import { NodeDefinition, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType, StaticGraphNode, StaticNodeDefinition, StaticNodeType } from '../../../types/graph';
/**
 * An instance of the [[length]] node used as part of a [[ref]] node.
 * See the [[length]] documentation to find out more.
 */
export interface LengthNode extends StaticGraphNode<'length'> {
}
/**
 * A definition of the [[length]] node used as part of a [[ref]] node.
 * See the [[length]] documentation to find out more.
 */
export interface LengthNodeDefinition extends StaticNodeDefinition<'length'> {
}
/**
 * An implementation of the [[length]] node used as part of a [[ref]] node.
 * See the [[length]] documentation to find out more.
 */
export declare const LengthNodeType: StaticNodeType<'length'>;
/**
 * An instance of the [[length]] node used to compute a length of a target node.
 * See the [[length]] documentation to find out more.
 */
export interface GetLengthNode extends StatelessGraphNode<'get-length', GetLengthNodeProperties> {
}
/**
 * A definition of the [[length]] node used to compute a length of a target node.
 * See the [[length]] documentation to find out more.
 */
export interface GetLengthNodeDefinition extends StatelessNodeDefinition<'get-length', GetLengthNodeProperties> {
}
export interface GetLengthNodeProperties {
    target: NodeDefinition;
}
/**
 * An implementation of the [[length]] node used to compute a length of a target node.
 * See the [[length]] documentation to find out more.
 */
export declare const GetLengthNodeType: StatelessNodeType<'get-length', GetLengthNodeProperties>;
/**
 * Creates a new instance of the [[length]] node. This node can be used as part of a [[ref]] node to get a length of a
 * collection, or as a standalone node which computes a length of a target collection
 *
 * @example **Get a length of a collection as part of a ref**
 * ```js
 * import muster, { length, ref } from '@dws/muster';
 *
 * const app = muster({
 *   numbers: [1, 2, 3],
 * });
 *
 * await app.resolve(ref('numbers', length())); // === 3
 * ```
 * This example shows how to use [[length]] node as part of a [[ref]] to get a length of a collection.
 *
 *
 * @example **Get a length of a target collection**
 * ```js
 * import muster, { length, ref } from '@dws/muster';
 *
 * const app = muster({
 *   numbers: [1, 2, 3],
 * });
 *
 * await app.resolve(length(ref('numbers'))); // === 3
 * ```
 * This example shows how to get a length of a target collection by specifying a target of the `length()` node.
 */
export declare function length(): LengthNodeDefinition;
export declare function length(target: NodeDefinition): GetLengthNodeDefinition;
export declare function isLengthNodeDefinition(value: NodeDefinition): value is LengthNodeDefinition;
export declare function isGetLengthNodeDefinition(value: NodeDefinition): value is GetLengthNodeDefinition;