I am developing a mobile app with React native and trying to use firebase as a database. Yesterday I tried to upgrade my React native version from 0.37 to 0.40 but some files conflicted and my app didnt start. So I reverted to version 0.37. ( I copy pasted conflicted files with my earliest copies to solve this)

Now, when I copy paste firebase code snippet to my App.js file to setup firebase, I get an error "Cannot read property 'getItem' of undefined"

If I remove firebase snippet everything works fine. Otherwise after 1-2 seconds red screen pops up with the error on attachments.

I am suspecting, I broke something on the way to reverting react native 0.37. I tried to uninstall and reinstall firebase with no avail. Now I am beating my head and any help would be greatly appreaciated.