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node_modules/graphql/validation/rules/UniqueArgumentNames.mjs

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+import { GraphQLError } from '../../error/GraphQLError';
+export function duplicateArgMessage(argName) {
+  return "There can be only one argument named \"".concat(argName, "\".");
+}
+/**
+ * Unique argument names
+ *
+ * A GraphQL field or directive is only valid if all supplied arguments are
+ * uniquely named.
+ */
+
+export function UniqueArgumentNames(context) {
+  var knownArgNames = Object.create(null);
+  return {
+    Field: function Field() {
+      knownArgNames = Object.create(null);
+    },
+    Directive: function Directive() {
+      knownArgNames = Object.create(null);
+    },
+    Argument: function Argument(node) {
+      var argName = node.name.value;
+
+      if (knownArgNames[argName]) {
+        context.reportError(new GraphQLError(duplicateArgMessage(argName), [knownArgNames[argName], node.name]));
+      } else {
+        knownArgNames[argName] = node.name;
+      }
+
+      return false;
+    }
+  };
+}