I'm trying to implement this answer on typescript, https://stackoverflow.com/a/47570603/8503317 on create Line, there is this options

var line = new fabric.Line(points, {
  strokeWidth: 2,
  fill: '#999999',
  stroke: '#999999',
  originX: 'center',
  originY: 'center',
  selectable: false,
  hasBorders: false,
  hasControls: false,
  evented: false,
  class:'line', //THIS DOESN'T EXIST ON FABRIC.LINE OPTIONS

here's the codepen

But on that codepen, it is working and don't have any error. does anyone knows why?

EDIT

Here's my reproduce https://stackblitz.com/edit/angular-ivy-bkaelf?file=src%2Fapp%2Fapp.component.ts