import type { UndoManager, UndoItem } from '../../../types';
import type { UiLifeCycles } from '../../types';
/**
 * A Memory-based undo manager.
 */
export declare class MemoryUndo implements UndoManager, UiLifeCycles {
    /** Undo stack. */
    uStack: UndoItem[];
    /** Redo stack. */
    rStack: UndoItem[];
    push<U, R>(undo: UndoItem<U, R>): void;
    undo(): void;
    redo(): void;
    /** -------------------------------------------------- {@link UiLifeCycles} */
    start(): () => void;
}