Storage and Secure Data

import AsyncStorage from "@react-native-async-storage/async-storage";
 
await AsyncStorage.setItem("theme", "dark");
const theme = await AsyncStorage.getItem("theme");

await AsyncStorage.multiSet([
  ["onboarding.done", "1"],
  ["locale", "en"],
]);
const pairs = await AsyncStorage.multiGet(["onboarding.done", "locale"]);

import * as SecureStore from "expo-secure-store";
 
await SecureStore.setItemAsync("accessToken", token);
const token = await SecureStore.getItemAsync("accessToken");

await SecureStore.deleteItemAsync("accessToken");
await SecureStore.deleteItemAsync("refreshToken");

import * as FileSystem from "expo-file-system";
 
const dir = FileSystem.documentDirectory; // string | null
const path = `${dir}notes.txt`;

await FileSystem.writeAsStringAsync(path, contents, {
  encoding: FileSystem.EncodingType.UTF8,
});
const text = await FileSystem.readAsStringAsync(path);

const cachePath = `${FileSystem.cacheDirectory}avatar-tmp.jpg`;

import * as SQLite from "expo-sqlite";
 
const db = await SQLite.openDatabaseAsync("app.db");
await db.execAsync("CREATE TABLE IF NOT EXISTS notes (id TEXT PRIMARY KEY, body TEXT);");

// Conceptual: storage.set("key", value); const v = storage.getString("key");

// persist( (set) => ({ token: null, setToken: (t) => set({ token: t }) }),
//   { name: "auth", storage: createJSONStorage(() => asyncStorage) } )

async function clearUserData() {
  await AsyncStorage.multiRemove(["user.profile", "user.prefs"]);
  await SecureStore.deleteItemAsync("accessToken");
}

function readJson<T>(raw: string | null, fallback: T): T {
  if (!raw) return fallback;
  try {
    return JSON.parse(raw) as T;
  } catch {
    return fallback;
  }
}

const VERSION = "2";
const v = await AsyncStorage.getItem("storage.version");
if (v !== VERSION) {
  await migrate(v);
  await AsyncStorage.setItem("storage.version", VERSION);
}

import * as Crypto from "expo-crypto";
 
const id = Crypto.randomUUID();

try {
  await SecureStore.setItemAsync("accessToken", token);
} catch {
  // Fall back: keep token in memory only for this session
  memorySession.token = token;
}