Ember.K was deprecated, so let's remove it.

app/assets/javascripts/discourse/components/d-editor.js.es6

@@ -138,7 +138,7 @@ class Toolbar {
       label: button.label,
       icon: button.label ? null : button.icon || button.id,
       action: button.action || 'toolbarButton',
-      perform: button.perform || Ember.K,
+      perform: button.perform || function() { },
       trimLeading: button.trimLeading
     };
 

app/assets/javascripts/discourse/controllers/topic-bulk-actions.js.es6

@@ -4,6 +4,9 @@ const _buttons = [];
 
 const alwaysTrue = () => true;
 
+function identity() {
+}
+
 function addBulkButton(action, key, opts) {
   opts = opts || {};
 
@@ -72,7 +75,7 @@ export default Ember.Controller.extend(ModalFunctionality, {
     this.perform(operation).then(topics => {
       if (topics) {
         topics.forEach(cb);
-        (this.get('refreshClosure') || Ember.k)();
+        (this.get('refreshClosure') || identity)();
         this.send('closeModal');
       }
     });
@@ -80,7 +83,7 @@ export default Ember.Controller.extend(ModalFunctionality, {
 
   performAndRefresh(operation) {
     return this.perform(operation).then(() => {
-      (this.get('refreshClosure') || Ember.k)();
+      (this.get('refreshClosure') || identity)();
       this.send('closeModal');
     });
   },
@@ -145,7 +148,7 @@ export default Ember.Controller.extend(ModalFunctionality, {
 
       this.perform({type: 'change_category', category_id: categoryId}).then(topics => {
         topics.forEach(t => t.set('category', category));
-        (this.get('refreshClosure') || Ember.k)();
+        (this.get('refreshClosure') || identity)();
         this.send('closeModal');
       });
     },

app/assets/javascripts/discourse/initializers/inject-objects.js.es6

@@ -2,5 +2,5 @@
 
 export default {
   name: "inject-objects",
-  initialize: Ember.K
+  initialize() { }
 };

app/assets/javascripts/discourse/initializers/register-discourse-location.js.es6

@@ -2,5 +2,5 @@
 
 export default {
   name: "register-discourse-location",
-  initialize: Ember.K
+  initialize() { }
 };

app/assets/javascripts/discourse/lib/posts-with-placeholders.js.es6

@@ -56,7 +56,7 @@ export default Ember.Object.extend(Ember.Array, {
   },
 
   finishedPrepending(postIds) {
-    this._changeArray(Ember.K, 0, 0, postIds.length);
+    this._changeArray(function() { }, 0, 0, postIds.length);
   },
 
   objectAt(index) {

app/assets/javascripts/discourse/models/rest.js.es6

@@ -3,7 +3,7 @@ const RestModel = Ember.Object.extend({
   isCreated: Ember.computed.equal('__state', 'created'),
   isSaving: false,
 
-  afterUpdate: Ember.K,
+  afterUpdate() { },
 
   update(props) {
     if (this.get('isSaving')) { return Ember.RSVP.reject(); }

test/javascripts/helpers/qunit-helpers.js.es6

@@ -45,7 +45,7 @@ function acceptance(name, options) {
       resetMobile();
 
       // For now don't do scrolling stuff in Test Mode
-      HeaderComponent.reopen({examineDockHeader: Ember.K});
+      HeaderComponent.reopen({examineDockHeader: function() { }});
 
       resetExtraClasses();
       const siteJson = siteFixtures['site.json'].site;

test/javascripts/test_helper.js

@@ -108,7 +108,7 @@ QUnit.testStart(function(ctx) {
   window.sandbox.stub(ScrollingDOMMethods, "unbindOnScroll");
 
   // Unless we ever need to test this, let's leave it off.
-  $.fn.autocomplete = Ember.K;
+  $.fn.autocomplete = function() { };
 
   // Don't debounce in test unless we're testing debouncing
   if (ctx.module.indexOf('debounce') === -1) {