import type { TSurvey } from "../../types/survey";
type Listener = (state: TSurvey | null, prevSurvey: TSurvey | null) => void;
export declare class SurveyStore {
    private static instance;
    private survey;
    private readonly listeners;
    static getInstance(): SurveyStore;
    getSurvey(): TSurvey | null;
    setSurvey(survey: TSurvey): void;
    resetSurvey(): void;
    subscribe(listener: Listener): () => boolean;
}
export {};
//# sourceMappingURL=store.d.ts.map