1.ts

interface IcompressSvga {
  (path: string, source: Buffer): () => Promise<Idetail>
}
let compressSvga: IcompressSvga
compressSvga = (path, source) => {
  return async () => {
    const result = {
      input: 0,
      output: 0,
      ratio: 0,
      path,
      file: source,
      msg: ''
    }
    try {
      const data = ProtoMovieEntity.decode(
        pako.inflate(toArrayBuffer(source))
      ) as unknown as IsvgaData
      const { images } = data
      const list = Object.keys(images).map(path => {
        return compressImg({ path, file: toBuffer(images[path]) })
      })

      const detail = await Promise.all(list.map(fn => fn()))
      detail.forEach(({ path, file }) => {
        data.images[path] = file
      })

      const file = pako.deflate(
        toArrayBuffer(ProtoMovieEntity.encode(data).finish() as Buffer)
      )
      result.input = source.length
      result.output = file.length
      result.ratio = 1 - file.length / source.length
      result.file = file
    } catch (err) {
      result.msg = `[${chalk.blue(path)}] ${chalk.red(JSON.stringify(err))}`
    }
    return result
  }
}