我的需求是要对数据库中的标注数据进行导出，用到fs-extra，下面附上demo代码

import * as path from "path";
import * as fse from "fs-extra";
const subdir = path.join(__dirname, "subdir");
const pathExists = await fse.pathExists(subdir);
if (!pathExists) {await fse.mkdir(subdir);
}
const file = path.join(subdir, "file.txt");
const stream = fse.createWriteStream(file);
await new Promise<void>((resolve, reject) =>stream.write("hello\r\nworld", err => (err ? reject(err) : resolve()))
);
stream.close();

其中换行直接使用换行符\r\n就行