explicit IE11 support drop

#1389
explicit drop for IE11 and no longer compile polyfill
(size increase and still issue don't ewarrant such a obsolete support - use 1.x instead).

Author: adumesny

README.md

@@ -382,6 +382,8 @@ v2.x is a Typescript rewrite of 1.x, removing all jquery events, using classes a
 
 3. `oneColumnMode` would trigger when `window.width` < 768px by default. We now check for grid width instead (more correct and supports nesting). You might need to adjust grid `minWidth` or `disableOneColumnMode`.
 
+**Note:** 2.x no longer support legacy IE11 and older due to using more compact ES6 output and typecsript native code. You will need to stay at 1.x
+
 Changes
 =====
 

doc/CHANGES.md

@@ -63,6 +63,7 @@ You can now have perfect square cells (default) [723](https://github.com/gridsta
 - fix [1299](https://github.com/gridstack/gridstack.js/pull/1299) many columns round-off error
 - fix [1102](https://github.com/gridstack/gridstack.js/issues/1102) loose functionality when they are moved to a new grid
 - add optional params to `removeWidget()` to have quiet mode (no callbacks)
+- drop support for IE11 due to more compact ES6 output and newer TS code
 
 ## 1.2.1 (2020-09-04)
 

src/index-html5.ts

@@ -1,6 +1,6 @@
 // index.html5.ts 2.0.1-dev - everything you need for a Grid that uses HTML5 native drag&drop (work in progress) @preserve
 
-import './gridstack-poly.js';
+// import './gridstack-poly.js';
 
 export * from './types';
 export * from './utils';

src/index-jq.ts

@@ -1,6 +1,6 @@
 // index.jq.ts 2.0.1-dev - everything you need for a Grid that uses Jquery-ui drag&drop (original, full feature) @preserve
 
-import './gridstack-poly.js';
+// import './gridstack-poly.js';
 
 export * from './types';
 export * from './utils';

src/index-static.ts

@@ -1,6 +1,6 @@
 // index.static.ts 2.0.1-dev - everything you need for a static Grid (non draggable) @preserve
 
-import './gridstack-poly.js';
+// import './gridstack-poly.js';
 
 export * from './types';
 export * from './utils';

tsconfig.json

@@ -15,7 +15,7 @@
     "outDir": "./dist",
     "sourceMap": true,
     "strict": false,
-    "target": "ES5"
+    "target": "ES6"
   }, 
   "exclude": [
     "./src/**/*.spec.ts",