diff --git a/lua/outline/folding.lua b/lua/outline/folding.lua
index 507c688..f8145e7 100644
--- a/lua/outline/folding.lua
+++ b/lua/outline/folding.lua
@@ -1,7 +1,7 @@
 local M = {}
 local cfg = require('outline.config')
 
----@param node outline.SymbolNode|outline.FlatSymbolNode
+---@param node outline.Symbol|outline.FlatSymbol
 function M.is_foldable(node)
   return node.children and #node.children > 0
 end
@@ -16,7 +16,7 @@ local function get_default_folded(depth)
   end
 end
 
----@param node outline.SymbolNode|outline.FlatSymbolNode
+---@param node outline.Symbol|outline.FlatSymbol
 function M.is_folded(node)
   local hover = cfg.o.symbol_folding.auto_unfold_hover
   local only = cfg.o.symbol_folding.auto_unfold.only
diff --git a/lua/outline/highlight.lua b/lua/outline/highlight.lua
index 647beda..514c1f3 100644
--- a/lua/outline/highlight.lua
+++ b/lua/outline/highlight.lua
@@ -20,7 +20,7 @@ end
 
 ---Add single hover highlights
 ---@param bufnr integer
----@param nodes outline.FlatSymbolNode[]
+---@param nodes outline.FlatSymbol[]
 function M.hovers(bufnr, nodes)
   for line, node in ipairs(nodes) do
     if node.hovered then
diff --git a/lua/outline/parser.lua b/lua/outline/parser.lua
index b24b9de..6eafad7 100644
--- a/lua/outline/parser.lua
+++ b/lua/outline/parser.lua
@@ -9,12 +9,12 @@ local M = {}
 ---Parses result from LSP into a reorganized tree of symbols (not flattened,
 -- simply reoganized by merging each property table from the arguments into a
 -- table for each symbol)
----@param result table The result from a language server.
+---@param result outline.ProviderSymbol The result from a language server.
 ---@param depth number? The current depth of the symbol in the hierarchy.
 ---@param hierarchy table? A table of booleans which tells if a symbols parent was the last in its group.
 ---@param parent table? A reference to the current symbol's parent in the function's recursion
 ---@param bufnr integer The buffer number which the result was from
----@return outline.SymbolNode[]
+---@return outline.Symbol[]
 local function parse_result(result, depth, hierarchy, parent, bufnr)
   local ret = {}
 
@@ -48,7 +48,7 @@ local function parse_result(result, depth, hierarchy, parent, bufnr)
         isLast = isLast,
         hierarchy = hir,
         parent = parent,
-        traversal_child = 1,
+        _i = 1,
       }
 
       table.insert(ret, node)
@@ -74,7 +74,7 @@ end
 ---Used when refreshing and setting up new symbols
 ---@param response table The result from buf_request_all
 ---@param bufnr integer
----@return outline.SymbolNode[]
+---@return outline.Symbol[]
 function M.parse(response, bufnr)
   local sorted = lsp_utils.sort_symbols(response)
 
@@ -83,11 +83,11 @@ end
 
 ---Iterator that traverses the tree parent first before children, returning each node.
 -- Essentailly 'flatten' items, but returns an iterator.
----@param items outline.SymbolNode[] Tree of symbols parsed by parse_result
+---@param items outline.Symbol[] Tree of symbols parsed by parse_result
 ---@param children_check function? Takes a node and return whether the children should be explored.
 ---Note that the root node (param items) is always explored regardless of children_check.
 function M.preorder_iter(items, children_check)
-  local node = { children = items, traversal_child = 1, depth = 1, is_root = true }
+  local node = { children = items, _i = 1, depth = 1, is_root = true }
   local prev
   local visited = {}
 
@@ -104,19 +104,15 @@ function M.preorder_iter(items, children_check)
         return node
       end
 
-      if
-        node.children
-        and node.traversal_child <= #node.children
-        and (node.is_root or children_check(node))
-      then
+      if node.children and node._i <= #node.children and (node.is_root or children_check(node)) then
         prev = node
-        if node.children[node.traversal_child] then
-          node.children[node.traversal_child].parent_node = node
-          node = node.children[node.traversal_child]
+        if node.children[node._i] then
+          node.children[node._i].parent_node = node
+          node = node.children[node._i]
         end
-        prev.traversal_child = prev.traversal_child + 1
+        prev._i = prev._i + 1
       else
-        node.traversal_child = 1
+        node._i = 1
         node = node.parent_node
       end
     end
diff --git a/lua/outline/providers/init.lua b/lua/outline/providers/init.lua
index e18f001..c059e10 100644
--- a/lua/outline/providers/init.lua
+++ b/lua/outline/providers/init.lua
@@ -1,5 +1,3 @@
-local cfg = require('outline.config')
-
 local M = {}
 local import_prefix = 'outline/providers/'
 
