Gutters

[SandmansDreams]

Can I ask you some questions about gutters? I am trying to make a plugin that uses them but am running into all sorts of trouble. For now, first stage is just getting them to render which I seem to be struggling to do. The only plugin I've found that even uses gutters thus far is this plugin so I would really like to get some of your expertise. Here is the code I have that does not seem to work...

import { Plugin } from 'obsidian';
import { gutter, GutterMarker } from '@codemirror/view';

export class HandleGutter extends GutterMarker { // Gutter for the handles
    constructor(public readonly text: string) { // When object is created, pass a string?
        super();
    }

    toDOM() { // Create the handle
        return document.createTextNode(this.text);
    }

    destroy(dom: HTMLElement): void { // When line is scrolled out of view, remove the rendering of the gutter marker for that line
        if (!document.body.contains(dom)) dom.remove();
    }
 }

export default class Blocks extends Plugin { // The main plugin class
  async onload() { // Things that happen on plugin load
        this.testGutter();
   }

  testGutter() { // Gutter to test how it works
        return new HandleGutter("+");
   }
}

Currently this code seems to do nothing (there is more code around it but this is the simplified form that does not seem to work). The eventual goal is to put a clickable button in the gutter but that will be later down the line. Any ideas, references, or assistance would be greatly appreciated. Thank you.