import * as RDF from "@rdfjs/types";
/**
 * A query engine handler.
 */
export interface IQueryEngine {
    parse(queryString: string, options: {
        [key: string]: any;
    }): Promise<void>;
    query(data: RDF.Quad[], queryString: string, options: {
        [key: string]: any;
    }): Promise<IQueryResult>;
}
/**
 * Super type for all query result types.
 */
export type IQueryResult = IQueryResultBoolean | IQueryResultQuads | IQueryResultBindings;
/**
 * Holds a boolean query result.
 */
export interface IQueryResultBoolean {
    type: 'boolean';
    value: boolean;
    equals(that: IQueryResult, laxCardinality?: boolean): boolean;
    toString(): string;
}
/**
 * Holds quad-based query results.
 */
export interface IQueryResultQuads {
    type: 'quads';
    value: RDF.Quad[];
    equals(that: IQueryResult, laxCardinality?: boolean): boolean;
    toString(): string;
}
/**
 * Holds bindings-based query results.
 */
export interface IQueryResultBindings {
    type: 'bindings';
    variables: string[];
    value: {
        [variable: string]: RDF.Term;
    }[];
    checkOrder: boolean;
    equals(that: IQueryResult, laxCardinality?: boolean): boolean;
    toString(): string;
}