add regenerator runtime as dependency

package.json

@@ -17,15 +17,14 @@
     "dayjs": "^1.8.14",
     "graphql-yoga": "^1.17.4",
     "jsonwebtoken": "^8.5.1",
-    "mongoose": "^5.5.10"
+    "mongoose": "^5.5.10",
+    "regenerator-runtime": "^0.13.3"
   },
   "devDependencies": {
     "@babel/core": "^7.5.5",
     "@babel/node": "^7.5.5",
     "@babel/preset-env": "^7.5.5",
     "babel-loader": "^8.0.6",
-    "core-js": "^3.1.4",
-    "regenerator-runtime": "^0.13.3",
     "webpack": "^4.28.4",
     "webpack-cli": "^3.0.8",
     "webpack-node-externals": "^1.7.2"

src/index.js

@@ -1,4 +1,3 @@
-import "core-js/stable";
 import "regenerator-runtime/runtime";
 import { GraphQLServer } from 'graphql-yoga';
 

yarn.lock

@@ -730,9 +730,9 @@
   integrity sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw==
 
 "@types/node@*":
-  version "12.7.0"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.7.0.tgz#545dde2a1a5c27d281cfb8308d6736e0708f5d6c"
-  integrity sha512-vqcj1MVm2Sla4PpMfYKh1MyDN4D2f/mPIZD7RdAGqEsbE+JxfeqQHHVbRDQ0Nqn8i73gJa1HQ1Pu3+nH4Q0Yiw==
+  version "12.7.1"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.7.1.tgz#3b5c3a26393c19b400844ac422bd0f631a94d69d"
+  integrity sha512-aK9jxMypeSrhiYofWWBf/T7O+KwaiAHzM4sveCdWPn71lzUSMimRnKzhXDKfKwV1kWoBo2P1aGgaIYGLf9/ljw==
 
 "@types/range-parser@*":
   version "1.2.3"
@@ -1641,7 +1641,7 @@ core-js@^2.5.3, core-js@^2.6.5:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.9.tgz#6b4b214620c834152e179323727fc19741b084f2"
   integrity sha512-HOpZf6eXmnl7la+cUdMnLvUxKNqLUzJvgIziQ0DiF3JwSImNphIqdGqzj6hIKyX04MmV0poclQ7+wjWvxQyR2A==
 
-core-js@^3.0.0, core-js@^3.1.4:
+core-js@^3.0.0:
   version "3.1.4"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.1.4.tgz#3a2837fc48e582e1ae25907afcd6cf03b0cc7a07"
   integrity sha512-YNZN8lt82XIMLnLirj9MhKDFZHalwzzrL9YLt6eb0T5D0EDl4IQ90IGkua8mHbnxNrkj1d8hbdizMc0Qmg1WnQ==