Simple Less

Simple Less makes it easy to compile Less style sheets.

How to use it

Sample your_theme.libraries.yml

base:
  version: 1.0
  less:
    base:
      css/styles.less: { output: css/gen/styles.css }
  css:
    component:
      css/gen/styles.css: {}


Source: https://drupal.org/project/project_module/feed/all