more logging

Author: nhsd-david-wass

lambdas/upsert-letter/src/handler/upsert-handler.ts

@@ -114,7 +114,13 @@ function mapToUpdateLetter(upsertRequest: LetterEvent): UpdateLetter {
 function getType(event: unknown) {
   const env = TypeEnvelope.safeParse(event);
   if (!env.success) {
-    throw new Error("Missing or invalid envelope.type field");
+    // Helpful debugging info:
+    const pretty = (() => {
+      return JSON.stringify(event, null, 2);
+    })();
+    throw new Error(
+      `Missing or invalid envelope.type field. Payload seen:\n${pretty}`,
+    );
   }
   return env.data.type;
 }