core: fix SUSPENSE typings

Author: josepot

packages/core/src/SUSPENSE.ts

@@ -4,7 +4,4 @@
  * leverage React Suspense API while we are waiting for that value.
  */
 export const SUSPENSE = Symbol("SUSPENSE")
-
-export const filterOutSuspense = <T>(
-  value: T,
-): value is Exclude<T, typeof SUSPENSE> => value !== (SUSPENSE as any)
+export type SUSPENSE = typeof SUSPENSE

packages/core/src/useStateObservable.ts

@@ -1,5 +1,5 @@
 import { useRef, useState } from "react"
-import { SUSPENSE, filterOutSuspense } from "./SUSPENSE"
+import { SUSPENSE } from "./SUSPENSE"
 import { DefaultedStateObservable, StateObservable } from "@rxstate/core"
 import { EMPTY_VALUE } from "./internal/empty-value"
 import useSyncExternalStore from "./internal/useSyncExternalStore"
@@ -12,6 +12,9 @@ interface Ref<T> {
   args: [(cb: VoidCb) => VoidCb, () => Exclude<T, typeof SUSPENSE>]
 }
 
+const filterOutSuspense = <T>(value: T): value is Exclude<T, SUSPENSE> =>
+  value !== (SUSPENSE as any)
+
 export const useStateObservable = <O>(
   source$: StateObservable<O>,
 ): Exclude<O, typeof SUSPENSE> => {