import { type StatusCode } from "node-opcua-status-code";
import { type ContentFilter } from "node-opcua-types";
import type { FilterContext } from "./filter_context.js";
/**
 * Validate the structure of a ContentFilter, returning a precise StatusCode (Good when valid).
 *
 * The following OPC UA Part 4 - 7.7 rules are enforced over the elements that are reachable from the
 * starting element (index 0); elements that cannot be traced back to the starting element are
 * ignored (7.7.1):
 *  - each operator carries the number of operands defined by Table 118 / Table 119, otherwise
 *    `BadFilterOperandCountMismatch` ("Extra operands for any operator shall result in an error");
 *  - each ElementOperand references an existing element (in-bounds), otherwise
 *    `BadFilterElementInvalid`;
 *  - the reference graph is acyclic, otherwise `BadFilterElementInvalid` ("The evaluation shall not
 *    introduce loops").
 *
 * The traversal is iterative so that validating a deeply-nested filter cannot itself exhaust the
 * stack.
 */
export declare function validateContentFilter(filter: ContentFilter): StatusCode;
export declare function checkFilter(filterContext: FilterContext, contentFilter: ContentFilter): boolean;
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