import type { Context, Middleware, Next } from '../types.js';
export declare class RateLimiter implements Middleware {
    private store;
    private maxRequests;
    private windowMs;
    private keyFn;
    constructor(options?: {
        maxRequests?: number;
        windowMs?: number;
        keyFn?: (ctx: Context) => string;
    });
    handle(ctx: Context, next: Next): Promise<void>;
}
export declare function rateLimit(maxRequests: number, windowMs?: number): RateLimiter;
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