We implemented our own. We don't need more than 10 different type of fields. So basically it will take couple of hours to create those base components to our requirements.

The main lession I learned in JS world is, when the requirement is small, better write it from scratch using code we find on net. Trying to integrate different incompatible libraries will just waste our time.

not vue, but I use ReactStrap + Bootstrap4 for that, and it works good.

Bootstrap 4 has some small rendering artifacts (like datetime inputs in inputGroups) but they are pretty fast about fixing them. (Though my input group example, the fix will be in the next release, beta1)

You should check out Vuelidate. It tries to avoid any extra fluff.

Disclaimer: I'm one of the authors