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

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

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+---
+id: MutationState
+title: MutationState
+---
+
+Defined in: [packages/query-core/src/mutation.ts:30](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L30)
+
+The raw state stored on a `Mutation` instance. This is the underlying state
+that observer results (e.g. `MutationObserverResult`) are derived from.
+
+## Extended by
+
+- [`MutationObserverBaseResult`](MutationObserverBaseResult.md)
+
+## Type Parameters
+
+### TData
+
+`TData` = `unknown`
+
+### TError
+
+`TError` = [`DefaultError`](../type-aliases/DefaultError.md)
+
+### TVariables
+
+`TVariables` = `unknown`
+
+### 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.
+
+***
+
+### data
+
+```ts
+data: TData | undefined;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:44](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L44)
+
+The last successfully resolved data for the mutation.
+
+***
+
+### error
+
+```ts
+error: TError | null;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:49](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L49)
+
+The error object for the mutation, if the last attempt resulted in an error.
+- Defaults to `null`.
+
+***
+
+### 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.
+
+***
+
+### 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.
+
+***
+
+### 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.
+
+***
+
+### status
+
+```ts
+status: MutationStatus;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:66](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L66)
+
+The status of the mutation.
+
+***
+
+### 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.
+
+***
+
+### variables
+
+```ts
+variables: TVariables | undefined;
+```
+
+Defined in: [packages/query-core/src/mutation.ts:70](https://github.com/TanStack/query/blob/main/packages/query-core/src/mutation.ts#L70)
+
+The variables the mutation was last called with.