MC-5691: Implement better developer error reporting

- Resolve issues with interface imports

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/ts/js/content-type-move-params.d.ts

@@ -3,7 +3,7 @@
  * See COPYING.txt for license details.
  */
 import ContentTypeInterface from "./content-type";
-import ContentTypeCollectionInterface from "./content-type-collection";
+import ContentTypeCollectionInterface from "./content-type-collection.d";
 
 /**
  * @api

app/code/Magento/PageBuilder/view/adminhtml/web/ts/js/content-type/content-type-redraw-after-event-params.d.ts

@@ -3,7 +3,7 @@
  * See COPYING.txt for license details.
  */
 
-import ContentTypeCollectionInterface from "../content-type-collection";
+import ContentTypeCollectionInterface from "../content-type-collection.d";
 import ContentTypeInterface from "../content-type";
 
 /**

app/code/Magento/PageBuilder/view/adminhtml/web/ts/js/drag-drop/sortable.ts

@@ -7,7 +7,7 @@ import $ from "jquery";
 import ko from "knockout";
 import events from "Magento_PageBuilder/js/events";
 import ContentTypeInterface from "../content-type";
-import ContentTypeCollectionInterface from "../content-type-collection";
+import ContentTypeCollectionInterface from "../content-type-collection.d";
 import createContentType from "../content-type-factory";
 import Preview from "../content-type/preview";
 import Stage from "../stage";

app/code/Magento/PageBuilder/view/adminhtml/web/ts/js/stage-builder.ts

@@ -9,7 +9,7 @@ import loadReader from "Magento_PageBuilder/js/utils/loader";
 import alertDialog from "Magento_Ui/js/modal/alert";
 import * as _ from "underscore";
 import Config from "./config";
-import ContentTypeCollectionInterface from "./content-type-collection";
+import ContentTypeCollectionInterface from "./content-type-collection.d";
 import ContentTypeConfigInterface from "./content-type-config.d";
 import createContentType from "./content-type-factory";
 import ContentTypeInterface from "./content-type.d";

app/code/Magento/PageBuilder/view/adminhtml/web/ts/js/stage.ts

@@ -11,7 +11,7 @@ import alertDialog from "Magento_Ui/js/modal/alert";
 import _ from "underscore";
 import "./binding/sortable";
 import Collection from "./collection";
-import ContentTypeCollectionInterface from "./content-type-collection";
+import ContentTypeCollectionInterface from "./content-type-collection.d";
 import ContentTypeConfigInterface from "./content-type-config";
 import ContentTypeRemovedParamsInterface from "./content-type-removed-params.d";
 import ContentTypeInterface from "./content-type.d";
@@ -122,9 +122,9 @@ export default class Stage {
     /**
      * Return the children of the current element
      *
-     * @returns {KnockoutObservableArray<ContentTypeInterface>}
+     * @returns {KnockoutObservableArray<ContentTypeInterface | ContentTypeCollectionInterface>}
      */
-    public getChildren(): KnockoutObservableArray<ContentTypeCollectionInterface> {
+    public getChildren() {
         return this.collection.getChildren();
     }