JS is useful just about anywhere where you might want an abundance of libraries and lots of developers who understand the code.
Stuff like React Native points this out. If your team is going to be mostly made up of webdevs, sometimes it makes sense to max this out as much as possible.
I'd personally not go out of my way to use JS if it's not the case of "we already have webdevs, might as well".
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JS is useful just about anywhere where you might want an abundance of libraries and lots of developers who understand the code.
Stuff like React Native points this out. If your team is going to be mostly made up of webdevs, sometimes it makes sense to max this out as much as possible.
I'd personally not go out of my way to use JS if it's not the case of "we already have webdevs, might as well".