ReactJs to Pure Js with setState

ReactToJs-setState.jsx

// FROM: ReactJs
activateChat() {
  this.setState({ isChatActive: true });
}

// TO: Js
setState = (updatedState: Object) => {
  this.state = {...this.state, ...updatedState};
  setTimeout(() => this.updateClasses());
}

updateClasses = () => {
  const bubbleEl = document.getElementById(CHAT_BUBBlE_ID);
  if (bubbleEl) {
    const bubbleCssClasses = this.getBubbleElementClasses();
    const bubbleCssStyles = this.getBubbleElementStyles();
    bubbleEl.setAttribute('class', bubbleCssClasses);
    Object.assign(bubbleEl.style, bubbleCssStyles);
  }
  ...
  this.updateChildClasses();
  ...
}

activateChat() {
  this.setState({ isChatActive: true });
}