fix(babel): added corejs version

StephanGerbeth · StephanGerbeth · commit defb1477de6a · 2019-08-03T14:06:54.000+02:00
diff --git a/.babelrc b/.babelrc
@@ -2,15 +2,27 @@
   "env": {
     "development": {
       "presets": [
-        "@babel/preset-env"
+        [
+          "@babel/preset-env",
+          {
+            "corejs": "2",
+            "useBuiltIns": "usage"
+          }
+        ]
       ],
       "plugins": [
         "istanbul"
       ]
     },
     "production": {
       "presets": [
-        "@babel/preset-env",
+        [
+          "@babel/preset-env",
+          {
+            "corejs": "2",
+            "useBuiltIns": "usage"
+          }
+        ],
         "minify"
       ],
       "plugins": [
