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node_modules/graphql/validation/rules/UniqueInputFieldNames.mjs

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+import { GraphQLError } from '../../error/GraphQLError';
+export function duplicateInputFieldMessage(fieldName) {
+  return "There can be only one input field named \"".concat(fieldName, "\".");
+}
+/**
+ * Unique input field names
+ *
+ * A GraphQL input object value is only valid if all supplied fields are
+ * uniquely named.
+ */
+
+export function UniqueInputFieldNames(context) {
+  var knownNameStack = [];
+  var knownNames = Object.create(null);
+  return {
+    ObjectValue: {
+      enter: function enter() {
+        knownNameStack.push(knownNames);
+        knownNames = Object.create(null);
+      },
+      leave: function leave() {
+        knownNames = knownNameStack.pop();
+      }
+    },
+    ObjectField: function ObjectField(node) {
+      var fieldName = node.name.value;
+
+      if (knownNames[fieldName]) {
+        context.reportError(new GraphQLError(duplicateInputFieldMessage(fieldName), [knownNames[fieldName], node.name]));
+      } else {
+        knownNames[fieldName] = node.name;
+      }
+    }
+  };
+}