exclamation marks in property declarations aren't parsed

[muhajirdev]

Version

3.0.0-beta.6

Reproduction link

https://jsfiddle.net/50wL7mdz/165908/

Steps to reproduce

Create new vue project with typescript, eslint prettier

open app.vue

What is expected?

Got linting error in vscode

 '=' expected.
 Expression expected.
 Member 'string' implicitly has an 'any' type.

What is actually happening?

There's error messages

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Same issue here prettier/prettier#3561

[defnorep]

Does this really qualify as a reproduction link? It's displaying the code used and your reported error, which is being emitted from TypeScript. A repository would be much more helpful because then we can clone that down, inspect your dependencies, and how you have them configured.

[elevatebart]

I have the same issue as @muhajirframe when I display HelloWorld.vue in vscode.
When I tried jarn serve everything was actually peachy. TypeScript was happy.

Two things can be happening here:

• The definite assignments are a TS 2.7 feature. Therefore, try updating your typescript glogal version (yarn global add typescript or npm i -g typescript). It should bump up the global parser you are using and fix compilation issues if you have some.
• If, like me, you are using Vetur in vscode, I do not think they have updated the version of the parser they use for typescript. In which case we should probably report this issue to them.

with Vetur

## Same code out of Vetur

[elevatebart]

@LinusBorg I finally got around to create a reproduction repo
https://github.com/elevatebart/reprovuecli953
Should I already post this to vetur ?

[elevatebart]

I posted the issue on vetur and they answered promptly.
To me, the case is closed. @muhajirframe ?

[muhajirdev]

The issue seems will be fixed on next release 👍.
Btw thanks for reproducing and reporting to vetur @elevatebart .