import { NodeDefinition, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType } from '../../types/graph';
/**
 * An instance of the [[nil]] node.
 * See the [[nil]] documentation to find out more.
 */
export interface NilNode extends StatelessGraphNode<'nil'> {
}
/**
 * A definition of the [[nil]] node.
 * See the [[nil]] documentation to find out more.
 */
export interface NilNodeDefinition extends StatelessNodeDefinition<'nil'> {
}
/**
 * The implementation of the [[nil]].
 * See the [[nil]] documentation to learn more.
 */
export declare const NilNodeType: StatelessNodeType<'nil'>;
/**
 * Creates a new instance of a [[nil]] node, which is a type of a [[NodeDefinition]] used when returning a `null`
 * to subscribers. For simplicity, the [[nil]] resolves to a `value(null)`.
 */
export declare function nil(): NilNodeDefinition;
export declare function isNilNodeDefinition(value: NodeDefinition): value is NilNodeDefinition;