React native persist and encrypt user token - Redux-persist-transform-encrypt error

It seems there is an issue using the encrypt option of redux-persist in react-native:

https://github.com/maxdeviant/redux-persist-transform-encrypt/issues/15

Can anyone help with any solution/workaround to use redux persist to encrypt and store a login token in react-native?

When I try to use the redux persist with the redux-persist-transform-encrypt i get Redux-persist-transform-encrypt: expected outbound state to be a string error

import { createStore, compose, applyMiddleware } from 'redux';
import ReduxThunk from 'redux-thunk';
import { persistStore, autoRehydrate } from 'redux-persist';
import { AsyncStorage } from 'react-native';
import createEncryptor from 'redux-persist-transform-encrypt';
import reducers from './reducers';


const store = createStore(
  reducers,
  {},
  compose(
    applyMiddleware(ReduxThunk),
    autoRehydrate(),
  ),
);

const encryptor = createEncryptor({
  secretKey: 'my-super-secret-key-999',
});


persistStore(
  store,
  {
    storage: AsyncStorage,
    whitelist: ['auth'],
    transforms: [encryptor],
  },
);
export default store;

My auth state is something like this:

const INITIAL_STATE = {
  user: null,
  token: ''
};

Is there any solution to use redux-persist-transform encrypt or the transform and other package to encrypt the token when using redux persist?

I found a solution using the customTransform instead of redux-persist-transform-encrypt:

import { createStore, compose, applyMiddleware } from 'redux';
import ReduxThunk from 'redux-thunk';
import { persistStore, createTransform, autoRehydrate } from 'redux-persist';
import { AsyncStorage } from 'react-native';
import CryptoJS from 'crypto-js';
import reducers from './reducers';


const store = createStore(
  reducers,
  {},
  compose(
    applyMiddleware(ReduxThunk),
    autoRehydrate(),
  ),
);

const encrypt = createTransform(
  (inboundState, key) => {
    if (!inboundState) return inboundState;
    const cryptedText = CryptoJS.AES.encrypt(JSON.stringify(inboundState), 'secret key 123');

    return cryptedText.toString(); 
  },
  (outboundState, key) => {
    if (!outboundState) return outboundState;
    const bytes = CryptoJS.AES.decrypt(outboundState, 'secret key 123');
    const decrypted = bytes.toString(CryptoJS.enc.Utf8);

    return JSON.parse(decrypted);
  },
);

persistStore(
  store,
  {
    storage: AsyncStorage,
    whitelist: ['auth'], // <-- keys from state that should be persisted
    transforms: [encrypt],
  },
);
export default store;

When using redux-persist initial state is triggered before rehydrating is finished so I had to apply this too:

https://github.com/rt2zz/redux-persist/blob/master/docs/recipes.md#delay-render-until-rehydration-complete