Immobservable?

immobservable.js

import mobservable from 'mobservable/immutable' // Separate module needed?
                                                // Not sure, but basically we need 
                                                // to mark it as immutable somehow

let user = mobservable.fromJson({ 
  name: 'Matt',
  age: 'NunYoBiznis'
})

user.name //= 'Matt'
user.name = 'Matthew' // ignored
user.name //= 'Matt'

mobservable.transaction(() => {
  user.name = 'Matthew' // applied
  user.name //= 'Matthew'
})

👍
See: mobxjs/mobx#9