google-maps.js

import {div, thunk} from '@motorcycle/dom'

function googleMaps(center, zoom) {
  return div({
    hook: {
      insert({elm}) {
        const map = new google.maps.Map(elm, {
          center,
          zoom,
        })
      },
      
      update(oldVNode, newVNode) {
        // compare the oldVnode against the newVNode
        // update whatever you need based on the new state
      },
    }
  })
}

function view(state$) {
  return state$.map(state => {
    div([
      thunk('map', googleMaps, state.counter, state.zoom)
    ])
  })
}