main.js

componentDidMount() {
  this.checkLogin()
}

checkLogin = () => {
  if (!localStorage.getItem(AppString.ID)) {
    this.setState({
      isLoading: false
    }, () => {
      this.props.history.push('/')
    })
  } else {
    this.getListUser()
  }
}

getListUser = async () => {
  const result = await myFirestore.collection(AppString.NODE_USERS).get()
  if (result.docs.length > 0) {
    this.listUser = [...result.docs]
    this.setState({
      isLoading: false
    })
  }
}