Vetur: [Typescript] Not getting proper type check/IntelliSense

[darthmeme]

• [x] I have searched through existing issues
• [x] I have read through docs
• [x] I have read FAQ
• [x] I have tried restarting VS Code or running Vetur: Restart VLS

Info

• Platform: macOS
• Vetur version: 0.31.0
• VS Code version: 1.51.1

Problem

When importing a method from a .ts file that returns null or undefined into a Vue component, it seems to lose the null or undefined type when invoked.

When hovering over the import:

It correctly shows that the method returns a string or null

When invoking the function and hovering over it:

It only shows that the method returns a string

Also, this might be related to this issue, but I don't have any type checks against null. This line of code should complain that I'm assigning null to a string, but it doesn't.

Reproducible Case

https://github.com/darthmeme/veturpack-repro

[yoyo930021]

Please use compilerOptions.strict: true in your tsconfig.json.

[darthmeme]

@yoyo930021 hey, thanks for the quick reply! That totally worked for the repo I pushed to show the issue!

On other projects I work on, this was already set in tsconfig.json and still didn't work. But there seems to have been an update pushed yesterday and Vetur threw some issues with not finding certain files (tsconfig and package.json) - was able to fix those from the FAQ link and now everything works flawlessly!