Created
March 4, 2026 23:34
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Svelte 5 with Tanstack query reactivity issue
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| import { createQueries } from '@tanstack/svelte-query' | |
| import { SvelteDate } from 'svelte/reactivity' | |
| export class StoreX { | |
| states = $state<Record<string, 'connected' | 'disconnected'>>({}) | |
| connectedItems = $derived.by(() => { | |
| return Object.keys(this.states).filter((key) => this.states[key] === 'connected') | |
| }) | |
| disconnectedItems = $derived.by(() => { | |
| return Object.keys(this.states).filter((key) => this.states[key] !== 'connected') | |
| }) | |
| results = $state<string[]>([]) | |
| stateQueries = createQueries(() => { | |
| console.log('creating state queries for:', this.disconnectedItems) | |
| return { | |
| queries: this.disconnectedItems.map((key) => { | |
| return { | |
| queryKey: ['connect', key], | |
| queryFn: async () => { | |
| console.log('connecting to', key) | |
| await new Promise((resolve) => setTimeout(resolve, 1000)) | |
| return 'connected' | |
| }, | |
| refetchInterval: 2000 | |
| } | |
| }) | |
| } | |
| }) | |
| resultQueries = createQueries(() => { | |
| console.log('creating result queries for:', this.connectedItems) | |
| return { | |
| queries: this.connectedItems.map((key) => { | |
| return { | |
| queryKey: ['fetch-result', key], | |
| queryFn: async () => { | |
| console.log('fetching result for', key) | |
| await new Promise((resolve) => setTimeout(resolve, 1000)) | |
| const result = `Result for ${key} at ${new SvelteDate().toLocaleTimeString()}` | |
| return result | |
| }, | |
| refetchInterval: 2000 | |
| } | |
| }) | |
| } | |
| }) | |
| constructor() { | |
| $effect(() => { | |
| this.stateQueries.forEach((query, idx) => { | |
| console.log('test query', query.data) | |
| if (query.data === 'connected') { | |
| const key = this.disconnectedItems[idx] | |
| this.states[key] = 'connected' | |
| console.log('connected to', key) | |
| } | |
| }) | |
| }) | |
| // despite queries being executed this effect will only run once on start, why? | |
| $effect(() => { | |
| console.log('results effect') | |
| this.resultQueries.forEach((query) => { | |
| console.log('result query data', query.data) | |
| if (query.data) { | |
| const result = query.data | |
| if (!this.results.includes(result)) { | |
| this.results.push(result) | |
| console.log('fetched result:', result) | |
| } | |
| } | |
| }) | |
| }) | |
| } | |
| } |
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