Feature request: allow restore state after app mounted while SSR

When we doing SSR following this guide: https://ssr.vuejs.org/guide/hydration.html

We want to restore the state after app.$mount('#app', true), otherwise the state at local storage would lead different DOM render between server and client. This is because the state has been restored immediately when Vuex store created in plugins lifecycle, but the DOM rendered from server wouldn’t have these state, while app trying to mount, it cause error.

A proposal that we can have a ssrMode option pair with an action to trigger the restore:

const vuexPersist = new VuexPersistence<any, any>({
  ssrMode: true,
})

app.$mount('#app', true)

// restore state from persistence
store.dispatch('RESTORE_ACTION')

[curtisbelt]

I am also curious about an update, thank you!

[championswimmer]

this looks like a great proposal!

will try to implement this next week, till then if anyone can beat me to this with a PR then welcome!