import { GraphNode, NodeDefinition, StatefulGraphNode, StatefulNodeDefinition, StatefulNodeType } from '../../types/graph';
/**
 * An instance of the [[pop]] node.
 * See the [[pop]] documentation to find out more.
 */
export interface PopNode extends StatefulGraphNode<'pop', PopNodeProperties> {
}
/**
 * A definition of the [[pop]] node.
 * See the [[pop]] documentation to find out more.
 */
export interface PopNodeDefinition extends StatefulNodeDefinition<'pop', PopNodeProperties> {
}
export interface PopNodeProperties {
    id: number;
    target: NodeDefinition;
}
export interface PopNodeState {
    currentValue: GraphNode | undefined;
}
/**
 * The implementation of the [[pop]].
 * See the [[pop]] documentation for more information.
 */
export declare const PopNodeType: StatefulNodeType<'pop', PopNodeProperties, PopNodeState, {}>;
/**
 * Creates an instance of an [[pop]], which is a type of a graph node used when popping a last item from a mutable collection.
 * It works in a similar way to `Array.pop(...)` function from JavaScript.
 *
 *
 * @example **Pop a number from a mutable collection**
 * ```js
 * import muster, { arrayList, entries, query, ref, pop } from '@dws/muster';
 *
 * const app = muster({
 *   numbers: arrayList([3, 1, 2]),
 * });
 *
 * app.resolve(query(ref('numbers'), entries())).subscribe((numbers) => {
 *   console.log(numbers);
 * });
 *
 * await app.resolve(pop(ref('numbers'))); // === 2
 * await app.resolve(pop(ref('numbers'))); // === 1
 * await app.resolve(pop(ref('numbers'))); // === 3
 * await app.resolve(pop(ref('numbers'))); // === null
 * await app.resolve(pop(ref('numbers'))); // === null
 *
 * // Console output:
 * // [3, 1, 2]
 * // [3, 1]
 * // [3],
 * // []
 * ```
 * This example shows how to use the [[pop]] node to remove last item from the mutable
 * collection. The node resolves to a removed value or [[nil]] node, when there are
 * no more items to be popped.
 *
 *
 * @example **Pop a branch from a mutable collection**
 * ```js
 * import muster, { arrayList, entries, key, query, ref, pop } from '@dws/muster';
 *
 * const app = muster({
 *   people: arrayList([
 *     { firstName: 'Lizzie', lastName: 'Ramirez' },
 *     { firstName: 'Charlotte', lastName: 'Schneider' },
 *     { firstName: 'Genevieve', lastName: 'Patrick' },
 *   ]),
 * });
 *
 * app.resolve(query(ref('numbers'), entries({
 *   firstName: key('firstName'),
 * }))).subscribe((people) => {
 *   console.log(people);
 * });
 *
 * await app.resolve(pop(ref('people'))); // === { firstName: 'Genevieve', lastName: 'Patrick' }
 * await app.resolve(pop(ref('people'))); // === { firstName: 'Charlotte', lastName: 'Schneider' }
 * await app.resolve(pop(ref('people'))); // === { firstName: 'Lizzie', lastName: 'Ramirez' }
 * await app.resolve(pop(ref('people'))); // === null
 * await app.resolve(pop(ref('people'))); // === null
 *
 * // Console output:
 * // [{ firstName: 'Lizzie' }, { firstName: 'Charlotte' }, { firstName: 'Genevieve' }]
 * // [{ firstName: 'Lizzie' }, { firstName: 'Charlotte' }]
 * // [{ firstName: 'Lizzie' }]
 * // []
 * ```
 */
export declare function pop(target: NodeDefinition): PopNodeDefinition;