You have to update your docs, you have here: SecureStorage usage that one has to do “import { SecureStorage } from 'ionic-native';” but the class name is not SecureStorage, it is ‘NativeStorage’, so it would be “import { NativeStorage } from 'ionic-native';”, and in order to use this api, ionic-native version has to be 1.3.5 or greater as @ihadeed indicates here: NativeStorage not found
UPDATE: SecureStorage and NativeStorage are different plugins, my bad there , but still, updating ‘ionic-native’ as @ihadeed indicates in the link i added, solved it!