[BUG]: Error thrown when parsing JSON config file for C# extension

[tylervz]

Describe the bug

When opening any VS Code workspace, the Output tab shows the following error because the extension failed to parse a JSON config file of the C# extension:

["ERROR" - 3:04:20 PM] Error: Failed to parse a required JSON file: "/Users/myusername/.vscode/extensions/ms-dotnettools.csharp-2.130.5-darwin-x64/src/xaml/language-configuration.json"

	Parse Errors:

	Error 1 - Value Expected at "/Users/myusername/.vscode/extensions/ms-dotnettools.csharp-2.130.5-darwin-x64/src/xaml/language-configuration.json:70:3"

	Stack Trace:
	at Object.readJsonFile (/Users/myusername/.vscode/extensions/ycodetech.automatic-comment-blocks-1.1.14/out/src/utils.js:49:23)
	at /Users/myusername/.vscode/extensions/ycodetech.automatic-comment-blocks-1.1.14/out/src/configuration.js:337:36
	at Array.forEach (<anonymous>)
	at /Users/myusername/.vscode/extensions/ycodetech.automatic-comment-blocks-1.1.14/out/src/configuration.js:336:19
	at Map.forEach (<anonymous>)
	at Configuration.setLanguageConfigDefinitions (/Users/myusername/.vscode/extensions/ycodetech.automatic-comment-blocks-1.1.14/out/src/configuration.js:334:38)
	at new Configuration (/Users/myusername/.vscode/extensions/ycodetech.automatic-comment-blocks-1.1.14/out/src/configuration.js:71:14)
	at Object.<anonymous> (/Users/myusername/.vscode/extensions/ycodetech.automatic-comment-blocks-1.1.14/out/src/extension.js:13:21)
	at Module._compile (node:internal/modules/cjs/loader:1713:14)
	at Module._extensions..js (node:internal/modules/cjs/loader:1847:10)
	at Module.load (node:internal/modules/cjs/loader:1448:32)
	at Module._load (node:internal/modules/cjs/loader:1270:12)
	at c._load (node:electron/js2c/node_init:2:18041)
	at r._load (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:801:6589)
	at e._load (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:619:28611)
	at n._load (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:611:27731)
	at TracingChannel.traceSync (node:diagnostics_channel:328:14)
	at wrapModuleLoad (node:internal/modules/cjs/loader:244:24)
	at Module.require (node:internal/modules/cjs/loader:1470:12)
	at require (node:internal/modules/helpers:147:16)
	at Pk._doLoadModule (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:650:1614)

Here is the content of /Users/myusername/.vscode/extensions/ms-dotnettools.csharp-2.130.5-darwin-x64/src/xaml/language-configuration.json:

{
	"comments": {
		"blockComment": [ "<!--", "-->" ]
	},
  "brackets": [
    [ "<!--", "-->" ],
    [ "<", ">" ],
    [ "{", "}" ],
    [ "(", ")" ]
  ],
  "autoClosingPairs": [
    {
      "open": "{",
      "close": "}"
    },
    {
      "open": "[",
      "close": "]"
    },
    {
      "open": "(",
      "close": ")"
    },
    {
      "open": "\"",
      "close": "\"",
      "notIn": [ "string" ]
    },
    {
      "open": "'",
      "close": "'",
      "notIn": [ "string" ]
    },
    {
      "open": "<!--",
      "close": "-->",
      "notIn": [ "comment", "string" ]
    }
  ],
	"surroundingPairs": [
		{ "open": "'", "close": "'" },
		{ "open": "\"", "close": "\"" },
		{ "open": "{", "close": "}"}
	],
	"colorizedBracketPairs": [
	],
	"folding": {
		"markers": {
			"start": "^\\s*<!--\\s*#region\\b.*-->",
			"end": "^\\s*<!--\\s*#endregion\\b.*-->"
		}
	},
	"wordPattern": {
		"pattern": "(-?\\d*\\.\\d\\w*)|([^\\`\\~\\!\\@\\#\\$\\%\\^\\&\\*\\(\\)\\=\\+\\[\\{\\]\\}\\\\\\|\\;\\:\\'\\\"\\,\\.\\<\\>\\/\\?\\s]+)"
	},
  "onEnterRules": [
    {
      "beforeText": "^\\s*(<([A-Za-z0-9_.-]+)([^/>]*(?!/)>)[^<]*)(?!.*<\\/\\2>)$",
      "afterText": "^\\s*<\\/([A-Za-z0-9_.-]+)[^>]*>$",
      "action": {
        "indent": "indentOutdent"
      }
    },
    {
      "beforeText": "^\\s*(<([A-Za-z0-9_.-]+)[^</]*)$",
      "action": {
        "indent": "indent"
      }
    },
  ]
}

The trailing comment after the last object in the onEnterRules array is what is tripping up ycodetech.automatic-comment-blocks-1.1.14/out/src/utils.js and causing the error to be thrown. Although having a trailing comma in a JSON array is not valid JSON, the language-configuration.json in the source repository of the C# Visual Studio Code extension contains a trailing comma, and so I think this extension needs to support reading JSON with trailing commas.

As a workaround, I can manually open up the /Users/myusername/.vscode/extensions/ms-dotnettools.csharp-2.130.5-darwin-x64/src/xaml/language-configuration.json file on my computer and remove that trailing comma. However, eventually, the comma and the error return; I think this happens when the C# extension updates.

Expected behavior
This plugin should not throw any errors when opening a VS Code workspace, even if the user has the C# Visual Studio Code extension installed.

Additional context
Automatic Comment Blocks version 1.1.16
C# Extension version 2.140.9
.NET Install Tool extension version 3.1.0
VS Code Version: 1.129.0 (Universal)
Commit: 125df4672b8a6a34975303c6b0baa124e560a4f7
Date: 2026-07-15T00:08:44Z (3 days ago)
Electron: 42.6.0
ElectronBuildId: 14623276
Chromium: 148.0.7778.280
Node.js: 24.18.0
V8: 14.8.178.38-electron.0
OS: Darwin x64 24.6.0

Here's the latest Output:
auto-comment-blocks-output.txt. My apologies if this file doesn't match the contents of my bug report exactly. I originally opened the same issue](kevb34ns#47) in the parent repository and then today I realized I actually have your fork of the extension installed.

I discovered that this issue was resolved when I upgraded the Node dependencies of that parent plugin: kevb34ns#48

Please let me know if you'd like me to make a similar pull request for this repository.