CodeSampleX

示例

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

已验证示例 — npm @babel/plugin-transform-arrow-functions 8.0.1: transform. contract 在 node 22 · linux alpine/x64 · docker 上运行并通过： Plugin default export is a…

sha256:d2f275d4ffc040b9917cdfb2425adfe3a043339795cf227c88b9f198861aab67

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
1
构建过它的签名密钥
1
声明的环境 linux 24 · ubuntu · glibc 2.39 x64 npm

验证运行环境

环境 契约 阶段 运行日期
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

案例

HOW
目标
verify transform in pkg:npm/%40babel/plugin-transform-arrow-functions@8.0.1
包
符号
  • transform
创建时间
2026-08-26T05:11:04Z

契约

  1. Plugin default export is a function factory asserting Babel version range ^7.0.0-0 || ^8.0.0
  2. Plugin factory returns plugin descriptor named transform-arrow-functions with an ArrowFunctionExpression visitor method
  3. ArrowFunctionExpression visitor transforms arrow functions with allowInsertArrow false and default noNewArrows true
  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 AST node is not an arrow function expression
  7. Module helper applyArrowTransform executes plugin visitor and returns resulting transformation configuration

文件

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

下载源代码构件 (tar.gz)

源代码

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 transform 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:
  - transform

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:sha256:5dd43545f808b0c29c7d1f35f53c93f3fb965570f0ea7c1987e1f9f2c247530e","contract":["Plugin default export is a function factory asserting Babel version range ^7.0.0-0 || ^8.0.0","Plugin factory returns plugin descriptor named transform-arrow-functions with an ArrowFunctionExpression visitor method","ArrowFunctionExpression visitor transforms arrow functions with allowInsertArrow false and default noNewArrows true","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 AST node is not an arrow function expression","Module helper applyArrowTransform executes plugin visitor and returns resulting transformation configuration"],"goal":"verify transform 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":["transform"]},"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":["transform"],"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 transform 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": [
    "transform"
  ]
}
src/index.mjs
import arrowFunctionsPluginModule from "@babel/plugin-transform-arrow-functions";

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

/**
 * Creates an instance of the transform-arrow-functions plugin with given API and options.
 */
export function createArrowPluginInstance(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);
}

/**
 * Invokes the ArrowFunctionExpression visitor method on a given AST path.
 */
export function transformArrowFunction(pluginInstance, path) {
  if (!pluginInstance?.visitor?.ArrowFunctionExpression) {
    throw new Error("Invalid plugin instance: missing ArrowFunctionExpression visitor");
  }
  return pluginInstance.visitor.ArrowFunctionExpression(path);
}

/**
 * Simulates arrow function transformation on an AST path object.
 */
export function applyArrowTransform(options = {}, assumptions = {}, customPath = null) {
  let transformedConfig = null;
  const path = customPath || {
    _isArrow: true,
    isArrowFunctionExpression() {
      return this._isArrow;
    },
    arrowFunctionToExpression(opts) {
      transformedConfig = opts;
    }
  };

  const api = {
    assertVersion: () => {},
    assumption: (name) => assumptions[name]
  };

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

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

// Contract 1: Plugin default export is a function factory asserting Babel version range ^7.0.0-0 || ^8.0.0
{
  assert.equal(typeof arrowFunctionsPlugin, "function");
  assert.equal(typeof rawPlugin, "function");

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

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

// Contract 3: ArrowFunctionExpression visitor transforms arrow functions with allowInsertArrow false and default noNewArrows true
{
  const api = {
    assertVersion: () => {},
    assumption: () => undefined
  };
  const pluginInstance = createArrowPluginInstance(api, {});
  let receivedOptions = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      receivedOptions = opts;
    }
  };

  transformArrowFunction(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 = createArrowPluginInstance(api, { spec: true });
  let receivedOptions = null;
  const mockPath = {
    isArrowFunctionExpression: () => true,
    arrowFunctionToExpression: (opts) => {
      receivedOptions = opts;
    }
  };

  transformArrowFunction(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 = createArrowPluginInstance(apiWithAssumptionTrue, { spec: true });
    let receivedOptions = null;
    const mockPath = {
      isArrowFunctionExpression: () => true,
      arrowFunctionToExpression: (opts) => {
        receivedOptions = opts;
      }
    };
    transformArrowFunction(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 = createArrowPluginInstance(apiWithAssumptionFalse, { spec: false });
    let receivedOptions = null;
    const mockPath = {
      isArrowFunctionExpression: () => true,
      arrowFunctionToExpression: (opts) => {
        receivedOptions = opts;
      }
    };
    transformArrowFunction(pluginInstance, mockPath);
    assert.deepEqual(receivedOptions, {
      allowInsertArrow: false,
      noNewArrows: false
    });
  }
}

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

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

// Contract 7: Module helper applyArrowTransform executes plugin visitor and returns resulting transformation configuration
{
  const { transformedConfig: defaultResult } = applyArrowTransform();
  assert.deepEqual(defaultResult, {
    allowInsertArrow: false,
    noNewArrows: true
  });

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

  const { transformedConfig: assumptionResult } = applyArrowTransform(
    { 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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