import { Dataset, Literal, Quad, Quad_Object } from "@rdfjs/types";
import { PredicateType, SubjectType } from "../types";
import { LanguageKey, LanguageOrdering } from "./languageTypes";
/**
 *
 * @param dataset
 * @param subject
 * @param predicate
 * @param languageKey
 * @returns
 */
export declare function languageMatch(dataset: Dataset, subject: SubjectType, predicate: PredicateType, languageKey: LanguageKey): Dataset<LiteralObjectQuad>;
/**
 *
 * @param dataset
 * @param subject
 * @param predicate
 * @param languageKey
 */
export declare function languageDeleteMatch(dataset: Dataset, subject: SubjectType, predicate: PredicateType, languageKey: LanguageKey): void;
/**
 * Given a node, will return true if that node is a literal that could have a
 * language. This does not guarantee that it is a language literal.
 * @param node the node to test
 * @returns boolean
 */
export declare function isLanguageLiteral(node: Quad_Object): node is Literal;
export interface LiteralObjectQuad extends Quad {
    object: Literal;
}
export declare function quadsToLanguageQuadMap(quads: Dataset): Record<LanguageKey, Dataset<LiteralObjectQuad>>;
export declare function filterQuadsByLanguageOrdering(quads: Dataset, languageOrdering: LanguageOrdering): Dataset;
export declare function getLanguageKeyForWriteOperation(languageOrdering: LanguageOrdering): LanguageKey | undefined;
export declare function languageKeyToLiteralLanguage(languageKey: string | symbol): string;
export declare function literalLanguageToLanguageKey(literalLanguage: string): string;