How to link different strategies using passportjs?

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I want to link different login methods for one user. But I can't link them. The problem is that it is not clear at the time of entry whether the user is logged in or not. Now I want to link LocalStrategy and VKontakteStrategy. Checking at the route level is somehow stupid. But I can’t get status data before serializeUser in the strategy (well, or I didn’t find how). In general, you need to how to link different login methods for the 1st user

Answer 1

Since no one suggested. I'll tell you how I did it.
1) Included in the strategy 2) In the callback root, I put a property with the user id in the request object. 3) In the strategy handler, I received the request object and retrieved the id 4) Further, the actual behavior from the presence of id passReqToCallback: true