Add Ember Application/Engine#buildInstance()

types/ember/index.d.ts

@@ -496,6 +496,10 @@ declare module 'ember' {
              *  object when the boot process is complete.
              */
             boot(): Promise<Application>;
+            /**
+             * Create an ApplicationInstance for this Application.
+             */
+            buildInstance(options?: object): ApplicationInstance;
         }
         /**
         The `ApplicationInstance` encapsulates all of the stateful aspects of a
@@ -1113,6 +1117,10 @@ declare module 'ember' {
              * Set this to provide an alternate class to `Ember.DefaultResolver`
              */
             resolver: Resolver;
+            /**
+             * Create an EngineInstance for this Engine.
+             */
+            buildInstance(options?: object): EngineInstance;
         }
         /**
          * The `EngineInstance` encapsulates all of the stateful aspects of a

types/ember/test/application.ts

@@ -33,3 +33,9 @@ let App2 = BaseApp.create({
         mouseleave: null
     }
 });
+
+let App3 = BaseApp.create();
+
+let App3Instance1 = App3.buildInstance();
+
+let App3Instance2 = App3.buildInstance({ foo: 'bar' });

types/ember/test/engine.ts

@@ -0,0 +1,41 @@
+import Ember from 'ember';
+import { assertType } from "./lib/assert";
+
+let BaseEngine = Ember.Engine.extend({
+    modulePrefix: 'my-engine'
+});
+
+BaseEngine.initializer({
+    name: 'my-initializer',
+    initialize(engine) {
+        engine.register('foo:bar', Ember.Object.extend({ foo: 'bar' }));
+    }
+});
+
+BaseEngine.instanceInitializer({
+    name: 'my-instance-initializer',
+    initialize(engine) {
+        engine.lookup('foo:bar').get('foo');
+    }
+});
+
+let Engine1 = BaseEngine.create({
+    rootElement: '#engine-one',
+    customEvents: {
+        paste: 'paste'
+    }
+});
+
+let Engine2 = BaseEngine.create({
+    rootElement: '#engine-two',
+    customEvents: {
+        mouseenter: null,
+        mouseleave: null
+    }
+});
+
+let Engine3 = BaseEngine.create();
+
+let Engine3Instance1 = Engine3.buildInstance();
+
+let Engine3Instance2 = Engine3.buildInstance({ foo: 'bar' });

types/ember/tsconfig.json

@@ -24,6 +24,7 @@
         "test/application.ts",
         "test/access-modifier.ts",
         "test/application-instance.ts",
+        "test/engine.ts",
         "test/engine-instance.ts",
         "test/ember-tests.ts",
         "test/error.ts",