remove polyfill from src

.babelrc

@@ -6,5 +6,14 @@
       }
     }],
     "stage-1"
-  ]
+  ],
+  "plugins": [
+    [
+      "transform-runtime",
+      {
+        "polyfill": false,
+        "regenerator": true
+      }
+    ]
+   ]
 }

package.json

@@ -24,13 +24,14 @@
   },
   "dependencies": {
     "@types/jest": "^23.3.1",
-    "babel-polyfill": "^6.26.0",
+    "babel-runtime": "^6.26.0",
     "eosjs-ecc": "^4.0.1",
     "text-encoding": "^0.6.4"
   },
   "devDependencies": {
     "@types/node": "^10.3.1",
     "babel-cli": "^6.26.0",
+    "babel-plugin-transform-runtime": "^6.23.0",
     "babel-preset-env": "^1.7.0",
     "babel-preset-stage-1": "^6.24.1",
     "jest": "^23.5.0",

src/index.ts

@@ -1,4 +1,3 @@
-import "babel-polyfill";
 import Api from "./eosjs-api";
 import * as ApiInterfaces from "./eosjs-api-interfaces";
 import JsonRpc from "./eosjs-jsonrpc";