import { XhrHeaders } from 'xhr';
export type FileEventName = 'attempt' | 'attemptFailure' | 'chunkSuccess' | 'error' | 'offline' | 'online' | 'progress' | 'success';
export type AllowedMethods = 'PUT' | 'POST' | 'PATCH';
/**
 * 文件分片传输返回结果
 */
export interface ChunkResult {
    DATASOURCEID?: string;
    NAME: string;
    INDEX: number;
    STATE: boolean;
    END: boolean;
    FILEPATH?: string;
}
/**
 * 文件上传配置
 */
export interface FileUploadOptions {
    endpoint: string | ((file?: File) => Promise<string>);
    file: File;
    method?: AllowedMethods;
    headers?: XhrHeaders;
    maxFileSize?: number;
    chunkSize?: number;
    attempts?: number;
    threadNumber?: number;
    /**
     * 单位：秒
     */
    delayBeforeAttempt?: number;
    md5?: string;
}
/**
 * 文件上传类
 */
export declare class FileUpload {
    endpoint: string | ((file?: File) => Promise<string>);
    file: File;
    headers: XhrHeaders;
    method: AllowedMethods;
    chunkSize: number;
    attempts: number;
    delayBeforeAttempt: number;
    md5: string;
    private chunkCount;
    private chunkByteSize;
    private cacheSize;
    private currentMaxIndex;
    private maxFileBytes;
    private endpointValue?;
    private totalChunks;
    private attemptCount;
    private offline;
    private paused;
    private success;
    private isResumed;
    private mapXhrRequest;
    private okRecordList;
    private eventTarget;
    private fileName;
    constructor(options: FileUploadOptions);
    /**
     * 订阅事件
     */
    on(FileEventName: FileEventName, fn: (event: any) => void): void;
    abort(): void;
    pause(): void;
    resume(): Promise<void>;
    /**
     * 发送消息
     */
    private dispatch;
    /**
     *验证参数的正确性
     */
    private validateOptions;
    /**
     * Endpoint can either be a URL or a function that returns a promise that resolves to a string.
     */
    private getEndpoint;
    /**
     * Get portion of the file of x bytes corresponding to chunkSize
     */
    private getChunk;
    private xhrPromise;
    /**
     * Send chunk of the file with appropriate headers and add post parameters if it's last chunk
     */
    private sendChunk;
    /**
     * 失败处理和尝试
     */
    /**
     * 进行分片上传，并处理错误和重试
     */
    private sendChunks;
}
/**
 * 创建文件上传对象方法
 * @param options
 * @returns
 */
export declare const createFileUpload: (options: FileUploadOptions) => FileUpload;