react-code-dataset / react-query /packages /svelte-query /tests /createQuery /PlaceholderData.svelte
| <script lang="ts"> | |
| import { derived, writable } from 'svelte/store' | |
| import { createQuery, keepPreviousData } from '../../src/index.js' | |
| import { sleep } from '@tanstack/query-test-utils' | |
| import type { QueryClient, QueryObserverResult } from '@tanstack/query-core' | |
| import type { Writable } from 'svelte/store' | |
| export let queryClient: QueryClient | |
| export let states: Writable<Array<QueryObserverResult>> | |
| const count = writable(0) | |
| const options = derived(count, ($count) => ({ | |
| queryKey: ['test', $count], | |
| queryFn: () => sleep(10).then(() => $count), | |
| placeholderData: keepPreviousData, | |
| })) | |
| const query = createQuery(options, queryClient) | |
| $: states.update((prev) => [...prev, $query]) | |
| </script> | |
| <button on:click={() => ($count += 1)}>setCount</button> | |
| <div>Status: {$query.status}</div> | |
| <div>Data: {$query.data ?? 'undefined'}</div> | |