Stimulus.js snippets that are useful for controllers, see it as a playground for now.

controller_stuff.js

import { Controller } from 'stimulus'

export default class extends Controller {

  addClasses(element) {
    let toId = element.dataset.toId
    let toElement
    if (toId) {
      toElement = document.getElementById(toId)
    } else {
      toElement = element
    }
    let classes = element.dataset.addClasses.split(' ')
    toElement.classList.add(...classes)
  }
}