/**
 * Interface for all command objects
 */
export interface Command {
    /**
     * Executes the command
     */
    execute(): void;
}
/**
 * Interface for commands that can be undone
 */
export interface UndoableCommand extends Command {
    /**
     * Undoes the command, restoring the previous state
     */
    undo(): void;
}
/**
 * Manages the execution of commands and keeps track of command history
 */
export declare class CommandInvoker {
    private history;
    /**
     * Executes a command
     */
    execute(command: Command): void;
    /**
     * Undoes the most recently executed command
     * @returns true if a command was undone, false if there was no command to undo
     */
    undo(): boolean;
    /**
     * Clears the command history
     */
    clearHistory(): void;
    /**
     * Returns the number of undoable commands in history
     */
    historyLength(): number;
    /**
     * Type guard to check if a command is undoable
     */
    private isUndoable;
}