VSCode: schema validation & error reporting

[borekb]

If I make typos and other mistakes in .graphql files, I'd like to get red squiggly lines and errors in the Problems panel.

[JakeDawkins]

Hi! Thanks for opening this. Can you be more specific? I think you're asking for better support for service projects and their schemas? I'll mark this as a duplicate of #1026 but if not, please let me know :)