import type * as RDF from '@rdfjs/types';
import * as Algebra from './algebra.js';
import { AlgebraFactory } from './index.js';
/**
 * Utility for canonicalizing SPARQL Algebra operations by replacing blank node
 * and variable names with deterministic generated names.
 * Useful for comparing algebra representations in tests.
 */
export declare class Canonicalizer {
    constructor();
    blankId: number;
    genValue(): string;
    /**
     * Replaces values of BlankNodes in a query with newly generated names.
     * @param res
     * @param replaceVariables
     */
    canonicalizeQuery(res: Algebra.Operation, replaceVariables: boolean): Algebra.Operation;
    replaceValue(term: RDF.Term, nameMapping: Record<string, string>, replaceVars: boolean, factory: AlgebraFactory): RDF.Term;
}