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Discussion on: Monorepos: Lerna, TypeScript, CRA and Storybook combined

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ppalmeida profile image
Pedro Paulo Almeida

Hello. Thank you so much for this very good article.

After install / bootstrap the dependencies using lerna bootstrap and run lerna run start --parallel on the root folder, the CRA package complains like this:


There might be a problem with the project dependency tree.
It is likely not a bug in Create React App, but something you need to fix locally.

The react-scripts package provided by Create React App requires a dependency:

  "babel-loader": "8.0.6"

Don't try to install it manually: your package manager does it automatically.
However, a different version of babel-loader was detected higher up in the tree:
etc..
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This is an old and known common error when starting with CRA: we shouldn't add babel-loader AND react-scripts at the same time. But, yeah, I know that babel-loader is there because of my-monorepo-ui-lib package. So, I'm kinda stuck in this error... do you have any suggestion?

Thank you so much for your time.

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shnydercom profile image
shnyder Author

Hi Pedro,
I know it's a bit late, but with the update to react-scripts 4.x and storybook, this error should be gone. It came from a version-mismatch of the babel-loader, because CRA comes with one version, but the older storybook needed another one to function. Storybook has really shortened the list of dependencies it needs to run, and babel-loader is still in the dependency tree, but not explicitly.