babel-preset-async-to-bluebird

1.1.0 verified Sat Apr 25 auth: no javascript maintenance

A Babel preset that transforms async functions into Bluebird coroutines using .coroutine(). It is a specialized preset for projects already using Bluebird, providing an alternative to the default regenerator-based async-to-generator transform. This package is in maintenance mode with no recent updates; the current version is 1.1.0 and it works with Babel 6.

Common errors

error Error: Cannot find module 'babel-preset-async-to-bluebird' ↓

cause Package not installed or not in node_modules.

fix

npm install --save-dev babel-preset-async-to-bluebird

error ReferenceError: regeneratorRuntime is not defined ↓

cause Using async-to-bluebird without having installed or configured Bluebird.

fix

npm install bluebird and ensure it is available at runtime (e.g., require('bluebird')).

error TypeError: (0 , _asyncToBluebird) is not a function ↓

cause Misconfigured Babel preset; likely using an outdated Babel version or incorrect preset reference.

fix

Check Babel version (should be 6) and ensure presets are listed correctly in .babelrc.

Warnings

deprecated Babel 6 is end-of-life. This preset does not support Babel 7+ (unless using @babel/plugin-transform-async-to-generator with regenerator). ↓

fix Upgrade to Babel 7 and use @babel/plugin-transform-async-to-generator or keep Babel 6 if legacy.

breaking Bluebird must be installed separately as a peer dependency (v3+). If Bluebird is missing, async functions will not be transformed correctly. ↓

fix npm install bluebird

gotcha This preset replaces native async/await with Bluebird coroutines. If you later remove Bluebird, async functions will break. ↓

fix Only use this preset if you are committed to Bluebird as a dependency.

gotcha The preset does not include any environment-specific transformations (e.g., polyfills for fetch). You need additional presets like babel-preset-env. ↓

fix Add babel-preset-env to your presets array before async-to-bluebird.

Install

npm install babel-preset-async-to-bluebird

yarn add babel-preset-async-to-bluebird

pnpm add babel-preset-async-to-bluebird

Imports

async-to-bluebird preset
wrong
```
In .babelrc: "presets": ["babel-preset-async-to-bluebird"]
```
correct
```
In .babelrc: "presets": ["async-to-bluebird"]
```
Babel resolves the full package name automatically; using the full name works but is verbose.

require in Node API

wrong

require('babel-preset-async-to-bluebird').transform(...)

correct

require('babel-core').transform('code', { presets: ['async-to-bluebird'] })

The preset is passed as a string, not imported directly.

require in Node API (explicit)
```
const preset = require('babel-preset-async-to-bluebird'); require('babel-core').transform('code', { presets: [preset] })
```
If you prefer to require the preset directly, ensure it is passed as an item in the presets array.

Quickstart

Setup Babel with the async-to-bluebird preset and compile an async function using await.

// .babelrc
{
  "presets": ["async-to-bluebird"]
}

// install
// npm install --save-dev babel-preset-async-to-bluebird babel-preset-env

// src.js
async function fetchData() {
  const res = await fetch('https://api.example.com/data');
  return res.json();
}

// Run: npx babel src.js --out-file compiled.js