import { ClusterOptions, RedisOptions } from 'ioredis';
import { IRateLimiterOptions, IRateLimiterRedisOptions } from 'rate-limiter-flexible';
type RedisConfig = {
    url?: string;
    options?: RedisOptions | ClusterOptions;
} & (IRateLimiterRedisOptions | IRateLimiterOptions);
export declare class ApolloServerRateLimiter {
    private static self;
    private options;
    private withRedis;
    private redisClient;
    private isReady;
    private remainSettings;
    private readonly REDIS_URL;
    static init(options?: RedisConfig): ApolloServerRateLimiter;
    static get instance(): ApolloServerRateLimiter;
    term(): Promise<void>;
    getSchema(): Promise<{
        rateLimitDirectiveTransformer: (schema: import("graphql").GraphQLSchema) => import("graphql").GraphQLSchema;
        rateLimitDirectiveTypeDefs: import("graphql").DocumentNode;
    }>;
    private constructor();
    private finalize;
    plugin(): {
        serverWillStart(): Promise<{
            serverWillStop(): Promise<void>;
        }>;
    };
}
export {};