Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/UniqueOperationNamesRule.mjs

@@ -0,0 +1,39 @@
+import { GraphQLError } from '../../error/GraphQLError.mjs';
+
+/**
+ * Unique operation names
+ *
+ * A GraphQL document is only valid if all defined operations have unique names.
+ *
+ * See https://spec.graphql.org/draft/#sec-Operation-Name-Uniqueness
+ */
+export function UniqueOperationNamesRule(context) {
+  const knownOperationNames = Object.create(null);
+  return {
+    OperationDefinition(node) {
+      const operationName = node.name;
+
+      if (operationName) {
+        if (knownOperationNames[operationName.value]) {
+          context.reportError(
+            new GraphQLError(
+              `There can be only one operation named "${operationName.value}".`,
+              {
+                nodes: [
+                  knownOperationNames[operationName.value],
+                  operationName,
+                ],
+              },
+            ),
+          );
+        } else {
+          knownOperationNames[operationName.value] = operationName;
+        }
+      }
+
+      return false;
+    },
+
+    FragmentDefinition: () => false,
+  };
+}