Fix Saga pattern to only compensate in case of a Terminal Error

Author: StephanEwen

patterns-use-cases/sagas/sagas-typescript/src/workflow_saga.ts

@@ -60,18 +60,16 @@ export default async (ctx: restate.Context, tripID: string) => {
     //
     await flights.confirm(tripID, flightBooking);
     await cars.confirm(tripID, carBooking);
-  } catch (e: any) {
-    // undo all the steps up to this point by running the compensations
-    for (const compensation of compensations.reverse()) {
-      await compensation();
-    }
+    
+  } catch (e) {
 
-    // exit with an error
-    throw new restate.TerminalError(
-      `Travel reservation failed with an error: ${e.message}`,
-      {
-        cause: e,
+    if (e instanceof restate.TerminalError) {
+      // undo all the steps up to this point by running the compensations
+      for (const compensation of compensations.reverse()) {
+        await compensation();
       }
-    );
+    }
+
+    throw e;
   }
 };