Function addTransitionClass

packages/runtime-dom/src/components/Transition.ts:321–327

(el: Element, cls: string)

}

export function addTransitionClass(el: Element, cls: string): void {
  cls.split(/\s+/).forEach(c => c && el.classList.add(c))
  ;(
    (el as ElementWithTransition)[vtcKey] ||
    ((el as ElementWithTransition)[vtcKey] = new Set())
  ).add(cls)
}

export function removeTransitionClass(el: Element, cls: string): void {
  cls.split(/\s+/).forEach(c => c && el.classList.remove(c))