Usage no npm install needed!

<script type="module">
  import emberObservableSetChaining from 'https://cdn.skypack.dev/ember-observable-set-chaining';
</script>

README

Ember.Observable `set` chaining

Restores the 1.X behavior that allowed chaining set, setProperties, and [increment|decrement|toggle]Property calls.

// Ember 2.X without this addon
Ember.Logger.log(foo.set('bar', true)); // true
Ember.Logger.log(foo.setProperties({ baz: false )); // { baz: false }

// Ember 1.X without this addon
Ember.Logger.log(foo.set('bar', true)); // foo
Ember.Logger.log(foo.setProperties({ baz: false )); // foo

// Ember 2.X with this addon
Ember.Logger.log(foo.set('bar', true)); // foo
Ember.Logger.log(foo.setProperties({ baz: false )); // foo

This essentially "undoes" the work of ember/ember.js#11213.

ember install ember-observable-set-chaining