From c19bdfe074e9f07e96c320c34909d95d26fb9070 Mon Sep 17 00:00:00 2001
From: Swopnil Dangol <swopnildangol@gmail.com>
Date: Wed, 13 Aug 2025 17:13:38 +0100
Subject: [PATCH] Passed am empty string as the default value for idempotency
 key prefix when initializing the persistence layer class

---
 .../src/persistence/BasePersistenceLayer.ts   |  4 ++--
 .../persistence/BasePersistenceLayer.test.ts  | 21 +++++++++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/packages/idempotency/src/persistence/BasePersistenceLayer.ts b/packages/idempotency/src/persistence/BasePersistenceLayer.ts
index 55c9e34418..e55e38feae 100644
--- a/packages/idempotency/src/persistence/BasePersistenceLayer.ts
+++ b/packages/idempotency/src/persistence/BasePersistenceLayer.ts
@@ -1,7 +1,7 @@
 import { createHash, type Hash } from 'node:crypto';
 import type { JSONValue } from '@aws-lambda-powertools/commons/types';
-import { LRUCache } from '@aws-lambda-powertools/commons/utils/lru-cache';
 import { getStringFromEnv } from '@aws-lambda-powertools/commons/utils/env';
+import { LRUCache } from '@aws-lambda-powertools/commons/utils/lru-cache';
 import { search } from '@aws-lambda-powertools/jmespath';
 import type { JMESPathParsingOptions } from '@aws-lambda-powertools/jmespath/types';
 import { IdempotencyRecordStatus } from '../constants.js';
@@ -39,7 +39,7 @@ abstract class BasePersistenceLayer implements BasePersistenceLayerInterface {
   public constructor() {
     this.idempotencyKeyPrefix = getStringFromEnv({
       key: 'AWS_LAMBDA_FUNCTION_NAME',
-      errorMessage: 'AWS_LAMBDA_FUNCTION_NAME environment variable is required',
+      defaultValue: '',
     });
   }
 
diff --git a/packages/idempotency/tests/unit/persistence/BasePersistenceLayer.test.ts b/packages/idempotency/tests/unit/persistence/BasePersistenceLayer.test.ts
index acd40bcb99..6344a9246a 100644
--- a/packages/idempotency/tests/unit/persistence/BasePersistenceLayer.test.ts
+++ b/packages/idempotency/tests/unit/persistence/BasePersistenceLayer.test.ts
@@ -63,6 +63,27 @@ describe('Class: BasePersistenceLayer', () => {
         })
       );
     });
+
+    it('initializes with empty key prefix if AWS_LAMBDA_FUNCTION_NAME is not in the environment variable', () => {
+      // Prepare
+      vi.stubEnv('AWS_LAMBDA_FUNCTION_NAME', undefined);
+
+      // Act
+      const persistenceLayer = new PersistenceLayerTestClass();
+
+      // Assess
+      expect(persistenceLayer.idempotencyKeyPrefix).toBe('');
+      expect(persistenceLayer).toEqual(
+        expect.objectContaining({
+          configured: false,
+          expiresAfterSeconds: 3600,
+          hashFunction: 'md5',
+          payloadValidationEnabled: false,
+          throwOnNoIdempotencyKey: false,
+          useLocalCache: false,
+        })
+      );
+    });
   });
 
   describe('Method: configure', () => {