# MutationObserverOptions

Defined in: [packages/query-core/src/types.ts:1267](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1267)

## Extends

- `MutationOptions`\<`TData`, `TError`, `TVariables`, `TOnMutateResult`\>

## Type Parameters

### TData

`TData` = `unknown`

### TError

`TError` = [`DefaultError`](../type-aliases/DefaultError.md)

### TVariables

`TVariables` = `void`

### TOnMutateResult

`TOnMutateResult` = `unknown`

## Properties

### gcTime?

```ts
optional gcTime: number;
```

Defined in: [packages/query-core/src/types.ts:1260](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1260)

The time in milliseconds that an unused/inactive mutation remains in memory before it is
garbage collected.

Defaults to `5 * 60 * 1000` (5 minutes), or `Infinity` during SSR.

#### Inherited from

```ts
MutationOptions.gcTime
```

***

### meta?

```ts
optional meta: Record<string, unknown>;
```

Defined in: [packages/query-core/src/types.ts:1263](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1263)

#### Inherited from

```ts
MutationOptions.meta
```

***

### mutationFn?

```ts
optional mutationFn: MutationFunction<TData, TVariables>;
```

Defined in: [packages/query-core/src/types.ts:1206](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1206)

#### Inherited from

```ts
MutationOptions.mutationFn
```

***

### mutationKey?

```ts
optional mutationKey: readonly unknown[];
```

Defined in: [packages/query-core/src/types.ts:1207](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1207)

#### Inherited from

```ts
MutationOptions.mutationKey
```

***

### networkMode?

```ts
optional networkMode: NetworkMode;
```

Defined in: [packages/query-core/src/types.ts:1253](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1253)

Controls whether a mutation is allowed to run based on the current network connectivity.

Defaults to `'online'`.

#### See

[Network Mode](https://tanstack.com/query/latest/docs/framework/react/guides/network-mode) for more information.

#### Inherited from

```ts
MutationOptions.networkMode
```

***

### onError()?

```ts
optional onError: (error, variables, onMutateResult, context) => unknown;
```

Defined in: [packages/query-core/src/types.ts:1218](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1218)

#### Parameters

##### error

`TError`

##### variables

`TVariables`

##### onMutateResult

`TOnMutateResult` | `undefined`

##### context

[`MutationFunctionContext`](../type-aliases/MutationFunctionContext.md)

#### Returns

`unknown`

#### Inherited from

```ts
MutationOptions.onError
```

***

### onMutate()?

```ts
optional onMutate: (variables, context) => TOnMutateResult | Promise<TOnMutateResult>;
```

Defined in: [packages/query-core/src/types.ts:1208](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1208)

#### Parameters

##### variables

`TVariables`

##### context

[`MutationFunctionContext`](../type-aliases/MutationFunctionContext.md)

#### Returns

`TOnMutateResult` \| `Promise`\<`TOnMutateResult`\>

#### Inherited from

```ts
MutationOptions.onMutate
```

***

### onSettled()?

```ts
optional onSettled: (data, error, variables, onMutateResult, context) => unknown;
```

Defined in: [packages/query-core/src/types.ts:1224](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1224)

#### Parameters

##### data

`TData` | `undefined`

##### error

`TError` | `null`

##### variables

`TVariables`

##### onMutateResult

`TOnMutateResult` | `undefined`

##### context

[`MutationFunctionContext`](../type-aliases/MutationFunctionContext.md)

#### Returns

`unknown`

#### Inherited from

```ts
MutationOptions.onSettled
```

***

### onSuccess()?

```ts
optional onSuccess: (data, variables, onMutateResult, context) => unknown;
```

Defined in: [packages/query-core/src/types.ts:1212](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1212)

#### Parameters

##### data

`TData`

##### variables

`TVariables`

##### onMutateResult

`TOnMutateResult`

##### context

[`MutationFunctionContext`](../type-aliases/MutationFunctionContext.md)

#### Returns

`unknown`

#### Inherited from

```ts
MutationOptions.onSuccess
```

***

### retry?

```ts
optional retry: RetryValue<TError>;
```

Defined in: [packages/query-core/src/types.ts:1239](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1239)

If `false`, failed mutations will not retry by default.
If `true`, failed mutations will retry infinitely.
If set to an integer number, e.g. 3, failed mutations will retry until the failed mutation count meets that number.
If set to a function `(failureCount, error) => boolean` failed mutations will retry until the function returns false.

Defaults to `0`.

#### Inherited from

```ts
MutationOptions.retry
```

***

### retryDelay?

```ts
optional retryDelay: RetryDelayValue<TError>;
```

Defined in: [packages/query-core/src/types.ts:1246](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1246)

This function receives a `retryAttempt` integer and the actual Error and returns the delay to apply before the
next attempt in milliseconds.

Defaults to a function that applies exponential backoff, capped at 30 seconds.

#### Inherited from

```ts
MutationOptions.retryDelay
```

***

### scope?

```ts
optional scope: MutationScope;
```

Defined in: [packages/query-core/src/types.ts:1264](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1264)

#### Inherited from

```ts
MutationOptions.scope
```

***

### throwOnError?

```ts
optional throwOnError: boolean | (error) => boolean;
```

Defined in: [packages/query-core/src/types.ts:1281](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1281)

Whether errors should be thrown instead of setting the `error` property.
If set to `true`, all errors will be thrown to the nearest error boundary.
If set to a function, it will be passed the error and should return a boolean indicating whether to throw the
error (`true`) or return it as state (`false`).

Defaults to `false`.