@@ -8,7 +6,7 @@ function M.find_provider()
   if not M.providers then
     M.providers = vim.tbl_map(function(p)
       return import_prefix .. p
-    end, cfg.get_providers())
+    end, require('outline.config').get_providers())
   end
   for _, path in ipairs(M.providers) do
     local provider = require(path)
diff --git a/lua/outline/providers/markdown.lua b/lua/outline/providers/markdown.lua
index 2b40d28..b5c5683 100644
--- a/lua/outline/providers/markdown.lua
+++ b/lua/outline/providers/markdown.lua
@@ -15,7 +15,6 @@ local M = {
   name = 'markdown',
 }
 
-
 ---@return boolean ft_is_markdown
 function M.supports_buffer(bufnr)
   return vim.api.nvim_buf_get_option(bufnr, 'ft') == 'markdown'
@@ -32,7 +31,7 @@ end
 
 -- Parses markdown files and returns a table of SymbolInformation[] which is
 -- used by the plugin to show the outline.
----@return table
+---@return outline.ProviderSymbol[]
 function M.handle_markdown()
   local lines = vim.api.nvim_buf_get_lines(0, 0, -1, false)
   local level_symbols = { { children = {} } }
@@ -119,7 +118,7 @@ function M.handle_markdown()
   return level_symbols[1].children
 end
 
----@param on_symbols function
+---@param on_symbols fun(symbols?:outline.ProviderSymbol[], opts?:table)
 ---@param opts table
 function M.request_symbols(on_symbols, opts)
   on_symbols(M.handle_markdown(), opts)
diff --git a/lua/outline/providers/norg.lua b/lua/outline/providers/norg.lua
index 451e8cd..0e0b0f0 100644
--- a/lua/outline/providers/norg.lua
+++ b/lua/outline/providers/norg.lua
@@ -53,6 +53,8 @@ if not _G._outline_nvim_has[8] then
   end
 end
 
+---@param node outline.ProviderSymbol
+---@param field string
 local function rec_remove_field(node, field)
   node[field] = nil
   if node.children then
@@ -62,6 +64,8 @@ local function rec_remove_field(node, field)
   end
 end
 
+---@param callback fun(symbols?:outline.ProviderSymbol[], opts?:table)
+---@param opts table
 function M.request_symbols(callback, opts)
   if not M.parser then
     local status, parser = pcall(vim.treesitter.get_parser, 0, 'norg')
diff --git a/lua/outline/providers/nvim-lsp.lua b/lua/outline/providers/nvim-lsp.lua
index 2749da8..f0c27a5 100644
--- a/lua/outline/providers/nvim-lsp.lua
+++ b/lua/outline/providers/nvim-lsp.lua
@@ -15,10 +15,6 @@ function M.get_status()
   return { 'client: ' .. M.client.name }
 end
 
-local function get_params()
-  return { textDocument = vim.lsp.util.make_text_document_params() }
-end
-
 function M.hover_info(bufnr, params, on_info)
   local clients = vim.lsp.get_active_clients({ bufnr = bufnr })
   local use_client
@@ -49,6 +45,7 @@ function M.hover_info(bufnr, params, on_info)
   use_client.request('textDocument/hover', params, on_info, bufnr)
 end
 
+---@return boolean
 function M.supports_buffer(bufnr)
   local clients = vim.lsp.get_active_clients({ bufnr = bufnr })
   local ret = false
@@ -69,6 +66,8 @@ function M.supports_buffer(bufnr)
   return ret
 end
 
+---@param response outline.ProviderSymbol[]
+---@return outline.ProviderSymbol[]
 local function postprocess_symbols(response)
   local symbols = lsp_utils.flatten_response(response)
 
