In addition to enforcing the rules of Hooks, we are also checking whether all the variables that are used in an Effect Hook are passed to its dependency array. This exhaustive dependencies rule ensures that whenever something that is used inside the Effect Hook changes (a function, value, and so on), the Hook will trigger again.

As we have seen in the previous section, there are a couple warnings related to the exhaustive dependencies rule when running the linter with npm run lint. Often, it has to do with the dispatch function or other functions not being part of the dependency array. Usually, these functions should not change, but we can never be sure, so it is better to just add them to the dependencies.