I'm not familiar with React, but why would that not be the case without this lib? {} !=== {} EDIT: Maybe I understand. You're saying a parent component might

I'm not familiar with React, but why would that not be the case without this lib? {} !=== {} EDIT: Maybe I understand. You're saying a parent component might do something like: foo.bar = 'blah'; and then doing a simple equality check foo === foo is not enough, you have to check that the properties have not changed either. Is that correct?