import * as rdfjs from "@rdfjs/types";
/**
 * An RDF/JS compliant NamedNode implementation.
 */
export declare class NamedNode implements rdfjs.NamedNode {
    readonly termType: "NamedNode";
    readonly value: string;
    constructor(value: string);
    equals(other: rdfjs.Term | null | undefined): boolean;
}
/**
 * An RDF/JS compliant BlankNode implementation.
 */
export declare class BlankNode implements rdfjs.BlankNode {
    readonly termType: "BlankNode";
    readonly value: string;
    constructor(value: string);
    equals(other: rdfjs.Term | null | undefined): boolean;
}
/**
 * An RDF/JS compliant Literal implementation.
 */
export declare class Literal implements rdfjs.Literal {
    readonly termType: "Literal";
    readonly value: string;
    readonly language: string;
    readonly datatype: rdfjs.NamedNode;
    constructor(value: string, languageOrDatatype?: string | rdfjs.NamedNode);
    equals(other: rdfjs.Term | null | undefined): boolean;
}
/**
 * An RDF/JS compliant Variable implementation.
 */
export declare class Variable implements rdfjs.Variable {
    readonly termType: "Variable";
    readonly value: string;
    constructor(value: string);
    equals(other: rdfjs.Term | null | undefined): boolean;
}
/**
 * An RDF/JS compliant DefaultGraph implementation (singleton).
 */
export declare class DefaultGraph implements rdfjs.DefaultGraph {
    readonly termType: "DefaultGraph";
    readonly value = "";
    equals(other: rdfjs.Term | null | undefined): boolean;
}
/**
 * An RDF/JS compliant Quad implementation.
 */
export declare class Quad implements rdfjs.Quad {
    readonly termType: "Quad";
    readonly value = "";
    readonly subject: rdfjs.Quad_Subject;
    readonly predicate: rdfjs.Quad_Predicate;
    readonly object: rdfjs.Quad_Object;
    readonly graph: rdfjs.Quad_Graph;
    constructor(subject: rdfjs.Quad_Subject, predicate: rdfjs.Quad_Predicate, object: rdfjs.Quad_Object, graph?: rdfjs.Quad_Graph);
    equals(other: rdfjs.Term | null | undefined): boolean;
}
/**
 * An RDF/JS compliant DataFactory implementation.
 *
 * This factory provides methods to create RDF terms (named nodes, blank nodes, literals, variables)
 * and quads according to the RDF/JS specification.
 *
 * @see https://rdf.js.org/data-model-spec/
 */
export declare class DataFactory implements rdfjs.DataFactory<rdfjs.Quad, rdfjs.Quad> {
    blankNodeCounter: number;
    /**
     * Creates a new named node with the given IRI.
     * @param value The IRI of the named node.
     * @returns A new NamedNode instance.
     */
    namedNode<Iri extends string = string>(value: Iri): rdfjs.NamedNode<Iri>;
    /**
     * Creates a new blank node with the given identifier.
     * If no identifier is provided, a unique one will be generated.
     * @param value Optional blank node identifier.
     * @returns A new BlankNode instance.
     */
    blankNode(value?: string): rdfjs.BlankNode;
    /**
     * Creates a new literal with the given value and optional language tag or datatype.
     * @param value The lexical value of the literal.
     * @param languageOrDatatype Either a language tag (string) or a datatype (NamedNode).
     * @returns A new Literal instance.
     */
    literal(value: string, languageOrDatatype?: string | rdfjs.NamedNode): rdfjs.Literal;
    /**
     * Creates a new variable with the given name.
     * @param value The name of the variable (without the leading '?').
     * @returns A new Variable instance.
     */
    variable(value: string): rdfjs.Variable;
    /**
     * Returns the singleton default graph instance.
     * @returns The default graph instance.
     */
    defaultGraph(): rdfjs.DefaultGraph;
    /**
     * Creates a new quad with the given subject, predicate, object, and optional graph.
     * @param subject The subject of the quad.
     * @param predicate The predicate of the quad.
     * @param object The object of the quad.
     * @param graph The graph of the quad (defaults to the default graph).
     * @returns A new Quad instance.
     */
    quad(subject: rdfjs.Quad_Subject, predicate: rdfjs.Quad_Predicate, object: rdfjs.Quad_Object, graph?: rdfjs.Quad_Graph): rdfjs.Quad;
    /**
     * Creates a copy of an existing term.
     * @param original The term to copy.
     * @returns A new term instance with the same value.
     */
    fromTerm<T extends rdfjs.Term>(original: T): T;
    /**
     * Creates a copy of an existing quad.
     * @param original The quad to copy.
     * @returns A new quad instance with the same values.
     */
    fromQuad(original: rdfjs.Quad): rdfjs.Quad;
    /**
     * Resets the blank node counter. Useful for testing.
     */
    resetBlankNodeCounter(): void;
}
/**
 * A default DataFactory instance for convenient use.
 */
export declare const dataFactory: DataFactory;