resolve_link_as

# File actionview/lib/action_view/helpers/asset_tag_helper.rb, line 505
        def resolve_link_as(extname, mime_type)
          if extname == "js"
            "script"
          elsif extname == "css"
            "style"
          elsif extname == "vtt"
            "track"
          elsif (type = mime_type.to_s.split("/")[0]) && type.in?(%(audio video font image))
            type
          end
        end