API example for new modal manager

modals.js

const viewModel = {
  name: 'John',
  credit: false,
}

const [openModal, closeModal] = modalManager.fire({ content: '#foo-tmpl', viewModel })

openModal
  .then(() => console.log('modal opened'))
  
closeModal
  .then((val) => console.log('modal closed, resolved with value', val))

oldstyle.js

const viewModel = {
  name: 'John',
  credit: false,
}

sitemodal.fire({ content: '#foo-tmpl', viewModel },
  () => console.log('modal opened'),
  () => console.log('modal closed, no return value')
)