Scripts without import/export appear to be duplicated

Playground link

As described by @modderme123 in https://github.com/solidjs/solid-playground/pull/103#issuecomment-1121503818:

This is an issue with files that don't have imports or exports and are then treated as a global script file. One trick might be to add a tsconfig flag to ignore output_dont_import.tsx?

I tried adding an exclude option to languages.typescript.typescriptDefaults.setCompilerOptions (in src/components/editor/setupSolid.ts) but it doesn't seem to fix the problem.

I previously wrote:

It seems that src/components/editor/monacoTabs.tsx's MonacoTabs creates two models: the model at the top of the function and the model for each tab in tabs. I'm seeing the same source code in both the root model and a tab, which is presumably the source of the problem. [...] Could we remove one of the duplicates (presumably the top-level model?)?

Reproduce the duplication from the linked Playground example, then inspect src/components/editor/monacoTabs.tsx and src/components/editor/setupSolid.ts. Start by tracing how the root model and per-tab models are created and how TypeScript treats files without imports or exports. Done means those scripts no longer appear duplicated without breaking tab compilation.