support comment in json key value

Author: zhiyuanliang-ms

package-lock.json

@@ -57,6 +57,7 @@
   "dependencies": {
     "@azure/app-configuration": "^1.6.1",
     "@azure/identity": "^4.2.1",
-    "@azure/keyvault-secrets": "^4.7.0"
+    "@azure/keyvault-secrets": "^4.7.0",
+    "jsonc-parser": "^3.3.1"
   }
 }

package.json

@@ -11,6 +11,7 @@ export default [
       "@azure/identity",
       "crypto",
       "dns/promises",
+      "jsonc-parser",
       "@microsoft/feature-management"
     ],
     input: "src/index.ts",

rollup.config.mjs

@@ -2,6 +2,7 @@
 // Licensed under the MIT license.
 
 import { ConfigurationSetting, featureFlagContentType, secretReferenceContentType } from "@azure/app-configuration";
+import { stripComments } from "jsonc-parser";
 import { parseContentType, isJsonContentType } from "./common/contentType.js";
 import { IKeyValueAdapter } from "./IKeyValueAdapter.js";
 
@@ -26,9 +27,18 @@ export class JsonKeyValueAdapter implements IKeyValueAdapter {
         let parsedValue: unknown;
         if (setting.value !== undefined) {
             try {
-                parsedValue = JSON.parse(setting.value);
+                let cleanJsonValue = setting.value;
+                if (setting.value) {
+                    cleanJsonValue = stripComments(setting.value);
+                }
+                parsedValue = JSON.parse(cleanJsonValue);
             } catch (error) {
-                parsedValue = setting.value;
+                if (error instanceof SyntaxError) {
+                    parsedValue = setting.value;
+                } else {
+                    // If the error is not a SyntaxError, rethrow it
+                    throw error;
+                }
             }
         } else {
             parsedValue = setting.value;