Compress image using NodeJs

compress-image.js

const fs = require("fs");
const imagemin = require("imagemin");
const mozjpeg = require("imagemin-mozjpeg");
const imageminWebp = require('imagemin-webp');
const sharp = require("sharp");
const isJpg = require("is-jpg");

const NEED_FORMAT = "jpeg";

const convertToFormat = async (input) => {
  const starpInput = sharp(input);
  if(NEED_FORMAT === "jpeg"){
    if (isJpg(input)) return input;
    return starpInput.jpeg().toBuffer();
  } else {
    return starpInput.webp().toBuffer();
  }
};

function getPlugins(){
    let plugins = [convertToFormat];
    if(NEED_FORMAT === "jpeg"){
        plugins.push(mozjpeg({ quality: 100, fastCrush: true, tune: "psnr" }));
    } else {
        plugins.push(imageminWebp())
    }
}

const imageFileBuffer = async (buffer) => {
  const miniBuffer = await imagemin.buffer(buffer, {
    plugins: getPlugins()
  });
  return miniBuffer;
};

fs.readFile('./input.png', async (err, data) => {
    if (err) throw err;
    data = Buffer.from(data)
    var output = await imageFileBuffer(data);
    fs.writeFileSync(`output.${NEED_FORMAT}`,output)
});