Deprecation Guide for Use notifyPropertyChange instead of propertyWillChange and propertyDidChange

Ember.Application#registry / Ember.ApplicationInstance#registry

The private APIs propertyWillChange and propertyDidChange will be removed after the first LTS of the 3.x cycle. You should remove any calls to propertyWillChange and replace any calls to propertyDidChange with notifyPropertyChange. This applies to both the Ember global version and the EmberObject method version.

For example, the following:

Ember.propertyWillChange(object, 'someProperty');
doStuff(object);
Ember.propertyDidChange(object, 'someProperty');

object.propertyWillChange('someProperty');
doStuff(object);
object.propertyDidChange('someProperty');

Should be changed to:

doStuff(object);
Ember.notifyPropertyChange(object, 'someProperty');

doStuff(object);
object.notifyPropertyChange('someProperty');

If you are an addon author and need to support both Ember applications greater than 3.1 and less than 3.1 you can use the polyfill ember-notify-property-change-polyfill