ddterm packages from extensions.gnome.org can't be used on NixOS as is - because gjs is not in PATH.
nixpkgs provides a patched version, but it will always lag behind.
As far as I understand, it's possible to add some *.nix files to the git repository to make it usable directly - like https://github.com/ddterm/gnome-shell-extension-ddterm/blob/master/PKGBUILD for Arch
ddterm packages from extensions.gnome.org can't be used on NixOS as is - because
gjsis not inPATH.nixpkgs provides a patched version, but it will always lag behind.
As far as I understand, it's possible to add some
*.nixfiles to the git repository to make it usable directly - like https://github.com/ddterm/gnome-shell-extension-ddterm/blob/master/PKGBUILD for Arch