MC-3095: Display TypeScript errors within local build process

- Fix default exported interfaces

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/js/converter/converter-interface.js

@@ -8,7 +8,7 @@ import {DataObject} from "../data-store";
 /**
  * @api
  */
-export default interface ConverterInterface {
+interface ConverterInterface {
     /**
      * Convert value to internal format
      *
@@ -26,3 +26,5 @@ export default interface ConverterInterface {
      */
     toDom(name: string, data: DataObject): string | object;
 }
+
+export default ConverterInterface;

app/code/Magento/PageBuilder/view/adminhtml/web/js/mass-converter/converter-interface.js

@@ -6,7 +6,7 @@
 /**
  * @api
  */
-export default interface ConverterInterface {
+interface ConverterInterface {
     /**
      * Process data after it's read and converted by element converters
      *
@@ -26,6 +26,8 @@ export default interface ConverterInterface {
     toDom(data: ConverterDataInterface, config: ConverterConfigInterface): object;
 }
 
+export default ConverterInterface;
+
 export interface ConverterDataInterface {
     [key: string]: any;
 }

app/code/Magento/PageBuilder/view/adminhtml/web/js/property/property-reader-interface.js

@@ -6,7 +6,7 @@
 /**
  * @api
  */
-export default interface PropertyReaderInterface {
+interface PropertyReaderInterface {
     /**
      * Read element data
      *
@@ -15,3 +15,5 @@ export default interface PropertyReaderInterface {
      */
     read(element: HTMLElement): string | object;
 }
+
+export default PropertyReaderInterface;