Feat/BOOK-424 campaign banner

Approved-by: Bianca Widstam

packages/trpc/lib/routers/contentstack/base/utils.ts

@@ -12,6 +12,7 @@ import type { NodeRefs } from "../../../types/refs"
 import type {
   AlertOutput,
   GetSiteConfigRefData,
+  GetSitewideCampaignBannerRefData,
 } from "../../../types/siteConfig"
 import type { System } from "../schemas/system"
 import type { ContactConfig } from "./output"
@@ -138,3 +139,21 @@ export const safeUnion = <T extends z.ZodTypeAny>(schema: T) =>
       return null
     }
   }, schema)
+
+export function getSitewideCampaignBannerConnections(
+  refs: GetSitewideCampaignBannerRefData
+) {
+  const system = refs.all_sitewide_campaign_banner?.system
+  const banner =
+    refs.all_sitewide_campaign_banner?.bannerConnection.edges[0]?.node
+  const connections: System["system"][] = []
+
+  if (system) {
+    connections.push(system)
+  }
+  if (banner?.system) {
+    connections.push(banner.system)
+  }
+
+  return connections
+}