update build to corejs@3

Author: alexcjohnson

dash-renderer/.babelrc

@@ -1,4 +1,6 @@
 {
-    "presets": ["@babel/preset-env", "@babel/preset-react"],
-    "plugins": ["@babel/plugin-proposal-object-rest-spread"]
+    "presets": [["@babel/preset-env", {
+        "useBuiltIns": "usage",
+        "corejs": 3
+        }], "@babel/preset-react"]
 }

dash-renderer/package-lock.json

@@ -36,13 +36,12 @@
   },
   "devDependencies": {
     "@babel/core": "^7.6.0",
-    "@babel/plugin-proposal-object-rest-spread": "^7.5.5",
-    "@babel/polyfill": "^7.6.0",
     "@babel/preset-env": "^7.6.0",
     "@babel/preset-react": "^7.0.0",
     "@svgr/webpack": "^4.1.0",
     "babel-eslint": "^10.0.3",
     "babel-loader": "^8.0.6",
+    "core-js": "3.2.1",
     "css-loader": "^3.2.0",
     "eslint": "^5.15.3",
     "eslint-config-airbnb": "^17.1.0",

dash-renderer/package.json

@@ -8,7 +8,7 @@ const defaultOptions = {
     mode: 'development',
     devtool: 'none',
     entry: {
-        main: ['@babel/polyfill', 'whatwg-fetch', './src/index.js'],
+        main: ['whatwg-fetch', './src/index.js'],
     },
     output: {
         path: path.resolve(__dirname, dashLibraryName),

dash-renderer/webpack.config.js

@@ -3,6 +3,6 @@ const config = require('./webpack.config.js');
 config.entry = {main: './src/demo/index.js'};
 config.output = {filename: 'output.js'};
 config.mode = 'development';
-config.externals = undefined; // eslint-disable-line
+config.externals = undefined;
 config.devtool = 'inline-source-map';
 module.exports = config;