Our GitHub page shows shiny.react as a 98.5% JavaScript project (bottom of the right panel on the main page), which is not quite right. Due to this rdrr.io doesn't find shiny.react when searching for GitHub packages (hopefully we can be found by searching on CRAN).
We have this problem as our repository contains a lot of non-minified library code, e.g. inst/www/shiny.react/shiny-react.js. It could be addressed by using .gitattributes to mark certain files as generated: Customizing how changed files appear on GitHub.