import { NodeDefinition, NodeLike, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType } from '../../types/graph';
/**
 * An instance of the [[or]] node.
 * See the [[or]] documentation to find out more.
 */
export interface OrNode extends StatelessGraphNode<'or', OrNodeProperties> {
}
/**
 * A definition of the [[or]] node.
 * See the [[or]] documentation to find out more.
 */
export interface OrNodeDefinition extends StatelessNodeDefinition<'or', OrNodeProperties> {
}
export interface OrNodeProperties {
    operands: Array<NodeDefinition>;
}
/**
 * The implementation of the [[or]] node.
 * See the [[or]] documentation to learn more.
 */
export declare const OrNodeType: StatelessNodeType<'or', OrNodeProperties>;
/**
 * Creates a new instance of a [[or]] node, which introduces an `or` expression. It checks if at least one of its
 * operands resolves to truthy. The conversion to boolean is done with the `Boolean` JS
 * function.  It requires every operand to resolve to a [[value]]. It throws an error if an
 * operand resolves to any other node type.
 *
 * @example **Different variants of `or` operands**
 * ```js
 * import muster, { computed, or, value } from '@dws/muster';
 *
 * const app = muster({});
 * await app.resolve(or(true)) // === true
 * await app.resolve(or(false)) // === false
 * await app.resolve(or(value(true))) // === true - it is equivalent to or(true)
 * await app.resolve(or('hello world')) // === true
 * await app.resolve(or(true, false)) // === true
 * await app.resolve(or(false, false)) // === false
 * await app.resolve(or(computed([], () => false))) // === false
 * await app.resolve(or(computed([], () => true))) // === true
 * await app.resolve(or(computed([], () => true), true)) // === true
 * await app.resolve(or(computed([], () => true), false)) // === true
 * await app.resolve(or(computed([], () => false), false)) // === false
 * ```
 */
export declare function or(...operands: Array<NodeDefinition | NodeLike>): OrNodeDefinition;
export declare function isOrNodeDefinition(value: NodeDefinition): value is OrNodeDefinition;