Is it legal to do a conditional initialState in the recuder?

Question

React

Is it possible to describe some logic in the initial state of the reducer?

For example, when starting an application, if the cookie contains a certain value, then immediately put something in the initial state of some reducer? Or is it better not to do this and write a separate saga and check everything there, and then change the state of the reducer?

For example, there is a user token in the cookie, so the user was authorized, if not, then no