anchor.diff:  
     zdotdir = "$HOME/" + cfg.dotDir;
   
  -  historyModule = types.submodule {
  +  historyModule = types.submodule ({ config, ... }: {
       options = {
         size = mkOption {
           type = types.int;
  
positive.code:         description = "Number of history lines to keep.";
        };
  
        path = mkOption {
          type = types.str;
          default = relToDotDir ".zsh_history";
  
negative.code:         description = "Share command history between zsh sessions.";
        };
      };
    });
  
    pluginModule = types.submodule ({ config, ... }: {
      options = {
  