I don't know about you, but I don't like using Runes with $state in Svelte 5. Sure, they're easier to set data in your component, but I don't write...
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I have an application that has a service.ts with an eventhandler that impacts the store. I cannot use useRune() or any runelike actions in a service file since you can only use runes in components, how can i get the store defined like this to update from an eventhandler?
This is a Svelte 5 limitation. You would need to rename service.ts to service.svelte.ts, generally speaking.
yes, that's true. if you add a
const docState = $state( {value: null} )it will let you do that.
but if you set
const docState = useRune('docstate')it will error out with a Svelte error: lifecycle_outside_component
i dont see a way to circumvent that...
Are you using shared.svelte.ts for the
useRune()? Also, I'm not sure where you're putting that, so an example repo would help.I made 2 thinking errors; first, if you're using a rune in a service.svelte.ts, you don't need a context for children objects to access it. you can simply export const store=$state({}).
Secondly, I got confused while testing because I used a
const store=$state<Map<string,string>>(new Map());which didn't work; not because of contexts as I thought, but because a Map change doesn't seem to trigger a change in svelte. When i used a normal object of type{ [k: string]: string }it worked like a charm.. old javascript habits ...You still want to use context. While it can work, there is a chance it could leak in SSR. See my first post about this and the issue - github.com/sveltejs/kit/discussion....
I agree, I want to :)
But how could I use the useSharedStore in an event handler that's not in a component? If I use
const user = useUser();in my service.svelte.ts it will complain about the lifecycle_outside_component. Would this require a component without any html that you would put in layout.svelte that just holds the event handler? seems weird.If you're getting that error, than you're running
useUser()outside a component. You cannot run it in a load function, or inside a function that is not called directly in a component. See my Svelte 5 Repo for an example.This is the post I have been looking for. Thanks. I am a very part-time programmer and am struggling a little with runes, and sharing state across my app.
I agree with your point about, "should be standard in libraries/frameworks".
but how will you access this inside +layout.ts when running in the browser. Both getContext and setContext throw an error. Use case infinite scrolling. Scroll 3 pages, click on the 31st item. It calls +layout.ts that attempts to navigate to this item which doesnt exist, somehow these items have to be shared between +layout.ts and +layout.svelte
Read my other posts, you shouldn't use context inside
+page.tsor+layout.ts. Context is meant for sharing in components. You can share data in a loader differently by returning the data.