Next.js Modal Pages Demo

$ yarn
$ yarn start

How Does It Work?

• Page updates in Next.js route transitions are performed by unmounting the
  previous page component and mounting the next one.
• In _app.js, you have the ability to render additional content besides just
  the current page component (in fact you could skip rendering the page
  component entirely if you wanted).
• So, this demo renders a component in _app.js that keeps track of the
  previously rendered page components. When the latest page is rendered and
  given a modal query param, the page is pushed onto a stack instead of
  completely replacing the previous one.