import { CommandComponentNode } from './types/CommandComponent';
import { CommandTree, CommandTreeNode, CommandTreeNodes } from './types/CommandTree';
/**
 * @param lastIndex The index counted from the last, starting from `1`.
 */
export declare function getArgOrDefault<T>(args: CommandComponentNode<T>[], lastIndex: number, fallback: T): T;
/**
 * @param lastIndex The index counted from the last, starting from `1`.
 */
export declare function getArgData<T>(args: CommandComponentNode<T>[], lastIndex: number): CommandComponentNode<T> | undefined;
/**
 * Get the `children` of specific `CommandTreeNode`.
 */
export declare function getChildren(tree: CommandTree, node: CommandTreeNode<any>): CommandTreeNodes | undefined;
/**
 * This is a pure function.
 * @param currentNode Node which contains `template`.
 * @param singleTemplate Node whose path is the `template` defined in `currentNode`.
 */
export declare function fillSingleTemplate(currentNode: CommandTreeNode<any>, singleTemplate: CommandTreeNode<any>): CommandTreeNode<any>;
/**
 * This is a pure function.
 * @param currentNode Node which contains `template`.
 * @param childrenTemplate NodeChildren whose path is the `template` defined in `currentNode`.
 */
export declare function fillChildrenTemplate(currentNode: CommandTreeNode<any>, childrenTemplate: CommandTreeNodes): CommandTreeNodes;