start

assets/app.js

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+/*
+ * Welcome to your app's main JavaScript file!
+ *
+ * We recommend including the built version of this JavaScript file
+ * (and its CSS file) in your base layout (base.html.twig).
+ */
+
+// any CSS you import will output into a single css file (app.css in this case)
+import './styles/app.scss';
+
+const $ = require('jquery');
+// this "modifies" the jquery module: adding behavior to it
+// the bootstrap module doesn't export/return anything
+require('bootstrap');
+
+// or you can include specific pieces
+// require('bootstrap/js/dist/tooltip');
+// require('bootstrap/js/dist/popover');
+
+$(document).ready(function() {
+    $('[data-toggle="popover"]').popover();
+});

assets/styles/app.scss

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+$primary: darken(#428bca, 20%);
+
+// the ~ allows you to reference things in node_modules
+@import "~bootstrap/scss/bootstrap";