fixed issue with the Js compiler being unable to use the system tmp d…

…irectory, using the one in storage is much safer across different operating systems

src/Frontend/Compiler/JsCompiler.php

@@ -58,7 +58,7 @@ protected function save(string $file, array $sources): bool
 
         $this->assetsDir->put($file, implode("\n", $output));
 
-        $mapTemp = tempnam(sys_get_temp_dir(), $mapFile);
+        $mapTemp = tempnam(storage_path('tmp'), $mapFile);
         $map->save($mapTemp);
         $this->assetsDir->put($mapFile, file_get_contents($mapTemp));
         @unlink($mapTemp);