'prototype' undefined fix for dd-gridstack.js

* fix gridstack#2039
* moved all the D7D gridstack code into the gridstack.ts file as I gave up on the idea to build s a smaller static only code and delay load the D&D (which is much much smaller now)
as it was causing some build issues for some users...

doc/CHANGES.md

@@ -5,6 +5,7 @@ Change log
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 **Table of Contents**  *generated with [DocToc](http://doctoc.herokuapp.com/)*
 
+- [7.1.1-dev (TBD)](#711-dev-tbd)
 - [7.1.1 (2022-11-13)](#711-2022-11-13)
 - [7.1.0 (2022-10-23)](#710-2022-10-23)
 - [7.0.1 (2022-10-14)](#701-2022-10-14)
@@ -76,6 +77,9 @@ Change log
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
+## 7.1.1-dev (TBD)
+* fix [#939](https://github.com/gridstack/gridstack.js/issues/2039) 'prototype' undefined error for dd-gridstack.js
+
 ## 7.1.1 (2022-11-13)
 * fix [#939](https://github.com/gridstack/gridstack.js/issues/939) editable elements focus (regression in v6). Thank you [@Gezdy](https://github.com/Gezdy)
 

spec/gridstack-spec.ts

@@ -1150,7 +1150,7 @@ describe('gridstack', function() {
       let grid = GridStack.init({float: true});
       let items = Utils.getElements('.grid-stack-item');
       let el = items[1];
-      let dd = DDGridStack.get();
+      let dd = GridStack.getDD();
 
       grid.update(el, {noMove: true, noResize: false});
       expect(el.getAttribute('gs-no-move')).toBe('true');
@@ -1478,7 +1478,7 @@ describe('gridstack', function() {
       let grid = GridStack.init(options);
       expect(grid.opts.disableResize).toBe(true);
       let items = Utils.getElements('.grid-stack-item');
-      let dd = DDGridStack.get();
+      let dd = GridStack.getDD();
       // expect(dd).toBe(null); // sanity test to verify type
       for (let i = 0; i < items.length; i++) {
         expect(dd.isResizable(items[i])).toBe(false);
@@ -1499,7 +1499,7 @@ describe('gridstack', function() {
       let grid = GridStack.init(options);
       expect(grid.opts.disableResize).toBeFalsy();
       let items = Utils.getElements('.grid-stack-item');
-      let dd = DDGridStack.get();
+      let dd = GridStack.getDD();
       for (let i = 0; i < items.length; i++) {
         expect(dd.isResizable(items[i])).toBe(true);
         expect(dd.isDraggable(items[i])).toBe(true);
@@ -1527,7 +1527,7 @@ describe('gridstack', function() {
       };
       let grid = GridStack.init(options);
       let items = Utils.getElements('.grid-stack-item');
-      let dd = DDGridStack.get();
+      let dd = GridStack.getDD();
       grid.enableResize(false);
       grid.enableMove(false);
       for (let i = 0; i < items.length; i++) {