Support nested .babelrc files in babel-jest

[lehni]

🚀 Feature Proposal

Add support for nested .babelrc files in sub-folders

Motivation

When working with monorepos, e.g. through Lerna, it is currently not possible to run Jest from the root level in an easy way if each package / project has different .babelrc files, as is often the case when working with backend and frontend code in one monorepo.

I have therefore written my own version of babel-jest called babel-jest-nested that support this feature. I'd like to suggest to include this in babel-jest by default:

https://github.com/lehni/babel-jest-nested

Example

See the example here:

https://github.com/lehni/babel-jest-nested#example-with-lerna

Pitch

I am not the only one struggling with this problem, but so far there was no easy solution, see here:

lerna/lerna#994 (comment)
https://stackoverflow.com/questions/50511308/jest-projects-configuration-does-not-read-babelrc-and-webpack-config-json-in/51174657#51174657

etc.

[lehni]

It sounds like this is related: #6053 (comment)

So maybe PR #6629 isn't the right fix, but then this also means that the orignal getBabelRC() is using the wrong .babelrc files for caching in such circumstances.

[lehni]

I can confirm that #6053 (comment) indeed solves my issues and removes the need for babel-jest-nested

[github-actions]

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