I published another extension for your SharePoint Framework solution to check your scripts and correctly reference the external JavaScript libraries in your solutions.
The extension is powered by the same APIs of the SharePoint Framework Script Check that was built by Waldek Mastykarz from Rencore.
Check out the VSCode extension: SPFx Script Check
Feedback and issues
If you have feedback or ideas that you want to see included in this extension, feel free to send in an issue on my GitHub repository: issue list.