declare class UndoManager {
    maxUndoCount: number;
    stack: string[];
    idx: number;
    constructor(maxUndoCount: number);
    undo(): string;
    redo(): string;
    push(content: string): void;
    readonly size: number;
    readonly canRedo: boolean;
    readonly canUndo: boolean;
}
export { UndoManager };
declare const _default: UndoManager;
export default _default;