Add support for dynamic imports (#43716)

Author: joshdover

packages/kbn-babel-preset/package.json

@@ -5,8 +5,9 @@
   "license": "Apache-2.0",
   "dependencies": {
     "@babel/plugin-proposal-class-properties": "7.4.4",
-    "@babel/preset-react":"7.0.0",
+    "@babel/plugin-syntax-dynamic-import": "^7.2.0",
     "@babel/preset-env": "7.4.5",
+    "@babel/preset-react": "7.0.0",
     "@babel/preset-typescript": "7.3.3",
     "@kbn/elastic-idx": "1.0.0",
     "babel-plugin-add-module-exports": "1.0.2",

packages/kbn-babel-preset/webpack_preset.js

@@ -29,6 +29,9 @@ module.exports = () => {
         },
       ],
       require('./common_preset'),
+    ],
+    plugins: [
+      '@babel/plugin-syntax-dynamic-import'
     ]
   };
 };