diff --git a/bin/assert-no-changes-wrapper.sh b/bin/assert-no-changes-wrapper.sh
new file mode 100755
index 0000000..a9ee515
--- /dev/null
+++ b/bin/assert-no-changes-wrapper.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+GQL_DIR=$(dirname $(dirname "$(realpath "$BASH_SOURCE")"))
+
+cd $GQL_DIR
+
+nix develop --impure --command bash "$GQL_DIR/bin/assert-no-changes.sh"
diff --git a/bin/assert-no-changes.sh b/bin/assert-no-changes.sh
new file mode 100755
index 0000000..e19f366
--- /dev/null
+++ b/bin/assert-no-changes.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+git ls-files | xargs md5sum > before.txt
+
+yarn install
+yarn graphql-codegen
+
+git ls-files | xargs md5sum > after.txt
+
+
+diff before.txt after.txt