# Interface: DecorateMutationProcedure<TDef>

> 

Defined in: [tanstack-react-query/src/internals/createOptionsProxy.ts:240](https://github.com/trpc/trpc/blob/7c907acfd8b31929214792e3b8c2ad7a8ac72563/packages/tanstack-react-query/src/internals/createOptionsProxy.ts#L240)

The helpers for a mutation procedure.

## See

https://trpc.io/docs/client/tanstack-react-query/usage#mutationOptions

## Extends

- `TypeHelper`\<`TDef`\>

## Type Parameters

| Type Parameter |
| ------ |
| `TDef` *extends* `ResolverDef` |

## Properties

### mutationKey()

> **mutationKey**: () => [`TRPCMutationKey`](https://trpc.io/docs/typedoc/tanstack-react-query/type-aliases/TRPCMutationKey.md)\<`TDef`\[`"featureFlags"`\]\[`"keyPrefix"`\]\>

Defined in: [tanstack-react-query/src/internals/createOptionsProxy.ts:255](https://github.com/trpc/trpc/blob/7c907acfd8b31929214792e3b8c2ad7a8ac72563/packages/tanstack-react-query/src/internals/createOptionsProxy.ts#L255)

Calculate the TanStack Mutation Key for a Mutation Procedure

#### Returns

[`TRPCMutationKey`](https://trpc.io/docs/typedoc/tanstack-react-query/type-aliases/TRPCMutationKey.md)\<`TDef`\[`"featureFlags"`\]\[`"keyPrefix"`\]\>

#### See

https://trpc.io/docs/client/tanstack-react-query/usage#mutationKey

***

### mutationOptions

> **mutationOptions**: [`TRPCMutationOptions`](https://trpc.io/docs/typedoc/tanstack-react-query/interfaces/TRPCMutationOptions.md)\<`TDef`\>

Defined in: [tanstack-react-query/src/internals/createOptionsProxy.ts:248](https://github.com/trpc/trpc/blob/7c907acfd8b31929214792e3b8c2ad7a8ac72563/packages/tanstack-react-query/src/internals/createOptionsProxy.ts#L248)

Create a set of type-safe mutation options that can be passed to `useMutation`

#### See

https://trpc.io/docs/client/tanstack-react-query/usage#mutationOptions