import { Response } from "../../lambda-proxy";
import { Middleware, MiddlewareAfterOptions, MiddlewareBeforeOptions } from "../../middleware";
export interface SamplingRules {
    rules?: SamplingRules[];
    default: SamplingRule;
    /**
     * Number identifier of version. just (1)
     */
    version: number;
}
export interface SamplingRule {
    /**
     * first (n) request for every seconds will be profiled
     */
    fixed_target: number;
    /**
     * except first (n) requests, how much requests will be sampled (0 ~ 1)
     */
    rate: number;
    /**
     * Description about this rule
     */
    description?: string;
    /**
     * Service Name filter. check segment's service name
     */
    service_name?: string;
    /**
     * HTTP Method filter, check segment's http_method
     */
    http_method?: string;
    /**
     * URL Path filter, check segment's url_path
     */
    url_path?: string;
}
export declare class XRayMiddleware extends Middleware {
    private segment;
    constructor(samplingRules?: SamplingRules);
    before(options: MiddlewareBeforeOptions<undefined>): Promise<Response | void>;
    after(options: MiddlewareAfterOptions<undefined>): Promise<Response>;
}