How to create a Computed Attribute that updates based on the content?

[jonathanmach]

Hi all, I hope you're all safe!

I'm trying to implement a custom Node, that extends tiptap.Heading, and adds an id attribute:

export class Heading extends tiptap.Heading {
  get schema() {
    return {
      attrs: {
        level: {
          default: 1,
        },
        id: {
          default: null,
        },
      },
...

The reason for that is because I want to automatically generate heading anchors, based on the text.
However, I haven't figured out how to update attrs.id every time the heading content changes. I tried to use ProseMirror compute attribute instead of default but it didn't do anything.

Any suggestions on how to approach this scenario?

Thank you in advance!