I would like to +1 this as well.
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+1
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We use Self-hosted Retool with reusable modules and face the same issue of custom CSS/JS not being propagated to parent apps.
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Hi @Fernando_Constantino, welcome to the forum! 
We still have no updates on this request but we've resurfaced it internally. We'll let you know here when there's any progress.
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+1
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+1
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I have a quick update on this, just to keep everybody in the loop.
We are currently scoping out a rework of our approach to UI encapsulation and, as such, will be taking a close look at modules. This includes both existing features requests as well as long-standing bugs. I anticipate being able to share additional updates in the relatively near future. 
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Is there a target stable release for this yet?
It's frustrating not to be able to use these in modules
Nothing yet, @DavidM. We've decided not to prioritize this particular work during the current development cycle and will instead explicitly disable preloaded scripts within modules, given the fact that it's just not working currently. This functionality will have to be added as a separate feature down the road.
I'm happy to answer any additional questions and will continue to provide updates here whenever possible.