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Summary:
Jest 28 will error if only a string is returned from a transfomer, it needs to be an object of `{code: string, map?: object}`. Returning an object has been supported since https://github.com/facebook/jest/pull/2290, released in Jest v20.
## Changelog
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[Internal] [Fixed] - Return object from Jest preprocessor
Pull Request resolved: https://github.com/facebook/react-native/pull/33576
Test Plan: Green CI?
Reviewed By: motiz88
Differential Revision: D35426748
Pulled By: robhogan
fbshipit-source-id: 3edb79b62b2d34274be192061817d3fcd8a7ba17