React Native Local Storage Wrapper

LocalStorage.js

import React from 'react-native';
var {
  AsyncStorage
} = React;

var LocalStorage = {
  get: function (key) {
    return AsyncStorage.getItem(key).then(function(value) {
      return JSON.parse(value);
    });
  },

  save: function (key, value) {
    return AsyncStorage.setItem(key, JSON.stringify(value));
  },

  update: function (key, value) {
    return LocalStorage.get(key).then((item) => {
      // if current value is a string, then overwrite; else merge objects
      let v = (typeof value === 'string') ? value : Object.assign({}, item, value);
      return AsyncStorage.setItem(key, JSON.stringify(v));
    });
  },

  delete: function (key) {
    return AsyncStorage.removeItem(key);
  }
};

export default LocalStorage;