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node_modules/graphql/validation/rules/UniqueDirectiveNames.mjs

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+import { GraphQLError } from '../../error/GraphQLError';
+export function duplicateDirectiveNameMessage(directiveName) {
+  return "There can be only one directive named \"".concat(directiveName, "\".");
+}
+export function existedDirectiveNameMessage(directiveName) {
+  return "Directive \"".concat(directiveName, "\" already exists in the schema. It cannot be redefined.");
+}
+/**
+ * Unique directive names
+ *
+ * A GraphQL document is only valid if all defined directives have unique names.
+ */
+
+export function UniqueDirectiveNames(context) {
+  var knownDirectiveNames = Object.create(null);
+  var schema = context.getSchema();
+  return {
+    DirectiveDefinition: function DirectiveDefinition(node) {
+      var directiveName = node.name.value;
+
+      if (schema && schema.getDirective(directiveName)) {
+        context.reportError(new GraphQLError(existedDirectiveNameMessage(directiveName), node.name));
+        return;
+      }
+
+      if (knownDirectiveNames[directiveName]) {
+        context.reportError(new GraphQLError(duplicateDirectiveNameMessage(directiveName), [knownDirectiveNames[directiveName], node.name]));
+      } else {
+        knownDirectiveNames[directiveName] = node.name;
+      }
+
+      return false;
+    }
+  };
+}