diff --git a/bhl.inc.php b/bhl.inc.php
index 147db10..bc335ed 100644
--- a/bhl.inc.php
+++ b/bhl.inc.php
@@ -1,7 +1,6 @@
 <?php
 namespace taskman;
 use Exception;
-use stdClass;
 
 task('bhl_clean', function()
 {
@@ -22,7 +21,21 @@ function bhl_proj_file()
   return get('BHL_PROJ_FILE');
 }
 
-function bhl_proj(?string $proj_file = null)
+class BhlProj
+{
+  public string $file_path;
+  public array $src_dirs = array();
+  public array $bindings_sources;
+  public array $postproc_sources;
+  public string $postproc_dll;
+  public string $result_file;
+  public string $error_file;
+  public string $tmp_dir;
+  public int $max_threads;
+  public bool $deterministic;
+}
+
+function bhl_proj(?string $proj_file = null) : BhlProj
 {
   global $GAME_ROOT;
 
@@ -32,10 +45,14 @@ function bhl_proj(?string $proj_file = null)
 
   if(!isset($projs[$proj_file]))
   {
-    $proj = json_decode(ensure_read($proj_file));
-    if(!$proj)
+    $arr = json_decode(ensure_read($proj_file), true);
+    if(!$arr)
       throw new Exception("Bad bhl project file: $proj_file");
 
+    $proj = new BhlProj();
+    foreach($arr as $k => $v) 
+      $proj->{$k} = $v;
+
     $proj->file_path = $proj_file; //NOTE: adding path to the file for convenience
 
     foreach($proj->src_dirs as $k => $v)
@@ -71,7 +88,7 @@ function _bhl_make_abs_path($proj_file, $path)
     return $path;
 }
 
-function bhl_result_file(stdClass $bhl_proj = null)
+function bhl_result_file(BhlProj $bhl_proj = null)
 {
   $bhl_proj ??= bhl_proj();
   return $bhl_proj->result_file;
@@ -104,13 +121,13 @@ function bhl_shell_ensure($cmd)
     throw new Exception("Error executing shell cmd: $ret_var");
 }
 
-function bhl_scan_files(stdClass $bhl_proj = null)
+function bhl_scan_files(BhlProj $bhl_proj = null)
 {
   $bhl_proj ??= bhl_proj();
   return scan_files_rec($bhl_proj->src_dirs, array('.bhl'));
 }
 
-function bhl_run($debug = true, $force = false, $exit_on_err = true, stdClass $bhl_proj = null)
+function bhl_run($debug = true, $force = false, $exit_on_err = true, BhlProj $bhl_proj = null)
 {
   global $GAME_ROOT;
 
@@ -173,13 +190,13 @@ function bhl_handle_error_result(array $ret_out, $err_file, $exit = true)
     exit(1);
 }
 
-function bhl_clean(stdClass $bhl_proj = null)
+function bhl_clean(BhlProj $bhl_proj = null)
 {
   bhl_clean_cache($bhl_proj);
   bhl_shell_ensure("clean");
 }
 
-function bhl_clean_cache(stdClass $bhl_proj = null)
+function bhl_clean_cache(BhlProj $bhl_proj = null)
 {
   $bhl_proj ??= bhl_proj();
   ensure_rm($bhl_proj->tmp_dir);
@@ -218,7 +235,7 @@ function bhl_line_row_to_pos($file, $line, $row)
   return $pos;
 }
 
-function bhl_map_module_to_file($module, stdClass $bhl_proj = null)
+function bhl_map_module_to_file($module, BhlProj $bhl_proj = null)
 {
   $bhl_proj ??= bhl_proj();
   foreach($bhl_proj->src_dirs as $dir)