import { NodeDefinition, NodeLike, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType } from '../../types/graph';
/**
 * An instance of the [[substring]] node.
 * See the [[substring]] documentation to find out more.
 */
export interface SubstringNode extends StatelessGraphNode<'substring', SubstringNodeProperties> {
}
/**
 * A definition of the [[substring]] node.
 * See the [[substring]] documentation to find out more.
 */
export interface SubstringNodeDefinition extends StatelessNodeDefinition<'substring', SubstringNodeProperties> {
}
export interface SubstringNodeProperties {
    endIndex: NodeDefinition | undefined;
    startIndex: NodeDefinition;
    subject: NodeDefinition;
}
/**
 * The implementation of the [[substring]] node.
 * See the [[substring]] documentation to learn more.
 */
export declare const SubstringNodeType: StatelessNodeType<'substring', SubstringNodeProperties>;
/**
 * Creates a new instance of a [[substring]] node, which is used when extracting a part of a given string. The node expects the
 * subject to be a [[value]] containing a string value. It also requires a startIndex,
 * which must be a [[value]] containing a numeric value. End index is optional and should also
 * be a [[value]] containing a numeric value. It works in a similar way to the
 * `String.substring` from JS.
 *
 *
 * @example **Extract a substring**
 * ```js
 * import muster, { substring } from '@dws/muster';
 *
 * const app = muster({});
 *
 * await app.resolve(substring(
 *   'Hello world',
 *   1,
 * ));
 * // === 'ello world'
 *
 * await app.resolve(substring(
 *   'Hello world',
 *   0,
 *   5,
 * ));
 * // === 'Hello'
 * ```
 */
export declare function substring(subject: NodeLike, startIndex: NodeLike, endIndex?: NodeLike): SubstringNodeDefinition;
export declare function isSubstringNodeDefinition(value: NodeDefinition): value is SubstringNodeDefinition;