How to fix regeneratorRuntime is not defined?

I have ran into a problem, the error is regeneratorRuntime is not defined while working with React and Parcel bundler.

The problem appeared after I added an async function and while searching the problem, I found a stack-overflow solution but it didn't work. So, don't use this method.

Solution

First, I found this solution:

• add import "babel-polyfill"; at the top of the file that you are using the async function.

BUT

• later learned that babel-polyfill is deprecated. So, to solve the regeneratorRuntime problem, do this:

• Install regenerator-runtime
  npm install --save regenerator-runtime

• Update webpack file
  entry: ["regenerator-runtime/runtime.js", "<your enter js file>"]

• require import 'regenerator-runtime/runtime' at the top of the file that you're using async function

I didn't edit webpack, because I'm using Parcel, but just importing regenerator-runtime/runtime at the top of the file solved the problem.

Resources

BABEL/ReferenceError regeneratorRuntime is not defined #9849

Comments

[Felipe Nascimento de Moura]

wow! It, weirdly enough...worked!
Usually I too waste HOURS looking for how to fix this rocket science configs.
I have components that are lazy loaded with all their dependencies, but when a component imported something from node_modules, I had this error.
I'm using next.js.
I just installed the dependency regenerator-runtime and added import 'regenerator-runtime/runtime'; to the top of the root component that was lazy loaded and it, for my surprise, worked, as simple as that!
Thank you very much :)
Simple and effective.

[Ori A.]

Made an account just to say non of these or any single findable "fix" on the internet can fix this in late 2021,
again webpack and babel waste hours upon hours of dev time for their chronic incompatibly and version inconsistency.
I hate every hour I work in this industry.

[Arkadeep Nag]

then please leave to code

[Nikita Makhov]

Strange, worked for me.

[Yalon]

Thank you 🧡

[Subhajit Roy]

Thank you it solved my async/await issue 🙌🏼

[pyscho3]

Thanks for saving my keyboard from getting shattered, guy.
stick merge

[bleedeleventh]

Thank you so much Hulya, it worked for me.

[execptionerror]

[Already Solved] Babel ReferenceError: regeneratorRuntime is not defined

[Luís Eduardo]

Thanks, work for me 😍

[Moussack]

ty my man this works, i use the simple solution 3

[aderchox]

This is no more recommended. Use this instead:

npm i -D @babel/plugin-transform-runtime

...and add in .babelrc:

  "plugins": [
    ["@babel/transform-runtime", {
      "regenerator": true
    }]
  ]

[itzsrikanth]

I had babel-polyfill in couple of files in codebase but was not able to understand since I was new. In those files it had just this statement to fix issue:

require('babel-polyfill')

or

import 'babel-polyfill'

Thanks for this article..!

[VitoMedlej]

thanks man u saved my keyboard from being smashed

[Hulya]

Haha, good for the keyboard 😃