Open a .tsx file in a solidjs project (probably any non-react project) and observe all JSX syntax triggers a typescript error masking other potential ts errors.

A SolidJS project without a properly configured tsconfig.json, right? tsc would report the same error.

Great question, I was wondering how I would narrow this down. I have something like a mono-repo where I point vscode to the root and vscode is smart enough to scan and pickup all the sub-projects directly in that folder (big help). In the case above, that folder does have a tsconfig.json as follows. Other projects use pnpm link to reference that project so they have "ipweb": "link:../ipweb" in their package.json.

{
  "compilerOptions": {
    "allowJs": true,
    "checkJs": true,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "target": "ESNext",
    "module": "ESNext",
    "moduleResolution": "node",
    "jsxImportSource": "solid-js",
    "jsx": "preserve",
    "strictNullChecks": true,
    "exactOptionalPropertyTypes": true,
    "allowImportingTsExtensions": true,
    "noEmit": true,
    "baseUrl": "./",
    "paths": {
      "ipweb/*": ["*"]
    }
  },
  "exclude": [".archive", "**/.archive/*"],
  "include": ["src", "server", "./vite-env.d.ts"]
}

After my testing above (upgrading and downgrading), I eventually opened more files from a referencing project and the issue did not appear. So, I was able to upgrade back up to vscode 1.100 and so far so good. I'm not sure how to recreate it. It just has a mind of its own and shows up from time to time. It has been rare until the other day when TS Restarts and VCode restarts did not fix it (so I though I should document it here). I'm not sure what fixed or caused it.