app_vue2/plugins/route.ts

import {Plugin} from '@nuxt/types'

const routePlugin: Plugin = (ctx) => {
  if(ctx.app.router){
    ctx.app.router.beforeEach((to, from, next)=>{
      if(ctx.store.state.form.dirty){
        ctx.store.commit('form/setShowConfirmToLeave', true)
        ctx.store.commit('form/setGoAfterLeave', to)
      }else{
        next()
      }
    })

    ctx.app.router.afterEach(()=>{
      ctx.store.commit('form/setDirty', false)
    })
  }
}

export default routePlugin