How to run a function on every request in SPA mode

[0djek]

I currently have SPA application. I want to check if the stores that hold user's tokens are set (currently, I have 2 of these but there maybe more in the future).

Currently, I do the checking in the root +layout.ts's load function: I check if the stores exist, if the tokens are not expired etc and I allow user to navigate or redirect him to login if something bad happens. Is this a good way to do it? I also subscribe to those stores in the +layout.ts file just before defining the load function and I never unsub from them because I don't know when/if I should do it.

Is this a good way of doing it? Is there a better way to do it?

I was thinking about using Navigation API/navigating store, but I don't know where should I subscribe to them (or add event listener for the API) as there is no single file that is run on the application start.