/**
 * Copyright (c) 2014 Baidu.com, Inc. All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * @file src/bce_base_client.ts
 * @author leeight
 */
import { EventEmitter } from 'events';
import { Writable } from 'stream';
import HttpClient, { RequestBody } from './http_client';
import type { BceConfig, BceResponse, Credentials, HttpMethod, HttpHeaders } from './types/common';
/** 请求参数接口 */
export interface RequestArgs {
    /** 请求体 */
    body?: RequestBody;
    /** 请求头 */
    headers?: HttpHeaders;
    /** 查询参数 */
    params?: Record<string, any>;
    /** 请求级别的配置 */
    config?: Partial<BceConfig>;
    /** 输出流 */
    outputStream?: Writable;
}
/**
 * BCE 基础客户端类
 * 所有 BCE 服务客户端的基类，提供通用的请求处理逻辑
 *
 * @example
 * ```typescript
 * class CustomClient extends BceBaseClient {
 *   constructor(config: BceConfig) {
 *     super(config, 'custom-service', true);
 *   }
 *
 *   async customMethod(): Promise<BceResponse> {
 *     return this.sendRequest('GET', '/custom-path');
 *   }
 * }
 * ```
 */
export declare class BceBaseClient extends EventEmitter {
    /** 客户端配置 */
    config: BceConfig;
    /** 服务 ID */
    serviceId: string;
    /** 是否支持地域 */
    regionSupported: boolean;
    /** 时间偏移量（用于时间同步） */
    timeOffset?: number;
    /** HTTP 代理客户端 */
    private _httpAgent;
    /**
     * 构造函数
     * @param clientConfig 客户端配置
     * @param serviceId 服务 ID
     * @param regionSupported 是否支持地域
     */
    constructor(clientConfig: BceConfig, serviceId: string, regionSupported?: boolean);
    /**
     * 计算服务端点
     * @returns 服务端点 URL
     */
    private _computeEndpoint;
    /**
     * 创建签名
     * @param credentials 认证凭据
     * @param httpMethod HTTP 方法
     * @param path 请求路径
     * @param params 查询参数
     * @param headers 请求头
     * @returns Promise<签名字符串>
     */
    createSignature(credentials: Credentials, httpMethod: HttpMethod, path: string, params: Record<string, any>, headers: HttpHeaders): Promise<string>;
    /**
     * 发送请求（高级接口）
     * @param httpMethod HTTP 方法
     * @param resource 资源路径
     * @param varArgs 请求参数
     * @returns Promise<BceResponse>
     */
    sendRequest(httpMethod: HttpMethod, resource: string, varArgs?: Partial<RequestArgs>): Promise<BceResponse>;
    /**
     * 发送 HTTP 请求（底层接口）
     * @param httpMethod HTTP 方法
     * @param resource 资源路径
     * @param args 请求参数
     * @param requestConfig 请求配置
     * @returns Promise<BceResponse>
     */
    sendHTTPRequest(httpMethod: HttpMethod, resource: string, args: RequestArgs, requestConfig: BceConfig): Promise<BceResponse>;
    /**
     * 获取当前 HTTP 代理
     * @returns HTTP 客户端实例
     */
    getHttpAgent(): HttpClient | null;
    /**
     * 更新配置
     * @param newConfig 新的配置
     */
    updateConfig(newConfig: Partial<BceConfig>): void;
    /**
     * 获取服务端点
     * @returns 服务端点 URL
     */
    getEndpoint(): string;
    /**
     * 获取服务 ID
     * @returns 服务 ID
     */
    getServiceId(): string;
    /**
     * 检查是否支持地域
     * @returns 是否支持地域
     */
    isRegionSupported(): boolean;
    /**
     * 销毁客户端，清理资源
     */
    destroy(): void;
}
export default BceBaseClient;
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