fix(nvue): support App onError #3851

packages/uni-shared/src/onCreateVueApp.ts

 import type { App } from 'vue'
+import { isFunction } from '@vue/shared'
+import { once } from './utils'
 type CreateVueAppHook = (app: App) => void
 
 let vueApp: App
@@ -18,3 +20,14 @@ export function invokeCreateVueAppHook(app: App) {
   vueApp = app
   createVueAppHooks.forEach((hook) => hook(app))
 }
+
+export const invokeCreateErrorHandler = once(
+  (
+    app: App,
+    createErrorHandler: (app: App) => App['config']['errorHandler']
+  ) => {
+    if (isFunction((app._component as any).onError)) {
+      return createErrorHandler(app)
+    }
+  }
+)

packages/uni-vue/src/index.ts

 import { App } from 'vue'
 
-import { isFunction } from '@vue/shared'
-import { invokeCreateVueAppHook } from '@dcloudio/uni-shared'
+import {
+  invokeCreateVueAppHook,
+  invokeCreateErrorHandler,
+} from '@dcloudio/uni-shared'
 
 import { applyOptions } from './componentOptions'
 import { set } from './componentInstance'
@@ -10,10 +12,8 @@ import { uniIdMixin } from './uni-id-mixin'
 
 export function initApp(app: App) {
   const appConfig = app._context.config
-  if (isFunction((app._component as any).onError)) {
-    appConfig.errorHandler = createErrorHandler(app)
-  }
 
+  appConfig.errorHandler = invokeCreateErrorHandler(app, createErrorHandler)
   initOptionMergeStrategies(appConfig.optionMergeStrategies)
 
   const globalProperties = appConfig.globalProperties