Input-specific event handling by using a single pointer event you can use the pointerType property

index.js

// https://w3c.github.io/pointerevents/

foo.addEventListener('pointerdown', e => {
  switch (e.pointerType) {
  case 'mouse':
    // mouse detected
    break
  case 'pen':
    // pen / stylus detected 
    break;
  case 'touch':
    // touch detected 
    break
  default:
    // pointerType unknown or cannot be detected 
  }
})