/**
 * 附件上传协议：普通文件（带断点续传与合并校验）与视频（分块后确认）。
 * 两套协议的端点、参数大小写、进度算法与收尾都不同，各自照原样实现，不合并成带开关的一套。
 *
 * @author nokecy
 */
import { type AttachmentEnv } from './env';
/** 分块大小，同时也是切块上传的阈值。 */
export declare const CHUNK_SIZE: number;
type Progress = (event: any) => void;
/** 把文件切成 `chunks` 块。 */
export declare const splitFile: (file: Blob, eachSize: number, chunks: number) => Promise<Blob[]>;
/** 普通文件协议。 */
export declare const createFileProtocol: (env: AttachmentEnv) => {
    uploadSingle: (file: any, onProgress: Progress) => Promise<{
        nextchunk: any;
        filename: any;
    }>;
    uploadChunked: (file: any, onProgress: Progress) => Promise<any>;
};
/** 视频协议。 */
export declare const createVideoProtocol: (env: AttachmentEnv) => {
    uploadSingle: (file: any, onProgress: Progress) => Promise<any>;
    uploadChunked: (file: any, onProgress: Progress) => Promise<any>;
};
export {};