preloading

src/js/swup.js

@@ -0,0 +1,11 @@
+import Swup from 'swup'
+import SwupPreloadPlugin from '@swup/preload-plugin';
+
+export default (fn) => {
+    const swup = new Swup({
+        plugins: [new SwupPreloadPlugin()],
+        containers: ['#app']
+    })
+
+    swup.on('contentReplaced', fn)
+}