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import type {  NamedNode,  BlankNode,  Literal,  Variable,  Quad,  Term,  Bindings,} from "https://esm.sh/rdf-js@4.0.2";export type { NamedNode, BlankNode, Literal, Variable, Quad, Term, Bindings };
export { fromRdf, toRdf } from "https://esm.sh/rdf-literal@1.3.0";
import * as DataFactory from "https://esm.sh/rdf-data-factory@1.1.1";export { DataFactory } from "https://esm.sh/rdf-data-factory@1.1.1";
export type Iri = string;
export type Node = Map<Iri, Term[]>;
export type Graph = Map<Iri, Node>;
export const namedNode = <Iri extends string = string>(  value: Iri): NamedNode<Iri> => new DataFactory.NamedNode(value);
export const blankNode = (value: string) => new DataFactory.BlankNode(value);
export const literal = (  value: string,  languageOrDatatype?: string | NamedNode): Literal => new DataFactory.Literal(value, languageOrDatatype);
export const quad = (  subject: Quad["subject"],  predicate: Quad["predicate"],  object: Quad["object"],  graph?: Quad["graph"]): Quad =>  new DataFactory.Quad(    subject,    predicate,    object,    graph || DataFactory.DefaultGraph.INSTANCE  ) as Quad;
export const variable = (value: string): Variable =>  new DataFactory.Variable(value);
export const quadsToGraph = (quads: Quad[]) => {  const graph: Graph = new Map();  for (const quad of quads) {    const s = quad.subject.value;    const p = quad.predicate.value;
    const predicateMap = graph.get(s) || graph.set(s, new Map()).get(s)!;    const termArray = predicateMap.get(p) || predicateMap.set(p, []).get(p)!;
    termArray.push(quad.object);  }  return graph;};