chore: add type annotations and resolve LSP warnings (#2555)

* chore: add type annotations to (almost) all functions

* stylua

* Add classes for symlink nodes

* Replace deprecated `@vararg`

* Move node classes to `node` module

* Fix `Symlink*` classes

* add vim and libuv runtime for luals, qualify libuv types

* add scripts/luals-check, not quite ready for CI

* additional nil checks for git/init.lua and git/runner.lua

* additional nil checks for nvim-tree.lua

* wrap vim.cmd-as-a-function calls inside functions

* vim.tbl_filter predicate returns booleans

* Revert "add scripts/luals-check, not quite ready for CI"

This reverts commit c70229cad9.

* Add `MinimalNode` class in `marks` module

* Fix various LSP warnings

* stylua

* Fix `Explorer` class, update related annotations and add necessary checks

* Add missing annotations to `live-filter`

* Add temporary aliases for `uv.*` types

* Resolve remaining LSP warnings

* Revert changes not related to internal types

* Minor adjustments

* Update doc comments style

* Minor adjustments (pt. 2)

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/actions/reloaders/reloaders.lua

@@ -8,6 +8,9 @@ local Iterator = require "nvim-tree.iterators.node-iterator"
 
 local M = {}
 
+---@param node Explorer|nil
+---@param projects table
+---@param unloaded_bufnr number|nil
 local function refresh_nodes(node, projects, unloaded_bufnr)
   Iterator.builder({ node })
     :applier(function(n)
@@ -22,7 +25,13 @@ local function refresh_nodes(node, projects, unloaded_bufnr)
     :iterate()
 end
 
+---@param parent_node Node|nil
+---@param projects table
 function M.reload_node_status(parent_node, projects)
+  if parent_node == nil then
+    return
+  end
+
   local toplevel = git.get_toplevel(parent_node.absolute_path)
   local status = projects[toplevel] or {}
   for _, node in ipairs(parent_node.nodes) do