Fix start command. Closes #248

Author: garrytrinder

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 > **Note**: odd version numbers, for example, `0.13.0`, are not included in this changelog. They are used to test the new features and fixes before the final release.
 
-## [0.22.0] - 2025-05-01
+## [0.22.1] - 2025-05-02
 
 ### Added:
 
@@ -20,6 +20,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Snippets: Updated all snippets to use `v0.27.0` schema
 
+### Fixed:
+
+- Command: Using `dev-proxy-toolkit.start` would throw an error when active file is not a Dev Proxy config file
+
 ## [0.20.0] - 2025-04-01
 
 ### Added:

src/helpers.ts

@@ -47,6 +47,11 @@ export const getStartPositionFromASTNode = (
 export const isConfigFile = (document: vscode.TextDocument) => {
   let isConfigFile = false;
 
+  const fileName = document.fileName.toLowerCase();
+  if (!(fileName.endsWith('.json') || fileName.endsWith('.jsonc'))) {
+    return false;
+  }
+
   const documentNode = parse(document.getText()) as parse.ObjectNode;
 
   // we know that its a config file if