lovely. got a couple of partial implementations....

src/utilities.ts

@@ -0,0 +1,15 @@
+export const splitAt = (subject: string, index: number): readonly [string, string] => {
+    if (index < 0) {
+        return [subject, ''];
+    }
+
+    if (index > subject.length) {
+        return [subject, ''];
+    }
+
+    return [subject.slice(0, index), subject.slice(index + 1)];
+};
+
+export const toSlug = (subject: string) => {
+    return subject.toLowerCase().replaceAll(' ', '-');
+};