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Hulya
Hulya

Posted on

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.

Alt Text

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

Top comments (21)

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felipenmoura profile image
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.

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orialon profile image
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.

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arkadeepnag profile image
Arkadeep Nag

then please leave to code

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defite profile image
Nikita Makhov

Strange, worked for me.

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aycanogut profile image
bleedeleventh

Thank you so much Hulya, it worked for me.

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subhajitroycode profile image
Subhajit Roy

Thank you it solved my async/await issue πŸ™ŒπŸΌ

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pyscho3 profile image
pyscho3

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

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yalondpsi profile image
Yalon

Thank you 🧑

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execptionerror profile image
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luiseduardogfranca profile image
LuΓ­s Eduardo

Thanks, work for me 😍

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moussack profile image
Moussack

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

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aderchox profile image
aderchox

This is no more recommended. Use this instead:

npm i -D @babel/plugin-transform-runtime
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...and add in .babelrc:

  "plugins": [
    ["@babel/transform-runtime", {
      "regenerator": true
    }]
  ]
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itzsrikanth profile image
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')
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or

import 'babel-polyfill'
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Thanks for this article..!

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enraiha0307 profile image
Akanksha Gahalot

Thank you soooo much!!! You saved me!

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hulyakarakaya profile image
Hulya

Happy to help πŸ‘

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vitomedlej profile image
VitoMedlej

thanks man u saved my keyboard from being smashed

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hulyakarakaya profile image
Hulya

Haha, good for the keyboard πŸ˜ƒ

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pedrollcopatti profile image
Pedro Lucas Copatti

I created an account just to thank you!
thank you so much!
Saved me.

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hulyakarakaya profile image
Hulya

Wow, thanks Pedro πŸ‘πŸ»

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prosperdoescode profile image
Prosper Nglazi

Hi, now am getting a 'process not defined' error because in my file am using 'process.env.API_URL' to create a base url to the server. How can I solve this? Thanks

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kirsten_the_dev profile image
kirsten_the_dev

This answer helped me => stackoverflow.com/questions/654870...

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