Implementing a (javascript) plugin in R Leaflet

I am building a Leaflet application in R.

I want to use this plugin https://github.com/Turbo87/leaflet-sidebar However, I have no clue where to start.

Guides on implementing Javascript Leaflet plugins in R have not been able to help. Does anyone have any steps/guidance/code I can follow to implement the plugin in my R Leaflet? Any help would be greatly appreciated.

This is where I'm currently at:

sidebarPlugin <- htmlDependency("leaflet-sidebar", "0.2.0",
                            src = c(href = "https://github.com/Turbo87/leaflet-sidebar.git"),
                            script = "src/L.Control.Sidebar.js")

registerPlugin <- function(map, plugin) {
  map$dependencies <- c(map$dependencies, list(plugin))
  map}

testLeaflet <- leaflet() %>%
  addTiles %>%
  addPolylines(data = dijkjson)%>%
  #register plugin on this map instance
  registerPlugin(sidebarPlugin)%>%
  addControl("Test2", position = "topright")%>%
  # Add your custom JS logic here. The `this` keyword
  # refers to the Leaflet (JS) map object.
  onRender("function(el, x) {
       var sidebar = L.control.sidebar('sidebar', {
       position: 'left'}).addTo(this);
       map.addControl(sidebar).addTo(this);
       sidebar.show().addTo(this);
       }")