/**
 * Rate Limiting Middleware
 *
 * Sliding-window rate limiter keyed by caller phone number.
 * Prevents abuse by limiting requests per phone number within a time window.
 */
import type { Context, Next } from "hono";
import type { TalkerConfig } from "../types";
export declare const DEFAULT_MAX_REQUESTS = 30;
export declare const DEFAULT_WINDOW_MS = 60000;
/**
 * Stop the periodic cleanup timer without discarding tracked counts, so a
 * host can release the timer on shutdown (mirrors `core/context.ts`'s
 * `stopCleanup`) without resetting rate-limit state the way
 * `resetRateLimitStore` does.
 */
export declare function stopRateLimitCleanup(): void;
/**
 * Check if a phone number has exceeded the rate limit.
 * Returns true if the request should be allowed.
 */
export declare function checkRateLimit(phoneNumber: string, maxRequests: number, windowMs: number): boolean;
/**
 * Hono middleware factory for rate limiting.
 *
 * Limits requests per phone number (from body.From).
 * Returns a 429 TwiML response when the limit is exceeded.
 *
 * `talkerConfig` is what makes that response speak: the `rateLimited` phrase
 * is looked up in the caller's detected language and rendered by `sayTwiml`,
 * so it carries the configured voice and is escaped like every other spoken
 * string. It stays optional because the middleware is exported for hosts to
 * mount on their own routes; without it the phrase still resolves (built-in
 * copy, default voice), only a host's `languageDir` and `voices` overrides
 * are missed.
 */
export declare function rateLimitMiddleware(config?: {
    maxRequests?: number;
    windowMs?: number;
}, talkerConfig?: TalkerConfig): (c: Context, next: Next) => Promise<void | Response>;
/**
 * Reset rate limit store (for testing)
 */
export declare function resetRateLimitStore(): void;