diff --git a/flake.nix b/flake.nix
index 37eb38c..f0a860a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,6 +21,12 @@
           gnumake
           emscripten
         ];
+
+        shell = "${pkgs.bash}/bin/bash";
+
+        shellHook = ''
+          function makejs { make -f Makefile.js $@; }
+        '';
       };
   };
 }