ReferenceError: regeneratorRuntime is not defined

After upgrading from 2.4.1 to 2.4.2, I’m now seeing the following error:

ReferenceError: regeneratorRuntime is not defined

[onukselcuk]

I’ve encountered the same problem. My solution was very similar to @Tassfighter . Here is my solution I’m using Next JS, for Next JS Add these to your package.json "dependencies": { "core-js": "^3.3.5", "regenerator-runtime": "^0.13.3" }, "devDependencies": { "@babel/core": "^7.6.4", }

my .babelrc file { "presets": [["next/babel", { "useBuiltIns":"entry", "corejs":3 }]] } in _document.js import these import "core-js"; import regeneratorRuntime from "regenerator-runtime";

For normal setups other than Next JS, below is the configuration Add these to your package.json "dependencies": { "core-js": "^3.3.5", "regenerator-runtime": "^0.13.3" }, "devDependencies": { "@babel/core": "^7.6.4", "@babel/preset-env": "^7.6.3" }

my .babelrc file { "presets": [["@babel/preset-env", { "useBuiltIns":"usage", "corejs":3 }]] }

If you are using “usage” option you don’t need to import core-js and regenerator-runtime, but Next JS creates a problem if you are using “usage” option. You need to use “entry” option and import the files in Next JS.

[eluchsinger]

@Tassfighter this library should list all their dependencies. And if another library uses a different version of regeneratorRuntime, it will be handled as it is handled with all other libraries. It’s a common issue. The behavior as it is now is a bug.