Modern Front-End Development for Rails (beta 6 pg 37) - Stimulus targets issues

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This might be a change in how the released version of Stimulus 2.0 handles implicit properties, but I was getting the same error on line 6. Just removing the line with the property declaration caused the code to work.

// app/javascripts/controllers/day_toggle_controller.ts
import { Controller } from "stimulus"

export default class DayToggleController extends Controller {
  static targets = ["thingToHide"]

  // This was the offending line. Was expecting a different error when commented out, but it worked 
  // thingToHideTarget: HTMLElement

  toggle() {
    console.log('Click! Click! Boom!')
    this.thingToHideTarget.classList.toggle("is-hidden")
  }
}

I’m only on page 37 and don’t know Typescript or Stimulus, so I don’t know if this will cause problems later on.

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