feat(mapping): deprecate user mappings and add on_attach (#1424)

lua/nvim-tree/utils.lua

@@ -400,4 +400,10 @@ function M.array_remove(array, item)
   end
 end
 
+function M.inject_node(f)
+  return function()
+    f(require("nvim-tree.lib").get_node_at_cursor())
+  end
+end
+
 return M