@@ -81,9 +80,13 @@ local function postprocess_symbols(response)
   end
 end
 
----@param on_symbols function
+---@param on_symbols fun(symbols?:outline.ProviderSymbol[], opts?:table)
+---@param opts table
 function M.request_symbols(on_symbols, opts)
-  vim.lsp.buf_request_all(0, 'textDocument/documentSymbol', get_params(), function(response)
+  local params = {
+    textDocument = vim.lsp.util.make_text_document_params(),
+  }
+  vim.lsp.buf_request_all(0, 'textDocument/documentSymbol', params, function(response)
     response = postprocess_symbols(response)
     on_symbols(response, opts)
   end)
diff --git a/lua/outline/sidebar.lua b/lua/outline/sidebar.lua
index 8715947..6513a0e 100644
--- a/lua/outline/sidebar.lua
+++ b/lua/outline/sidebar.lua
@@ -17,9 +17,9 @@ local Sidebar = {}
 
 ---@class outline.Sidebar
 ---@field view outline.View
----@field items outline.SymbolNode[]
----@field flats outline.FlatSymbolNode[]
----@field hovered outline.FlatSymbolNode[]
+---@field items outline.Symbol[]
+---@field flats outline.FlatSymbol[]
+---@field hovered outline.FlatSymbol[]
 ---@field original_cursor string
 ---@field code outline.SidebarCodeState
 ---@field autocmds { [integer]: integer } winnr to autocmd id
@@ -68,7 +68,7 @@ function Sidebar:destroy()
 end
 
 ---Handler for provider request_symbols when outline is opened for the first time.
----@param response table?
+---@param response outline.ProviderSymbol[]?
 ---@param opts outline.OutlineOpts?
 function Sidebar:initial_handler(response, opts)
   if response == nil or type(response) ~= 'table' or self.view:is_open() then
@@ -110,7 +110,7 @@ end
 ---Convenience function for setup_keymaps
 ---@param cfg_name string Field in cfg.o.keymaps
 ---@param method string|function If string, field in Sidebar
----@param args table Passed to method
+---@param args any[] Passed to method
 function Sidebar:nmap(cfg_name, method, args)
   local keys = cfg.o.keymaps[cfg_name]
   local fn
@@ -255,7 +255,7 @@ function Sidebar:reset_cursor_style()
 end
 
 ---Set the cursor to current.line_in_outline and column to a convenient place
----@param current outline.FlatSymbolNode?
+---@param current outline.FlatSymbol?
 function Sidebar:update_cursor_pos(current)
   local col = 0
   local buf = vim.api.nvim_win_get_buf(self.code.win)
@@ -271,7 +271,7 @@ end
 ---Calls build_outline and then calls update_cursor_pos if update_cursor is
 ---not false
 ---@param update_cursor boolean?
----@param set_cursor_to_node outline.SymbolNode|outline.FlatSymbolNode?
+---@param set_cursor_to_node outline.Symbol|outline.FlatSymbol?
 function Sidebar:_update_lines(update_cursor, set_cursor_to_node)
   local current = self:build_outline(set_cursor_to_node)
   if update_cursor ~= false then
@@ -280,6 +280,7 @@ function Sidebar:_update_lines(update_cursor, set_cursor_to_node)
 end
 
 ---Handler for provider request_symbols for refreshing outline
+---@param response outline.ProviderSymbol[]
 function Sidebar:refresh_handler(response)
   if response == nil or type(response) ~= 'table' then
     return
@@ -308,7 +309,7 @@ function Sidebar:refresh_handler(response)
   self:_update_lines(update_cursor)
 end
 
----@param items outline.SymbolNode[]
+---@param items outline.Symbol[]
 function Sidebar:_merge_items(items)
   parser.merge_items_rec({ children = items }, { children = self.items })
 end
@@ -335,7 +336,7 @@ end
 -- stylua: ignore end
 
 ---Currently hovered node in outline
----@return outline.FlatSymbolNode
+---@return outline.FlatSymbol
 function Sidebar:_current_node()
   local current_line = vim.api.nvim_win_get_cursor(self.view.win)[1]
   return self.flats[current_line]
@@ -432,7 +433,7 @@ function Sidebar:_set_folded(folded, move_cursor, node_index)
   end
 end
 
----@param nodes outline.SymbolNode[]
+---@param nodes outline.Symbol[]
 function Sidebar:_toggle_all_fold(nodes)
   nodes = nodes or self.items
   local folded = true
@@ -448,7 +449,7 @@ function Sidebar:_toggle_all_fold(nodes)
 end
 
