CodeSampleX

Exemplo

@babel/plugin-transform-async-to-generator 8.0.1: default

Amostra verificada para npm @babel/plugin-transform-async-to-generator 8.0.1: default. O contrato rodou em node 22 · linux debian/x64 · docker e passou.

sha256:ffe7184cc5246f7fb26cc1375e093f21620a3b2668b73e2b34c8619afd962e05

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
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…		 2026-09-05

Caso

HOW
Objetivo
verify @babel/plugin-transform-async-to-generator.default in pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1
Pacotes
Símbolos
  • @babel/plugin-transform-async-to-generator.default
Criado
2026-09-05T21:49:43Z

Contrato

  1. Plugin default export is a function factory asserting Babel compatibility for versions 7 and 8
  2. Plugin factory returns an object named transform-async-to-generator with a Function visitor
  3. Plugin transforms async function declarations into generator functions wrapped with _asyncToGenerator
  4. Plugin transforms async arrow functions into generator functions wrapped with _asyncToGenerator
  5. Plugin supports custom method and module options to import custom async wrapper functions
  6. Plugin preserves synchronous functions and generator functions without transformation
  7. Helper functions provide wrappers for plugin instantiation and code transformation

Arquivos

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

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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-async-to-generator.default in pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1
Demonstrate these symbols/APIs:
  - @babel/plugin-transform-async-to-generator.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:f54a051e3ba84dc84c8a84b72a1635969143bfa43832a3fba7291ec473035876","contract":["Plugin default export is a function factory asserting Babel compatibility for versions 7 and 8","Plugin factory returns an object named transform-async-to-generator with a Function visitor","Plugin transforms async function declarations into generator functions wrapped with _asyncToGenerator","Plugin transforms async arrow functions into generator functions wrapped with _asyncToGenerator","Plugin supports custom method and module options to import custom async wrapper functions","Plugin preserves synchronous functions and generator functions without transformation","Helper functions provide wrappers for plugin instantiation and code transformation"],"goal":"verify @babel/plugin-transform-async-to-generator.default in pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1","kind":"HOW","packages":["pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1"],"schemaVersion":1,"symbols":["@babel/plugin-transform-async-to-generator.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-async-to-generator@8.0.1"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1","symbols":["@babel/plugin-transform-async-to-generator.default"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-plugin-transform-async-to-generator",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-transform-async-to-generator": "8.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/plugin-transform-async-to-generator.default in pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-async-to-generator@8.0.1"
  ],
  "symbols": [
    "@babel/plugin-transform-async-to-generator.default"
  ]
}
src/index.mjs
import babelPluginTransformAsyncToGenerator from '@babel/plugin-transform-async-to-generator';
import { transformSync } from '@babel/core';

/**
 * Creates an instance of the async-to-generator transform plugin.
 * @param {object} [api] - Babel plugin API (assertVersion, assumption, etc.)
 * @param {object} [options] - Plugin configuration options (e.g. method, module)
 * @returns {object} Plugin object with name and visitor
 */
export function createAsyncToGeneratorPlugin(api, options = {}) {
  const plugin = babelPluginTransformAsyncToGenerator.default || babelPluginTransformAsyncToGenerator;
  const babelApi = api || {
    assertVersion: () => true,
    assumption: () => false
  };
  return plugin(babelApi, options);
}

/**
 * Transforms code containing async functions into ES2015 generator-based code.
 * @param {string} code - Source code string to transform
 * @param {object} [pluginOptions] - Optional options for the async-to-generator plugin
 * @returns {string} Transformed JavaScript code
 */
export function transformAsyncCode(code, pluginOptions = {}) {
  const plugin = babelPluginTransformAsyncToGenerator.default || babelPluginTransformAsyncToGenerator;
  const result = transformSync(code, {
    configFile: false,
    babelrc: false,
    plugins: [[plugin, pluginOptions]]
  });
  return result?.code ?? '';
}
test/contract.mjs
import assert from 'node:assert/strict';
import asyncToGeneratorPlugin from '@babel/plugin-transform-async-to-generator';
import {
  createAsyncToGeneratorPlugin,
  transformAsyncCode
} from '../src/index.mjs';

