Add duplicate middleware dev check to configureStore #4927
Merged
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This PR:
configureStore
that throws an error if duplicate middleware references are foundduplicateMiddlewareCheck
option toconfigureStore
to control that behaviorPer issues like #4349 , apparently some folks have managed to accidentally add the same middleware to the store twice (and specifically, the same RTKQ middleware, like
gDM().concat(baseApi.middleware, injectedApi.middleware)
... which is wrong because those are the exact same object and middleware references).Adding a trivial
Set
+ reference checks seems to catch that.I don't think this is common enough to be a major problem, but it was easy enough to throw this check in and add tests + docs, so why not.