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In our project, I was need to sync a piece of information between localStorage and the Redux state. Actually I subscribed to changes in a localStorage and in Redux, and if change happens in localStorage I update the state, and vice versa.

Right now I've created a redux enhancer for that. My coworker, however, claims that it isn't enhancing store functionality, and recommends to use a component, a content-provider or a fragment for that.

As doing it inside Redux' reducers is not recommended, as the reducers should be pure functions, where am I expected to put this sort of side effects?

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    1. Where exactly your colleague suggests to put this code instead of the enhancer? 2. Do you synchronize everything in the store, or just specific pieces of information from the store?
    – Arseni Mourzenko
    Dec 31, 2019 at 16:55
  • In a Component, Content-Provider or Fragments . It should sync only JWT token. I must admit, that I relatively new in a react, only one month. In Vue, I would has done this functionality in an Action. But according to Dan Abramov, Redux' Reducer must be pure functions, so it should be done in other place. stackoverflow.com/questions/35305661/…
    – Anatoly
    Dec 31, 2019 at 17:38
  • Indeed, reducers shouldn't have side effects. There are a bunch of articles such as this one explaining where to put code which has side effects. I'm sorry, I don't have enough skills in React-Redux to be able to tell if those articles are correct or not, neither to write an answer to your question. I'm also surprised I can't find any answer on the subject here, on SE.SE. I therefore reworded your question a bit to make it more specific and reduce the risk of being closed/downvoted.
    – Arseni Mourzenko
    Dec 31, 2019 at 17:49

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