gistfile1.md

Variadic argument support in LESS 1.3.0

.mixin (...) {        // matches 0-N arguments
.mixin () {           // matches exactly 0 arguments
.mixin (@a: 1) {      // matches 0-1 arguments
.mixin (@a: 1, ...) { // matches 0-N arguments
.mixin (@a, ...) {    // matches 1-N arguments

Furthermore:

.mixin (@a, @rest...) {
   // @rest is bound to arguments after @a
   // @arguments is bound to all arguments
}

Markdotto: You can do this.

.lol(@arg...){
  background: ~`"@{arg}".replace("]","").replace("[","")`;
}
.lol(hi,lol,rofl);

result: background: hi, lol, rofl;

Very useful reference, even from 2014.