LESS: Mixing variables into caller's scope

icecream-sandwich.less

@import "vars";
@import "mixins";

.vanilla-sandwich {
  .vanilla-config();
  .icecream-sandwich();
}

.neopolitan-sandwich {
  .neopolitan-config();
  .icecream-sandwich();
}

mixins.less

.icecream-sandwich() {
  background-color: @vars1;
  color: @vars2;
  border: 1x solid @vars3;
}

vars.less

@vanilla: #fff;
@strawberry: #F78BB2;
@chocolate: #61543C;

.vanilla-config() {
  @vars1: @vanilla;
  @vars2: @vanilla;
  @vars3: @chocolate;
}

.neopolitan-config() {
  @vars1: @strawberry;
  @vars2: @vanilla;
  @vars3: @chocolate;
}