feat: apply success stubs to landing content (#33)

src/lib/types.ts

@@ -1,3 +1,11 @@
+/**
+ * @example type Output = ArrElement<['a', 'b', 'c']>;
+ * // "a" | "b" | "c"
+ */
+export type ArrElement<ArrType> = ArrType extends readonly (infer ElementType)[]
+  ? ElementType
+  : never;
+
 /** 
  * @example type Output = Split<'a.b1' | 'a.b2', '.'>;
  * // ["a", "b1"] | ["a", "b2"]