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node_modules/graphql/validation/rules/UniqueOperationNames.mjs

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+import { GraphQLError } from '../../error/GraphQLError';
+export function duplicateOperationNameMessage(operationName) {
+  return "There can be only one operation named \"".concat(operationName, "\".");
+}
+/**
+ * Unique operation names
+ *
+ * A GraphQL document is only valid if all defined operations have unique names.
+ */
+
+export function UniqueOperationNames(context) {
+  var knownOperationNames = Object.create(null);
+  return {
+    OperationDefinition: function OperationDefinition(node) {
+      var operationName = node.name;
+
+      if (operationName) {
+        if (knownOperationNames[operationName.value]) {
+          context.reportError(new GraphQLError(duplicateOperationNameMessage(operationName.value), [knownOperationNames[operationName.value], operationName]));
+        } else {
+          knownOperationNames[operationName.value] = operationName;
+        }
+      }
+
+      return false;
+    },
+    FragmentDefinition: function FragmentDefinition() {
+      return false;
+    }
+  };
+}