babel JS file can't resolve “@babel/runtime/helpers/builtin/classCallCheck”

Question

on-rest my project was working great untill I delete my node_modules file and try to re-install npm package.

I am getting this error

./node_modules/         


        

Answer 1

Since Babel 7.x is still a beta version, there was a breaking change in beta.56, which was released yesterday.

"@babel/runtime": "^7.0.0-beta.56",

If you're using a beta version of something, it is dangerous to use ^ in your version number, because that means it will accept any recent version, whether or not it is actually compatible with previous beta versions.

Since react-scripts uses https://github.com/facebook/create-react-app/blob/1407287839f94151cec729bd89441d4eee7d9dd3/packages/babel-preset-react-app/package.json#L28

"@babel/plugin-transform-runtime": "7.0.0-beta.46",

Your should likely have

"@babel/runtime": "7.0.0-beta.46",

in your own package.json to match.

Answer 2

In my case the problem was in relative paths and complex project structure, so that I had to specify exact location of my node_modules directory:

module.exports = {  
    resolve: {
      modules: [
        path.resolve(__dirname, "node_modules")
      ],
  ...

Answer 3

If you want to use the 7.0.0-beta.56 version, the easiest solution is to create builtin/ folder manually inside helpers/ folder then, move or copy the contents of helpers folder inside helpers/builtin/ and you will not see this error message anymore.

Answer 4

In case you are running into this because of your dependency on material-ui:

Looks like material-ui updated its package.json to reference '7.0.0-beta.42' instead of '^7.0.0-beta.42'

See Issue: 12409