clean the lib dir before building

.github/workflows/pr-checks.yml

@@ -24,6 +24,8 @@ jobs:
           >&2 echo "Failed: Repo should be clean before testing!"
           exit 1
         fi
+        # Wipe the lib directory incase there are extra unnecessary files in there
+        rm -rf lib
         # Generate the JavaScript files
         npm run-script build
         # Check that repo is still clean