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

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.

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{
  "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"
  }
}

{
  "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"
  ]
}

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 ?? '';
}

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.');