home/.config/nvim/lua/plugins/bufferline.lua

@@ -2,4 +2,13 @@ return {
   "akinsho/bufferline.nvim",
   version = "*",
   dependencies = { "kyazdani42/nvim-web-devicons" },
+  opts = {
+    options = {
+      diagnostics = "nvim_lsp",
+      diagnostics_indicator = function(count, level)
+        local icon = level:match("error") and " " or " "
+        return " " .. icon .. count
+      end,
+    },
+  },
 }