import { ExceptionFilter, ArgumentsHost } from '@nestjs/common';
import { HttpAdapterHost } from '@nestjs/core';
import { RateLimitError } from '../../../shared/errors';
/**
 * Exception filter for rate-limit errors.
 *
 * - `RateLimitExceededError` -> `429 Too Many Requests` (with rate-limit headers).
 * - `RateLimitScriptError` (raised on store failure under `errorPolicy:
 *   'fail-closed'`) -> `503 Service Unavailable`. Without this, the store error
 *   is NOT a subclass of `RateLimitExceededError` and would surface as an
 *   uncaught `500` on every request while Redis is unavailable.
 *
 * Catches the base `RateLimitError` so both cases are handled; any other
 * subclass falls back to 503 (a rate-limit subsystem failure, not the caller's
 * fault).
 */
export declare class RateLimitExceptionFilter implements ExceptionFilter {
    private readonly adapterHost;
    private readonly logger;
    constructor(adapterHost: HttpAdapterHost);
    catch(exception: RateLimitError, host: ArgumentsHost): void;
}
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