Remove space when LESS variable value to string -

below example less mixin code

.mixin(@option) {   .set(@options) when (@options = a){     @type: linear;   }    .set(@option);    background: -webkit-~'@{type}'-gradient(...); } 

the output

background: -webkit- linear -gradient(...); 

how can remove space around linear?

less not support inplace concatenation via variable interpolation in value statements. need temporary variable (+ auxiliary variable in particular case handle parens), e.g.:

@end-func: ~')';  div {     @func: ~'-webkit-@{type}-gradient(';     background: @func ... @end-func; }