diff --git a/src/dom_components/index.ts b/src/dom_components/index.ts
index 1c9988363..10ad17217 100644
--- a/src/dom_components/index.ts
+++ b/src/dom_components/index.ts
@@ -80,7 +80,7 @@ import ComponentTextNode from './model/ComponentTextNode';
 import ComponentVideo from './model/ComponentVideo';
 import ComponentWrapper from './model/ComponentWrapper';
 import Components from './model/Components';
-import { ComponentAdd, ComponentDefinition, ComponentDefinitionDefined } from './model/types';
+import { ComponentAdd, ComponentDefinition, ComponentDefinitionDefined, ComponentStackItem } from './model/types';
 import ComponentCommentView from './view/ComponentCommentView';
 import ComponentFrameView from './view/ComponentFrameView';
 import ComponentImageView from './view/ComponentImageView';
@@ -164,7 +164,7 @@ export interface CanMoveResult {
 }
 
 export default class ComponentManager extends ItemManagerModule<DomComponentsConfig, any> {
-  componentTypes = [
+  componentTypes: ComponentStackItem[] = [
     {
       id: 'cell',
       model: ComponentTableCell,
diff --git a/src/dom_components/model/ComponentMap.ts b/src/dom_components/model/ComponentMap.ts
index 32cb908c4..af631566e 100644
--- a/src/dom_components/model/ComponentMap.ts
+++ b/src/dom_components/model/ComponentMap.ts
@@ -25,13 +25,13 @@ export default class ComponentMap extends ComponentImage {
           label: 'Address',
           name: 'address',
           placeholder: 'eg. London, UK',
-          changeProp: 1,
+          changeProp: true,
         },
         {
           type: 'select',
           label: 'Map type',
           name: 'mapType',
-          changeProp: 1,
+          changeProp: true,
           options: [
             { value: 'q', name: 'Roadmap' },
             { value: 'w', name: 'Satellite' },
@@ -41,9 +41,9 @@ export default class ComponentMap extends ComponentImage {
           label: 'Zoom',
           name: 'zoom',
           type: 'range',
-          min: '1',
-          max: '20',
-          changeProp: 1,
+          min: 1,
+          max: 20,
+          changeProp: true,
         },
       ],
     };
diff --git a/src/dom_components/model/types.ts b/src/dom_components/model/types.ts
index 26a9822c9..67881100a 100644
--- a/src/dom_components/model/types.ts
+++ b/src/dom_components/model/types.ts
@@ -6,6 +6,7 @@ import { TraitProperties } from '../../trait_manager/model/Trait';
 import Traits from '../../trait_manager/model/Traits';
 import { ResizerOptions } from '../../utils/Resizer';
 import { DomComponentsConfig } from '../config/config';
+import ComponentView from '../view/ComponentView';
 import Component from './Component';
 import Components from './Components';
 import { ToolbarButtonProps } from './ToolbarButton';
@@ -14,6 +15,12 @@ export type DragMode = 'translate' | 'absolute' | '';
 
 export type DraggableDroppableFn = (source: Component, target: Component, index?: number) => boolean | void;
 
+export interface ComponentStackItem {
+  id: string;
+  model: typeof Component;
+  view: typeof ComponentView;
+}
+
 /**
  * Delegate commands to other components.
  */