sharp.js

const fs = require('fs');
const sharp = require('sharp');


fs.readdirSync('./images').forEach(file => {
    const buff = fs.readFileSync(`./images/${file}`);

    sharp(buff).toFile('images/output.webp', (err, info) => {
        if (err)
            console.error(err);

        console.info(info);
    });
})