[Vuejs]-Node Vue Typescript strange error on npm run serve, no helpful message

So it turns out there was some problem with a Dev dependency @types/vuelidate and the more recent versions of vue/cli or eslint or something, was not able to fully determine. So, I just removed that dev dependency then in my validation mixin, I just had to use @ts-nocheck.

Would have been nice for a more descriptive error message, but oh well.