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---
id: injectIsMutating
title: injectIsMutating
---
# Function: injectIsMutating()
```ts
function injectIsMutating(filters?, options?): Signal<number>
```
Injects a signal that tracks the number of mutations that your application is fetching.
Can be used for app-wide loading indicators
## Parameters
### filters?
`MutationFilters`\<`unknown`, `Error`, `unknown`, `unknown`\>
The filters to apply to the query.
### options?
[`InjectIsMutatingOptions`](../../interfaces/injectismutatingoptions.md)
Additional configuration
## Returns
`Signal`\<`number`\>
signal with number of fetching mutations.
## Defined in
[inject-is-mutating.ts:31](https://github.com/TanStack/query/blob/main/packages/angular-query-experimental/src/inject-is-mutating.ts#L31)
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