Create register-sw.js

public/register-sw.js

@@ -0,0 +1,30 @@
+"use strict";
+/**
+ * Distributed with Ultraviolet and compatible with most configurations.
+ */
+const stockSW = "/uv/sw.js";
+
+/**
+ * List of hostnames that are allowed to run serviceworkers on http:
+ */
+const swAllowedHostnames = ["localhost", "127.0.0.1"];
+
+/**
+ * Global util
+ * Used in 404.html and index.html
+ */
+async function registerSW() {
+  if (
+    location.protocol !== "https:" &&
+    !swAllowedHostnames.includes(location.hostname)
+  )
+    throw new Error("Service workers cannot be registered without https.");
+
+  if (!navigator.serviceWorker)
+    throw new Error("Your browser doesn't support service workers.");
+
+  // Ultraviolet has a stock `sw.js` script.
+  await navigator.serviceWorker.register(stockSW, {
+    scope: __uv$config.prefix,
+  });
+}