isError: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverErrorResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>

isError: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverErrorResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>

isIdle: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverIdleResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>

isIdle: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverIdleResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>

isPending: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverLoadingResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>

isPending: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverLoadingResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>

isSuccess: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverSuccessResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>

isSuccess: SignalFunction<
  (this) => this is CreateMutationResult<
    TData,
    TError,
    TVariables,
    TContext,
    Override<
      MutationObserverSuccessResult<TData, TError, TVariables, TContext>,
      { mutate: CreateMutateFunction<TData, TError, TVariables, TContext> }
    > & {
      mutateAsync: CreateMutateAsyncFunction<
        TData,
        TError,
        TVariables,
        TContext
      >
    }
  >
>