import type { IActorArgs, IActorTest, IAction, Mediate } from '@comunica/core';
import { Actor } from '@comunica/core';
import type { IQueryOperationResult, Bindings, IActionContext, FunctionArgumentsCache } from '@comunica/types';
import type { Algebra } from '@comunica/utils-algebra';
import type * as RDF from '@rdfjs/types';
/**
 * A comunica actor for query-operation events.
 *
 * Actor types:
 * * Input:  IActionQueryOperation:      A SPARQL Algebra operation.
 * * Test:   <none>
 * * Output: IActorQueryOperationOutput: A bindings stream.
 *
 * @see IActionQueryOperation
 * @see IQueryOperationResult
 */
export declare abstract class ActorQueryOperation<TS = undefined> extends Actor<IActionQueryOperation, IActorTest, IQueryOperationResult, TS> {
    /**
     * @param args -
     *   \ @defaultNested {<default_bus> a <cbqo:components/BusQueryOperation.jsonld#BusQueryOperation>} bus
     *   \ @defaultNested {Query operation processing failed: none of the configured actors were able to handle the operation type ${action.operation.type}} busFailMessage
     */
    protected constructor(args: IActorQueryOperationArgs<TS>);
}
export interface IActionQueryOperation extends IAction {
    /**
     * The query operation to handle.
     */
    operation: Algebra.Operation;
}
export type IActorQueryOperationArgs<TS = undefined> = IActorArgs<IActionQueryOperation, IActorTest, IQueryOperationResult, TS>;
export type MediatorQueryOperation = Mediate<IActionQueryOperation, IQueryOperationResult>;
export interface IBaseExpressionContext {
    now?: Date;
    baseIRI?: string;
    extensionFunctionCreator?: (functionNamedNode: RDF.NamedNode) => ((args: RDF.Term[]) => Promise<RDF.Term>) | undefined;
    functionArgumentsCache?: FunctionArgumentsCache;
    actionContext: IActionContext;
}
export interface ISyncExpressionContext extends IBaseExpressionContext {
    bnode: (input?: string | undefined) => RDF.BlankNode;
}
export interface IAsyncExpressionContext extends IBaseExpressionContext {
    bnode: (input?: string | undefined) => Promise<RDF.BlankNode>;
    exists?: (expr: Algebra.ExistenceExpression, bindings: Bindings) => Promise<boolean>;
}
export type FragmentSelectorShapeTestFlags = {
    joinBindings?: boolean;
    filterBindings?: boolean;
};