import fs from "node:fs";
import type { SpawnOptionsWithoutStdio } from "node:child_process";
export declare function getFileSize(filePath: string): Promise<number>;
export declare let isString: (value: unknown) => value is string;
export declare function createReadStream(filePath: string, start: number, numBytes: number, totalBytes: number): [fs.ReadStream, number];
export declare function readBytesFromFile(filePath: string, start: number, numBytes: number, totalBytes: number): Promise<Buffer>;
export declare function streamToBuffer(stream: fs.ReadStream): Promise<Buffer<ArrayBuffer>>;
export declare function readFileAsBase64(filePath: string): Promise<string>;
export declare function md5(data: any): string;
export declare const btoa: (str: string) => string;
export declare const uuid: () => string;
/**
 * 生成dm_cover_img_str
 * @param str 比如：ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0XX)), SwiftShader driver)Google Inc. (Google)
 */
export declare function fakeDmCoverImgStr(str: string): string;
export declare function fakeBuvid3(): string;
export declare function sum(arr: number[]): number;
export declare function spawnChild(command: string, args?: readonly string[], options?: SpawnOptionsWithoutStdio): Promise<string>;
/**
 * 重试函数
 * @param fn 要重试的函数
 * @param times 重试次数
 * @param delay 重试间隔时间
 */
export declare function retry<T>(fn: () => Promise<T>, times?: number, delay?: number): Promise<T>;
interface SubtitleJsonItem {
    from: number;
    to: number;
    location?: number;
    content: string;
}
interface SubtitleJsonData {
    font_size?: number;
    font_color?: string;
    background_alpha?: number;
    background_color?: string;
    stroke?: string;
    body: SubtitleJsonItem[];
}
export declare function subtitleJsonToSrt(data: SubtitleJsonData | {
    body: SubtitleJsonItem[];
}, options?: {
    offset?: number;
}): string;
export {};