jpg to webp for node.js

index.js

const fs = require('fs');
const path = require('path');
const CWebp = require('cwebp').CWebp;

module.exports.encode = (imgBuf) => new Promise((resolve, reject) => {
  if (!fs.existsSync('/usr/local/bin/cwebp')) {
    const RESOURCES_DIR = path.join(__dirname, "../bin");
    process.env.PATH += `:${RESOURCES_DIR}`;
    process.env.LD_LIBRARY_PATH += `:${RESOURCES_DIR}`;
  }

  const encoder = new CWebp(imgBuf);
  encoder.quality(80);
  encoder.toBuffer((err, buf) => {
    if (err) reject(err);
    resolve(buf);
  });
});