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[];
    /** --------------------------------------------------- {@link UndoManager} */
    push<U, R>(undo: UndoItem<U, R>): void;
    undo(): void;
    redo(): void;
    /** -------------------------------------------------- {@link UiLifeCycles} */
    start(): () => void;
}
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