chore: add type annotations to (almost) all functions

lua/nvim-tree/actions/moves/item.lua

@@ -6,6 +6,9 @@ local explorer_node = require "nvim-tree.explorer.node"
 
 local M = {}
 
+---@param where string
+---@param what string
+---@return fun()
 function M.fn(where, what)
   return function()
     local node_cur = lib.get_node_at_cursor()

lua/nvim-tree/actions/moves/parent.lua

@@ -6,6 +6,8 @@ local lib = require "nvim-tree.lib"
 
 local M = {}
 
+---@param should_close boolean|nil
+---@return fun(node: Node): boolean|nil
 function M.fn(should_close)
   should_close = should_close or false
 

lua/nvim-tree/actions/moves/sibling.lua

@@ -4,6 +4,8 @@ local Iterator = require "nvim-tree.iterators.node-iterator"
 
 local M = {}
 
+---@param direction string
+---@return fun(node: Node): nil
 function M.fn(direction)
   return function(node)
     if node.name == ".." or not direction then