import { Question } from '@lcool/api';
export declare type QuestionQuery = {
    id?: string;
    titleSlug?: string;
};
export declare type QuestionQueryFilter = (q: Question) => boolean;
export declare function getCachedQuestion(filter: QuestionQueryFilter): Promise<Question[]>;
export declare function getCachedQuestion(query: QuestionQuery): Promise<Question>;
export declare function ensureQuestionIndex(retry?: number): Promise<Question[]>;
export declare function createQuestionIndex(): Promise<void>;
export declare function checkQuestionIndex(): boolean;