Initial open-source self-hosted Songs2YT edition

lib/edition.ts

@@ -0,0 +1,9 @@
+import { Plan } from "@prisma/client";
+
+export function isSelfHostedEdition(): boolean {
+  return process.env.S2YT_EDITION === "selfhosted";
+}
+
+export function hasProFeatures(plan: Plan): boolean {
+  return isSelfHostedEdition() || plan === "PREMIUM";
+}