diff --git a/.github/workflows/check-clean-git-state.sh b/.github/workflows/check-clean-git-state.sh
new file mode 100755
index 00000000000..cd09d4db30c
--- /dev/null
+++ b/.github/workflows/check-clean-git-state.sh
@@ -0,0 +1,6 @@
+R=`git status --porcelain | wc -l`
+if [ "$R" -ne "0" ]; then
+  echo "The git repo is not clean after compiling the /build/ folder. Did you forget to commit .js output for .ts files?";
+  git status --porcelain
+  exit 1;
+fi
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3dc90355056..eae2e162606 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -298,6 +298,12 @@ jobs:
       - name: Run Valid Layers Checks
         run: yarn valid-layers-check
 
+      - name: Compile /build/
+        run: yarn --cwd build compile
+
+      - name: Check clean git state
+        run: ./.github/workflows/check-clean-git-state.sh
+
       - name: Run eslint
         run: yarn eslint