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

docs/framework/svelte/reference/interfaces/MutationObserverBaseResult.md

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+---
+id: MutationObserverBaseResult
+title: MutationObserverBaseResult
+---
+
+Defined in: [packages/query-core/src/types.ts:1335](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1335)
+
+The raw state stored on a `Mutation` instance. This is the underlying state
+that observer results (e.g. `MutationObserverResult`) are derived from.
+
+## Extends
+
+- [`MutationState`](MutationState.md)\<`TData`, `TError`, `TVariables`, `TOnMutateResult`\>
+
+## Extended by
+
+- [`MutationObserverIdleResult`](MutationObserverIdleResult.md)
+- [`MutationObserverLoadingResult`](MutationObserverLoadingResult.md)
+- [`MutationObserverErrorResult`](MutationObserverErrorResult.md)
+- [`MutationObserverSuccessResult`](MutationObserverSuccessResult.md)
+
+## Type Parameters
+
+### TData
+
+`TData` = `unknown`
+
+### TError
+
+`TError` = [`DefaultError`](../type-aliases/DefaultError.md)
+
+### TVariables
+
+`TVariables` = `void`
+
+### TOnMutateResult
+
+`TOnMutateResult` = `unknown`
+
+## Properties
+
+### context
+
+```ts
+context: TOnMutateResult | undefined;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:40](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L40)
+
+The value returned by `onMutate`, if defined. Passed to `onSuccess`,
+`onError` and `onSettled` as the mutation's context.
+
+#### Inherited from
+
+[`MutationState`](MutationState.md).[`context`](MutationState.md#context)
+
+***
+
+### data
+
+```ts
+data: TData | undefined;
+```
+
+Defined in: [packages/query-core/src/types.ts:1344](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1344)
+
+The last successfully resolved data for the mutation.
+
+#### Overrides
+
+[`MutationState`](MutationState.md).[`data`](MutationState.md#data)
+
+***
+
+### error
+
+```ts
+error: TError | null;
+```
+
+Defined in: [packages/query-core/src/types.ts:1353](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1353)
+
+The error object for the mutation, if an error was encountered.
+- Defaults to `null`.
+
+#### Overrides
+
+[`MutationState`](MutationState.md).[`error`](MutationState.md#error)
+
+***
+
+### failureCount
+
+```ts
+failureCount: number;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:53](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L53)
+
+The number of times the mutation function has failed for the current attempt.
+
+#### Inherited from
+
+[`MutationState`](MutationState.md).[`failureCount`](MutationState.md#failurecount)
+
+***
+
+### failureReason
+
+```ts
+failureReason: TError | null;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:57](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L57)
+
+The reason the current attempt failed, as reported by the retryer.
+
+#### Inherited from
+
+[`MutationState`](MutationState.md).[`failureReason`](MutationState.md#failurereason)
+
+***
+
+### isError
+
+```ts
+isError: boolean;
+```
+
+Defined in: [packages/query-core/src/types.ts:1358](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1358)
+
+A boolean variable derived from `status`.
+- `true` if the last mutation attempt resulted in an error.
+
+***
+
+### isIdle
+
+```ts
+isIdle: boolean;
+```
+
+Defined in: [packages/query-core/src/types.ts:1363](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1363)
+
+A boolean variable derived from `status`.
+- `true` if the mutation is in its initial state prior to executing.
+
+***
+
+### isPaused
+
+```ts
+isPaused: boolean;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:62](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L62)
+
+Whether the mutation is currently paused (see network mode), or is
+waiting for another mutation with the same `scope` to finish.
+
+#### Inherited from
+
+[`MutationState`](MutationState.md).[`isPaused`](MutationState.md#ispaused)
+
+***
+
+### isPending
+
+```ts
+isPending: boolean;
+```
+
+Defined in: [packages/query-core/src/types.ts:1368](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1368)
+
+A boolean variable derived from `status`.
+- `true` if the mutation is currently executing.
+
+***
+
+### isSuccess
+
+```ts
+isSuccess: boolean;
+```
+
+Defined in: [packages/query-core/src/types.ts:1373](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1373)
+
+A boolean variable derived from `status`.
+- `true` if the last mutation attempt was successful.
+
+***
+
+### mutate
+
+```ts
+mutate: MutateFunction<TData, TError, TVariables, TOnMutateResult>;
+```
+
+Defined in: [packages/query-core/src/types.ts:1393](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1393)
+
+The mutation function you can call with variables to trigger the mutation and optionally hooks on additional callback options.
+
+#### Param
+
+The variables object to pass to the `mutationFn`.
+
+#### Param
+
+This function will fire when the mutation is successful and will be passed the mutation's result.
+
+#### Param
+
+This function will fire if the mutation encounters an error and will be passed the error.
+
+#### Param
+
+This function will fire when the mutation is either successfully fetched or encounters an error and be passed either the data or error.
+
+#### Remarks
+
+- If you make multiple requests, `onSuccess` will fire only after the latest call you've made.
+- All the callback functions (`onSuccess`, `onError`, `onSettled`) are void functions, and the returned value will be ignored.
+
+***
+
+### reset()
+
+```ts
+reset: () => void;
+```
+
+Defined in: [packages/query-core/src/types.ts:1397](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1397)
+
+A function to clean the mutation internal state (i.e., it resets the mutation to its initial state).
+
+#### Returns
+
+`void`
+
+***
+
+### status
+
+```ts
+status: MutationStatus;
+```
+
+Defined in: [packages/query-core/src/types.ts:1382](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1382)
+
+The status of the mutation.
+- Will be:
+  - `idle` initial status prior to the mutation function executing.
+  - `pending` if the mutation is currently executing.
+  - `error` if the last mutation attempt resulted in an error.
+  - `success` if the last mutation attempt was successful.
+
+#### Overrides
+
+[`MutationState`](MutationState.md).[`status`](MutationState.md#status)
+
+***
+
+### submittedAt
+
+```ts
+submittedAt: number;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:74](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L74)
+
+The timestamp for when the mutation was submitted.
+
+#### Inherited from
+
+[`MutationState`](MutationState.md).[`submittedAt`](MutationState.md#submittedat)
+
+***
+
+### variables
+
+```ts
+variables: TVariables | undefined;
+```
+
+Defined in: [packages/query-core/src/types.ts:1348](https://github.com/TanStack/query/blob/main/packages/query-core/src/types.ts#L1348)
+
+The variables object passed to the `mutationFn`.
+
+#### Overrides
+
+[`MutationState`](MutationState.md).[`variables`](MutationState.md#variables)