/**
 * CommonLoader - 上传/下载器公共基类
 * 提供状态管理、进度计算、速度统计、事件系统等公共功能
 */
import EventEmitter from '../utils/EventEmitter';
import { SMHError } from '../utils/ErrorHandler';
import { TaskStatus, IFile, CommonLoaderOptions } from './types';
/**
 * CommonLoader 抽象基类
 * 提供上传/下载器的公共功能
 */
export declare abstract class CommonLoader<TCheckpoint = any> extends EventEmitter {
    readonly id: string;
    file: IFile;
    protected verbose: boolean;
    state: TaskStatus;
    message: string;
    progress: number;
    loaded: number;
    speed: number;
    left_time: number;
    protected startSize: number;
    protected lastEmittedProgress: number;
    protected lastProgressLoaded: number;
    start_time: number;
    end_time: number;
    used_avg_speed: number;
    used_time_len: number;
    avg_speed: number;
    protected pauseFlag: boolean;
    protected cancelFlag: boolean;
    error?: SMHError;
    protected abortController: AbortController;
    protected tid_speed?: ReturnType<typeof setInterval>;
    protected speedList: number[];
    protected speed_0_count: number;
    protected task_start_time: number;
    protected start_done_part_loaded: number;
    protected readonly PROGRESS_EMIT_STEP = 0.2;
    protected readonly MAX_SPEED_0_COUNT = 10;
    protected readonly MAX_RETRY_TIMES = 3;
    constructor(file: IFile, options?: CommonLoaderOptions);
    /**
     * 获取任务类型（子类实现）
     */
    protected abstract getTaskType(): string;
    /**
     * 日志输出
     */
    protected logInfo(...args: any[]): void;
    protected logWarn(...args: any[]): void;
    protected logError(...args: any[]): void;
    /**
     * 生成唯一任务ID
     */
    protected generateTaskId(): string;
    /**
     * 获取checkpoint信息（子类实现）
     */
    abstract getCheckpoint(): TCheckpoint;
    /**
     * 等待开始
     */
    wait(): Promise<void>;
    /**
     * 开始任务（子类实现）
     */
    abstract start(): Promise<void>;
    /**
     * 取消所有正在进行的 HTTP 请求，并重建控制器供后续使用（恢复场景）
     */
    protected abortRequest(): void;
    /**
     * 获取当前的 AbortSignal，供 fetch/axios 请求使用
     */
    protected get abortSignal(): AbortSignal;
    /**
     * 停止（暂停）任务
     */
    pause(): Promise<void>;
    /**
     * 取消任务
     */
    cancel(): Promise<void>;
    /**
     * 开始计算速度
     */
    protected startCalcSpeed(): void;
    /**
     * 停止计算速度
     */
    protected pauseCalcSpeed(): void;
    /**
     * 计算平滑速度（滑动平均）
     */
    protected calcSmoothSpeed(speedList: number[]): number;
    /**
     * 计算总平均速度
     */
    protected calcTotalAvgSpeed(): void;
    /**
     * 检查超时
     */
    protected checkTimeout(): Promise<void>;
    /**
     * 更新进度
     * @param loaded 当前已处理的总字节数
     * @param options 选项
     */
    protected updateProgress(loaded: number, options?: {
        immediately?: boolean;
        init?: boolean;
    }): void;
    /**
     * 改变状态
     */
    protected changeState(state: TaskStatus, error?: SMHError): Promise<void>;
    /**
     * 通知进度
     */
    protected notifyProgress(state: string, progress: number): void;
    /**
     * 处理错误
     */
    protected handleError(e: Error): Promise<SMHError>;
}