Use capacitor preferences package instead of localStorage

src/lib/storage.ts

@@ -0,0 +1,28 @@
+import {type StorageProvider} from "@welshman/store"
+import {Preferences} from "@capacitor/preferences"
+
+export class PreferencesStorageProvider implements StorageProvider {
+  get = async <T>(key: string): Promise<T | undefined> => {
+    const result = await Preferences.get({key})
+    if (!result.value) return undefined
+    try {
+      return JSON.parse(result.value)
+    } catch (e) {
+      return undefined
+    }
+  }
+
+  p = Promise.resolve()
+  set = async <T>(key: string, value: T): Promise<void> => {
+    this.p = this.p.then(async () => await Preferences.set({key, value: JSON.stringify(value)}))
+    await this.p
+  }
+
+  clear = async (): Promise<void> => {
+    await Preferences.clear()
+    this.p = Promise.resolve()
+  }
+}
+
+// singleton instance of PreferencesStorageProvider
+export const preferencesStorageProvider = new PreferencesStorageProvider()