Subscribe to any unknown store change

Hi. Is there a way to subscribe to a store change in unknown property? I have a store:

type StoreValue = Record<string, number>;

 const [store, setStore] = createStore<StoreValue>({
    a: 0,
    b: 0,
  });

type StoreValue = Record<string, number>;

 const [store, setStore] = createStore<StoreValue>({
    a: 0,
    b: 0,
  });

And sometimes I modify it

      <button type="button" onClick={() => setStore("a", undefined)}>
        setStore("a", undefined)
      </button>

      <button type="button" onClick={() => setStore("a", undefined)}>
        setStore("a", undefined)
      </button>

And I want to render it's unwrapped value on each change (and I don't know the change upfront)

<div>
        ⚠️ store - not updating because store is not reactive - only its values:{" "}
        {JSON.stringify(unwrap(store))}
      </div>

<div>
        ⚠️ store - not updating because store is not reactive - only its values:{" "}
        {JSON.stringify(unwrap(store))}
      </div>

How to make the store value reactive to unknown changes?

22 Replies

bigmistqke•2y ago

this is currently not possible, the advice given is to wrap setStore instead. Something like

const [store, _setStore] = createStore();
const setStore = (...args: any[]) => {
// ... do some stuff
_setStore(...args)
}

const [store, _setStore] = createStore();
const setStore = (...args: any[]) => {
// ... do some stuff
_setStore(...args)
}

nirtamir2OP•2y ago

Thanks! If I want to subscribe to unknown keys I think it's better to solve it by wrapping the store value in some object. Meaning: Instead of

type StoreValue = Record<string, number>;

 const [store, setStore] = createStore<StoreValue>({
    a: 0,
    b: 0,
  });

type StoreValue = Record<string, number>;

 const [store, setStore] = createStore<StoreValue>({
    a: 0,
    b: 0,
  });

Doing

type StoreValue = {value: Record<string, number>};

 const [store, setStore] = createStore<StoreValue>({value:{
    a: 0,
    b: 0,
  }});

type StoreValue = {value: Record<string, number>};

 const [store, setStore] = createStore<StoreValue>({value:{
    a: 0,
    b: 0,
  }});

Then I can do

        {JSON.stringify(unwrap(store.value))}

        {JSON.stringify(unwrap(store.value))}

Is it considered a best practice?

bigmistqke•2y ago

I don't think it makes a difference. This strategy of JSON.stringifying the store to trigger an effect will work, but there is a cost to JSON.stringify. It's not the most optimal way, the most optimal way rn would be to wrap the setter instead. as an aside, you do not need unwrap either. JSON.stringify(store) will be equivalent to JSON.stringify(unwrap(store)) afaik.

nirtamir2OP•2y ago

I try my suggestion - and it did not work I wonder why

bigmistqke•2y ago

if u could make a minimal reproduction in the playground, i can look at it

nirtamir2OP•2y ago

Yes

nirtamir2OP•2y ago

https://codesandbox.io/p/sandbox/solidjs-reactivity-context-reactive-store-setter-forked-rmix5o?file=%2Fsrc%2FApp.tsx&selection=%5B%7B%22endColumn%22%3A78%2C%22endLineNumber%22%3A41%2C%22startColumn%22%3A43%2C%22startLineNumber%22%3A41%7D%5D

solidjs reactivity - context reactive - store setter (forked)

CodeSandbox is an online editor tailored for web applications.

bigmistqke•2y ago

something specific u have questions about?

nirtamir2OP•2y ago

Yes - How make the <div>{JSON.stringify(unwrap(store.value))}</div> reactive I mean - I want it to change JSON.strinfigy(unwrap(store.value)) when value.a changes without knowing upfront that value.a changed (value["unknown")

bigmistqke•2y ago

ok don't unwrap i guess unwrap untracks the reactive value

nirtamir2OP•2y ago

You right! Thank you!

bigmistqke•2y ago

yes, i don't think u ever really need to use unwrap tbh u can just work w the proxy directly ur welcome!

nirtamir2OP•2y ago

Actually this seems resonable (unwrap inside effect does not track the dependency)

bigmistqke•2y ago

a didn't know that, never really touched it. only use it if i want cleaner debug-log to get rid of the proxy-clutter.

thetarnav•2y ago

there is also this thing: https://codesandbox.io/s/observing-state-6epzp?file=/index.js

ryansolid

CodeSandbox

Observing State - CodeSandbox

Observing State by ryansolid using babel-preset-solid, object-observer, solid-js

nirtamir2OP•2y ago

Thanks! Now I created another demo that confused me a bit Is JSON.stringify(store) reactive? Not that I removed the unwrap (my mistake for it sorry) it seems that store value is updated

nirtamir2OP•2y ago

@bigmistqke @thetarnav Sorry - my mistake - store is reactive. Meaning that if store.a changes - store changes too so it's jsx / effect will rerun. I infer it by looking at this codesandbox I created: https://codesandbox.io/p/sandbox/solidjs-reactivity-context-reactive-store-setter-eccv7z?file=%2Fsrc%2FApp.tsx&selection=%5B%7B%22endColumn%22%3A10%2C%22endLineNumber%22%3A16%2C%22startColumn%22%3A10%2C%22startLineNumber%22%3A16%7D%5D

solidjs reactivity - context reactive - store setter

CodeSandbox is an online editor tailored for web applications.

bigmistqke•2y ago

that's neat what is the question?

nirtamir2OP•2y ago

No question. Just clarification to myself and other that will look at this in the future Thanks for the help 🙂

bigmistqke•2y ago

ur welcome 👍

aryzing•14mo ago

By any chance would you know how to correctly type the aliased setStore with Typescript? When typed as below, the type of the args is never, which throws errors in the existing setters,

  function setStateAndDoStuff(...args: Parameters<typeof setState>) {
    setState(args);
    doStuff(state);
  }

  function setStateAndDoStuff(...args: Parameters<typeof setState>) {
    setState(args);
    doStuff(state);
  }

bigmistqke•14mo ago

there is StoreSetter from solid-js/store

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Subscribe to any unknown store change