Getting rid of the renderUI

3. Convert our properties to a JSON with toJSON().

4. Embed the JSON in a script tag with data-for attribute pointing to the unique id parameter.

box2 <- function(..., id = NULL, title = NULL, footer = NULL,
                 background = NULL, width = 6, height = NULL,
                 collapsible = FALSE, collapsed = FALSE) {
  
  # ....; Extra code removed
  
  configTag <- tags$script(
    type = "application/json",
    `data-for` = id,
    jsonlite::toJSON(
      x = props,
      auto_unbox = TRUE,
      json_verbatim = TRUE
    )
  )
  
}