Svelte: Component bindings can't access store

[Rich-Harris]

In an app with store support, any component can do this...

<input bind:value=$whatever>

...but this doesn't work:

<Widget bind:x=$y/>

It just sets $y on the parent component, rather than setting y on the store.

[nvioli]

Thanks, @Rich-Harris . Unfortunately this doesn't seem to solve my original issue, that updating the inputs in the child components does not fire the store.onchange handler:
https://stackoverflow.com/questions/48177495/svelte-store-not-firing-onchange-when-nested-components-update (whoops, put the wrong link first, thanks @paulocoghi)
Updated to 1.54.2 and still reproducible here:
https://nonstop-hourglass.glitch.me/

Does store.onchange only watch for changes to top-level elements? Is that by design? If so it seems that the workaround you suggested on SO would always be necessary?

[paulocoghi]

@nvioli , you posted a different SO question. I believe that the question is:

https://stackoverflow.com/questions/48177495/svelte-store-not-firing-onchange-when-nested-components-update

[paulocoghi]

Anyway, the issue is well reported. :)

[Rich-Harris]

Fixed (again! hopefully for good) in 1.55 — thanks

[mjarkk]

This doesn't seems to be fixed yet, i have 3 files:
store.js

export const windowWidth = writable(1000);

2.svelte

<svelte:window bind:innerWidth={$windowWidth} />
<p>{$windowWidth}</p>

3.svelte

<p>{$windowWidth}</p>

But when i change the window size the value in 3.svelte doesn't update at all and in 2.svelte it does.

I'm working in a sapper project that has svelte version: "svelte": "^3.0.0",

A temperately solution seems to be this:
2.svelte

<svelte:window on:resize={() => ($windowWidth = window.innerWidth)} />

In the script tag of 2.svelte

onMount(() => ($windowWidth = window.innerWidth));

[Rich-Harris]

Found this as an unclosed item on the project page, and just leaving a note to self — it looks like the issue in the last comment was fixed at some point: https://svelte.dev/repl/4c0e43f14ddb4232addc784d35e03baf?version=3.22.2