diff --git a/lua/lazyvim/config/options.lua b/lua/lazyvim/config/options.lua
index 62c8242e..f71f96df 100644
--- a/lua/lazyvim/config/options.lua
+++ b/lua/lazyvim/config/options.lua
@@ -68,7 +68,7 @@ opt.fillchars = {
   diff = "╱",
   eob = " ",
 }
-opt.foldexpr = "v:lua.LazyVim.ui.foldexpr()" -- treesitter folds
+opt.foldexpr = "v:lua.LazyVim.treesitter.foldexpr()" -- treesitter folds
 opt.foldlevel = 99
 opt.foldmethod = "expr"
 opt.foldtext = ""
@@ -78,7 +78,7 @@ opt.grepformat = "%f:%l:%c:%m"
 opt.grepprg = "rg --vimgrep"
 opt.ignorecase = true -- Ignore case
 opt.inccommand = "nosplit" -- preview incremental substitute
-opt.indentexpr = "v:lua.LazyVim.ui.indentexpr()" -- treesitter indents
+opt.indentexpr = "v:lua.LazyVim.treesitter.indentexpr()" -- treesitter indents
 opt.jumpoptions = "view"
 opt.laststatus = 3 -- global statusline
 opt.linebreak = true -- Wrap lines at convenient points
diff --git a/lua/lazyvim/plugins/treesitter.lua b/lua/lazyvim/plugins/treesitter.lua
index 1d5abb2f..5462149a 100644
--- a/lua/lazyvim/plugins/treesitter.lua
+++ b/lua/lazyvim/plugins/treesitter.lua
@@ -19,7 +19,9 @@ return {
     event = { "LazyFile", "VeryLazy" },
     cmd = { "TSUpdate", "TSInstall", "TSLog", "TSUninstall" },
     opts_extend = { "ensure_installed" },
+    ---@class lazyvim.TSConfig: TSConfig
     opts = {
+      -- LazyVim config for treesitter
       ensure_installed = {
         "bash",
         "c",
@@ -47,43 +49,39 @@ return {
         "yaml",
       },
     },
-    ---@param plugin LazyPlugin
-    ---@param opts TSConfig
-    config = function(plugin, opts)
-      if vim.fn.executable("tree-sitter") == 0 then
-        LazyVim.error({
+    ---@param opts lazyvim.TSConfig
+    config = function(_, opts)
+      local TS = require("nvim-treesitter")
+
+      -- some quick sanity checks
+      if not TS.get_installed then
+        return LazyVim.error("Please use `:Lazy` and update `nvim-treesitter`")
+      elseif vim.fn.executable("tree-sitter") == 0 then
+        return LazyVim.error({
           "**treesitter-main** requires the `tree-sitter` CLI executable to be installed.",
           "Run `:checkhealth nvim-treesitter` for more information.",
         })
-        return
-      end
-      if type(opts.ensure_installed) ~= "table" then
-        LazyVim.error("`nvim-treesitter` opts.ensure_installed must be a table")
+      elseif type(opts.ensure_installed) ~= "table" then
+        return LazyVim.error("`nvim-treesitter` opts.ensure_installed must be a table")
       end
 
-      local TS = require("nvim-treesitter")
-      if not TS.get_installed then
-        LazyVim.error("Please use `:Lazy` and update `nvim-treesitter`")
-        return
-      end
+      -- setup treesitter
       TS.setup(opts)
 
-      local needed = LazyVim.dedup(opts.ensure_installed --[[@as string[] ]])
-      LazyVim.ui.installed = TS.get_installed("parsers")
-
+      -- install missing parsers
       local install = vim.tbl_filter(function(lang)
-        return not LazyVim.ui.have(lang)
-      end, needed)
-
+        return not LazyVim.treesitter.have(lang)
+      end, opts.ensure_installed or {})
       if #install > 0 then
         TS.install(install, { summary = true }):await(function()
-          LazyVim.ui.installed = TS.get_installed("parsers")
+          LazyVim.treesitter.get_installed(true) -- refresh the installed langs
         end)
       end
 
+      -- treesitter highlighting
       vim.api.nvim_create_autocmd("FileType", {
         callback = function(ev)
-          if LazyVim.ui.have(ev.match) then
+          if LazyVim.treesitter.have(ev.match) then
             pcall(vim.treesitter.start)
           end
         end,
diff --git a/lua/lazyvim/util/deprecated.lua b/lua/lazyvim/util/deprecated.lua
index 375bc9ca..3aad7318 100644
--- a/lua/lazyvim/util/deprecated.lua
+++ b/lua/lazyvim/util/deprecated.lua
@@ -1,3 +1,4 @@
+---@class lazyvim.util.deprecated
 local M = {}
 
