@babel/plugin-transform-regenerator

What is @babel/plugin-transform-regenerator?

The @babel/plugin-transform-regenerator package is a Babel plugin that enables the transformation of generator functions and async functions into ES5-compatible JavaScript code using the regenerator runtime. It allows developers to use these modern features in environments that do not natively support them.

What are @babel/plugin-transform-regenerator's main functionalities?

Transformation of generator functions

This plugin transforms generator functions into ES5 code by converting the generator syntax into a state machine that is compatible with older JavaScript engines.

function* gen() { yield 1; yield 2; yield 3; }

Transformation of async functions

It also transforms async functions into generator functions and then applies the generator function transformation to ensure compatibility with environments that do not support async/await syntax.

async function foo() { await someAsyncFunction(); }

Other packages similar to @babel/plugin-transform-regenerator

regenerator-runtime

The regenerator-runtime package provides the runtime needed to support the generator functions in environments that do not natively support them. It is often used in conjunction with @babel/plugin-transform-regenerator, which handles the syntax transformation.

babel-plugin-transform-async-to-generator

This package is similar to @babel/plugin-transform-regenerator in that it transforms async functions into generator functions. However, it focuses solely on async functions and does not handle generator functions.

fast-async

fast-async is a Babel plugin that transforms async/await functions into ES5-compatible code using Promises instead of generators. It provides an alternative approach to handling async functions and can be faster than regenerator-based transformations.

README

@babel/plugin-transform-regenerator

Explode async and generator functions into a state machine.

See our website @babel/plugin-transform-regenerator for more information.

Install

Using npm:

npm install --save-dev @babel/plugin-transform-regenerator

or using yarn:

yarn add @babel/plugin-transform-regenerator --dev

Changelog

v7.27.5 (2025-06-03)

:bug: Bug Fix

• babel-plugin-transform-regenerator
  • #17359 fix: Unexpected infinite loop with regenerator for try (@liuxingbaoyu)
• Other
  • #17349 Map ESLint's sourceType: commonjs to script (@JLHwung)

:nail_care: Polish

• babel-parser
  • #17333 Improve using declaration errors (@JLHwung)