import type { HttpMiddleware } from "../middleware/middleware-definition";
import type { HttpContext } from "../server/http-context";
export interface RateLimitOptions {
    windowMs?: number;
    max?: number;
    trustProxy?: boolean;
    keyGenerator?: (ctx: HttpContext) => string;
    store?: RateLimitStore;
    /** Maximum number of keys retained by the built-in memory store. */
    memoryStoreMaxEntries?: number;
}
interface Counter {
    count: number;
    resetAt: number;
}
export interface RateLimitStore {
    increment(key: string, now: number, windowMs: number): Counter | Promise<Counter>;
    prune?(now: number): void | Promise<void>;
}
export declare function rateLimit(options?: RateLimitOptions): HttpMiddleware;
export declare function createMemoryRateLimitStore(maxEntries?: number): RateLimitStore;
export {};