Enable usage in Ember 2.9 beta and above.

app-lt-2-9/instance-initializers/browser/head.js

@@ -0,0 +1,21 @@
+import Ember from 'ember';
+import ENV from '../../config/environment';
+
+export function initialize(instance) {
+  if (ENV['ember-cli-head'] && ENV['ember-cli-head']['suppressBrowserRender']) { return true; }
+
+  // clear fast booted head (if any)
+  Ember.$('meta[name="ember-cli-head-start"]')
+    .nextUntil('meta[name="ember-cli-head-end"] ~')
+    .addBack()
+    .remove();
+  const container = instance.lookup ? instance : instance.container;
+  // const renderer = container.lookup('renderer:-dom');
+  const component = container.lookup('component:head-layout');
+  component.appendTo(document.head);
+}
+
+export default {
+  name: 'head-browser',
+  initialize: initialize
+};

app-lt-2-9/instance-initializers/fastboot/head.js

@@ -0,0 +1,19 @@
+export function initialize(instance) {
+  const renderer = instance.lookup('renderer:-dom');
+  const componentFactory =
+          instance._lookupFactory('component:head-layout');
+  // explicitly set renderer & domhelper since we're in fastboot
+  const component = componentFactory.create(
+    instance.ownerInjection(),
+    {
+      renderer,
+      _domHelper: renderer._dom
+    }
+  );
+  component.appendTo(renderer._dom.document.head);
+}
+
+export default {
+  name: 'head-fastboot',
+  initialize: initialize
+};

app/instance-initializers/browser/head.js

@@ -1,17 +1,16 @@
 import Ember from 'ember';
 import ENV from '../../config/environment';
 
-export function initialize(instance) {
+export function initialize(owner) {
   if (ENV['ember-cli-head'] && ENV['ember-cli-head']['suppressBrowserRender']) { return true; }
 
   // clear fast booted head (if any)
   Ember.$('meta[name="ember-cli-head-start"]')
     .nextUntil('meta[name="ember-cli-head-end"] ~')
     .addBack()
     .remove();
-  const container = instance.lookup ? instance : instance.container;
-  // const renderer = container.lookup('renderer:-dom');
-  const component = container.lookup('component:head-layout');
+
+  const component = owner.lookup('component:head-layout');
   component.appendTo(document.head);
 }
 

app/instance-initializers/fastboot/head.js

@@ -1,16 +1,8 @@
-export function initialize(instance) {
-  const renderer = instance.lookup('renderer:-dom');
-  const componentFactory =
-          instance._lookupFactory('component:head-layout');
-  // explicitly set renderer & domhelper since we're in fastboot
-  const component = componentFactory.create(
-    instance.ownerInjection(),
-    {
-      renderer,
-      _domHelper: renderer._dom
-    }
-  );
-  component.appendTo(renderer._dom.document.head);
+export function initialize(owner) {
+  const document = owner.lookup('service:-document');
+  const component = owner.lookup('component:head-layout');
+
+  component.appendTo(document.head);
 }
 
 export default {

index.js

@@ -1,12 +1,26 @@
 /* jshint node: true */
 'use strict';
 
+var path = require('path');
 var filterInitializers = require('fastboot-filter-initializers');
+var VersionChecker = require('ember-cli-version-checker');
+var mergeTrees = require('broccoli-merge-trees');
 
 module.exports = {
   name: 'ember-cli-head',
 
-  treeForApp: function(tree) {
+  treeForApp: function(defaultTree) {
+    var checker = new VersionChecker(this);
+    var emberVersion = checker.for('ember', 'bower');
+
+    var trees = [defaultTree];
+
+    if (emberVersion.lt('2.9.0-alpha.4')) {
+      trees.push(this.treeGenerator(path.resolve(this.root, 'app-lt-2-9')));
+    }
+
+    var tree = mergeTrees(trees, { overwrite: true });
+
     return filterInitializers(tree);
   }
 };

package.json

@@ -43,9 +43,11 @@
     "ember-addon"
   ],
   "dependencies": {
+    "broccoli-merge-trees": "^1.1.4",
+    "ember-cli-babel": "^5.1.5",
     "ember-cli-htmlbars": "^1.0.1",
-    "fastboot-filter-initializers": "0.0.1",
-    "ember-cli-babel": "^5.1.5"
+    "ember-cli-version-checker": "^1.1.6",
+    "fastboot-filter-initializers": "0.0.1"
   },
   "ember-addon": {
     "configPath": "tests/dummy/config"