import { ExecutionContext } from "@nestjs/common";
import { ThrottlerGuard, ThrottlerRequest } from "@nestjs/throttler";
import { FastifyRequest } from "fastify";
/**
 * Custom ThrottlerGuard that adds rate limit headers to responses.
 *
 * Headers added:
 * - X-RateLimit-Limit: Maximum number of requests allowed in the time window
 * - X-RateLimit-Remaining: Number of requests remaining in the current window
 * - X-RateLimit-Reset: Unix timestamp when the rate limit window resets
 *
 * Registered as a global APP_GUARD by the bootstrap app module factory when
 * `rateLimit.enabled` is true. Apps do not register it themselves.
 */
export declare class CustomThrottlerGuard extends ThrottlerGuard {
    protected getTracker(req: FastifyRequest): Promise<string>;
    /**
     * Skip throttling for non-HTTP execution contexts.
     *
     * This guard is registered globally (APP_GUARD), so NestJS also runs it on
     * non-HTTP contexts such as necord Discord slash commands (context type
     * "necord"). Those contexts have no HTTP response object, so calling
     * `switchToHttp().getResponse().header(...)` in `handleRequest` throws
     * `TypeError: response.header is not a function` and, inside a Discord event
     * handler, crashes the worker with an unhandled 'error'. Rate-limit headers
     * only make sense for HTTP, so we skip everything else.
     */
    protected shouldSkip(context: ExecutionContext): Promise<boolean>;
    protected handleRequest(requestProps: ThrottlerRequest): Promise<boolean>;
}
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