Function useMutationState

packages/react-query/src/useMutationState.ts:63–100

(
  options: MutationStateOptions<TResult, TMutation> = {},
  queryClient?: QueryClient,
)

}

export function useMutationState<
  TResult = MutationState,
  TMutation extends Mutation<any, any, any, any> =
    MutationTypeFromResult<TResult>,
>(
  options: MutationStateOptions<TResult, TMutation> = {},
  queryClient?: QueryClient,
): Array<TResult> {
  const mutationCache = useQueryClient(queryClient).getMutationCache()
  const optionsRef = React.useRef(options)
  const result = React.useRef<Array<TResult>>(null)
  if (result.current === null) {
    result.current = getResult(mutationCache, options)
  }

  React.useEffect(() => {
    optionsRef.current = options
  })

  return React.useSyncExternalStore(
    React.useCallback(
      (onStoreChange) =>
        mutationCache.subscribe(() => {
          const nextResult = replaceEqualDeep(
            result.current,
            getResult(mutationCache, optionsRef.current),
          )
          if (result.current !== nextResult) {
            result.current = nextResult
            notifyManager.schedule(onStoreChange)
          }
        }),
      [mutationCache],
    ),
    () => result.current,
    () => result.current,
  )!
}