first draft but not working yet

store/index.js

@@ -0,0 +1,18 @@
+import { createStore } from 'zustand/vanilla'
+import { persist } from 'zustand/middleware'
+import { idbStorage } from './middleware/persistence.js'
+
+export const store = createStore(
+  persist(
+    (set, get) => ({
+      user: null,
+      items: [],
+      setUser: (user) => set({ user }),
+      addItem: (item) => set(s => ({ items: [...s.items, item] })),
+    }),
+    {
+      name: 'app-store',
+      storage: idbStorage,   // custom adapter (see below)
+    }
+  )
+)

store/middleware/persistance.js

@@ -0,0 +1,8 @@
+import { get, set, del } from 'idb-keyval'
+import { createJSONStorage } from 'zustand/middleware'
+
+export const idbStorage = createJSONStorage(() => ({
+  getItem: (name) => get(name),
+  setItem: (name, value) => set(name, value),
+  removeItem: (name) => del(name),
+}))