import { InitParams, ShareTargetPickerResult } from './def';
export declare class ShareTargetPicker {
    private static instance;
    private liffId;
    private allowPostMessageOrigin;
    private payloadToShareTargetPicker;
    private ott;
    private popupWindow;
    private timeoutIDForHealthCheck;
    private abortController;
    private internalError;
    private doesWaitForSubwindowResult;
    private constructor();
    static getInstance(): ShareTargetPicker;
    init(params: InitParams): Promise<ShareTargetPickerResult | void>;
    private resetAllVariables;
    private reset;
    private finalize;
    private buildPayloadToShareTargetPicker;
    private initAllowPostMessageOrigin;
    private initOtt;
    private prepareAnotherWindow;
    private openAnotherWindow;
    private initListener;
    private healthCheck;
    private onReceivedHealthcheck;
    private onCanceled;
    private getShareResult;
    static isPollingTimeOut(startTime: number, endTime: number): boolean;
    private pollingShareResult;
}