changes tsconfig

tsconfig.json

@@ -5,7 +5,6 @@
     "outDir": "./dist/out-tsc",
     "sourceMap": true,
     "declaration": false,
-    "module": "es2015",
     "moduleResolution": "node",
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
@@ -14,7 +13,7 @@
       "node_modules/@types"
     ],
     "lib": [
-      "es2018",
+      "es2017",
       "dom"
     ]
   }