 ---@param folded boolean?
----@param nodes? outline.SymbolNode[]
+---@param nodes? outline.Symbol[]
 function Sidebar:_set_all_folded(folded, nodes)
   local stack = { nodes or self.items }
   local current = self:_current_node()
@@ -639,12 +640,12 @@ end
 ---@note Ensure new outlines are already set to `self.items` before calling
 ---this function. `self.flats` will be overwritten and current line is obtained
 ---from `win_get_cursor` using `self.code.win`.
----@param find_node outline.FlatSymbolNode|outline.SymbolNode? Find a given node rather than node matching cursor position in codewin
----@return outline.FlatSymbolNode? set_cursor_to_this_node
+---@param find_node outline.FlatSymbol|outline.Symbol? Find a given node rather than node matching cursor position in codewin
+---@return outline.FlatSymbol? set_cursor_to_this_node
 function Sidebar:build_outline(find_node)
   ---@type integer 0-indexed
   local hovered_line = vim.api.nvim_win_get_cursor(self.code.win)[1] - 1
-  ---@type outline.FlatSymbolNode Deepest visible matching node to set cursor
+  ---@type outline.FlatSymbol Deepest visible matching node to set cursor
   local put_cursor
   self.flats = {}
   local line_count = 0
diff --git a/lua/outline/types/outline.lua b/lua/outline/types/outline.lua
index 7ddb735..1f029bd 100644
--- a/lua/outline/types/outline.lua
+++ b/lua/outline/types/outline.lua
@@ -22,28 +22,23 @@
 
 -- SYMBOLS
 
----@class outline.SymbolNode
+---@class outline.ProviderSymbol
 ---@field name string
----@field depth integer
----@field parent outline.SymbolNode
----@field deprecated boolean
----@field kind integer|string
----@field icon string
----@field detail string
----@field line integer
----@field character integer
----@field range_start integer
----@field range_end integer
----@field isLast boolean
----@field hierarchy boolean
----@field children? outline.SymbolNode[]
----@field traversal_child integer Should NOT be modified during iteration using parser.preorder_iter
----@field is_root boolean?
+---@field kind integer
+---@field detail? string
+---@field range outline.ProviderSymbolRange
+---@field selectionRange outline.ProviderSymbolRange
+---@field parent outline.ProviderSymbol
+---@field children outline.ProviderSymbol[]
 
----@class outline.FlatSymbolNode
+---@class outline.ProviderSymbolRange
+---@field start integer
+---@field end integer
+
+---@class outline.Symbol
 ---@field name string
 ---@field depth integer
----@field parent outline.FlatSymbolNode
+---@field parent outline.Symbol
 ---@field deprecated boolean
 ---@field kind integer|string
 ---@field icon string
@@ -54,9 +49,11 @@
 ---@field range_end integer
 ---@field isLast boolean
 ---@field hierarchy boolean
----@field children? outline.FlatSymbolNode[]
----@field traversal_child integer
----@field is_root boolean?
+---@field children? outline.Symbol[]
+---@field _i integer Should NOT be modified during iteration using parser.preorder_iter
+---@field is_root? boolean
+
+---@class outline.FlatSymbol : outline.Symbol
 ---@field line_in_outline integer
 ---@field prefix_length integer
 ---@field hovered boolean
@@ -68,7 +65,7 @@
 ---@field name string
 ---@field get_status? fun():string[]
 ---@field supports_buffer fun(bufnr:integer):boolean
----@field request_symbols fun(on_symbols:function, opts:table?)
+---@field request_symbols fun(on_symbols:fun(symbols?:outline.ProviderSymbol[], opts:table?), opts:table?)
 ---@field hover_info? fun(bufnr:integer, params:table, on_info:function)
 ---@field rename_symbol? fun(sidebar:outline.Sidebar)
 ---@field code_actions? fun(sidebar:outline.Sidebar)
diff --git a/lua/outline/view.lua b/lua/outline/view.lua
index 183bf31..7d73f4a 100644
--- a/lua/outline/view.lua
+++ b/lua/outline/view.lua
@@ -98,7 +98,7 @@ end
 
 ---Ensure all existing highlights are already cleared before calling!
 ---@param hl outline.HL[]
----@param nodes outline.FlatSymbolNode[]
+---@param nodes outline.FlatSymbol[]
 ---@param details string[]
 ---@param linenos string[]
 function View:add_hl_and_ns(hl, nodes, details, linenos)