// 1. Verify default export is a function factory asserting Babel compatibility
const plugin = asyncToGeneratorPlugin.default || asyncToGeneratorPlugin;
assert.equal(typeof plugin, 'function', 'Plugin export must be a function factory');

let assertedVersion = null;
const queriedAssumptions = [];
const mockApi = {
  assertVersion(range) {
    assertedVersion = range;
  },
  assumption(name) {
    queriedAssumptions.push(name);
    return false;
  }
};

const defaultInstance = plugin(mockApi, {});
assert.equal(assertedVersion, '^7.0.0-0 || ^8.0.0', 'Plugin must assert Babel version range ^7.0.0-0 || ^8.0.0');
assert.ok(queriedAssumptions.includes('noNewArrows'), 'Plugin should query noNewArrows assumption');
assert.ok(queriedAssumptions.includes('ignoreFunctionLength'), 'Plugin should query ignoreFunctionLength assumption');

// 2. Verify returned plugin instance structure and visitor
assert.equal(typeof defaultInstance, 'object', 'Plugin instance must be an object');
assert.equal(defaultInstance.name, 'transform-async-to-generator', 'Plugin name must be transform-async-to-generator');
assert.equal(typeof defaultInstance.visitor, 'object', 'Plugin must expose a visitor object');
assert.equal(typeof defaultInstance.visitor.Function, 'function', 'Plugin visitor must handle Function nodes');

// 3. Verify transformation of async function declaration into generator wrapped with _asyncToGenerator
{
  const source = 'async function fetchResult() { const res = await get(); return res; }';
  const transformed = transformAsyncCode(source);

  assert.ok(transformed.includes('_asyncToGenerator'), 'Output must contain _asyncToGenerator helper');
  assert.ok(transformed.includes('function*'), 'Output must convert async function into a generator');
  assert.ok(transformed.includes('yield get()'), 'Output must yield on await expressions');
  assert.ok(!transformed.includes('async function'), 'Output must not retain async function keyword');
}

// 4. Verify transformation of async arrow functions
{
  const source = 'const compute = async (x) => await calculate(x);';
  const transformed = transformAsyncCode(source);

  assert.ok(transformed.includes('_asyncToGenerator'), 'Output must wrap async arrow in _asyncToGenerator');
  assert.ok(transformed.includes('function*'), 'Output must contain generator function');
  assert.ok(transformed.includes('yield calculate(x)'), 'Output must yield on await inside arrow body');
  assert.ok(!transformed.includes('async (x)'), 'Output must not retain async arrow signature');
}

// 5. Verify custom method and module options for custom wrapper
{
  const source = 'async function customAction() { await perform(); }';
  const transformed = transformAsyncCode(source, {
    method: 'wrapAsyncFunction',
    module: 'my-custom-async-library'
  });

  assert.ok(
    transformed.includes('from "my-custom-async-library"'),
    'Output must import custom wrapper from specified module'
  );
  assert.ok(
    transformed.includes('wrapAsyncFunction'),
    'Output must reference custom wrapper method name'
  );
  assert.ok(
    !transformed.includes('function _asyncToGenerator'),
    'Output must not include default helper when custom wrapper is specified'
  );
}

// 6. Verify preservation of synchronous functions and generators without transformation
{
  const source = [
    'function regularFunction(a, b) { return a + b; }',
    'function* generatorFunction() { yield 1; yield 2; }'
  ].join('\n');
  const transformed = transformAsyncCode(source);

  assert.ok(!transformed.includes('_asyncToGenerator'), 'Sync and generator code must not add _asyncToGenerator');
  assert.ok(transformed.includes('function regularFunction'), 'Synchronous function declaration must be preserved');
  assert.ok(transformed.includes('function* generatorFunction'), 'Generator declaration must be preserved');
}

// 7. Verify helper functions from src/index.mjs
{
  const helperInstance = createAsyncToGeneratorPlugin();
  assert.equal(helperInstance.name, 'transform-async-to-generator', 'Helper must produce valid plugin instance');
  assert.equal(typeof helperInstance.visitor.Function, 'function', 'Helper instance must have Function visitor');

  const helperTransformed = transformAsyncCode('async function test() { await ready(); }');
  assert.ok(helperTransformed.includes('_asyncToGenerator'), 'Helper transformation must succeed');
}

console.log('All contract assertions passed.');

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