import type * as RDF from '@rdfjs/types';
import type { IQuadTransformer } from './IQuadTransformer';
/**
 * A quad transformer that wraps over another quad transformer and removes duplicates produced by the transformer.
 * Only quads that are produced by the quad transformer (and are unequal to the incoming quad) will be filtered away.
 */
export declare class QuadTransformerDistinct implements IQuadTransformer {
    private readonly transformer;
    private readonly passedQuads;
    constructor(transformer: IQuadTransformer);
    transform(quad: RDF.Quad, allowedComponent?: 'subject' | 'object'): RDF.Quad[];
    end(): void;
}