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node_modules/graphql/validation/rules/UniqueVariableNames.mjs

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+import { GraphQLError } from '../../error/GraphQLError';
+export function duplicateVariableMessage(variableName) {
+  return "There can be only one variable named \"".concat(variableName, "\".");
+}
+/**
+ * Unique variable names
+ *
+ * A GraphQL operation is only valid if all its variables are uniquely named.
+ */
+
+export function UniqueVariableNames(context) {
+  var knownVariableNames = Object.create(null);
+  return {
+    OperationDefinition: function OperationDefinition() {
+      knownVariableNames = Object.create(null);
+    },
+    VariableDefinition: function VariableDefinition(node) {
+      var variableName = node.variable.name.value;
+
+      if (knownVariableNames[variableName]) {
+        context.reportError(new GraphQLError(duplicateVariableMessage(variableName), [knownVariableNames[variableName], node.variable.name]));
+      } else {
+        knownVariableNames[variableName] = node.variable.name;
+      }
+    }
+  };
+}