fix(hydration): provide compat fallback for idle callback

packages/runtime-core/src/hydrationStrategies.ts

@@ -1,6 +1,27 @@
-import { isString } from '@vue/shared'
+import { getGlobalThis, isString } from '@vue/shared'
 import { DOMNodeTypes, isComment } from './hydration'
 
+const globalThis = getGlobalThis()
+// 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 globalThis.requestIdleCallback =
+  globalThis.requestIdleCallback ||
+  (cb => {
+    const start = Date.now()
+    const idleDeadline = {
+      didTimeout: false,
+      timeRemaining: () => Math.max(0, 50 - (Date.now() - start)),
+    }
+    return setTimeout(cb, 1)
+  })
+
+const cancelIdleCallback: typeof globalThis.cancelIdleCallback =
+  globalThis.cancelIdleCallback ||
+  (id => {
+    clearTimeout(id)
+  })
+
 /**
  * A lazy hydration strategy for async components.
  * @param hydrate - call this to perform the actual hydration.