fix(loader): reset hashes when running the loader

runtime/lua/vim/loader.lua

@@ -5,7 +5,7 @@ local loaders = package.loaders
 
 local M = {}
 
----@alias CacheHash {mtime: {sec:number, nsec:number}, size:number, type: string}
+---@alias CacheHash {mtime: {nsec: integer, sec: integer}, size: integer, type?: uv.aliases.fs_stat_types}
 ---@alias CacheEntry {hash:CacheHash, chunk:string}
 
 ---@class ModuleFindOpts
@@ -28,12 +28,11 @@ M.enabled = false
 ---@field _rtp string[]
 ---@field _rtp_pure string[]
 ---@field _rtp_key string
+---@field _hashes? table<string, CacheHash>
 local Loader = {
   VERSION = 3,
   ---@type table<string, table<string,ModuleInfo>>
   _indexed = {},
-  ---@type table<string, CacheHash>
-  _hashes = {},
   ---@type table<string, string[]>
   _topmods = {},
   _loadfile = loadfile,
@@ -44,9 +43,13 @@ local Loader = {
 }
 
 --- @param path string
---- @return uv.fs_stat.result
+--- @return CacheHash
 --- @private
 function Loader.get_hash(path)
+  if not Loader._hashes then
+    return uv.fs_stat(path) --[[@as CacheHash]]
+  end
+
   if not Loader._hashes[path] then
     -- Note we must never save a stat for a non-existent path.
     -- For non-existent paths fs_stat() will return nil.
@@ -163,13 +166,16 @@ end
 ---@return string|function
 ---@private
 function Loader.loader(modname)
+  Loader._hashes = {}
   local ret = M.find(modname)[1]
   if ret then
     -- Make sure to call the global loadfile so we respect any augmentations done elsewhere.
     -- E.g. profiling
     local chunk, err = loadfile(ret.modpath)
+    Loader._hashes = nil
     return chunk or error(err)
   end
+  Loader._hashes = nil
   return '\ncache_loader: module ' .. modname .. ' not found'
 end
 
@@ -373,7 +379,9 @@ function M.reset(path)
   end
 
   -- Path could be a directory so just clear all the hashes.
-  Loader._hashes = {}
+  if Loader._hashes then
+    Loader._hashes = {}
+  end
 end
 
 --- Enables the experimental Lua module loader: