Update index.ts

Add check for typeof window, fallback to throttle if undefined

packages/scheduled/src/index.ts

@@ -112,7 +112,7 @@ export const throttle: ScheduleCallback = (callback, wait) => {
 export const scheduleIdle: ScheduleCallback = isServer
   ? () => Object.assign(() => void 0, { clear: () => void 0 })
   : // requestIdleCallback is not supported in Safari
-    (window.requestIdleCallback as typeof window.requestIdleCallback | undefined)
+    (typeof window !== 'undefined' && window.requestIdleCallback as typeof window.requestIdleCallback | undefined)
     ? (callback, maxWait) => {
         let isDeferred = false,
           id: ReturnType<typeof requestIdleCallback>,