Port settings.

src/lib/conversion.ts

@@ -0,0 +1,9 @@
+export function urlBase64ToUint8Array(base64String: string) {
+    const padding = "=".repeat((4 - (base64String.length % 4)) % 4);
+    const base64 = (base64String + padding)
+        .replace(/\-/g, "+")
+        .replace(/_/g, "/");
+    const rawData = window.atob(base64);
+
+    return Uint8Array.from([...rawData].map(char => char.charCodeAt(0)));
+}