/**
 * Quota Middleware
 *
 * Middleware for enforcing tenant quotas.
 */
import type { TenantQuotas } from '../types/index.js';
/**
 * Quota check function type
 */
export type QuotaCheck = (tenantId: string, quotaKey: string) => Promise<{
    current: number;
    limit: number;
}>;
/**
 * Quota middleware options
 */
export interface QuotaMiddlewareOptions {
    /** Function to check current usage */
    checkUsage: QuotaCheck;
    /** Quota key to check */
    quotaKey: keyof TenantQuotas;
    /** Called when quota exceeded */
    onQuotaExceeded?: (tenantId: string, current: number, limit: number) => void;
}
/**
 * Create quota enforcement middleware
 */
export declare function createQuotaMiddleware(options: QuotaMiddlewareOptions): <T>(next: () => Promise<T>) => Promise<T>;
/**
 * Quota exceeded error
 */
export declare class QuotaExceededError extends Error {
    tenantId: string;
    quotaKey: string;
    current: number;
    limit: number;
    constructor(tenantId: string, quotaKey: string, current: number, limit: number);
}
/**
 * Check multiple quotas at once
 */
export declare function checkQuotas(tenantId: string, quotas: TenantQuotas, checkUsage: QuotaCheck): Promise<{
    key: string;
    current: number;
    limit: number;
    exceeded: boolean;
}[]>;
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