svelte-check reports warning for unary operation with reactive store

[dkzlv]

Describe the bug
svelte-check reports a warning when using unary operation with a reactive store syntax.

To Reproduce
In my case svelte-check wasn't satisfied with this line:

$: show404 = !ent && !$syncStatusStore;

I got the following error:

Warning - unrecognized UnaryExpression operator 53! 
                This is an edge case unaccounted for in svelte2tsx, please file an issue:
                https://github.com/sveltejs/language-tools/issues/new/choose
                 !$syncStatusStore

Expected behavior
No error or warning.

System (please complete the following information):

• OS: Mac OS 10.15.3
• IDE: VS Code
• Plugin/Package: Svelte for VS Code (the new official one)

[dummdidumm]

This is a false positive in this if-clause. !$store is an update-expression, too, but one which does not need special treatment, so the warning is wrong.