CodeSampleX

サンプル

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

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

sha256:3f23041417c011e7939a19209e175fd007a9e52841ed6669d342386bf349f57a

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 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 debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-04

ケース

HOW
ゴール
verify @babel/plugin-transform-arrow-functions.default in pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1
パッケージ
シンボル
  • @babel/plugin-transform-arrow-functions.default
作成日
2026-09-04T01:24:46Z

コントラクト

  1. Plugin default export is a function factory asserting Babel 7 and 8 compatibility
  2. Plugin factory returns an object named transform-arrow-functions with an ArrowFunctionExpression visitor method
  3. ArrowFunctionExpression visitor invokes arrowFunctionToExpression with default loose options when spec option is omitted
  4. ArrowFunctionExpression visitor sets noNewArrows to false when spec option is true
  5. ArrowFunctionExpression visitor prioritizes noNewArrows compiler assumption over spec option
  6. ArrowFunctionExpression visitor skips transformation when node is not an arrow function expression
  7. Module helper simulateArrowTransformation successfully executes plugin lifecycle and collects transform configuration

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 @babel/plugin-transform-arrow-functions.default 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:
  - @babel/plugin-transform-arrow-functions.default

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:sha256:6802d742bb70115c0c4aa6a7e4d53d96717c8075c5a48524126274058dd740d6","contract":["Plugin default export is a function factory asserting Babel 7 and 8 compatibility","Plugin factory returns an object named transform-arrow-functions with an ArrowFunctionExpression visitor method","ArrowFunctionExpression visitor invokes arrowFunctionToExpression with default loose options when spec option is omitted","ArrowFunctionExpression visitor sets noNewArrows to false 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 helper simulateArrowTransformation successfully executes plugin lifecycle and collects transform configuration"],"goal":"verify @babel/plugin-transform-arrow-functions.default 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":["@babel/plugin-transform-arrow-functions.default"]},"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":["@babel/plugin-transform-arrow-functions.default"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-plugin-transform-arrow-functions",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-transform-arrow-functions": "8.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/plugin-transform-arrow-functions.default 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": [
    "@babel/plugin-transform-arrow-functions.default"
  ]
}
src/index.mjs
import arrowFunctionsPluginModule from "@babel/plugin-transform-arrow-functions";

export const arrowFunctionsPlugin =
  typeof arrowFunctionsPluginModule === "function"
    ? arrowFunctionsPluginModule
    : arrowFunctionsPluginModule.default || arrowFunctionsPluginModule;

export 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 arrowFunctionsPlugin(normalizedApi, options);
}

export function transformArrowNode(pluginInstance, path) {
  if (!pluginInstance?.visitor?.ArrowFunctionExpression) {
    throw new Error("Invalid plugin instance: missing ArrowFunctionExpression visitor");
  }
  return pluginInstance.visitor.ArrowFunctionExpression(path);
}

export function simulateArrowTransformation(options = {}, assumptions = {}, mockPath = null) {
  let transformedConfig = null;
  const path = mockPath || {
    _isArrow: true,
    isArrowFunctionExpression() {
      return this._isArrow;
    },
    arrowFunctionToExpression(opts) {
      transformedConfig = opts;
    }
  };

  const api = {
    assertVersion: (range) => {
      if (typeof range === "string" && !range.includes("8")) {
        throw new Error(`Expected range supporting Babel 8, received: ${range}`);
      }
    },
    assumption: (name) => assumptions[name]
  };

  const instance = instantiatePlugin(api, options);
  transformArrowNode(instance, path);
  return { instance, path, transformedConfig };
}
test/contract.mjs
import assert from "node:assert/strict";
import arrowFunctionsPluginModule from "@babel/plugin-transform-arrow-functions";
import {
  arrowFunctionsPlugin,
  instantiatePlugin,
  transformArrowNode,
  simulateArrowTransformation
} from "../src/index.mjs";

const rawPlugin =
  typeof arrowFunctionsPluginModule === "function"
    ? arrowFunctionsPluginModule
    : arrowFunctionsPluginModule.default || arrowFunctionsPluginModule;

// Contract 1: Plugin default export is a function factory asserting Babel 7 and 8 compatibility
{
  assert.equal(typeof arrowFunctionsPlugin, "function");
  assert.equal(typeof rawPlugin, "function");

  let assertedRange = null;
  const api = {
    assertVersion: (r) => {
      assertedRange = r;
    },
    assumption: () => undefined
  };
  const pluginInstance = rawPlugin(api, {});
  assert.equal(assertedRange, "^7.0.0-0 || ^8.0.0");
  assert.ok(pluginInstance);
}

