import type { TRPCMiddlewareFunction } from '@trpc/server';
import type { IOptionsConstructor, IRules } from './types';
/**
 *
 * @param ruleTree
 * @param options
 *
 * Validates rules and generates middleware from defined rule tree.
 *
 */
export declare function shield<TContext extends Record<string, any>, TMeta = unknown>(ruleTree: IRules<TContext>, options?: IOptionsConstructor<TContext>): TRPCMiddlewareFunction<TContext, TMeta, object, object, unknown>;