visual studio code – VSCode: Doesn’t show inline TypeScript errors in my Next.js project until build time

I have a Next.js app and I can’t get VSCode to show inline TypeScript errors (like unused variables or invalid types) while coding. Errors only appear when I run a build (npx tsc or next build).

For example:

No problems shown

Errors are in my code, but not visible right away

A few observations and screenshots from my setup:

Built-in is enabled:
Built-in is enabled

VS Code is reporting ‘partial mode:
Partial mode shown

Project root tsconfig:
Project root tsconfig

Really at a loss here as to how to fix this. Thank you

Things I tried:
Restarted VSCode / Mac
Asked Copilot to check my TS config
Restarted TS Server
Disabled/Re-eneabled @built-in
Searched settings for anything relevant

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