import type { QuotaType, QuotaService } from '@pipeline-builder/api-core';
import type { Request, Response, NextFunction } from 'express';
/**
 * Create middleware that checks a specific quota type before proceeding.
 *
 * On quota exceeded, returns a 429 response with quota details.
 * On quota service failure, fails open (allows the request).
 *
 * @param quotaService - Quota service client
 * @param quotaType - Which quota to check (e.g. 'apiCalls', 'pipelines', 'plugins')
 * @returns Express middleware
 */
export declare function checkQuota(quotaService: QuotaService, quotaType: QuotaType): (req: Request, res: Response, next: NextFunction) => Promise<void>;