import { ChildKey, NodeDefinition, NodeLike, StaticGraphNode, StaticNodeDefinition, StaticNodeType } from '../../types/graph';
import { KeyNodeDefinition } from './key';
export declare type DeferNodeFallbackGenerator = (previousValue: NodeDefinition | undefined) => NodeDefinition;
/**
 * An instance of the [[defer]] node.
 * See the [[defer]] documentation to find out more.
 */
export interface DeferNode extends StaticGraphNode<'defer', DeferNodeProperties> {
}
/**
 * A definition of the [[defer]] node.
 * See the [[defer]] documentation to find out more.
 */
export interface DeferNodeDefinition extends StaticNodeDefinition<'defer', DeferNodeProperties> {
}
export interface DeferNodeProperties {
    fallbackGenerator: DeferNodeFallbackGenerator;
    target: KeyNodeDefinition;
}
/**
 * The implementation of the [[defer]].
 * See the [[defer]] documentation to learn more.
 */
export declare const DeferNodeType: StaticNodeType<'defer', DeferNodeProperties>;
/**
 * Creates a new instance of a [[defer]] node, which is a type of a [[NodeDefinition]] used inside a [[query]]
 * to indicate that a given part of the query should not block the remainder of the query from resolving.
 *
 * See the **Defer part of a query** example from the [[query]] documentation page to learn more.
 */
export declare function defer(target: KeyNodeDefinition | ChildKey): DeferNodeDefinition;
export declare function defer(fallback: DeferNodeFallbackGenerator | NodeDefinition | NodeLike, target: KeyNodeDefinition | ChildKey): DeferNodeDefinition;
export declare function isDeferNodeDefinition(value: NodeDefinition): value is DeferNodeDefinition;