write all definitions of theorems to aux file at end of document

src/environments/groupthm/groupthm.dtx

@@ -851,6 +851,16 @@
   {
     \tl_log:n { Declaring ~ thmtools ~ theorem ~ #2 }
     \declaretheorem [ #1 ] { #2 }
+    \bool_if:NT \g_@@_cache_bool
+      {
+        \hook_gput_code:nnn { enddocument / afterlastpage } { groupthm }
+          {
+           \iow_now:cn { @auxout }
+             {
+               \declaretheorem [ #1 ] { #2 }
+             }
+           }
+      }
   }
 \cs_generate_variant:Nn \@@_thmtools_declare_theorem:nn { V n }
 %    \end{macrocode}
@@ -858,6 +868,7 @@
 %
 %
 %
+%
 % It also comes in handy to have a stronger version of the 
 % hook role setting mechanism:
 % \begin{macro}{\@@_hook_gset_rule_foreach:nNnn}
@@ -2676,6 +2687,30 @@
 %    \end{macrocode}  
 % 
 %
+% \begin{macro}{\@@_fake_declare_theorem:w}
+%    \begin{syntax}
+%       
+%    \end{syntax}
+%		 
+%     This is a fake version of the \cs{declaretheorem} macro
+%     that accepts the arguments but does nothing.
+%
+%    \begin{macrocode}
+\NewDocumentCommand { \@@_fake_declare_theorem:w }{ o m }
+  {
+    \relax
+  }
+%    \end{macrocode}
+% \end{macro}
+% 
+% 
+% 
+%    \begin{macrocode}
+\hook_gput_code:nnn { enddocument / afterlastpage } { groupthm }
+  {
+    \let \declaretheorem \@@_fake_declare_theorem:w
+  }
+%    \end{macrocode}
 % 
 % 
 %    \begin{macrocode}