Expo从47升级到49后出现Invalid Adapter: asyncstorage错误求助

问题原因 #

Expo 49升级后，React Native内置的AsyncStorage已被废弃，官方推荐使用@react-native-async-storage/async-storage包，而旧版pouchdb-adapter-asyncstorage未适配该变化，导致适配器无法识别。

解决方案 #

方案一：适配官方AsyncStorage包 #

1. 安装依赖
   先安装官方AsyncStorage包，同时升级PouchDB相关依赖到兼容版本：

   npx expo install @react-native-async-storage/async-storage
   npm install pouchdb-react-native@latest pouchdb-authentication pouchdb-upsert pouchdb-find
   

2. 修改代码配置
   更新导入和适配器配置，手动指定使用新的AsyncStorage实例：

   import React from 'react';
   import PouchDB from 'pouchdb-react-native';
   import PouchAuth from 'pouchdb-authentication';
   import AsyncStorage from '@react-native-async-storage/async-storage';
   import { storeData } from './storageManager';
   import PouchAsyncStorage from 'pouchdb-adapter-asyncstorage';
   
   PouchDB.plugin(PouchAuth);
   PouchDB.plugin(require('pouchdb-upsert'));
   PouchDB.plugin(require('pouchdb-find'));
   
   PouchDB.plugin(PouchAsyncStorage);
   // 手动绑定新的AsyncStorage实例
   PouchDB.defaults({
     asyncStorage: AsyncStorage
   });
   
   let LocalDatabase = new PouchDB('db_name', {
     adapter: 'asyncstorage',
   });
   

3. 清除缓存并重启

   npx expo r -c
   

方案二：使用第三方适配的PouchDB适配器 #

如果方案一无效，可改用专门适配新版React Native的第三方适配器：

1. 替换适配器依赖

   npm uninstall pouchdb-adapter-asyncstorage
   npm install @craftzdog/pouchdb-adapter-react-native
   

2. 修改代码

   import React from 'react';
   import PouchDB from 'pouchdb-react-native';
   import PouchAuth from 'pouchdb-authentication';
   import { storeData } from './storageManager';
   import ReactNativeAdapter from '@craftzdog/pouchdb-adapter-react-native';
   
   PouchDB.plugin(PouchAuth);
   PouchDB.plugin(require('pouchdb-upsert'));
   PouchDB.plugin(require('pouchdb-find'));
   
   PouchDB.plugin(ReactNativeAdapter);
   
   let LocalDatabase = new PouchDB('db_name', {
     adapter: 'react-native',
   });
   

3. 清除缓存重启

   npx expo r -c
   

内容的提问来源于stack exchange，提问作者adabounou