import { OnInit } from '@angular/core';
import { QuestionComponent } from '../question.component';
import { NgxSpinnerService } from 'ngx-spinner';
import { ScrollService } from '../scroll.service';
import { NgbModal } from '@ng-bootstrap/ng-bootstrap';
export declare class DocumentViewerQuestionComponent extends QuestionComponent implements OnInit {
    private spinnerService;
    private scrollService;
    private modalService;
    input: any;
    constructor(spinnerService: NgxSpinnerService, scrollService: ScrollService, modalService: NgbModal);
    ngOnInit(): void;
    readonly isInvalid: boolean;
    readonly value: any;
    readonly show: boolean;
    showDocument(): void;
}