Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/KnownFragmentNamesRule.mjs

@@ -0,0 +1,26 @@
+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.
+ *
+ * See https://spec.graphql.org/draft/#sec-Fragment-spread-target-defined
+ */
+export function KnownFragmentNamesRule(context) {
+  return {
+    FragmentSpread(node) {
+      const fragmentName = node.name.value;
+      const fragment = context.getFragment(fragmentName);
+
+      if (!fragment) {
+        context.reportError(
+          new GraphQLError(`Unknown fragment "${fragmentName}".`, {
+            nodes: node.name,
+          }),
+        );
+      }
+    },
+  };
+}