 M.moved = {
@@ -13,6 +14,7 @@ M.moved = {
   ui = {
     statuscolumn = { "Snacks.statuscolumn" },
     bufremove = { "Snacks.bufdelete" },
+    foldexpr = { "LazyVim.treesitter.foldexpr", stacktrace = false },
     fg = {
       "{ fg = Snacks.util.color(...) }",
       fn = function(...)
@@ -28,7 +30,7 @@ function M.decorate(name, mod)
   if not M.moved[name] then
     return mod
   end
-  setmetatable(mod, {
+  return setmetatable(mod, {
     __call = function(_, ...)
       local to = M.moved[name].__call[1]
       LazyVim.deprecate("LazyVim." .. name, to)
@@ -38,7 +40,9 @@ function M.decorate(name, mod)
     __index = function(_, k)
       if M.moved[name][k] then
         local to = M.moved[name][k][1]
-        LazyVim.deprecate("LazyVim." .. name .. "." .. k, to)
+        LazyVim.deprecate("LazyVim." .. name .. "." .. k, to, {
+          stacktrace = M.moved[name][k].stacktrace,
+        })
         if M.moved[name][k].fn then
           return M.moved[name][k].fn
         end
@@ -55,6 +59,10 @@ function M.lazygit()
   return Snacks.lazygit
 end
 
+function M.ui()
+  return M.decorate("ui", {})
+end
+
 function M.toggle()
   LazyVim.deprecate("LazyVim.toggle", "Snacks.toggle")
   return {
diff --git a/lua/lazyvim/util/init.lua b/lua/lazyvim/util/init.lua
index 339fdadb..7561b385 100644
--- a/lua/lazyvim/util/init.lua
+++ b/lua/lazyvim/util/init.lua
@@ -2,7 +2,7 @@ local LazyUtil = require("lazy.core.util")
 
 ---@class lazyvim.util: LazyUtilCore
 ---@field config LazyVimConfig
----@field ui lazyvim.util.ui
+---@field treesitter lazyvim.util.treesitter
 ---@field lsp lazyvim.util.lsp
 ---@field root lazyvim.util.root
 ---@field terminal lazyvim.util.terminal
@@ -16,14 +16,16 @@ local LazyUtil = require("lazy.core.util")
 ---@field mini lazyvim.util.mini
 ---@field pick lazyvim.util.pick
 ---@field cmp lazyvim.util.cmp
+---@field deprecated lazyvim.util.deprecated
 local M = {}
+M.deprecated = require("lazyvim.util.deprecated")
 
 setmetatable(M, {
   __index = function(t, k)
     if LazyUtil[k] then
       return LazyUtil[k]
     end
-    if k == "lazygit" or k == "toggle" then -- HACK: special case for lazygit
+    if M.deprecated[k] then
       return M.deprecated[k]()
     end
     ---@diagnostic disable-next-line: no-unknown
@@ -125,13 +127,17 @@ function M.opts(name)
   return Plugin.values(plugin, "opts", false)
 end
 
-function M.deprecate(old, new)
-  M.warn(("`%s` is deprecated. Please use `%s` instead"):format(old, new), {
-    title = "LazyVim",
-    once = true,
-    stacktrace = true,
-    stacklevel = 6,
-  })
+---@param opts? LazyNotifyOpts
+function M.deprecate(old, new, opts)
+  M.warn(
+    ("`%s` is deprecated. Please use `%s` instead"):format(old, new),
+    vim.tbl_extend("force", {
+      title = "LazyVim",
+      once = true,
+      stacktrace = true,
+      stacklevel = 6,
+    }, opts or {})
+  )
 end
 
 -- delay notifications till vim.notify was replaced or after 500ms
diff --git a/lua/lazyvim/util/ui.lua b/lua/lazyvim/util/treesitter.lua
similarity index 51%
rename from lua/lazyvim/util/ui.lua
rename to lua/lazyvim/util/treesitter.lua
index 19d5642e..84e279ce 100644
--- a/lua/lazyvim/util/ui.lua
+++ b/lua/lazyvim/util/treesitter.lua
@@ -1,12 +1,23 @@
----@class lazyvim.util.ui
+---@class lazyvim.util.treesitter
 local M = {}
 
-M.installed = {} ---@type string[]
+M._installed = nil ---@type table<string,string>?
+
+---@param force boolean?
+function M.get_installed(force)
+  if not M._installed or force then
+    M._installed = {}
+    for _, lang in ipairs(require("nvim-treesitter").get_installed("parsers")) do
+      M._installed[lang] = lang
+    end
+  end
+  return M._installed
+end
 
 ---@param ft string
 function M.have(ft)
   local lang = vim.treesitter.language.get_lang(ft)
-  return vim.tbl_contains(M.installed, lang)
+  return lang and M.get_installed()[lang]
 end
 
 function M.foldexpr()