import type { ASTVisitor } from '../../language/visitor';
import type { ValidationContext } from '../ValidationContext';
/**
* No unused variables
*
* A GraphQL operation is only valid if all variables defined by an operation
* are used, either directly or within a spread fragment.
* See https://spec.graphql.org/draft/#sec-All-Variables-Used
*/
export declare function NoUnusedVariablesRule(
context: ValidationContext,
): ASTVisitor;