reduce babel (#48)

package.json

@@ -22,7 +22,7 @@
     "url": "git+https://github.com/Microsoft/PowerBI-visuals-linedotchart.git"
   },
   "dependencies": {
-    "@babel/polyfill": "^7.0.0",
+    "core-js": "^3.1.4",
     "d3": "^5.4.0",
     "lodash": "4.17.12",
     "powerbi-models": "1.0.12",

src/visual.ts

@@ -26,7 +26,6 @@
 
 import "./../style/lineDotChart.less";
 
-import "@babel/polyfill";
 import * as d3 from "d3";
 import * as _ from "lodash";
 import powerbi from "powerbi-visuals-api";
@@ -189,6 +188,10 @@ export class LineDotChart implements IVisual {
     private colorHelper: ColorHelper;
 
     constructor(options: VisualConstructorOptions) {
+        if (window.location !== window.parent.location) {
+            require("core-js/stable");
+        }
+
         this.tooltipServiceWrapper = createTooltipServiceWrapper(
             options.host.tooltipService,
             options.element