import { Context } from 'koishi';
import { Config } from '../config';
export interface WhitelistTable {
    id: number;
    groupId: string;
    userId: string;
    createdAt: Date;
}
export declare class WhitelistService {
    private ctx;
    private config;
    private logger;
    private cache;
    constructor(ctx: Context, config: Config);
    init(): Promise<void>;
    add(groupId: string, userId: string): Promise<boolean>;
    remove(groupId: string, userId: string): Promise<boolean>;
    private syncToConfig;
    getWhitelist(groupId: string): string[];
    isWhitelisted(groupId: string, userId: string): boolean;
}