Centralize clientId creation

Summary: One step towards getting away from constructing and destructing clientIds manually everywhere by splitting and joining #'s. Which has been VERY error prone in the past.

Reviewed By: passy

Differential Revision: D18809442

fbshipit-source-id: bd4d89d3eb3d59694aa735b19dbd73d122e59ba0

src/utils/clientUtils.tsx

@@ -47,3 +47,12 @@ export function getCurrentAppName(client: string | undefined | null): string {
     return '';
   }
 }
+
+export function buildClientId(clientInfo: {
+  app: string;
+  os: string;
+  device: string;
+  device_id: string;
+}): string {
+  return `${clientInfo.app}#${clientInfo.os}#${clientInfo.device}#${clientInfo.device_id}`;
+}