Hoist $store variables to the top scope of the referencing packaged file(s)

[btakita]

A possible solution to #3636

Simply hoist the store value to the top of the packaged file scope. This can be achieved using subscribe & tracking each store variable referenced in a component with a unique name.

import { writable } from 'svelte/store'
let $store
const store = writable()
store.subscribe($ => $store = $)

Hoisting the store value will reduce the amount of subscribers to exported stores in other modules as well.

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Somewhat related, but a design pattern I've used in modules is

import { writable } from 'svelte/store'
export let value
export __value = writable()
__value.subscribe($ => value = $)

I prefix stores with __ because the svelte compiler does not like variables with a $ prefix that it does not manage...

[dummdidumm]

Closing since #3636 was fixed a while ago and it seems that this isse is a suggestion to fix #3636.