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node_modules/graphql/validation/rules/UniqueVariableNames.d.ts

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+import { ASTVisitor } from '../../language/visitor';
+import { ASTValidationContext } from '../ValidationContext';
+
+export function duplicateVariableMessage(variableName: string): string;
+
+/**
+ * Unique variable names
+ *
+ * A GraphQL operation is only valid if all its variables are uniquely named.
+ */
+export function UniqueVariableNames(context: ASTValidationContext): ASTVisitor;