diff --git a/types/backbone.marionette/backbone.marionette-tests.ts b/types/backbone.marionette/backbone.marionette-tests.ts
index 2b86849622..643146ee52 100644
--- a/types/backbone.marionette/backbone.marionette-tests.ts
+++ b/types/backbone.marionette/backbone.marionette-tests.ts
@@ -114,7 +114,11 @@ class MyBaseView extends Marionette.View<MyModel> {
 }
 
 class MyView extends Marionette.View<MyModel> {
-    behaviors: any;
+    behaviors: any = {
+        DestroyWarn: {
+            message: 'hello'
+        }
+    };
 
     constructor(model: MyModel) {
         super({ model });
@@ -122,12 +126,6 @@ class MyView extends Marionette.View<MyModel> {
         this.ui = {
             destroy: '.destroy'
         };
-
-        this.behaviors = {
-            DestroyWarn: {
-                message: 'hello'
-            }
-        };
     }
 
     template() {
diff --git a/types/ember/test/inject.ts b/types/ember/test/inject.ts
index aed79066c8..de1dc9d854 100755
--- a/types/ember/test/inject.ts
+++ b/types/ember/test/inject.ts
@@ -5,7 +5,7 @@ class AuthService extends Ember.Service {
 }
 
 class ApplicationController extends Ember.Controller {
-    model: {};
+    model = {};
     string: string;
     transitionToLogin() {}
 }
diff --git a/types/ember/test/private/computed-tests.ts b/types/ember/test/private/computed-tests.ts
index fc810e64ff..4eaa024fbe 100644
--- a/types/ember/test/private/computed-tests.ts
+++ b/types/ember/test/private/computed-tests.ts
@@ -12,13 +12,11 @@ class Example1 extends Ember.Object.extend({
     lastName: '',
     allNames: Ember.computed('fullName', function() {
         return [this.fullName];
-    }),
+    }) as Ember.ComputedProperty<string[]>,
     fullName: Ember.computed('firstName', 'lastName', function() {
         return `${this.firstName} ${this.lastName}`;
     })
 }) {
-    allNames!: Ember.ComputedProperty<string[]>;
-    fullName!: Ember.ComputedProperty<string>;
 }
 
 const unwrappedGetters1: UnwrapComputedPropertyGetters<Example1> = {} as any;
diff --git a/types/ember/v2/test/inject.ts b/types/ember/v2/test/inject.ts
index 3ea0176ea6..8b023c5bbd 100755
--- a/types/ember/v2/test/inject.ts
+++ b/types/ember/v2/test/inject.ts
@@ -5,7 +5,7 @@ class AuthService extends Ember.Service {
 }
 
 class ApplicationController extends Ember.Controller {
-    model: {};
+    model = {};
     string: string;
     transitionToLogin() {}
 }
diff --git a/types/leaflet/leaflet-tests.ts b/types/leaflet/leaflet-tests.ts
index fe9af41ea6..dd2f38a688 100644
--- a/types/leaflet/leaflet-tests.ts
+++ b/types/leaflet/leaflet-tests.ts
@@ -699,7 +699,6 @@ const AsyncCanvasLayer = L.GridLayer.extend({
 });
 
 export class ExtendedTileLayer extends L.TileLayer {
-	options: L.TileLayerOptions;
 	createTile(coords: L.Coords, done: L.DoneCallback) {
 		const newCoords: L.Coords = (new L.Point(coords.x, coords.y) as L.Coords);
 		newCoords.z = coords.z;
diff --git a/types/ol/ol-tests.ts b/types/ol/ol-tests.ts
index 36d020e7d2..f065270316 100644
--- a/types/ol/ol-tests.ts
+++ b/types/ol/ol-tests.ts
@@ -300,7 +300,6 @@ interface CustomControlOptions extends ControlOptions {
 }
 
 class CustomControl extends Control {
-    element: HTMLElement;
     name: string;
     mapViewport?: HTMLElement;
     private readonly _boundListener: (e: Event) => void;
diff --git a/types/polymer-ts/polymer-ts-tests.ts b/types/polymer-ts/polymer-ts-tests.ts
index 3a9baf0e54..b9c398b121 100644
--- a/types/polymer-ts/polymer-ts-tests.ts
+++ b/types/polymer-ts/polymer-ts-tests.ts
@@ -2,7 +2,6 @@ namespace Components {
 	export class TestComponent extends polymer.Base {
 
 		public field: string = 'foo';
-		public is: string;
 		
 		constructor() {
 			super();
diff --git a/types/skatejs/test/components/no-shadow-root.ts b/types/skatejs/test/components/no-shadow-root.ts
index 5b7cee16e5..18481ce060 100644
--- a/types/skatejs/test/components/no-shadow-root.ts
+++ b/types/skatejs/test/components/no-shadow-root.ts
@@ -59,7 +59,7 @@ class Mo extends MComponent<Props, State> {
 }
 
 class Mo2 extends MComponent2 {
-  props: Props;
+  props: Props = { greet: "hi" };
   foo() {
     this.props.greet;
   }