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.