Deprecation Guide for Function.prototype.property

Historically, Ember has extended the Function.prototype with a few functions (on, observes, property), over time we have moved away from using these prototype extended functions in favor of using the official ES modules based API.

In order to migrate away from Function.prototype.property you would update to using computed from @ember/object (see documentation) directly.

For example, you would migrate from:

import EmberObject from '@ember/object';

let Person = EmberObject.extend({
  init() {
    this._super(...arguments);

    this.firstName = 'Betty';
    this.lastName = 'Jones';
  },

  fullName: function() {
    return `${this.firstName} ${this.lastName}`;
  }.property('firstName', 'lastName')
});

let client = Person.create();

client.get('fullName'); // 'Betty Jones'

client.set('lastName', 'Fuller');
client.get('fullName'); // 'Betty Fuller'

Into:

import EmberObject, { computed } from '@ember/object';

let Person = EmberObject.extend({
  init() {
    this._super(...arguments);

    this.firstName = 'Betty';
    this.lastName = 'Jones';
  },

  fullName: computed('firstName', 'lastName', function() {
    return `${this.firstName} ${this.lastName}`;
  })
});

let client = Person.create();

client.get('fullName'); // 'Betty Jones'

client.set('lastName', 'Fuller');
client.get('fullName'); // 'Betty Fuller'

Please review the deprecation RFC over at emberjs/rfcs for more details.