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import {
DestroyRef,
Injector,
NgZone,
assertInInjectionContext,
inject,
signal,
} from '@angular/core'
import { QueryClient, notifyManager } from '@tanstack/query-core'
import type { MutationFilters } from '@tanstack/query-core'
import type { Signal } from '@angular/core'
export interface InjectIsMutatingOptions {
/**
* The `Injector` in which to create the isMutating signal.
*
* If this is not provided, the current injection context will be used instead (via `inject`).
*/
injector?: Injector
}
/**
* Injects a signal that tracks the number of mutations that your application is fetching.
*
* Can be used for app-wide loading indicators
* @param filters - The filters to apply to the query.
* @param options - Additional configuration
* @returns signal with number of fetching mutations.
* @public
*/
export function injectIsMutating(
filters?: MutationFilters,
options?: InjectIsMutatingOptions,
): Signal<number> {
!options?.injector && assertInInjectionContext(injectIsMutating)
const injector = options?.injector ?? inject(Injector)
const destroyRef = injector.get(DestroyRef)
const ngZone = injector.get(NgZone)
const queryClient = injector.get(QueryClient)
const cache = queryClient.getMutationCache()
// isMutating is the prev value initialized on mount *
let isMutating = queryClient.isMutating(filters)
const result = signal(isMutating)
const unsubscribe = ngZone.runOutsideAngular(() =>
cache.subscribe(
notifyManager.batchCalls(() => {
const newIsMutating = queryClient.isMutating(filters)
if (isMutating !== newIsMutating) {
// * and update with each change
isMutating = newIsMutating
ngZone.run(() => {
result.set(isMutating)
})
}
}),
),
)
destroyRef.onDestroy(unsubscribe)
return result
}
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