I've wrote a Single Page Application (SPA) simply using jQuery based on Asp.net Core. No other framework or library is needed (no Angular, no React, no Vue.js...)
So I turned SPA into PWA with WebEssentials.AspNetCore.PWA
SPA implementetion was inspired by this article: https://www.codeproject.com/Articles/848092/Transforming-existing-MVC-application-to-work-as-S