tsgo does not detect unreachable code

[Kumneger0]

Reproduction Steps

1. Follow the setup instructions from this blog post to enable tsgo in VSCode(if you haven't already):
   https://devblogs.microsoft.com/typescript/announcing-typescript-native-previews/

2. Create a .ts file and add the following code:

   function doSomethingAwesome() {
     throw new Error("we messed up");
     return [];
   }

Expected Behavior

The return statement should be reported as unreachable when it follows a throw

Actual Behavior

No unreachable code warning is shown.

Environment

• @typescript/native-preview version: 7.0.0-dev.20250525.1
• Node.js version: v20.18.2
• OS: Ubuntu 24.04 (if applicable)

[jakebailey]

I think it does detect the unreachable code, it's just that the diagnostics code isn't setting that info on its response.

[jakebailey]

Hah, no, we're missing a bunch of related diagnostic stuff.