useMemo inside useState in example

[MohammadAzimi]

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There's a useNavigationPanel hook in the hook folder of the example project. I was trying to get deep in how to use the react-native-pager-view and I saw this useMemo as the initializer of useState.
Is it a mistake? What kind of syntax is it and what is the reason?
As far as I know, the useState initializer executes just once before the first render and will not execute again unless the component remounts.
So if it's on purpose, then please explain it. Otherwise, I can create a PR and change it to a normal useState