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

packages/svelte-query/tests/mutationOptions/mutationOptions.test-d.ts

@@ -0,0 +1,246 @@
+import { assertType, describe, expectTypeOf, it } from 'vitest'
+import { QueryClient } from '@tanstack/query-core'
+import { queryKey } from '@tanstack/query-test-utils'
+import {
+  createMutation,
+  mutationOptions,
+  useIsMutating,
+  useMutationState,
+} from '../../src/index.js'
+import type {
+  DefaultError,
+  MutationFunctionContext,
+  MutationState,
+  WithRequired,
+} from '@tanstack/query-core'
+import type {
+  CreateMutationOptions,
+  CreateMutationResult,
+} from '../../src/types.js'
+
+describe('mutationOptions', () => {
+  it('should not allow excess properties', () => {
+    const key = queryKey()
+
+    // @ts-expect-error this is a good error, because onMutates does not exist!
+    mutationOptions({
+      mutationFn: () => Promise.resolve(5),
+      mutationKey: key,
+      onMutates: 1000,
+      onSuccess: (data) => {
+        expectTypeOf(data).toEqualTypeOf<number>()
+      },
+    })
+  })
+
+  it('should infer types for callbacks', () => {
+    const key = queryKey()
+
+    mutationOptions({
+      mutationFn: () => Promise.resolve(5),
+      mutationKey: key,
+      onSuccess: (data) => {
+        expectTypeOf(data).toEqualTypeOf<number>()
+      },
+    })
+  })
+
+  it('should infer types for onError callback', () => {
+    const key = queryKey()
+
+    mutationOptions({
+      mutationFn: () => {
+        throw new Error('fail')
+      },
+      mutationKey: key,
+      onError: (error) => {
+        expectTypeOf(error).toEqualTypeOf<DefaultError>()
+      },
+    })
+  })
+
+  it('should infer types for variables', () => {
+    const key = queryKey()
+
+    mutationOptions<number, DefaultError, { id: string }>({
+      mutationFn: (vars) => {
+        expectTypeOf(vars).toEqualTypeOf<{ id: string }>()
+        return Promise.resolve(5)
+      },
+      mutationKey: key,
+    })
+  })
+
+  it('should infer result type correctly', () => {
+    const key = queryKey()
+
+    mutationOptions<number, DefaultError, void, { name: string }>({
+      mutationFn: () => Promise.resolve(5),
+      mutationKey: key,
+      onMutate: () => {
+        return { name: 'onMutateResult' }
+      },
+      onSuccess: (_data, _variables, onMutateResult) => {
+        expectTypeOf(onMutateResult).toEqualTypeOf<{ name: string }>()
+      },
+    })
+  })
+
+  it('should infer context type correctly', () => {
+    const key = queryKey()
+
+    mutationOptions<number>({
+      mutationFn: (_variables, context) => {
+        expectTypeOf(context).toEqualTypeOf<MutationFunctionContext>()
+        return Promise.resolve(5)
+      },
+      mutationKey: key,
+      onMutate: (_variables, context) => {
+        expectTypeOf(context).toEqualTypeOf<MutationFunctionContext>()
+      },
+      onSuccess: (_data, _variables, _onMutateResult, context) => {
+        expectTypeOf(context).toEqualTypeOf<MutationFunctionContext>()
+      },
+      onError: (_error, _variables, _onMutateResult, context) => {
+        expectTypeOf(context).toEqualTypeOf<MutationFunctionContext>()
+      },
+      onSettled: (_data, _error, _variables, _onMutateResult, context) => {
+        expectTypeOf(context).toEqualTypeOf<MutationFunctionContext>()
+      },
+    })
+  })
+
+  it('should error if mutationFn return type mismatches TData', () => {
+    assertType(
+      mutationOptions<number>({
+        // @ts-expect-error this is a good error, because return type is string, not number
+        mutationFn: async () => Promise.resolve('wrong return'),
+      }),
+    )
+  })
+
+  it('should allow mutationKey to be omitted', () => {
+    return mutationOptions({
+      mutationFn: () => Promise.resolve(123),
+      onSuccess: (data) => {
+        expectTypeOf(data).toEqualTypeOf<number>()
+      },
+    })
+  })
+
+  it('should infer all types when not explicitly provided', () => {
+    const key = queryKey()
+
+    expectTypeOf(
+      mutationOptions({
+        mutationFn: (id: string) => Promise.resolve(id.length),
+        mutationKey: key,
+        onSuccess: (data) => {
+          expectTypeOf(data).toEqualTypeOf<number>()
+        },
+      }),
+    ).toEqualTypeOf<
+      WithRequired<
+        CreateMutationOptions<number, DefaultError, string>,
+        'mutationKey'
+      >
+    >()
+    expectTypeOf(
+      mutationOptions({
+        mutationFn: (id: string) => Promise.resolve(id.length),
+        onSuccess: (data) => {
+          expectTypeOf(data).toEqualTypeOf<number>()
+        },
+      }),
+    ).toEqualTypeOf<
+      Omit<CreateMutationOptions<number, DefaultError, string>, 'mutationKey'>
+    >()
+  })
+
+  it('should work when used with createMutation', () => {
+    const key = queryKey()
+
+    const mutation = createMutation(() =>
+      mutationOptions({
+        mutationKey: key,
+        mutationFn: () => Promise.resolve('data'),
+        onSuccess: (data) => {
+          expectTypeOf(data).toEqualTypeOf<string>()
+        },
+      }),
+    )
+    expectTypeOf(mutation).toEqualTypeOf<
+      CreateMutationResult<string, DefaultError, void, unknown>
+    >()
+
+    createMutation(() =>
+      // should allow when used with createMutation without mutationKey
+      mutationOptions({
+        mutationFn: () => Promise.resolve('data'),
+        onSuccess: (data) => {
+          expectTypeOf(data).toEqualTypeOf<string>()
+        },
+      }),
+    )
+  })
+
+  it('should work when used with useIsMutating', () => {
+    const key = queryKey()
+
+    const isMutating = useIsMutating(
+      mutationOptions({
+        mutationKey: key,
+        mutationFn: () => Promise.resolve(5),
+      }),
+    )
+    expectTypeOf(isMutating.current).toEqualTypeOf<number>()
+
+    useIsMutating(
+      // @ts-expect-error filters should have mutationKey
+      mutationOptions({
+        mutationFn: () => Promise.resolve(5),
+      }),
+    )
+  })
+
+  it('should work when used with queryClient.isMutating', () => {
+    const key = queryKey()
+    const queryClient = new QueryClient()
+
+    const isMutating = queryClient.isMutating(
+      mutationOptions({
+        mutationKey: key,
+        mutationFn: () => Promise.resolve(5),
+      }),
+    )
+    expectTypeOf(isMutating).toEqualTypeOf<number>()
+
+    queryClient.isMutating(
+      // @ts-expect-error filters should have mutationKey
+      mutationOptions({
+        mutationFn: () => Promise.resolve(5),
+      }),
+    )
+  })
+
+  it('should work when used with useMutationState', () => {
+    const key = queryKey()
+
+    const mutationState = useMutationState({
+      filters: mutationOptions({
+        mutationKey: key,
+        mutationFn: () => Promise.resolve(5),
+      }),
+    })
+    expectTypeOf(mutationState).toEqualTypeOf<
+      Array<MutationState<unknown, Error, unknown, unknown>>
+    >()
+
+    useMutationState({
+      // @ts-expect-error filters should have mutationKey
+      filters: mutationOptions({
+        mutationFn: () => Promise.resolve(5),
+      }),
+    })
+  })
+})