Function addClass

lib/web/CodeMirror/src/util/dom.js:82–85

(node, cls)

}

export function addClass(node, cls) {
  let current = node.className
  if (!classTest(cls).test(current)) node.className += (current ? " " : "") + cls
}
export function joinClasses(a, b) {
  let as = a.split(" ")
  for (let i = 0; i < as.length; i++)