export declare const defaultRateLimitOptions: RateLimitOptions;
/**
 * 	@type RateLimitOptions
 */
export type RateLimitOptions = {
    /**
     * 	How long we should remember the requests.
     *	Defaults to 60000 ms (= 1 minute).
     */
    windowMs: number;
    /**
     * 	The maximum number of connections to allow during the window before rate limiting the client.
     * 	Defaults to 100.
     */
    limit: number;
};
/**
 * 	@type RateLimitItem
 */
export type RateLimitItem = {
    /**
     * 	timestamp
     */
    t: number;
    /**
     * 	count
     */
    c: number;
};
/**
 * 	@class RateLimitService
 */
export declare class RateLimitService {
    private requestCounts;
    /**
     * 	How long we should remember the requests.
     *	Defaults to 60000 ms (= 1 minute).
     */
    protected windowMs: number;
    /**
     * 	The maximum number of connections to allow during the window before rate limiting the client.
     * 	Defaults to 100.
     */
    protected limit: number;
    /**
     * 	purge interval
     *	@protected
     */
    protected purgeInterval: any;
    constructor(options?: RateLimitOptions);
    destroy(): void;
    isAllowed(clientIp: string): boolean;
    private startPurgeInterval;
    private clearPurgeInterval;
}
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