sharp.es6

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

// Read image data from readableStream, resize and write image data to writableStream

for (var i=0; i < 100; i++) {
    var rs = fs.createReadStream('./direct.png');
    var ws = fs.createWriteStream(`./thumbs/direct-thumb-${i}.png`);
    rs.pipe(sharp()
        .resize(437, 315)
        .on('error', function(err) {
            console.log(err);
        })).pipe(ws);
}