* Add deprecation warning for App Container
* Apply suggestions from code review
Co-Authored-By: Joe Haddad <joe.haddad@zeit.co>
* Tweak for more dead-code elimination
* Show error when `router` or `Component` are returned in _app.js
getInitialProps
* Update to only show error in dev mode
* Update packages/next-server/server/render.tsx
Co-Authored-By: ijjk <22380829+ijjk@users.noreply.github.com>