jbouny

var GIFEncoder = require('gifencoder');
 
function createGifEncoder(resolution, response) {
 
  var encoder = new GIFEncoder(resolution.x * 32, resolution.y * 32);
 
  var stream = encoder.createReadStream();
  response.type("gif");
  stream.pipe(response);
 

jbouny

var Whammy = require('node-whammy'),
    sharp = require('sharp');

function canvasToWebp(canvas, callback) {

  sharp(canvas.toBuffer()).toFormat(sharp.format.webp).toBuffer(function(e, webpbuffer) {
    var webpDataURL = 'data:image/webp;base64,' + webpbuffer.toString('base64');
    callback(webpDataURL);
  });