import { EventBase } from 'survey-core';
import { SurveyPDF } from '../survey';
import { DocController } from '../doc_controller';
import { IPdfBrick } from '../pdf_render/pdf_brick';
export declare class EventAsync<Sender, Options> extends EventBase<Sender, Options> {
    unshift(func: (sender: Sender, options: Options) => any): void;
    fire(sender: Sender, options: Options): Promise<void>;
}
export declare class EventHandler {
    static process_header_events(survey: SurveyPDF, controller: DocController, packs: IPdfBrick[][]): Promise<void>;
}