Function NumberOf

packages/runtime-dom/src/components/Transition.ts:313–319

(val: unknown)

}

function NumberOf(val: unknown): number {
  const res = toNumber(val)
  if (__DEV__) {
    assertNumber(res, '<transition> explicit duration')
  }
  return res
}

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