client.js

import { addons } from '@storybook/preview-api'
import { FORCE_RE_RENDER } from '@storybook/core-events'
import { setCurrentStory, changeKnob } from './common'

window.__setCurrentStory = function (categorization, story) {
  setCurrentStory(categorization, story)
  forceReRender()
}

window.__changeKnob = function (changedKnob) {
  changeKnob(changedKnob)

  // force story to rerender with updated knob
  forceReRender()
}

function forceReRender() {
  addons.getChannel().emit(FORCE_RE_RENDER)
}