gm

const gm = require('gm').subClass({ imageMagick: true }); // Enable ImageMagick integration.

gm()
  .command("convert")
  .in(imageIn)
  .borderColor("white")
  .border(1, 1)
  .fill("none")
  .fuzz(`${fuzz}%`)
  .draw("matte 1,1 floodfill")
  .shave(1, 1)
  .matte()
  .write(`/tmp/${randomFileName}transparent.png`, function(err, bufferOut) {
      if (err) {
          callback(err);
      } else {
          callback(null, `/tmp/${randomFileName}transparent.png`, randomFileName);
      }
  });