feat: export defaultScheduler (#8872)

* feat: export defaultScheduleFn

so that users can set a different scheduler and fall back to the default, too

* chore: rename to defaultScheduler

Author: TkDodo

packages/query-core/src/index.ts

@@ -10,7 +10,7 @@ export { InfiniteQueryObserver } from './infiniteQueryObserver'
 export { MutationCache } from './mutationCache'
 export type { MutationCacheNotifyEvent } from './mutationCache'
 export { MutationObserver } from './mutationObserver'
-export { notifyManager } from './notifyManager'
+export { notifyManager, defaultScheduler } from './notifyManager'
 export { focusManager } from './focusManager'
 export { onlineManager } from './onlineManager'
 export {

packages/query-core/src/notifyManager.ts

@@ -10,6 +10,8 @@ type BatchCallsCallback<T extends Array<unknown>> = (...args: T) => void
 
 type ScheduleFunction = (callback: () => void) => void
 
+export const defaultScheduler: ScheduleFunction = (cb) => setTimeout(cb, 0)
+
 export function createNotifyManager() {
   let queue: Array<NotifyCallback> = []
   let transactions = 0
@@ -19,7 +21,7 @@ export function createNotifyManager() {
   let batchNotifyFn: BatchNotifyFunction = (callback: () => void) => {
     callback()
   }
-  let scheduleFn: ScheduleFunction = (cb) => setTimeout(cb, 0)
+  let scheduleFn = defaultScheduler
 
   const schedule = (callback: NotifyCallback): void => {
     if (transactions) {