Obtain Shiny's Bootstrap Sass theme — getCurrentTheme
  v1.11.1|Source: 
  
  
    
  
R/bootstrap.R
  Description
Intended for use by Shiny developers to create Shiny bindings with intelligent
styling based on the bootstrapLib()'s theme value.
Value
If called at render-time (i.e., inside a htmltools::tagFunction()),
and bootstrapLib()'s theme has been set to a bslib::bs_theme()
object, then this returns the theme. Otherwise, this returns NULL.