gistfile1.txt

const message = document.getElementById('message')
const form = document.getElementById('sign-in')
const username = document.getElementById('userName')
const password = document.getElementById('password')

form.addEventListener('submit', (event) => {
  event.preventDefault()

  const localUser = localStorage.getItem('user')
  console.log('localUser', localUser)
  console.log('localUser.username', localUser.username)
  const user = JSON.parse(localUser)
  console.log('user', user)
  console.log('user.username', user.username)

  if (username.value !== user.username || password.value !== user.password) {
    message.innerHTML = 'Register before sign in'
    return
  }

  sessionStorage.setItem('login', true)
  window.location.href = './html/index.html'
})