SolidJS•16mo ago

Can a Solid store contain class objects?

Can a Solid store contain class objects? When I implement a simple type like below as a class, reactivity breaks for me when surfacing in a Solid store via a context provider.

// Works 
export type ArtistProps = {
  id: number;
  name: string;
  genre: string;
};
... setter({ id: 1, "Kiss", "Rock "})

// Works 
export type ArtistProps = {
  id: number;
  name: string;
  genre: string;
};
... setter({ id: 1, "Kiss", "Rock "})

// Doesn't work
export type ArtistProps = {
  constructor (readonly id: number, name: string, genre: string) {}
};
... setter(new {1, "Kiss", "Rock"})

// Doesn't work
export type ArtistProps = {
  constructor (readonly id: number, name: string, genre: string) {}
};
... setter(new {1, "Kiss", "Rock"})

Do Solid store objects need to be pojos?

10 Replies

Unknown User•16mo ago

Message Not Public

REEEEE•16mo ago

Classes aren't reactive by default

romanobro•16mo ago

solid stores do not work with classes, watched this video today actually and its quite good https://youtu.be/HsMAMsaDpzU

Jeman Dev

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hotshoe•16mo ago

Thx for the ptr @romanobro , the video certainly makes it clear that classes are not supported, and I re-checked the docs and found

Classes are not wrapped, so objects like Date, HTMLElement, RegExp, Map, Set won't be granularly reactive as properties on a store.

so, it seems I glossed over this. Too bad not supported 😦 as this is something Svelte handles by default (although, I much prefer Solid's reactivity model overall).

REEEEE•16mo ago

You can make the class itself reactive though im not sure how it would work in a store, might be fine If you add, return createMutable(this) to the constructor

hotshoe•16mo ago

@._rb , Your suggestion works (in a store). Thank you!! The docs discourage usage so I didn't try, but leaves me in no worse shape (from caveat perspective than with Svelte, where everything is 2-way binding) and my use case is special case. Sorry to keep mentioning Svelte, btw, I'm developing my next project using both SK And SS to decide on my metafw of choice going fwd and heavily leaning towards SS -- just wish it was 1.0 then would be easy choice for me, which says a lot about how awesome SS is. Thanks again!

Unknown User•16mo ago

Message Not Public

Joe Pea•16mo ago

You can use createStore and createMutable with classes, but createMutable is gonna be a lot easier.

class Thing {
  a = 1
  b = 2
  c = 3

  doSomething() {
    this.a++
  }

  constructor() {
    return createMutable(this)
  }
}

const thing = new Thing()

createEffect(() => {
  console.log(thing.a, thing.b, thing.c)
})

thing.doSomething() // logs
thing.b++ // logs
thing.c++ // logs

class Thing {
  a = 1
  b = 2
  c = 3

  doSomething() {
    this.a++
  }

  constructor() {
    return createMutable(this)
  }
}

const thing = new Thing()

createEffect(() => {
  console.log(thing.a, thing.b, thing.c)
})

thing.doSomething() // logs
thing.b++ // logs
thing.c++ // logs

Try in Playground: https://playground.solidjs.com/anonymous/19fe511b-71e5-4bb1-9e4d-a6d5995da239

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Joe Pea•16mo ago

If you have decorators, I help make some new class patterns possible with classy-solid https://github.com/lume/classy-solid For example:

@reactive class Thing {
  @signal a = 1 // reactive
  @signal b = 2 // reactive
  c = 3 // not reactive
}

const thing = new Thing()

createEffect(() => {
  console.log(thing.a, thing.b)
})

createEffect(() => {
  console.log(thing.c) // will not re-run, not a signal
})

@reactive class Thing {
  @signal a = 1 // reactive
  @signal b = 2 // reactive
  c = 3 // not reactive
}

const thing = new Thing()

createEffect(() => {
  console.log(thing.a, thing.b)
})

createEffect(() => {
  console.log(thing.c) // will not re-run, not a signal
})

GitHub

GitHub - lume/classy-solid: Solid.js reactivity patterns for classe...

Solid.js reactivity patterns for classes, and class components. - GitHub - lume/classy-solid: Solid.js reactivity patterns for classes, and class components.

Joe Pea•16mo ago

For reference, here's a class using createStore:

class Thing {
  a = 1
  b = 2
  c = 3

  doSomething() {
    this.__setState(state => ({...state, a: this.a + 1}))
  }

  incB() {
    this.__setState(state => ({...state, b: this.b + 1}))
  }

  incC() {
    this.__setState(state => ({...state, c: this.c + 1}))
  }
  
  __ = createStore(this)
  __state = this.__[0]
  __setState = this.__[1]

  constructor() {
    return this.__state
  }
}

const thing = new Thing()

createEffect(() => {
  console.log(thing.a, thing.b, thing.c)
})

thing.doSomething() // logs
thing.incB() // logs
thing.incC() // logs

class Thing {
  a = 1
  b = 2
  c = 3

  doSomething() {
    this.__setState(state => ({...state, a: this.a + 1}))
  }

  incB() {
    this.__setState(state => ({...state, b: this.b + 1}))
  }

  incC() {
    this.__setState(state => ({...state, c: this.c + 1}))
  }
  
  __ = createStore(this)
  __state = this.__[0]
  __setState = this.__[1]

  constructor() {
    return this.__state
  }
}

const thing = new Thing()

createEffect(() => {
  console.log(thing.a, thing.b, thing.c)
})

thing.doSomething() // logs
thing.incB() // logs
thing.incC() // logs

createStore is more restrictive, the end user of the class cannot mutate properties directly, but you can expose methods to do so. Playground: https://playground.solidjs.com/anonymous/05e85883-2abb-4e5a-a5f3-5e2977b689b4

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Can a Solid store contain class objects?