Convert LESS to Stylus by parsing LESS sources and traversing resulting AST.

% npm install -g less2stylus

% less2stylus styles.less > styles.styl

Bootstrap 3.0 can be translated as-is.

• every mixin with no params or all params having default values will have corresponding class generated, so

  .some-mixin() {
    ...
  }
  

  results in

  some-mixin()
    ...
  
  .some-mixin
    some-mixin()
  

• call to a mixin with no params will result in an @extend of corresponding class, so

  body {
    .some-mixin()
  }
  

  results in

  body
    @extend .some-mixin
  

• @media directives which use variables to specify a condition on which rules apply will translate into an additional variable declaration which holds @media condition. This is because of Stylus limitation not to allow variables inside @media conditions.

  @media screen and (min-width: tablet) {
    ...
  }
  

  results in

  var213123edf25df1a = "screen and (min-width: " + tablet + ")"
  @media var213123edf25df1a
    ...
  

• if there are mixins which named translate, translate3d, scale, skew, rotate then they will be prefixed with mixin- in resulted Stylus sources. This is to prevent recursive mixin invokations.