While I tested files of this extension at Visual Studio Code I got this error:
{ "resource": "/c:/Users/Zoran/Desktop/development/MassMessage/package.json", "owner": "_generated_diagnostic_collection_name_#4", "severity": 4, "message": "Incorrect type. Expected \"boolean\".", "startLineNumber": 2, "startColumn": 13, "endLineNumber": 2, "endColumn": 19 }
I made fix per other package.json files. Patch coming 😄