How to use emulators with vuefire+vue (NOT NUXT) in local development?

[rublev]

app.use(VueFire, {
  firebaseApp,
  modules: [
    VueFireAuth({
      // Use auth emulator in dev mode
      auth: {
        useEmulator: 'http://localhost:9099',
      },
    }),
  ],
})

Does not do anything. Documentation is extremely unclear as well. Works fine in Nuxt. Cannot get my authentication to hit my local emulator to save my life. Spent days on this and I'm at my wits end!