typechecked optargs constructors for watcher and event

lua/nvim-tree/explorer/init.lua

@@ -38,7 +38,7 @@ local config
 local Explorer = RootNode:extend()
 
 ---@class Explorer
----@overload fun(opts: ExplorerArgs): Explorer
+---@overload fun(args: ExplorerArgs): Explorer
 
 ---@class (exact) ExplorerArgs
 ---@field path string

lua/nvim-tree/explorer/watch.lua

@@ -83,8 +83,12 @@ function M.create_watcher(node)
   end
 
   M.uid = M.uid + 1
-  return Watcher:create(path, nil, callback, {
-    context = "explorer:watch:" .. path .. ":" .. M.uid,
+  return Watcher:create({
+    path = path,
+    callback = callback,
+    data = {
+      context = "explorer:watch:" .. path .. ":" .. M.uid
+    }
   })
 end