Add a 'previousRoute' property to the Router instance

[nathanchase]

What problem is this solving

I'd like to see a previousRoute property available on the Router instance.

This would be the value of where the router was previously - (undefined) if there is no such value.

This is an upstream request that came from needing this property on the Nuxt 3 router:
nuxt/nuxt#15661

Proposed solution

Add a 'previousRoute' property to the Router instance.

Describe alternatives you've considered

Currently, I have to create a global middleware to store the previous route in Pinia, like so:

export default defineNuxtRouteMiddleware(async (to, from) => {
  const globalsStore = useGlobalsStore();
  if (from.name) {
    globalsStore.previousRoute = from.name.toString();
  }
});

[posva]

This could be useful although it can already be added with a router guard:

router.beforeEach((to, from) => {
  to.meta.from = to
})

So the question would be if there are enough common use cases for this to be a default feature in router. FYI, this has been requested before, so it's worth checking issues in vuejs/router and vuejs/vue-router