import type * as RDF from '@rdfjs/types';
/**
 * A singleton term instance that represents the default graph.
 * It's only allowed to assign a DefaultGraph to the .graph property of a Quad.
 */
export declare class DefaultGraph implements RDF.DefaultGraph {
    static INSTANCE: DefaultGraph;
    readonly termType = "DefaultGraph";
    readonly value = "";
    private constructor();
    equals(other?: RDF.Term | null): boolean;
}