login.duck.js

{
  on: 'login_submitted',
  when: ({ event }) => isValid(event.email, event.password),
  reaction: ({ event }) => broadcast('on_request', {
    type: 'login',
    path: '/api/login',
    params: { ...event }
  }),
  reactionElse: () => alert('Invalid parameters'),
},
{
  on: 'request_success',
  when: ({ event }) => event.type === 'login',
  reducer: ({ state, event }) => ({ ...state, user: event.user }),
  reaction: () => broadcast('on_route_change', { to: 'dashboard' })
},
{
  on: 'request_fail',
  when: ({ event }) => event.type === 'login',
  reaction: ({ event }) => alert(`Failed: ${event.message}`)
}