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

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 plugin-transform-async-to-generator 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:
  - plugin-transform-async-to-generator
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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-async-to-generator",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "@babel/core": "8.0.1",
    "@babel/plugin-transform-async-to-generator": "8.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify plugin-transform-async-to-generator 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": [
    "plugin-transform-async-to-generator"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import { transformSync } from "@babel/core";
import pluginTransformAsyncToGenerator from "@babel/plugin-transform-async-to-generator";

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

export { pluginTransformAsyncToGenerator };

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

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

// Test 1: transforms async function declarations into generator functions wrapped with async-to-generator helper
{
  const input = `
    async function fetchData(x) {
      const data = await Promise.resolve(x * 2);
      return data + 1;
    }
    fetchData(5);
  `;
  const output = transformAsyncToGenerator(input);
  assert(!output.includes("async function fetchData"), "Output must not contain raw async function declaration");
  assert(output.includes("_asyncToGenerator"), "Output must contain _asyncToGenerator helper");
  assert(output.includes("function*"), "Output must contain generator function");
  assert(output.includes("yield Promise.resolve"), "Output must transform await to yield");

  const result = await eval(output);
  assert.equal(result, 11, "Transformed async function must execute and resolve to expected value");
}

// Test 2: transforms async arrow functions with await expressions into generator functions that yield promises
{
  const input = `
    const calculate = async (a, b) => {
      const sum = await Promise.resolve(a + b);
      return sum * 3;
    };
    calculate(3, 4);
  `;
  const output = transformAsyncToGenerator(input);
  assert(!output.includes("async (a, b)"), "Output must not contain raw async arrow function");
  assert(output.includes("_asyncToGenerator"), "Output must contain _asyncToGenerator helper");
  assert(output.includes("function*"), "Output must contain generator function");
  assert(output.includes("yield Promise.resolve"), "Output must transform await to yield");

  const result = await eval(output);
  assert.equal(result, 21, "Transformed async arrow function must execute and resolve to expected value");
}

// Test 3: transforms async function expressions and preserves asynchronous return value resolution
{
  const input = `
    const processData = async function(value) {
      const first = await Promise.resolve(value);
      const second = await Promise.resolve(first + 10);
      return second;
    };
    processData(20);
  `;
  const output = transformAsyncToGenerator(input);
  assert(!output.includes("async function("), "Output must not contain raw async function expression");
  assert(output.includes("_asyncToGenerator"), "Output must contain _asyncToGenerator helper");
  assert(output.includes("function*"), "Output must contain generator function");

  const result = await eval(output);
  assert.equal(result, 30, "Transformed async function expression must resolve properly");
}

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