Moved code into src folder. Added build for component library.

src/lib/crypto.js

@@ -0,0 +1,23 @@
+import { startOfMonth } from 'date-fns';
+import { hash } from 'next-basics';
+import { v4, v5, validate } from 'uuid';
+
+export function secret() {
+  return hash(process.env.APP_SECRET || process.env.DATABASE_URL);
+}
+
+export function salt() {
+  const ROTATING_SALT = hash(startOfMonth(new Date()).toUTCString());
+
+  return hash(secret(), ROTATING_SALT);
+}
+
+export function uuid(...args) {
+  if (!args.length) return v4();
+
+  return v5(hash(...args), v5.DNS);
+}
+
+export function isUuid(value) {
+  return validate(value);
+}