'Can you have a single file with multiple routes in NextJS?

I'm new to React/NextJS and I'm trying to figure out if its possible to have a single file with multiple routes.

Example: Login Page
 When you request domain.com/login it routes to the auth.js file and shows the related component dynamically instead of having 4 different files/pages. This way the whole page isn’t showing a flash of white when moving between them, it is just dynamically switching the dynamic components area in and out.

Right now I have 4 different files in /pages and you get full page refreshes where the page flashes white and this seems silly.

enter image description here

reactjsnext.jsdynamic-routing


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