From c96c96b61ac76b0ca78b36e8981089b924662fba Mon Sep 17 00:00:00 2001
From: Copilot <223556219+Copilot@users.noreply.github.com>
Date: Sun, 22 Mar 2026 08:37:08 +0000
Subject: [PATCH] fix: preserve error cause in getHostAddress() for better
 debugging

The getHostAddress() method in DurableTaskAzureManagedClientOptions drops the
original URL parsing error when re-throwing, making it difficult to debug why
a specific endpoint URL is invalid. This change preserves the original error
as the cause property of the new Error.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .../durabletask-js-azuremanaged/src/options.ts  |  4 ++--
 .../test/unit/options.spec.ts                   | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/packages/durabletask-js-azuremanaged/src/options.ts b/packages/durabletask-js-azuremanaged/src/options.ts
index 30f9c556..e60279ba 100644
--- a/packages/durabletask-js-azuremanaged/src/options.ts
+++ b/packages/durabletask-js-azuremanaged/src/options.ts
@@ -101,8 +101,8 @@ abstract class DurableTaskAzureManagedOptionsBase {
         authority = `${authority}:${url.port}`;
       }
       return authority;
-    } catch {
-      throw new Error(`Invalid endpoint URL: ${endpoint}`);
+    } catch (e) {
+      throw new Error(`Invalid endpoint URL: ${endpoint}`, { cause: e });
     }
   }
 
diff --git a/packages/durabletask-js-azuremanaged/test/unit/options.spec.ts b/packages/durabletask-js-azuremanaged/test/unit/options.spec.ts
index d0f6c7cb..90b20b6f 100644
--- a/packages/durabletask-js-azuremanaged/test/unit/options.spec.ts
+++ b/packages/durabletask-js-azuremanaged/test/unit/options.spec.ts
@@ -158,6 +158,23 @@ describe("Options", () => {
 
         expect(() => options.getHostAddress()).toThrow("Invalid endpoint URL:");
       });
+
+      it("should preserve the original error as cause when URL parsing fails", () => {
+        const options = new DurableTaskAzureManagedClientOptions().setEndpointAddress("invalid:url");
+
+        try {
+          options.getHostAddress();
+          fail("Expected getHostAddress to throw");
+        } catch (e: unknown) {
+          expect(e).toBeInstanceOf(Error);
+          const error = e as Error;
+          expect(error.message).toContain("Invalid endpoint URL:");
+          expect(error.cause).toBeDefined();
+          // The cause should be the original URL parsing error
+          expect((error.cause as Error).message).toBeDefined();
+          expect((error.cause as Error).message.length).toBeGreaterThan(0);
+        }
+      });
     });
 
     describe("createChannelCredentials", () => {