サンプル

@babel/plugin-transform-arrow-functions 8.0.1: pluginTransformArrowFunctions

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

sha256:f044dfabf15ed4a9343f92179114e9aaa6dfa538a5b1d75ff4d68f2275296e65

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…	2026-08-26

ケース

HOW

ゴール: verify pluginTransformArrowFunctions in pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1
パッケージ: @babel/plugin-transform-arrow-functions 8.0.1
シンボル: pluginTransformArrowFunctions
作成日: 2026-08-26T05:10:13Z

コントラクト

transforms concise body arrow functions to standard function expressions with explicit return
transforms block body arrow functions with multiple parameters to standard function expressions
transforms parameterless arrow functions to standard function expressions

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 pluginTransformArrowFunctions in pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1
Demonstrate these symbols/APIs:
  - pluginTransformArrowFunctions

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:sha256:15a25801d21f41f6de518ed7b5e4f1d6a47d1e7efc03f2beff313a2a6d4de346","contract":["transforms concise body arrow functions to standard function expressions with explicit return","transforms block body arrow functions with multiple parameters to standard function expressions","transforms parameterless arrow functions to standard function expressions"],"goal":"verify pluginTransformArrowFunctions in pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1","kind":"HOW","packages":["pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1"],"schemaVersion":1,"symbols":["pluginTransformArrowFunctions"]},"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@8.0.1"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1","symbols":["pluginTransformArrowFunctions"],"verifierAdapter":"node-typescript@1"}

package-lock.json

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package.json

{
  "name": "sample-arrow-functions",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "@babel/core": "8.0.1",
    "@babel/plugin-transform-arrow-functions": "8.0.1"
  }
}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify pluginTransformArrowFunctions in pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1"
  ],
  "symbols": [
    "pluginTransformArrowFunctions"
  ]
}

src/index.mjs

import { transformSync } from "@babel/core";
import pluginTransformArrowFunctions from "@babel/plugin-transform-arrow-functions";

/**
 * Transforms arrow functions in JavaScript code into ES5 standard functions.
 * @param {string} code - Source JavaScript code.
 * @param {object} [options] - Plugin configuration options.
 * @returns {string} - Transformed JavaScript code.
 */
export function transformArrowFunctions(code, options = {}) {
  const result = transformSync(code, {
    plugins: [[pluginTransformArrowFunctions, options]],
    configFile: false,
    babelrc: false,
  });
  return result?.code ?? "";
}

export { pluginTransformArrowFunctions };

test/contract.mjs

import assert from "node:assert/strict";
import { transformArrowFunctions, pluginTransformArrowFunctions } from "../src/index.mjs";

assert.equal(typeof pluginTransformArrowFunctions, "function", "pluginTransformArrowFunctions should be a function");

// Test 1: Transform concise body arrow function
{
  const input = "const square = (x) => x * x;";
  const output = transformArrowFunctions(input);
  assert(!output.includes("=>"), "Output must not contain arrow function syntax");
  assert(output.includes("function (x)"), "Output must contain regular function");
  assert(output.includes("return x * x;"), "Output must have explicit return");
}

// Test 2: Transform block body arrow function with multiple parameters
{
  const input = "const sum = (a, b) => { return a + b; };";
  const output = transformArrowFunctions(input);
  assert(!output.includes("=>"), "Output must not contain arrow function syntax");
  assert(output.includes("function (a, b)"), "Output must contain regular function");
  assert(output.includes("return a + b;"), "Output must preserve block return");
}

// Test 3: Transform parameterless arrow function
{
  const input = "const getConstant = () => 42;";
  const output = transformArrowFunctions(input);
  assert(!output.includes("=>"), "Output must not contain arrow function syntax");
  assert(output.includes("function ()"), "Output must contain regular function");
  assert(output.includes("return 42;"), "Output must have explicit return");
}

console.log("All contract tests passed successfully.");

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