Use a dummy include to indicate TGUI isn't built (tgstation#56470)

.gitignore

@@ -234,3 +234,4 @@ tools/LinuxOneShot/TGS_Logs
 
 # Common build tooling
 !/tools/build
+code/modules/tgui/USE_BUILD_BAT_INSTEAD_OF_DREAM_MAKER.dm

code/modules/tgui/tgui.dm

@@ -3,6 +3,11 @@
  * SPDX-License-Identifier: MIT
  */
 
+#ifndef SPACEMAN_DMM
+// Empty file generated by tgui build. Makes the problem clearer if it hasn't been built.
+#include "USE_BUILD_BAT_INSTEAD_OF_DREAM_MAKER.dm"
+#endif
+
 /**
  * tgui datum (represents a UI).
  */

tgui/bin/tgui

@@ -54,6 +54,7 @@ task-install() {
 task-webpack() {
   cd "${base_dir}"
   yarn run webpack-cli "${@}"
+  touch "../code/modules/tgui/USE_BUILD_BAT_INSTEAD_OF_DREAM_MAKER.dm"
 }
 
 ## Runs a development server
@@ -88,6 +89,8 @@ task-clean() {
   ## NPM artifacts
   rm -rf **/node_modules
   rm -f **/package-lock.json
+  ## Dummy DM
+  rm -f ../code/modules/tgui/USE_BUILD_BAT_INSTEAD_OF_DREAM_MAKER.dm
 }
 
 ## Installs merge drivers and git hooks

tgui/bin/tgui_.ps1

@@ -43,6 +43,7 @@ function task-install {
 ## Runs webpack
 function task-webpack {
   yarn run webpack-cli @Args
+  New-Item -ItemType file "../code/modules/tgui/USE_BUILD_BAT_INSTEAD_OF_DREAM_MAKER.dm"
 }
 
 ## Runs a development server

tools/build/build.js

@@ -26,6 +26,7 @@ const taskTgui = new Task('tgui')
   .provides('tgui/public/tgui-common.bundle.js')
   .provides('tgui/public/tgui-panel.bundle.css')
   .provides('tgui/public/tgui-panel.bundle.js')
+  .provides('code/modules/tgui/USE_BUILD_BAT_INSTEAD_OF_DREAM_MAKER.dm')
   .build(async () => {
     // Instead of calling `tgui/bin/tgui`, we reproduce the whole pipeline
     // here for maximum compilation speed.