fix(hydration): provide compat fallback for idle callback

packages/runtime-core/src/hydrationStrategies.ts

@@ -1,6 +1,21 @@
-import { isString } from '@vue/shared'
+import { getGlobalThis, isString } from '@vue/shared'
 import { DOMNodeTypes, isComment } from './hydration'
 
+// https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/compat/idle-callback.ts
+// Polyfills for Safari support
+// https://caniuse.com/requestidlecallback
+const requestIdleCallback: typeof getGlobalThis().requestIdleCallback =
+  getGlobalThis().requestIdleCallback ||
+  (cb => {
+    return setTimeout(cb, 1)
+  })
+
+const cancelIdleCallback: typeof getGlobalThis().cancelIdleCallback =
+  getGlobalThis().cancelIdleCallback ||
+  (id => {
+    clearTimeout(id)
+  })
+
 /**
  * A lazy hydration strategy for async components.
  * @param hydrate - call this to perform the actual hydration.