// Contract 2: Plugin factory returns an object named transform-arrow-functions with an ArrowFunctionExpression visitor method
{
  const api = {
    assertVersion: () => {},
    assumption: () => undefined
  };
  const pluginInstance = instantiatePlugin(api, {});
  assert.equal(pluginInstance.name, "transform-arrow-functions");
  assert.ok(pluginInstance.visitor);
  assert.equal(typeof pluginInstance.visitor.ArrowFunctionExpression, "function");
}

// Contract 3: ArrowFunctionExpression visitor invokes arrowFunctionToExpression with default loose options when spec option is omitted
{
  const api = {
    assertVersion: () => {},
    assumption: () => undefined
  };
  const pluginInstance = instantiatePlugin(api, {});
  let receivedOptions = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      receivedOptions = opts;
    }
  };

  transformArrowNode(pluginInstance, mockPath);
  assert.deepEqual(receivedOptions, {
    allowInsertArrow: false,
    noNewArrows: true
  });
}

// Contract 4: ArrowFunctionExpression visitor sets noNewArrows to false when spec option is true
{
  const api = {
    assertVersion: () => {},
    assumption: () => undefined
  };
  const pluginInstance = instantiatePlugin(api, { spec: true });
  let receivedOptions = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      receivedOptions = opts;
    }
  };

  transformArrowNode(pluginInstance, mockPath);
  assert.deepEqual(receivedOptions, {
    allowInsertArrow: false,
    noNewArrows: false
  });
}

// Contract 5: ArrowFunctionExpression visitor prioritizes noNewArrows compiler assumption over spec option
{
  // When assumption noNewArrows is true, it overrides spec: true
  {
    const apiWithAssumptionTrue = {
      assertVersion: () => {},
      assumption: (name) => (name === "noNewArrows" ? true : undefined)
    };
    const pluginInstance = instantiatePlugin(apiWithAssumptionTrue, { spec: true });
    let receivedOptions = null;
    const mockPath = {
      isArrowFunctionExpression: () => true,
      arrowFunctionToExpression: (opts) => {
        receivedOptions = opts;
      }
    };
    transformArrowNode(pluginInstance, mockPath);
    assert.deepEqual(receivedOptions, {
      allowInsertArrow: false,
      noNewArrows: true
    });
  }

  // When assumption noNewArrows is false, it overrides spec: false
  {
    const apiWithAssumptionFalse = {
      assertVersion: () => {},
      assumption: (name) => (name === "noNewArrows" ? false : undefined)
    };
    const pluginInstance = instantiatePlugin(apiWithAssumptionFalse, { spec: false });
    let receivedOptions = null;
    const mockPath = {
      isArrowFunctionExpression: () => true,
      arrowFunctionToExpression: (opts) => {
        receivedOptions = opts;
      }
    };
    transformArrowNode(pluginInstance, mockPath);
    assert.deepEqual(receivedOptions, {
      allowInsertArrow: false,
      noNewArrows: false
    });
  }
}

// Contract 6: ArrowFunctionExpression visitor skips transformation when node is not an arrow function expression
{
  const api = {
    assertVersion: () => {},
    assumption: () => undefined
  };
  const pluginInstance = instantiatePlugin(api, {});
  let called = false;
  const nonArrowPath = {
    isArrowFunctionExpression: () => false,
    arrowFunctionToExpression: () => {
      called = true;
    }
  };

  transformArrowNode(pluginInstance, nonArrowPath);
  assert.equal(called, false);
}

// Contract 7: Module helper simulateArrowTransformation successfully executes plugin lifecycle and collects transform configuration
{
  const { transformedConfig: defaultResult } = simulateArrowTransformation();
  assert.deepEqual(defaultResult, {
    allowInsertArrow: false,
    noNewArrows: true
  });

  const { transformedConfig: specResult } = simulateArrowTransformation({ spec: true });
  assert.deepEqual(specResult, {
    allowInsertArrow: false,
    noNewArrows: false
  });

  const { transformedConfig: assumptionResult } = simulateArrowTransformation(
    { spec: false },
    { noNewArrows: false }
  );
  assert.deepEqual(assumptionResult, {
    allowInsertArrow: false,
    noNewArrows: false
  });
}

console.log("All @babel/plugin-transform-arrow-functions contract tests passed successfully.");

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