factory returns an object named transform-arrow-functions with ArrowFunctionExpression visitor method
ArrowFunctionExpression visitor invokes arrowFunctionToExpression with default loose options
ArrowFunctionExpression visitor enables specCompliant and disables noNewArrows when spec option is true
ArrowFunctionExpression visitor prioritizes noNewArrows compiler assumption over spec option
ArrowFunctionExpression visitor skips transformation when node is not an arrow function expression
Module helpers instantiate the plugin and execute arrow function transformations

ファイル

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

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-arrow-functions@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7

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:e2c7e003873289d78610d34d8a10a2276325726d501ef52c4a178312775384c6","contract":["Plugin default export is a function factory asserting Babel 7 compatibility","Plugin factory returns an object named transform-arrow-functions with ArrowFunctionExpression visitor method","ArrowFunctionExpression visitor invokes arrowFunctionToExpression with default loose options","ArrowFunctionExpression visitor enables specCompliant and disables noNewArrows when spec option is true","ArrowFunctionExpression visitor prioritizes noNewArrows compiler assumption over spec option","ArrowFunctionExpression visitor skips transformation when node is not an arrow function expression","Module helpers instantiate the plugin and execute arrow function transformations"],"goal":"verify pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7","verifierAdapter":"node-typescript@1"}

package-lock.json

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package.json

{
  "name": "verify-babel-plugin-transform-arrow-functions",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-arrow-functions": "7.29.7"
  }
}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-arrow-functions@7.29.7"
  ]
}

src/index.mjs

import arrowFunctionsPlugin from '@babel/plugin-transform-arrow-functions';

/**
 * Creates and initializes the arrow-functions plugin instance.
 * @param {object} [api] - Optional Babel API object.
 * @param {object} [options] - Optional plugin options (e.g. { spec: true }).
 * @returns {object} Plugin instance object with name and visitor.
 */
export function createArrowFunctionsPlugin(api, options = {}) {
  const plugin = arrowFunctionsPlugin.default || arrowFunctionsPlugin;
  const babelApi = api || {
    assertVersion: (range) => Boolean(range),
    assumption: () => undefined
  };
  return plugin(babelApi, options);
}

/**
 * Transforms an ArrowFunctionExpression AST path using the arrow-functions visitor.
 * @param {object} pluginInstance - Plugin instance returned by createArrowFunctionsPlugin.
 * @param {object} path - Mock or real Babel AST path for ArrowFunctionExpression.
 */
export function applyArrowFunctionsTransform(pluginInstance, path) {
  if (pluginInstance.visitor && typeof pluginInstance.visitor.ArrowFunctionExpression === 'function') {
    pluginInstance.visitor.ArrowFunctionExpression(path);
  }
}

test/contract.mjs

import assert from 'node:assert/strict';
import arrowFunctionsPlugin from '@babel/plugin-transform-arrow-functions';
import { createArrowFunctionsPlugin, applyArrowFunctionsTransform } from '../src/index.mjs';

// 1. Verify default export is the plugin factory function and asserts Babel 7 compatibility
const plugin = arrowFunctionsPlugin.default || arrowFunctionsPlugin;
assert.equal(typeof plugin, 'function', 'Default export must be a plugin factory function');

let assertedVersion = null;
const mockApi = {
  assertVersion(version) {
    assertedVersion = version;
  },
  assumption(name) {
    return undefined;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersion, 7, 'Plugin must assert Babel version 7 compatibility');

// 2. Verify plugin structure and visitor
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-arrow-functions', 'Plugin name must be transform-arrow-functions');
assert.equal(typeof instance.visitor, 'object', 'Plugin must provide a visitor object');
assert.equal(typeof instance.visitor.ArrowFunctionExpression, 'function', 'Visitor must provide ArrowFunctionExpression method');

// 3. Verify ArrowFunctionExpression visitor invokes arrowFunctionToExpression with default loose options
{
  let passedOpts = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      passedOpts = opts;
    }
  };
  instance.visitor.ArrowFunctionExpression(mockPath);
  assert.deepEqual(passedOpts, {
    allowInsertArrow: false,
    noNewArrows: true,
    specCompliant: false
  }, 'Default visitor execution must invoke arrowFunctionToExpression with loose configuration');
}

// 4. Verify ArrowFunctionExpression visitor enables specCompliant and disables noNewArrows when spec option is true
{
  const specInstance = plugin(mockApi, { spec: true });
  let passedOpts = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      passedOpts = opts;
    }
  };
  specInstance.visitor.ArrowFunctionExpression(mockPath);
  assert.deepEqual(passedOpts, {
    allowInsertArrow: false,
    noNewArrows: false,
    specCompliant: true
  }, 'spec option must configure specCompliant: true and noNewArrows: false');
}

// 5. Verify ArrowFunctionExpression visitor prioritizes noNewArrows compiler assumption over spec option
{
  const assumptionApi = {
    assertVersion: () => true,
    assumption: (name) => (name === 'noNewArrows' ? true : undefined)
  };
  const assumptionInstance = plugin(assumptionApi, { spec: true });
  let passedOpts = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      passedOpts = opts;
    }
  };
  assumptionInstance.visitor.ArrowFunctionExpression(mockPath);
  assert.deepEqual(passedOpts, {
    allowInsertArrow: false,
    noNewArrows: true,
    specCompliant: false
  }, 'Compiler assumption noNewArrows: true must override spec: true');
}

// 6. Verify ArrowFunctionExpression visitor skips transformation when node is not an arrow function expression
{
  let called = false;
  const mockNonArrowPath = {
    isArrowFunctionExpression: () => false,
    arrowFunctionToExpression: () => {
      called = true;
    }
  };
  instance.visitor.ArrowFunctionExpression(mockNonArrowPath);
  assert.equal(called, false, 'Visitor must not invoke arrowFunctionToExpression if isArrowFunctionExpression returns false');
}

// 7. Verify module helpers instantiate the plugin and execute arrow function transformations
{
  const helperInstance = createArrowFunctionsPlugin();
  assert.equal(helperInstance.name, 'transform-arrow-functions');

  let passedOpts = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      passedOpts = opts;
    }
  };
  applyArrowFunctionsTransform(helperInstance, mockPath);
  assert.deepEqual(passedOpts, {
    allowInsertArrow: false,
    noNewArrows: true,
    specCompliant: false
  }, 'Helper function must execute transformation with expected parameters');
}

console.log('Contract assertions passed.');

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