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node_modules/graphql/validation/rules/UniqueFragmentNames.mjs

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