Bootstrap 4 moved from Less to Sass for generating their CSS - since Tessera converted to Sass long ago (see issue #122 ), it's now possible to build bootstrap themes easily as part of the tessera build process.
Edit: since bootstrap 4 is likely to break most of the add-ins tessera uses, many of which are no longer maintained, https://github.com/twbs/bootstrap-sass could also be used to ease maintaining color themes.
Bootstrap 4 moved from Less to Sass for generating their CSS - since Tessera converted to Sass long ago (see issue #122 ), it's now possible to build bootstrap themes easily as part of the tessera build process.
See https://getbootstrap.com/docs/4.1/getting-started/theming/
Edit: since bootstrap 4 is likely to break most of the add-ins tessera uses, many of which are no longer maintained, https://github.com/twbs/bootstrap-sass could also be used to ease maintaining color themes.