index.js
function arrayify(urls) {
  var tmp = Array.isArray(urls) ? urls : [urls];
  return tmp.filter(Boolean);
}
function arrayify(urls) {
  var tmp = Array.isArray(urls) ? urls : [urls];
  return tmp.filter(Boolean);
}
function arrayify ( urls ) { var tmp = Array . isArray ( urls ) ? urls : [ urls ] ; return tmp . filter ( Boolean ) ; }
Force a single string to an array if necessary
Force a single string to an array if necessary