aws-amplify-react-native null is not an object (evaluating ‘RNAWSCognito.compouteM

使用aws-amplify-react-native
原来是托管expo项目，eject后登录时报了这个问题
解决 安装​​​amazon-cognito-identity-js​​

react-native link amazon-cognito-identity-js
cd ios
pod install

ok