Update packages/core/src/exports.ts

Co-authored-by: Lukas Stracke <lukas.stracke@sentry.io>

Author: andreiborza

packages/core/src/exports.ts

@@ -121,7 +121,14 @@ export function setUser(user: User | null): void {
 }
 
 /**
- * The last event id of the isolation scope.
+ * The last error event id of the isolation scope.
+ *
+ * Warning: This function really returns the last recorded error event id on the current 
+ * isolation scope.  If you call this function after handling a certain error and another error 
+ * is captured in between, the last one is returned instead of the one you might expect. 
+ * Also, ids of events that were never sent to Sentry (for example because 
+ * they were dropped in `beforeSend`) could be returned.
+ *
  * @returns The last event id of the isolation scope.
  */
 export function lastEventId(): string | undefined {