functionremoveItemAndRedundantWhiteSpace(list,item){varprev=item.prev;varnext=item.next;if(next!==null){if(next.data.type==='WhiteSpace'&&(prev===null||prev.data.type==='WhiteSpace')){list.remove(next);}}elseif(prev!==null&&prev.data.type==='WhiteSpace'){list.remove(prev);}list.remove(item);}module.exports=functioncompressBorder(node){node.children.each(function(node,item,list){if(node.type==='Identifier'&&node.name.toLowerCase()==='none'){if(list.head===list.tail){// replace `none` for zero when `none` is a single termitem.data={type:'Number',loc:node.loc,value:'0'};}else{removeItemAndRedundantWhiteSpace(list,item);}}});};