Node.js - minify image

index.js

const glob = require('glob')
const mkdirp = require('mkdirp')
const imagemin = require('imagemin')
const pngquant = require('imagemin-pngquant')
const mozjpeg = require('imagemin-mozjpeg')
const gifsicle = require('imagemin-gifsicle')
const svgo = require('imagemin-svgo')
const {
  readFile,
  writeFile
} = require('fs')
const {
  dirname,
  extname,
  join,
  relative
} = require('path')

const plugins = {
  png: pngquant({
    quality: [0.8, 0.9], // 0 ~ 1
    speed: 1
  }),
  jpg: mozjpeg({
    quality: 80 // 0 ~ 100
  }),
  gif: gifsicle({
    optimizationLevel: 3 // 1 ~ 3
  }),
  svg: svgo({
    plugins: [{removeViewBox: false}]
  })
}

glob('src/**/*.+(png|jpg|gif|svg)', (err, files) => {
  if (err) {
    console.log(err)
    return
  }

  for (const file of files) {
    readFile(file, 'base64', (err, img) => {
      if (err) {
        console.log(err)
        return
      }

      if (!img) {
        return
      }

      (async () => {
        const _ext = extname(file).replace('.', '')


        const _buf = await imagemin
          .buffer(Buffer.from(img, 'base64'), {
            plugins: [
              plugins[_ext],
            ],
          })
          .catch((err) => {
            console.log(err)
            return
          })

        const _dest = join('./dest', relative('./src', file))
        
        await mkdirp(dirname(_dest)).catch((err) => {
          if (err) {
            console.log(err)
            return
          }
        })

        writeFile(_dest, _buf, (err) => {
          if (err) {
            console.log(err)
            return
          }
        })

        console.log(`finish: ${ file }`)
      })()
    })
  }
})