Hi there, so glad to hear you are interested in the new R package enhancements that facilitate using Calcite design components in your Shiny apps. While it's not possible to publish an R Shiny app directly to ArcGIS Online, you can host the app externally and then create an "Application" item in AGOL that points to the app's URL. This creates an AGOL item that references your externally hosted Shiny app, which can then be shared with your organization or groups (or displayed in a Hub, etc), similar to your other AGOL apps.
