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What does "do in action" mean? If you mean "make API call in reducer", that is commonly known to be an anti-pattern. Triggering the API call by dispatching action, however, is a common pattern. Usually it's implemented with a library like redux-saga or redux-observable.

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I agree it's better if the implementation of, say, the API is not done in actions.

Although I do not agree actions should be responsible for triggering application logic. It is a very popular pattern indeed, and I've used myself a number of times, but my code makes a lot more sense now that store(s) are only responsible for state management.

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