build bootstrap in esm

js/index.umd.js

@@ -0,0 +1,32 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v4.3.1): index.umd.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+import Alert from './src/alert'
+import Button from './src/button'
+import Carousel from './src/carousel'
+import Collapse from './src/collapse'
+import Dropdown from './src/dropdown'
+import Modal from './src/modal'
+import Popover from './src/popover'
+import ScrollSpy from './src/scrollspy'
+import Tab from './src/tab'
+import Toast from './src/toast'
+import Tooltip from './src/tooltip'
+
+export default {
+  Alert,
+  Button,
+  Carousel,
+  Collapse,
+  Dropdown,
+  Modal,
+  Popover,
+  ScrollSpy,
+  Tab,
+  Toast,
+  Tooltip
+}