import { NodeDefinition, NodeLike, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType } from '../../types/graph';
/**
 * An instance of the [[toString]] node.
 * See the [[toString]] documentation to find out more.
 */
export interface ToStringNode extends StatelessGraphNode<'to-string', ToStringNodeProperties> {
}
/**
 * A definition of the [[toString]] node.
 * See the [[toString]] documentation to find out more.
 */
export interface ToStringNodeDefinition extends StatelessNodeDefinition<'to-string', ToStringNodeProperties> {
}
export interface ToStringNodeProperties {
    subject: NodeDefinition;
}
/**
 * The implementation of the [[toString]] node.
 * See the [[toString]] documentation to learn more.
 */
export declare const ToStringNodeType: StatelessNodeType<'to-string', ToStringNodeProperties>;
/**
 * Creates a new instance of a [[toString]] node, which is used when converting a any type value to a stringified version of the
 * value. It uses the `toString` helper from lodash to do the conversion. The node expects the
 * subject to be a [[value]] containing a string value.
 *
 *
 * @example **Convert to string**
 * ```js
 * import muster, { toString } from '@dws/muster';
 *
 * const app = muster({});
 *
 * await app.resolve(toString('Hello world'));
 * // === 'Hello world'
 *
 * await app.resolve(toString(123));
 * // === '123'
 *
 * await app.resolve(toString(true));
 * // === 'true'
 *
 * await app.resolve(toString({ hello: 'world'}));
 * // === '[object Object]'
 * ```
 */
export declare function toString(subject: NodeLike): ToStringNodeDefinition;
export declare function isToStringNodeDefinition(value: NodeDefinition): value is ToStringNodeDefinition;