Typescript: Fails on Vue interfaces

[bmulholland]

@nuxt/auth dev branch is failing CI after a yarn upgrade because of typescript errors: https://github.com/nuxt-community/auth-module/runs/1509932138

The project is using @nuxtjs/eslint-config-typescript and some of the lines it's failing on are directly recommended by Vue:

declare module 'vue/types/options' {
  interface ComponentOptions<V extends Vue> {
    myOption?: string
  }
}