add rollup config to build polyfills

.config/polyfills.js

-import 'core-js/modules/es6.date.to-string';
-import 'core-js/modules/es6.function.name';
-import 'core-js/modules/es6.object.keys';
-import 'core-js/modules/es7.symbol.async-iterator';
-import 'core-js/modules/es6.symbol';
-import 'core-js/modules/es6.string.iterator';
-import 'core-js/modules/es6.set';
-import 'core-js/modules/es6.regexp.match';
-import 'core-js/modules/es7.array.includes';
-import 'core-js/modules/es6.string.includes';
-import 'core-js/modules/es6.array.iterator';
-import 'core-js/modules/es7.object.entries';
-import 'core-js/modules/es6.object.assign';
-import 'core-js/modules/es6.regexp.to-string';
-import 'core-js/modules/es6.regexp.replace';
-import 'core-js/modules/es6.regexp.split';
-import 'core-js/modules/web.dom.iterable';
-import 'core-js/modules/es6.array.find';
+import 'core-js/modules/es6.function.name'
+import 'core-js/modules/es6.object.keys'
+import 'core-js/modules/es6.symbol'
+import 'core-js/modules/es6.set'
+import 'core-js/modules/es7.array.includes'
+import 'core-js/modules/es6.string.includes'
+import 'core-js/modules/es6.array.iterator'
+import 'core-js/modules/es7.object.entries'
+import 'core-js/modules/es6.object.assign'

.config/rollup.polyfills.js

+import { uglify } from "rollup-plugin-uglify"
+import resolve from 'rollup-plugin-node-resolve'
+import commonjs from 'rollup-plugin-commonjs'
+
+export default [
+  {
+    input: './.config/polyfills.js',
+    output: {
+      file: 'dist/polyfills.js',
+      name: 'polyfills',
+      sourceMap: 'external',
+      format: 'iife'
+    },
+    plugins: [
+      resolve({browser: true}),
+      commonjs(),
+      uglify()
+    ]
+  }
+]

package-lock.json

         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",

package.json

     "rollup": "rollup -c .config/rollup.config.js",
     "server": "npx http-server ./ -d",
     "test": "npx karma start .config/karma.conf.js",
-    "test:ci": "karma start .config/karma.conf.saucelabs.js"
+    "test:ci": "karma start .config/karma.conf.saucelabs.js",
+    "server": "npx http-server ./ -d",
+    "build:polyfills": "npx rollup -c .config/rollup.polyfills.js"
   },
   "devDependencies": {
     "@babel/core": "^7.1.2",