Make transform immutable

[nxmndr]

Hi, I was having a problem with the wrong data (firstTimeData) sent by the following code despite my condition being true.

if (thisIsTheSecondTime) {
  this.form
  .post('route', { attr: secondTimeData }) // sends firstTimeData
} else { // first time goes in else branch
  this.form
  .transform(d => ({ ...d, attr: firstTimeData }))
  .post('route', ...)
}

Turns out transform is mutable ! So it works the first time, but the second time keeps sending the first time data.

Mutability is a source of errors, so I'm wondering if you could make it immutable.

Regards