import { NodeDefinition, NodeLike, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType } from '../../types/graph';
/**
 * An instance of the [[ifElse]] node.
 * See the [[ifElse]] documentation to find out more.
 */
export interface IfElseNode extends StatelessGraphNode<'ifElse', IfElseNodeProperties> {
}
/**
 * A definition of the [[ifElse]] node.
 * See the [[ifElse]] documentation to find out more.
 */
export interface IfElseNodeDefinition extends StatelessNodeDefinition<'ifElse', IfElseNodeProperties> {
}
export interface IfElseNodeProperties {
    if: NodeDefinition;
    then: NodeDefinition;
    else: NodeDefinition;
}
/**
 * The implementation of the [[ifElse]] node.
 * See the [[ifElse]] documentation to learn more.
 */
export declare const IfElseNodeType: StatelessNodeType<'ifElse', IfElseNodeProperties>;
/**
 * Creates a new instance of an [[ifElse]] node, which allows creation of conditional expressions. You can think of it as
 * a `if ... else ...` statement in any programming language. This node by conditionally resolving
 * to `then` node when the `if` condition resolves to `true`; otherwise resolves to `else`.
 * The `if`, `then` and `else` nodes can be any graph nodes.
 *
 *
 * @example **Simple if-else**
 * ```ts
 * import muster, { ifElse, ref, set, variable } from '@dws/muster';
 *
 * const app = muster({
 *   isLoggedIn: variable(false),
 *   greeting: ifElse({
 *     if: ref('isLoggedIn'),
 *     then: 'Hello, logged-in user!',
 *     else: 'Hello, guest!',
 *   }),
 * });
 *
 * app.resolve(ref('greeting')).subscribe((res) => {
 *   console.log(res);
 * });
 *
 * console.log('Logging in');
 * await app.resolve(set('isLoggedIn', true));
 *
 * // Console output:
 * // Hello, guest!
 * // Logging in
 * // Hello, logged-in user!
 * ```
 */
export declare function ifElse(definition: {
    if: NodeDefinition | NodeLike;
    then: NodeDefinition | NodeLike;
    else: NodeDefinition | NodeLike;
}): IfElseNodeDefinition;
export declare function isIfElseNodeDefinition(value: NodeDefinition): value is IfElseNodeDefinition;