Support $ autosubscription syntax (store references)

[tomblachut]

~I've been thinking about that for a bit now and finally asked JB for input.~

~Basically I see 2 approaches here:~

~1. Extend JS language/parser (and also TS ones). Turns out this is insanely over-complicated because there are edge-cases in Svelte 😉 Svelte handles this after parsing step because it doesn't need to care about editing features. (See #46)

2. Monkey-patch this on top of JS identifiers/references. I still don't know how to handle types but hey, TS is not supported anyway yet.~

https://intellij-support.jetbrains.com/hc/en-us/community/posts/360004377420-Treat-part-of-JS-identifier-specially-depending-on-context

I guess preliminary type-unsafe support will be easy enough.

(also, related docs: http://www.jetbrains.org/intellij/sdk/docs/reference_guide/custom_language_support/rename_refactoring.html)

[unlocomqx]

I gave it a shot in my "reactive" branch. it's not so great but it could be helpful https://github.com/unlocomqx/svelte-intellij/tree/reactive

• it links the $ prefixed expression with the "original" expression
• it provides completion by ignoring the $ prefix I couldn't find a way to provide a type yet, I also didn't test the rename feature

[tomblachut]

Thx! I'll give it a spin

[today-]

Great job on last update. Now $stores are reconginzing and highlighting by IDE.

But TS-types are incorrent, now they show Store's type, not the value istelf.

I tried to evaluate Type from .subscribe() method as Svelte do and created such snippet

type Unsubscriber<T extends {subscribe: any}> = T['subscribe'] extends ((v: infer S) => any) ?
  (S extends (v: infer V) => any ? V : never) : never;

type StoredValue = Unsubscriber<typeof store>;

[tomblachut]

@today- Current implementation is pretty stupid unfortunately

find usages action also don't find them properly

[tomblachut]

There's progress