Asset Pipeline for Android Web View development?

We’re building an android app with some functionality developed as native kotlin/android code and some as HTML/JS embedded in web views. We’re looking for a library that will help us manage and deploy our web code, something along the lines of the Asset Pipeline in Ruby on Rails.

The basic requirements are:

  • compiles HTML, CSS, and JS files from templates (e.g. HAML, SCSS) ready for static hosting.
  • versions these assets in production and keeps them in sync with the android app version.
  • has a dev environment with a local HTTPS webserver that watches and recompiles assets on file changes.

While there are a bunch of tools for taking care of a part of this, I haven’t found a turnkey library for this. Do any of you know of a library for this?