/*!
 * Copyright (c) Microsoft Corporation and contributors. All rights reserved.
 * Licensed under the MIT License.
 */
import { IThrottler, ILogger } from "@fluidframework/server-services-core";
import { RequestHandler, Request } from "express";
/**
 * @internal
 */
export interface IThrottleMiddlewareOptions {
    /**
     * Relative weight of request amongst other requests with same suffix.
     */
    weight: number;
    /**
     * Distinguishes throttle id amongst other tracked ids with same suffix.
     * For example, this could be a tenantId, clientId, or endpoint name.
     *
     * Can be a function that takes in the `express.Request` and returns the prefix as a string,
     * which is useful for getting the id prefix from route params, such as `tenantId`.
     */
    throttleIdPrefix?: string | ((req: Request) => string);
    /**
     * Distinguishes throttle id amongst other tracked ids with same prefix.
     * For example, this could be "HistorianRest", "AlfredRest", "OpenSocketConn", or "SubmitOp".
     */
    throttleIdSuffix?: string;
}
/**
 * Express middleware for API throttling.
 * @internal
 */
export declare function throttle(throttler?: IThrottler, logger?: ILogger, options?: Partial<IThrottleMiddlewareOptions>, isHttpUsageCountingEnabled?: boolean): RequestHandler;
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