import { Actor } from '@comunica/core';
import type { IAction, IActorArgs, IActorOutput, IActorTest, Mediate } from '@comunica/core';
import type { Quad } from 'rdf-data-factory';
/**
 * A comunica actor for hash-quads events.
 *
 * Actor types:
 * * Input:  IActionHashQuads:      Metadata for selecting a hash function.
 * * Test:   <none>
 * * Output: IActorHashQuadsOutput: The resulting hash function.
 *
 * @see IActionHashQuads
 * @see IActorHashQuadsOutput
 */
export declare abstract class ActorHashQuads<TS = undefined> extends Actor<IActionHashQuads, IActorTest, IActorHashQuadsOutput, TS> {
    /**
     * @param args -
     *   \ @defaultNested {<default_bus> a <cc:components/Bus.jsonld#Bus>} bus
     *   \ @defaultNested {Failed to obtaining hash functions for quads} busFailMessage
     */
    constructor(args: IActorHashQuadsArgs<TS>);
}
export interface IActionHashQuads extends IAction {
}
export interface IActorHashQuadsOutput extends IActorOutput {
    /**
     * A number-based hash factory of the given object.
     * It is recommended to always return 32-bit numbers to enable SMI optimization.
     *
     * Hash functions could produce collisions for non-equal quads.
     *
     * @param {RDF.Quad} quads The quads to hash.
     * @return {string} The object's hash.
     */
    hashFunction: HashFunction;
}
export type HashFunction = (quad: Quad) => number;
export type IActorHashQuadsArgs<TS = undefined> = IActorArgs<IActionHashQuads, IActorTest, IActorHashQuadsOutput, TS>;
export type MediatorHashQuads = Mediate<IActionHashQuads, IActorHashQuadsOutput>;