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+- Start Date: 2019-08-15
+- Relevant Team(s): Ember.js, Learning
+- RFC PR: https://github.com/emberjs/rfcs/pull/528
+- Tracking: (leave this empty)
+
+# Deprecate Eventing from Ember
+
+## Summary
+
+Deprecation support for Events within Ember.
+
+This includes deprecating the `Evented` Mixin, and methods exposed in the `@ember/object/events` and `@ember/object/evented` packages.
+
+## Motivation
+
+Eventing is something that is no longer core to Ember, and is no longer used internally after changes from all the work on Octane.
+
+One pillar of the Ember 2019-2020 roadmap is to "Continue Simplifying Ember". This deprecation aligns with that pillar as deprecating eventing will reduce the surface area of Ember and ensure that Ember is not maintaining a feature that is available and stable in several other libraries.
+
+## Transition Path
+
+If a developer still wishes to use the eventing pattern, the recommendation is to use a third-party library.
+
+There are several eventing libraries available which are stable and well supported. Some examples include, but are not limited to:
+* events (https://www.npmjs.com/package/events)
+* eventemitter3 (https://www.npmjs.com/package/eventemitter3)
+* event-kit (https://www.npmjs.com/package/event-kit)
+
+Any objects that currently make use eventing pattern will need to create an instance of an emitter and use that emitter instance to subscribe to and emit events.
+
+For example this code which makes use of the Evented mixin:
+
+```
+import Evented, { on } from `@ember/object/evented';
+
+const EventedObject = EmberObject.extend(Evented, {
+    eventHandler: on('outputMessage', function() {
+        console.log('Outputting message from handler inside object');
+    })
+});
+const eventedObj = EventedObject.create({})
+
+const handler = (params1, param2) => {  console.log(`Let's ${param1} ${param2}!`); };
+eventedObj.on('outputMessage', handler);
+eventedObj.trigger('outputMessage', 'Deprecate', 'Events');
+/* console log
+ * Outputting message from handler inside object
+ * Let's Deprecate Events!
+ */
+eventedObj.off('outputMessage', handler)
+```
+
+and this functionally equivalent code which makes use of the methods from the `@ember/object/events` package:
+
+```
+import { addListener, removeListener, sendEvent } from `@ember/object/events;
+
+const EventedObject = EmberObject.extend({
+    init() {
+        addListener(this, 'outputMessage', this, 'eventHandler');
+    },
+
+    eventHandler() {
+        console.log('Outputting message from handler inside object');
+    }
+});
+const eventedObj = EventedObject.create({});
+
+const handler = () => {  console.log('Outputting message from handler outside object'); };
+addListener(eventedObj, 'outputMessage', handler);
+sendEvent(eventedObj, 'outputMessage', ['Deprecate', 'Events']);
+/* console log
+ * Outputting message from handler inside object
+ * Let's Deprecate Events!
+ */
+removeListener(eventedObj, 'outputMessage', handler);
+```
+
+can be rewritten using the third-party library `eventemitter3` as such
+
+```
+import EventEmitter from 'eventemitter3';
+
+const EventedObject = EmberObject.extend({
+    init() {
+        this.emitter = new EventEmitter();
+        this.emitter.on('outputMessage', this.eventHandler, this);
+    },
+
+    eventHandler() {
+        console.log('Outputting message from handler inside object');
+    }
+});
+
+const eventedObj = EventedObject.create({});
+const handler = (params1, param2) => {  console.log(`Let's ${param1} ${param2}!`); };
+eventedObj.emitter.on('outputMessage', handler);
+eventedObj.emitter.emit('outputMessage', 'Deprecate', 'Events');
+/* console log
+ * Outputting message from handler inside object
+ * Let's Deprecate Events!
+ */
+eventedObj.emitter.off('outputMessage', handler);
+```
+
+To be more specific each Evented mixin method and each function exported by `@ember/object/events` has a straightforward mapping to a method in the `eventemitter3` library as follows:
+
+* on/addListener:  
+`eventedObj.on(eventName, target, method)` OR `addListener(eventedObj, eventName, target, method)` OR `handler: on(eventName, method)` corresponds to
+```
+eventedObj.emitter.on(eventName, method, target)
+```
+
+* one/addListener:  
+`eventedObj.one(eventName, target, method)` or `addListener(eventedObj, eventName, target, method, true)` corresponds to
+```
+eventedObj.emitter.once(eventName, method, target);
+```
+
+* off/removeListener:  
+`eventedObj.off(eventName, target, method)` or `removeListener(eventedObj, eventName, target, method)` corresponds to
+```
+eventedObj.emitter.off(eventName, method, target);
+```
+
+* trigger/sendEvent:
+`eventedObj.trigger(eventName, param1, param2, ..., paramN)` or `sendEvent(eventedObj, eventName, [param1, param2, ..., paramN])` corresponds to
+```
+eventedObj.emitter.emit(eventName, param1, param2, ..., paramN);
+```
+
+* has:  
+`eventedObj.has(eventName)` would correspond to
+```
+eventedObj.emitter.listenerCount(eventName) > 0
+```
+
+## How We Teach This
+
+The guides currently make no mention of the Evented mixin or the methods exposed in `@ember/objects/events`. Thus, the best place to teach this would be in the API documentation.
+
+The Evented Mixin and each function in the Evented Mixin (`has`, `off`, `on`, `one`, `trigger`) would be marked as deprecated and the mixin/function documentation could point to this RFC or explicitly include an example of how to make use of a third-party library instead.
+Similarly, each function exported from `@ember/object/events` could be deprecated and include an example of how to make use of a third-party library.
+
+For example (from the documetation of the `trigger` method):
+
+```
+const Person = EmberObject.extend(Evented);
+const person = PersonCreate();
+
+person.on('didEat', function(food) {
+    console.log('person ate some ' + food);
+});
+
+person.trigger('didEat', 'broccoli');
+
+// outputs: person ate some broccoli
+```
+
+could be written as
+
+```
+import EventEmitter from 'event';
+
+const Person = EmberObject.extend({
+    init() {
+        this._super(...arguments);
+        this.emitter = new EventEmitter()
+    }
+}
+
+person.emitter.on('didEat', function(foo) {
+    console.log('person ate some ' + food);
+});
+
+person.emitter.emit('didEat', 'brocolli');
+
+// outputs: person ate some broccoli
+```
+
+## Drawbacks
+
+This RFC introduces churn in existing apps that make use of the Evented Mixin and Events.
+
+Due to transitioning away from an Ember package and using a third-party library of the developers choice, this seems like it will be difficult / impossible to codemod and be a very manual process. 
+
+## Alternatives
+
+* Do not deprecate Ember Events
+* Deprecate only the `@ember/object/evented` package and Evented Mixin, and keep the `@ember/object/events` package
+
+## Unresolved questions
+
+Can this process be somewhat automated by providing a codemod?