chore(build): update polyfilling with core-js

Author: GertSallaerts

js/babel.config.js

@@ -10,14 +10,18 @@ module.exports = api => {
       '@babel/plugin-proposal-class-properties',
       '@babel/plugin-proposal-export-namespace-from',
       '@babel/plugin-proposal-export-default-from',
-      'add-module-exports'
+      'add-module-exports',
+      [
+        'polyfill-corejs3',
+        {
+          method: 'usage-pure'
+        }
+      ]
     ],
     presets: [
       [
         '@babel/preset-env',
         {
-          useBuiltIns: 'usage',
-          corejs: 2,
           modules: api.env('commonjs') || api.env('test') ? 'commonjs' : false,
           forceAllTransforms: api.env('production')
         }

js/package.json

@@ -26,6 +26,7 @@
     "@babel/preset-env": "^7.4.0",
     "babel-eslint": "^10.0.1",
     "babel-plugin-add-module-exports": "^1.0.2",
+    "babel-plugin-polyfill-corejs3": "^0.3.0",
     "eslint": "^4.18.1",
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-prettier": "^2.6.0",
@@ -57,7 +58,7 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.3.1",
-    "core-js": "^2.5.0",
+    "core-js-pure": "^3.19.0",
     "punycode": "1.4.1",
     "twemoji-parser": "^11.0.2"
   }