Deploy React App with React Router to Github Pages for Free | by Arijit Chowdhury | Medium
https://reacttraining.com/react-router/ does not render in google cached pages · Issue #5801 · remix-run/react-router · GitHub
Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. · Issue #5428 · remix-run/react-router · GitHub