Optimize jpeg and png images

optimizeImage.js

const imagemin = require('imagemin');
const imageminJpegTran = require('imagemin-jpegtran');
const imageminPngQuant = require('imagemin-pngquant');
const imageminJpegRecompress = require('imagemin-jpeg-recompress');
const fs = require('fs');

async function optimizeImageBuffer(buffer) {
	return imagemin.buffer(buffer, {
        plugins: [
            imageminJpegRecompress({
                quality: 'high',
            }),
            imageminJpegTran(),
            imageminPngQuant({ 
                quality: [0.6, 0.8],
                strip: true,
            }),
        ]
    })
}

// Promisify is function is in another gist which converts callback fashion to promise fashion.
// https://gist.github.com/Deepak13245/129ecdbb72c9f0f81827eb421260a8da
const readFile = promisify(fs.readFile);
const writeFile = promisify(fs.writeFile);

async function optimizeImage(src, dest) {
  const buffer = await readFile(src);
  const optimizedBuffer = await optimizeImageBuffer(buffer);
  await writeFile(dest, optimizedBuffer);
}