diff --git a/pkgs/lazyUtils.nix b/pkgs/lazyUtils.nix
index 3d074ef..53bb823 100644
--- a/pkgs/lazyUtils.nix
+++ b/pkgs/lazyUtils.nix
@@ -60,6 +60,10 @@ let
         cmdIsFunction ? false,
         opts ? null,
       }:
+      assert builtins.isString bind;
+      assert builtins.isNull cmd || builtins.isString cmd;
+      assert builtins.isBool cmdIsFunction;
+      assert builtins.isNull opts || builtins.isAttrs opts;
       lib.filter (option: !builtins.isNull option) [
         bind
         (if (cmdIsFunction == true) && (builtins.isString cmd) then (_: cmd) else cmd)