4.ts

interface Idownload {
  (path: string): Promise<string>
}
export let download: Idownload
download = (path: string) => {
  const header = new Url.URL(path)
  return new Promise((resolve, reject) => {
    const req = Https.request(header, res => {
      let content = ''
      res.setEncoding('binary')
      res.on('data', data => (content += data))
      res.on('end', () => resolve(content))
    })
    req.on('error', err => reject(err))
    req.end()
  })
}