You don't need to use this unless you want to play around with the internals of elm-pages to build
a similar framework and hook into the low-level details. Otherwise, just grab the Pages.Internal.Internal value
that is in the generated Pages module (see <Pages.Platform>).
Internal detail to track whether to run the CLI step or the runtime step in the browser.
This type is generated for you in your
gen/Pages.elmmodule (see <Pages.Platform>).