import { Sheet, type SheetId } from './sheet';
import type { Topic, TopicId } from './topic';
export declare class Workbook {
    private _sheets;
    constructor(sheets?: Sheet[]);
    get sheets(): ReadonlyArray<Sheet>;
    query(topicId: TopicId): Topic | null;
    createRoot(title: string): Topic;
    addSheet(title: string): Sheet;
    getSheet(sheetId: SheetId): Sheet | null;
}