Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/LoneAnonymousOperationRule.mjs

@@ -0,0 +1,34 @@
+import { GraphQLError } from '../../error/GraphQLError.mjs';
+import { Kind } from '../../language/kinds.mjs';
+
+/**
+ * Lone anonymous operation
+ *
+ * A GraphQL document is only valid if when it contains an anonymous operation
+ * (the query short-hand) that it contains only that one operation definition.
+ *
+ * See https://spec.graphql.org/draft/#sec-Lone-Anonymous-Operation
+ */
+export function LoneAnonymousOperationRule(context) {
+  let operationCount = 0;
+  return {
+    Document(node) {
+      operationCount = node.definitions.filter(
+        (definition) => definition.kind === Kind.OPERATION_DEFINITION,
+      ).length;
+    },
+
+    OperationDefinition(node) {
+      if (!node.name && operationCount > 1) {
+        context.reportError(
+          new GraphQLError(
+            'This anonymous operation must be the only defined operation.',
+            {
+              nodes: node,
+            },
+          ),
+        );
+      }
+    },
+  };
+}