Nuxt/packages/nuxt/src/app/components/nuxt-error-boundary.ts

import { defineComponent, onErrorCaptured, ref } from 'vue'
import { useNuxtApp } from '../nuxt'

export default defineComponent({
  name: 'NuxtErrorBoundary',
  inheritAttrs: false,
  emits: {
    error (_error: unknown) {
      return true
    },
  },
  setup (_props, { slots, emit }) {
    const error = ref<Error | null>(null)
    const nuxtApp = useNuxtApp()

    if (import.meta.client) {
      onErrorCaptured((err, target, info) => {
        if (!nuxtApp.isHydrating || !nuxtApp.payload.serverRendered) {
          emit('error', err)
          nuxtApp.hooks.callHook('vue:error', err, target, info)
          error.value = err
          return false
        }
      })
    }

    function clearError () {
      error.value = null
    }

    return () => error.value ? slots.error?.({ error, clearError }) : slots.default?.()
  },
})