[App Config] Update Response Output for Label for Configuration Setting

sdk/appconfiguration/app-configuration/CHANGELOG.md

@@ -2,13 +2,14 @@
 
 ## 1.5.0-beta.3 (Unreleased)
 
-
 ### Features Added
 
 ### Breaking Changes
 
 ### Bugs Fixed
 
+- To match the input type, change the output representation of `label` and `contentType` from `null` to `undefined` when these properties are empty or not defined in the configuration setting object. [#27622](https://github.com/Azure/azure-sdk-for-js/pull/27622)
+
 ### Other Changes
 
 ## 1.5.0-beta.2 (2023-10-10)

sdk/appconfiguration/app-configuration/assets.json

@@ -2,5 +2,5 @@
   "AssetsRepo": "Azure/azure-sdk-assets",
   "AssetsRepoPrefixPath": "js",
   "TagPrefix": "js/appconfiguration/app-configuration",
-  "Tag": "js/appconfiguration/app-configuration_7d75890bc5"
+  "Tag": "js/appconfiguration/app-configuration_0d80770eb3"
 }

sdk/appconfiguration/app-configuration/src/internal/helpers.ts

@@ -227,9 +227,13 @@ export function transformKeyValue<T>(kvp: T & KeyValue): T & ConfigurationSettin
     ...kvp,
     isReadOnly: !!kvp.locked,
   };
-
   delete setting.locked;
-
+  if (!setting.label) {
+    delete setting.label;
+  }
+  if (!setting.contentType) {
+    delete setting.contentType;
+  }
   return setting;
 }
 

sdk/appconfiguration/app-configuration/test/public/index.spec.ts

@@ -1154,7 +1154,7 @@ describe("AppConfigurationClient", () => {
       );
       assert.strictEqual(
         replacedResult.contentType,
-        null,
+        undefined,
         "Unexpected contentType in result from setConfigurationSetting()."
       );
 
@@ -1256,7 +1256,7 @@ describe("AppConfigurationClient", () => {
       );
       assert.strictEqual(
         replacedResult.contentType,
-        null,
+        undefined,
         "Unexpected contentType in result from setConfigurationSetting()."
       );
 
@@ -1300,7 +1300,7 @@ describe("AppConfigurationClient", () => {
       );
       assert.strictEqual(
         result.contentType,
-        null,
+        undefined,
         "Unexpected contentType in result from setConfigurationSetting()."
       );
     });