Workaround for promise issues with AsyncStorage multiSet/multiGet/multiRemove in React Native (unresolved as of 2018-07-02). See: https://github.com/facebook/react-native/issues/14101

AsyncStorageSupplement.js

export default class AsyncStorageSupplement {
  static multiGet(keys) {
    return Promise.all(
      keys.map(key => AsyncStorage.getItem(key))
    )
  }

  static multiRemove(keys) {
    return Promise.all(
      keys.map(key => AsyncStorage.removeItem(key))
    )
  }

  static multiSet(pairs) {
    return Promise.all(
      pairs.map(pair => AsyncStorage.setItem(pair[0], pair[1]))
    )
  }
}