import Literal from '../literal';
import Statement from '../statement';
import NamedNode from '../named-node';
import BlankNode from '../blank-node';
import Variable from '../variable';
import DefaultGraph from '../default-graph';
import { BlankNode as TFBlankNode, RdfJsDataFactory, Literal as TFLiteral, NamedNode as TFNamedNode, Quad, Term, Variable as TFVariable } from '../tf-types';
export type Comparable = Term | TFNamedNode | TFBlankNode | TFLiteral | Quad | undefined | null;
export type DefaultFactoryTypes = NamedNode | BlankNode | Literal | Variable | Statement;
export type Indexable = number | string;
export type Namespace = (term: string) => TFNamedNode;
/** A set of features that may be supported by a Data Factory */
export type SupportTable = Record<Feature, boolean>;
export type TFIDFactoryTypes = TFNamedNode | TFBlankNode | TFLiteral | Quad | TFVariable | Term;
export declare enum Feature {
    /** Whether the factory supports termType:Collection terms */
    collections = "COLLECTIONS",
    /** Whether the factory supports termType:DefaultGraph terms */
    defaultGraphType = "DEFAULT_GRAPH_TYPE",
    /** Whether the factory supports equals on produced instances */
    equalsMethod = "EQUALS_METHOD",
    /** Whether the factory can create a unique idempotent identifier for the given term. */
    id = "ID",
    /**
     * Whether the factory will return the same instance for subsequent calls.
     * This implies `===`, which means methods like `indexOf` can be used.
     */
    identity = "IDENTITY",
    /** Whether the factory supports mapping ids back to instances (should adhere to the identity setting) */
    reversibleId = "REVERSIBLE_ID",
    /** Whether the factory supports termType:Variable terms */
    variableType = "VARIABLE_TYPE"
}
/**
 * Defines a DataFactory as used in rdflib, based on the RDF/JS: Data model specification,
 * but with additional extensions
 *
 * bnIndex is optional but useful.
 */
export interface DataFactory<FactoryTypes = DefaultFactoryTypes, IndexType = Indexable> extends RdfJsDataFactory {
    /**
     * BlankNode index
     * @private
    */
    bnIndex?: number;
    supports: SupportTable;
    namedNode(value: string): NamedNode;
    blankNode(value?: string): BlankNode;
    literal(value: string, languageOrDatatype?: string | TFNamedNode): Literal;
    variable(value: string): Variable;
    defaultGraph(): DefaultGraph;
    isQuad(obj: any): obj is Statement;
    equals(a: Comparable, b: Comparable): boolean;
    toNQ(term: Term | FactoryTypes): string;
    quad(subject: Term, predicate: Term, object: Term, graph?: Term): Statement;
    quadToNQ(term: Statement | Quad): string;
    termToNQ(term: Term): string;
    /**
     * Generates a unique session-idempotent identifier for the given object.
     *
     * @example NQ serialization (reversible from value)
     * @example MD5 hash of termType + value (irreversible from value, map needed)
     *
     * @return {Indexable} A unique value which must also be a valid JS object key type.
     */
    id(obj: Term | FactoryTypes): IndexType;
}