[lib] restore function for asserting store after performing ops

Summary:
Reusing code removed in D4333 to check if operations works properly.

Depends on D7396

Test Plan:
On native warnings will pop up

on web errors in console

Reviewers: tomek, marcin

Reviewed By: tomek

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D7397