snapshot of https://github.com/TanStack/query.git (main, 2026-09-16; blobs > 131072B omitted)

packages/svelte-query/tests/useIsMutating/Base.svelte

@@ -0,0 +1,25 @@
+<script lang="ts">
+  import type { QueryClient } from '@tanstack/query-core'
+  import { queryKey, sleep } from '@tanstack/query-test-utils'
+  import { setQueryClientContext } from '../../src/context.js'
+  import { createMutation, useIsMutating } from '../../src/index.js'
+
+  type Props = {
+    queryClient: QueryClient
+  }
+
+  let { queryClient }: Props = $props()
+
+  setQueryClientContext(queryClient)
+
+  const mutation = createMutation(() => ({
+    mutationKey: queryKey(),
+    mutationFn: () => sleep(10).then(() => 'data'),
+  }))
+
+  const isMutating = useIsMutating()
+</script>
+
+<button onclick={() => mutation.mutate()}>Trigger</button>
+
+<div>isMutating: {isMutating.current}</div>

packages/svelte-query/tests/useIsMutating/useIsMutating.svelte.test.ts

@@ -0,0 +1,32 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { fireEvent, render } from '@testing-library/svelte'
+import { QueryClient } from '@tanstack/query-core'
+import Base from './Base.svelte'
+
+describe('useIsMutating', () => {
+  let queryClient: QueryClient
+
+  beforeEach(() => {
+    vi.useFakeTimers()
+    queryClient = new QueryClient()
+  })
+
+  afterEach(() => {
+    queryClient.clear()
+    vi.useRealTimers()
+  })
+
+  it('should update as queries start and stop mutating', async () => {
+    const rendered = render(Base, {
+      props: { queryClient },
+    })
+
+    expect(rendered.getByText('isMutating: 0')).toBeInTheDocument()
+
+    fireEvent.click(rendered.getByRole('button', { name: /Trigger/i }))
+    await vi.advanceTimersByTimeAsync(0)
+    expect(rendered.getByText('isMutating: 1')).toBeInTheDocument()
+    await vi.advanceTimersByTimeAsync(10)
+    expect(rendered.getByText('isMutating: 0')).toBeInTheDocument()
+  })
+})