React form complication 3

state.js

let registration = {
  username: "",
  password: "",
  isRegistering: false,

  onRegister: r => {
    // login(r.username, r.password).then()...
    r.setState({ isRegistering: true })
    setTimeout(() => {
      r.setState({ isRegistering: false })
    }, 2000)
  }
}