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node_modules/graphql/validation/rules/KnownFragmentNamesRule.mjs

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+import { GraphQLError } from "../../error/GraphQLError.mjs";
+
+/**
+ * Known fragment names
+ *
+ * A GraphQL document is only valid if all `...Fragment` fragment spreads refer
+ * to fragments defined in the same document.
+ */
+export function KnownFragmentNamesRule(context) {
+  return {
+    FragmentSpread: function FragmentSpread(node) {
+      var fragmentName = node.name.value;
+      var fragment = context.getFragment(fragmentName);
+
+      if (!fragment) {
+        context.reportError(new GraphQLError("Unknown fragment \"".concat(fragmentName, "\"."), node.name));
+      }
+    }
+  };
+}